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* [Bug libfortran/90374] Fortran 2018: Support d0.d, e0.d, es0.d, en0.d, g0.d and ew.d e0 edit descriptors for output
[not found] <bug-90374-4@http.gcc.gnu.org/bugzilla/>
@ 2019-08-02 19:10 ` jvdelisle at gcc dot gnu.org
2021-05-04 12:25 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 2+ messages in thread
From: jvdelisle at gcc dot gnu.org @ 2019-08-02 19:10 UTC (permalink / raw)
To: gcc-bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90374
Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |jvdelisle at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |jvdelisle at gcc dot gnu.org
--- Comment #1 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
If everyone agrees I will do this one. I should have some time in the next few
weeks assuming I get my development systems bcak online. They are in a
maintaenance state at the moment (ie changing some parts)
>From gcc-bugs-return-650141-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 02 20:44:11 2019
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/91333] New: [9/10 Regression] suboptimal register allocation for inline asm
Date: Fri, 02 Aug 2019 20:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91333
Bug ID: 91333
Summary: [9/10 Regression] suboptimal register allocation for
inline asm
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Keywords: ra
Severity: normal
Priority: P3
Component: rtl-optimization
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Reporter: glisse at gcc dot gnu.org
Target Milestone: ---
Target: x86_64-*-*
static double g(double x){
asm volatile("":"+x"(x));
return x;
}
double f(double a,double b){
return g(g(a)+g(b));
}
(using -O1, -O2 or -O3)
With gcc-8, I get the sensible
addsd %xmm1, %xmm0
With gcc-9, I get
movapd %xmm0, %xmm2
movapd %xmm1, %xmm0
movapd %xmm2, %xmm1
addsd %xmm1, %xmm0
For some reason gcc decided to swap the 2 numbers?
-mavx helps remove all the moves, but on this slightly larger example:
double h(double a,double b){
return f(f(a,a),f(b,b));
}
-mavx actually increases the number of moves, from 2 to 4... (and at -O1 gcc
does this strange thing where it stores a double in %rax, good thing that
disappears at -O2)
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/77712] [DR903] int() is incorrectly treated as a null pointer constant in C++11 and later
Date: Fri, 02 Aug 2019 20:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77712
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
The problem here is that parsing "int()" results in INTEGER_CST 0, created by
build_zero_init, and we have no way to tell that it's not a null pointer
constant anymore :(.
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Subject: [Bug c/91312] -Wconversion warning with += operator
Date: Fri, 02 Aug 2019 21:23:00 -0000
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--- Comment #4 from Kostas Sotiropoulos <kosotiro at yahoo dot gr> ---
Any comments on my questions?
>From gcc-bugs-return-650144-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 02 21:26:19 2019
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Subject: [Bug c/91312] -Wconversion warning with += operator
Date: Fri, 02 Aug 2019 21:26:00 -0000
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--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Kostas Sotiropoulos from comment #4)
> Any comments on my questions?
Yes go read the c standard about prompting to int here.
>From gcc-bugs-return-650145-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 02 21:29:35 2019
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/90297] gcc/fortran/resolve.c: 2 * possibly redundant code ?
Date: Fri, 02 Aug 2019 21:29:00 -0000
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--- Comment #4 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Fri Aug 2 21:28:58 2019
New Revision: 274031
URL: https://gcc.gnu.org/viewcvs?rev=274031&root=gcc&view=rev
Log:
2019-08-02 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/90297
* match.c (gfc_match_equivalence): Check that EQUIVALENCE is followed
by '('.
2019-08-02 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/90297
* gfortran.dg/equiv_10.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/equiv_10.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/match.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-650146-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 02 21:33:10 2019
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Subject: [Bug c++/91334] New: [10 Regression] internal compiler error: Segmentation fault
Date: Fri, 02 Aug 2019 21:33:00 -0000
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Bug ID: 91334
Summary: [10 Regression] internal compiler error: Segmentation
fault
Product: gcc
Version: 10.0
Status: UNCONFIRMED
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CC: mliska at suse dot cz
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On x86-64, when building 483.xalancbmk in SPEC CPU 2006, r273791 caused:
$ g++ -m32 -Ofast -funroll-loops -msse2 -mfpmath=sse -ffast-math
-march=skylake-avx512 -flto ...
ElemNumber.cpp: In member function 'getCountString':
ElemNumber.cpp:458:1: internal compiler error: Segmentation fault
458 | ElemNumber::getCountString(
| ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
lto-wrapper: fatal error: g++ returned 1 exit status
compilation terminated.
/usr/local/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
specmake: *** [Xalan] Error 1
>From gcc-bugs-return-650147-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 02 21:40:45 2019
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/90986] Wrong error message with variables named "EQUIVALENCE*"
Date: Fri, 02 Aug 2019 21:40:00 -0000
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|UNCONFIRMED |RESOLVED
CC| |kargl at gcc dot gnu.org
Resolution|--- |FIXED
Assignee|unassigned at gcc dot gnu.org |kargl at gcc dot gnu.org
Target Milestone|--- |10.0
--- Comment #1 from kargl at gcc dot gnu.org ---
Fixed on trunk with r274031.
I had the wrong PR number in the ChangeLog.
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Subject: [Bug fortran/90297] gcc/fortran/resolve.c: 2 * possibly redundant code ?
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
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--- Comment #5 from kargl at gcc dot gnu.org ---
(In reply to kargl from comment #4)
> Author: kargl
> Date: Fri Aug 2 21:28:58 2019
> New Revision: 274031
>
> URL: https://gcc.gnu.org/viewcvs?rev=274031&root=gcc&view=rev
> Log:
> 2019-08-02 Steven G. Kargl <kargl@gcc.gnu.org>
>
> PR fortran/90297
> * match.c (gfc_match_equivalence): Check that EQUIVALENCE is followed
> by '('.
>
> 2019-08-02 Steven G. Kargl <kargl@gcc.gnu.org>
>
> PR fortran/90297
> * gfortran.dg/equiv_10.f90: New test.
>
> Added:
> trunk/gcc/testsuite/gfortran.dg/equiv_10.f90
> Modified:
> trunk/gcc/fortran/ChangeLog
> trunk/gcc/fortran/match.c
> trunk/gcc/testsuite/ChangeLog
Whoops. Wrong PR number in ChangeLog. Correct PR is fortran/90986.
>From gcc-bugs-return-650149-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 02 23:49:25 2019
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Subject: [Bug fortran/90985] Wrong error message with variables named "DATA*"
Date: Fri, 02 Aug 2019 23:49:00 -0000
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--- Comment #2 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Fri Aug 2 23:48:36 2019
New Revision: 274033
URL: https://gcc.gnu.org/viewcvs?rev=274033&root=gcc&view=rev
Log:
2019-08-02 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/90985
* decl.c (gfc_match_data): In free-form code, DATA be followed by
whitespace.
2019-08-02 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/90985
* gfortran.dg/pr90985.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/pr90985.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/decl.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-650150-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 02 23:52:24 2019
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Subject: [Bug fortran/90985] Wrong error message with variables named "DATA*"
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
Priority|P3 |P4
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CC| |kargl at gcc dot gnu.org
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--- Comment #3 from kargl at gcc dot gnu.org ---
Fixed on trunk.
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Subject: [Bug fortran/89943] Submodule functions are not allowed to have C binding
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kargl at gcc dot gnu.org changed:
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--- Comment #2 from kargl at gcc dot gnu.org ---
I have a patch.
>From gcc-bugs-return-650152-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 03 03:20:32 2019
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From: "zeratul976 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91335] New: False positive "unused variable" warning with variable initialized in 'if' condition
Date: Sat, 03 Aug 2019 03:20:00 -0000
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Bug ID: 91335
Summary: False positive "unused variable" warning with variable
initialized in 'if' condition
Product: gcc
Version: unknown
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In the following code:
int* foo();
int main() {
if (int* f = foo()) {
return 1;
}
return 0;
}
GCC (tested version 9.1.0) issues the following warning with -Wall:
test.cpp: In function ‘int main()’:
test.cpp:4:12: warning: unused variable ‘f’ [-Wunused-variable]
4 | if (int* f = foo()) {
| ^
I consider this a false positive because testing the variable's value in the
if-condition constitutes a use.
The language does not syntactically permit omitting the variable name here:
int main() {
if (int* = foo()) { // error: expected unqualified-id before '=' token
return 1;
}
return 0;
}
As a result, the only way to fix the warning is to lift the variable into the
outer scope, which can be undesirable from a code style point of view:
int* foo();
int main() {
int* f = foo();
if (f) {
return 1;
}
// variable 'f' still in scope here, when I don't want it to be
return 0;
}
>From gcc-bugs-return-650153-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 03 03:22:33 2019
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Subject: [Bug c++/91335] False positive "unused variable" warning with variable initialized in 'if' condition
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--- Comment #1 from Nathan Ridge <zeratul976 at hotmail dot com> ---
(In reply to Nathan Ridge from comment #0)
> As a result, the only way to fix the warning is to lift the variable into
> the outer scope, which can be undesirable from a code style point of view:
(Well, or I could add a "(void) f;" statement in the if body. Equally
undesirable.)
>From gcc-bugs-return-650154-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 03 05:49:19 2019
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Subject: [Bug c++/64372] [DR1560] Gratuitous lvalue-to-rvalue conversion in conditional-expression with throw-expression operand
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Justin Bassett <jbassett271 at gmail dot com> changed:
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--- Comment #13 from Justin Bassett <jbassett271 at gmail dot com> ---
Reconfirmed with GCC 9.1, from this Stack Overflow question:
https://stackoverflow.com/questions/57315054/unable-to-use-ternary-operator-to-conditionally-assign-istream/57315456
Some variants:
https://godbolt.org/z/gcnglB (GCC 9.1)
class Foo
{
public:
Foo(int& i)
: i{i > 0 ? i : throw "invalid"}
{}
private:
int& i;
};
Error:
<source>: In constructor 'Foo::Foo(int&)':
<source>:6:40: error: cannot bind non-const lvalue reference of type 'int&' to
an rvalue of type 'int'
6 | : i{i > 0 ? i : throw "invalid"}
| ^
This one changed from GCC 8.3 and GCC 9.1, which I'm guessing is due to the
work by Jason Merrill:
https://godbolt.org/z/DfKGg4
struct no_copy {
no_copy(no_copy const&) = delete;
bool valid() const;
};
class Foo
{
public:
Foo(no_copy& it)
: it{it.valid() ? it : throw "invalid"}
{}
private:
no_copy& it;
};
GCC 9.1:
<source>: In constructor 'Foo::Foo(no_copy&)':
<source>:11:47: error: cannot bind non-const lvalue reference of type
'no_copy&' to an rvalue of type 'no_copy'
11 | : it{it.valid() ? it : throw "invalid"}
| ^
GCC 8.3:
<source>: In constructor 'Foo::Foo(no_copy&)':
<source>:11:38: error: use of deleted function 'no_copy::no_copy(const
no_copy&)'
: it{it.valid() ? it : throw "invalid"}
^~~~~~~~~
<source>:2:5: note: declared here
no_copy(no_copy const&) = delete;
^~~~~~~
<source>:11:47: error: invalid initialization of non-const reference of type
'no_copy&' from an rvalue of type '<brace-enclosed initializer list>'
: it{it.valid() ? it : throw "invalid"}
^
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91334] [10 Regression] internal compiler error: Segmentation fault
Date: Sat, 03 Aug 2019 07:38:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-08-03
CC| |marxin at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Mine.
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Subject: [Bug c++/91334] [10 Regression] ICE in propagate_necessity at gcc/tree-ssa-dce.c:813 since r273791
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91334
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Known to work| |9.1.0
Target Milestone|--- |10.0
Summary|[10 Regression] internal |[10 Regression] ICE in
|compiler error: |propagate_necessity at
|Segmentation fault |gcc/tree-ssa-dce.c:813
| |since r273791
Known to fail| |10.0
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Reduced test-case:
$ cat ice.cpp
struct Base {
virtual ~Base();
};
struct Derived : Base {
void operator delete(void *) {}
};
void foo() { Derived d1; }
$ gcc -O3 -c -fno-ipa-pure-const -fipa-sra -fno-early-inlining ice.cpp
during GIMPLE pass: cddce
ice.cpp: In destructor ‘virtual Derived::~Derived()’:
ice.cpp:7:26: internal compiler error: in gimple_call_arg, at gimple.h:3190
7 | void foo() { Derived d1; }
| ^
0x13198ce gimple_call_arg
/home/marxin/Programming/gcc/gcc/gimple.h:3190
0x1319924 gimple_call_arg
/home/marxin/Programming/gcc/gcc/gimple.h:3198
0x131c76a propagate_necessity
/home/marxin/Programming/gcc/gcc/tree-ssa-dce.c:813
0x131f0b1 perform_tree_ssa_dce
/home/marxin/Programming/gcc/gcc/tree-ssa-dce.c:1663
0x131f1f3 tree_ssa_cd_dce
/home/marxin/Programming/gcc/gcc/tree-ssa-dce.c:1707
0x131f360 execute
/home/marxin/Programming/gcc/gcc/tree-ssa-dce.c:1772
I've got a patch candidate for it.
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From: "hahnjo at hahnjo dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91336] New: Missing -Wcast-qual?
Date: Sat, 03 Aug 2019 09:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91336
Bug ID: 91336
Summary: Missing -Wcast-qual?
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hahnjo at hahnjo dot de
Target Milestone: ---
Created attachment 46665
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46665&action=edit
Test case.
If I compile the attached example with
> $ g++ -c -Wall -Wextra -Wcast-qual cast-qual.cpp
I get many (correct) errors, but only one warning enabled by -Wcast-qual.
I think GCC is correct to flag the following:
> static const char cvar[4] = { 0 };
> [...]
> const char **p2 = (const char **)&cvar;
> *p2 = "bla";
output:
> cast-qual.cpp:20:36: warning: cast from type ‘const char (*)[4]’ to type ‘const char**’ casts away qualifiers [-Wcast-qual]
In this case, cvar is an array and is only cast to a pointer, so you should not
assign to *p2. Instead the correct cast is
> const char * const *p3 = (const char * const *)&cvar;
and the assignment *p3 = "bla" leads to
> cast-qual.cpp:27:6: error: assignment of read-only location ‘* p3’
If the code instead defines
> static char var[4] = { 0 };
then the cast
> char **p2 = (char **)&var;
does not lead to a warning while assigning to *p2 should still not work.
Similarly to above, I think the correct cast should be
> char * const *p3 = (char * const *)&var;
Do you agree?
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/91325] [ASAN] ASAN hangs at throw if called via dlopen
Date: Sat, 03 Aug 2019 10:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91325
--- Comment #4 from Jens Seidel <jensseidel at users dot sf.net> ---
LLVM was affected by the same bug. They fixed it. But why is it not
reproducable to everyone?
https://bugs.llvm.org/show_bug.cgi?id=39641
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Subject: [Bug c++/91336] Missing -Wcast-qual?
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--- Comment #1 from Jonas Hahnfeld <hahnjo at hahnjo dot de> ---
Created attachment 46666
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46666&action=edit
Small test case.
I'm attaching another small test case that shows 3 casts, GCC only warns about
the first one. Interestingly the latest Intel Compiler also warns about the
second one.
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From: "chinoune.mehdi at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/91337] New: gfortran skips an if statement with some mathematical optimisations with complex numbers.
Date: Sat, 03 Aug 2019 11:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91337
Bug ID: 91337
Summary: gfortran skips an if statement with some mathematical
optimisations with complex numbers.
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: chinoune.mehdi at hotmail dot com
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I have encountered some underflows/overflows in my code compiled with -Ofast,
and after investigations it seems like the complex abs gives zero with small
numbers. So I added a workaround. but it didn't work:
module m
implicit none
!
integer, parameter :: sp = selected_real_kind(6)
real(sp), parameter :: tiny_sp = tiny(1._sp), sqrt_tiny = sqrt( tiny_sp )
!
contains
subroutine sub(z,y)
complex(sp), intent(in) :: z
real(sp), intent(out) :: y
real(sp) :: az
!
az = abs(z)
if( az<tiny_sp ) az = abs(z/sqrt_tiny)*sqrt_tiny
! if( az<tiny_sp .or. az==0._sp ) az = abs(z/sqrt_tiny)*sqrt_tiny
print*, az<tiny_sp, az
y = 1._sp/az
!
end subroutine sub
end module m
!
program bug_skip_if
use m
implicit none
complex(sp) :: z
real(sp) :: y
!
z = (1.e-19_sp,0._sp)
call sub(z,y)
print*,"y = ",y
!
end program bug_skip_if
gfortran-9 -O1 -funsafe-math-optimizations -ffinite-math-only bug_skip_if.f90
-o test.x
./test.x
T 0.00000000
y = Infinity
I tried to write an equivalent c code, but it gives the right result:
#include <stdio.h>
#include <float.h>
#include <math.h>
#include <complex.h>
void foo(float complex z, float *y){
float const sqrt_flt_min = sqrtf( FLT_MIN );
float az;
az = cabsf(z);
if( az<FLT_MIN ) az = cabsf(z/sqrt_flt_min) * sqrt_flt_min;
printf("az = %.8e\n",az);
*y = 1.f/az;
}
int main(){
float complex z;
float y;
z = 1.e-19f + 0.*I;
foo(z,&y);
printf("y = %.7e\n",y);
return 0;
}
gcc-9 -O1 -funsafe-math-optimizations -ffinite-math-only cbug_skip_if.c -lm -o
test.x
./test.x
az = 9.99999968e-20
y = 1.0000000e+19
Q : Why does gfortran skip the if statement?
OS : Linux Ubuntu 18.04 x86_64
Compilers : gfortran 9.1.0 and 8.3.0
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Subject: [Bug fortran/90786] [7/8 Regression] ICE on procedure pointer assignment to function with class pointer result
Date: Sat, 03 Aug 2019 11:51:00 -0000
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--- Comment #13 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Sat Aug 3 11:50:39 2019
New Revision: 274038
URL: https://gcc.gnu.org/viewcvs?rev=274038&root=gcc&view=rev
Log:
2019-08-03 Thomas Koenig <tkoenig@gcc.gnu.org>
Paul Thomas <pault@gcc.gnu.org>
Backport from trunk
PR fortran/90786
PR fortran/90813
* trans-expr.c (pointer_assignment_is_proc_pointer) Remove as
it is very simple and only called from one place.
(gfc_trans_pointer_assignment): Rename non_proc_pointer_assign
as non_proc_ptr_assign. Assign to it directly, rather than call
to above, deleted function and use gfc_expr_attr instead of
only checking the reference chain.
* trans-decl.c (sym_identifier): New function.
(mangled_identifier): New function, doing most of the work
of gfc_sym_mangled_identifier.
(gfc_sym_mangled_identifier): Use mangled_identifier. Add mangled
identifier to global symbol table.
(get_proc_pointer_decl): Use backend decl from global identifier
if present.
2019-08-03 Thomas Koenig <tkoenig@gcc.gnu.org>
Paul Thomas <pault@gcc.gnu.org>
Backport from trunk
PR fortran/90786
PR fortran/90813
* gfortran.dg/proc_ptr_51.f90: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/proc_ptr_51.f90
Modified:
branches/gcc-7-branch/gcc/fortran/ChangeLog
branches/gcc-7-branch/gcc/fortran/trans-decl.c
branches/gcc-7-branch/gcc/fortran/trans-expr.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/90813] [10 regression] gfortran.dg/proc_ptr_51.f90 fails (SIGSEGV) after 272084
Date: Sat, 03 Aug 2019 11:51:00 -0000
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--- Comment #37 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Sat Aug 3 11:50:39 2019
New Revision: 274038
URL: https://gcc.gnu.org/viewcvs?rev=274038&root=gcc&view=rev
Log:
2019-08-03 Thomas Koenig <tkoenig@gcc.gnu.org>
Paul Thomas <pault@gcc.gnu.org>
Backport from trunk
PR fortran/90786
PR fortran/90813
* trans-expr.c (pointer_assignment_is_proc_pointer) Remove as
it is very simple and only called from one place.
(gfc_trans_pointer_assignment): Rename non_proc_pointer_assign
as non_proc_ptr_assign. Assign to it directly, rather than call
to above, deleted function and use gfc_expr_attr instead of
only checking the reference chain.
* trans-decl.c (sym_identifier): New function.
(mangled_identifier): New function, doing most of the work
of gfc_sym_mangled_identifier.
(gfc_sym_mangled_identifier): Use mangled_identifier. Add mangled
identifier to global symbol table.
(get_proc_pointer_decl): Use backend decl from global identifier
if present.
2019-08-03 Thomas Koenig <tkoenig@gcc.gnu.org>
Paul Thomas <pault@gcc.gnu.org>
Backport from trunk
PR fortran/90786
PR fortran/90813
* gfortran.dg/proc_ptr_51.f90: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/proc_ptr_51.f90
Modified:
branches/gcc-7-branch/gcc/fortran/ChangeLog
branches/gcc-7-branch/gcc/fortran/trans-decl.c
branches/gcc-7-branch/gcc/fortran/trans-expr.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/90786] [7/8 Regression] ICE on procedure pointer assignment to function with class pointer result
Date: Sat, 03 Aug 2019 11:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90786
Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #14 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Fixed on all open branches, closing.
>From gcc-bugs-return-650164-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 03 12:54:53 2019
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From: "btzy1996 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91230] [9/10 Regression] Template function containing lambda expression that has auto parameter and uses __PRETTY_FUNCTION__ does not compile
Date: Sat, 03 Aug 2019 12:54:00 -0000
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--- Comment #6 from Bernard Teo <btzy1996 at gmail dot com> ---
Thank you. I've tried and it works on trunk.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/91326] VRP does not handle array value range
Date: Sat, 03 Aug 2019 15:05:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Related to https://gcc.gnu.org/ml/gcc-patches/2017-04/msg01559.html (which
hasn't been applied).
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/91337] gfortran skips an if statement with some mathematical optimisations with complex numbers.
Date: Sat, 03 Aug 2019 15:15:00 -0000
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kargl at gcc dot gnu.org changed:
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/91337] gfortran skips an if statement with some mathematical optimisations with complex numbers.
Date: Sat, 03 Aug 2019 15:15:00 -0000
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kargl at gcc dot gnu.org changed:
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--- Comment #1 from kargl at gcc dot gnu.org ---
(In reply to Chinoune from comment #0)
> I have encountered some underflows/overflows in my code compiled with
> -Ofast, and after investigations it seems like the complex abs gives zero
> with small numbers. So I added a workaround. but it didn't work:
>
(snip)
>
> gfortran-9 -O1 -funsafe-math-optimizations -ffinite-math-only
> bug_skip_if.f90 -o test.x
> ./test.x
(snip)
>
> Q : Why does gfortran skip the if statement?
What happens if you don't use options that allow
a compiler to violate the standard?
'-Ofast'
Disregard strict standards compliance. '-Ofast' enables all '-O3'
optimizations. It also enables optimizations that are not valid
for all standard-compliant programs. It turns on '-ffast-math' and
the Fortran-specific '-fstack-arrays', unless
'-fmax-stack-var-size' is specified, and '-fno-protect-parens'.
'-ffast-math'
Sets the options '-fno-math-errno', '-funsafe-math-optimizations',
'-ffinite-math-only', '-fno-rounding-math', '-fno-signaling-nans',
'-fcx-limited-range' and '-fexcess-precision=fast'.
This option causes the preprocessor macro '__FAST_MATH__' to be
defined.
This option is not turned on by any '-O' option besides '-Ofast'
since it can result in incorrect output for programs that depend on
an exact implementation of IEEE or ISO rules/specifications for
math functions. It may, however, yield faster code for programs
that do not require the guarantees of these specifications.
'-funsafe-math-optimizations'
Allow optimizations for floating-point arithmetic that (a) assume
that arguments and results are valid and (b) may violate IEEE or
ANSI standards. When used at link time, it may include libraries
or startup files that change the default FPU control word or other
similar optimizations.
This option is not turned on by any '-O' option since it can result
in incorrect output for programs that depend on an exact
implementation of IEEE or ISO rules/specifications for math
functions
>From gcc-bugs-return-650168-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 03 15:25:09 2019
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Subject: [Bug middle-end/90597] [9/10 Regression] FAIL: gcc.dg/attr-vector_size.c (internal compiler error)
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--- Comment #1 from John David Anglin <danglin at gcc dot gnu.org> ---
Created attachment 46667
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46667&action=edit
Preproccessed source
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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/91337] gfortran skips an if statement with some mathematical optimisations with complex numbers.
Date: Sat, 03 Aug 2019 15:28:00 -0000
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--- Comment #2 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Sat, Aug 03, 2019 at 03:14:57PM +0000, kargl at gcc dot gnu.org wrote:
> --- Comment #1 from kargl at gcc dot gnu.org ---
> (In reply to Chinoune from comment #0)
> > I have encountered some underflows/overflows in my code compiled with
> > -Ofast, and after investigations it seems like the complex abs gives zero
> > with small numbers. So I added a workaround. but it didn't work:
> >
>
> (snip)
>
> >
> > gfortran-9 -O1 -funsafe-math-optimizations -ffinite-math-only
> > bug_skip_if.f90 -o test.x
> > ./test.x
>
> (snip)
>
> >
> > Q : Why does gfortran skip the if statement?
>
> What happens if you don't use options that allow
> a compiler to violate the standard?
>
BTW, with the posted code, I cannot reproduce your results
on either i586-*-freebsd or x86_64-*-freebsd.
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Subject: [Bug middle-end/90597] [9/10 Regression] FAIL: gcc.dg/attr-vector_size.c (internal compiler error)
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--- Comment #2 from John David Anglin <danglin at gcc dot gnu.org> ---
/* However, if the underlying mode requires a bigger alignment than
what the target hook provides, we cannot use the mode. For now,
simply reject that case. */
gcc_assert (TYPE_ALIGN (type)
>= GET_MODE_ALIGNMENT (TYPE_MODE (type)));
Breakpoint 1, layout_type (type=0x800003fffde98930)
at ../../gcc/gcc/stor-layout.c:2401
2401 gcc_assert (TYPE_ALIGN (type)
(gdb) p debug_tree(type)
<vector_type 800003fffde98930
type <integer_type 800003fffddd33f0 char public string-flag QI
size <integer_cst 800003fffddc5a08 constant 8>
unit-size <integer_cst 800003fffddc5a20 constant 1>
align:8 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
800003fffddd33f0 precision:8 min <integer_cst 800003fffddc5a50 -128> max
<integer_cst 800003fffddc5a80 127>
pointer_to_this <pointer_type 800003fffdde13f0>>
BLK
size <integer_cst 800003fffdeb7378 type <integer_type 800003fffddd30a8
bitsizetype> constant 1073741824>
unit-size <integer_cst 800003fffdeb7348 type <integer_type 800003fffddd3000
sizetype> constant 134217728>
align:32768 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
800003fffde98930 nunits:134217728>
$1 = void
(gdb) bt
#0 layout_type (type=0x800003fffde98930) at ../../gcc/gcc/stor-layout.c:2401
#1 0x4000000000bee0ac in make_vector_type (innertype=0x7e000000, nunits=...,
mode=E_VOIDmode) at ../../gcc/gcc/tree.c:10154
#2 0x4000000000bee354 in build_vector_type (innertype=<optimized out>,
nunits=...) at ../../gcc/gcc/tree.c:11074
#3 0x400000000042c750 in handle_vector_size_attribute (
node=0x800003fffde98930, name=<optimized out>, args=<optimized out>,
flags=<optimized out>, no_add_attrs=<optimized out>)
at ../../gcc/gcc/poly-int.h:671
#4 0x400000000033ae40 in decl_attributes (node=0x0,
attributes=<optimized out>, flags=<optimized out>, last_decl=0x0)
at ../../gcc/gcc/attribs.c:718
#5 0x4000000000345bcc in c_decl_attributes (node=0x800003fffde98930,
attributes=0x7e000000, flags=0) at ../../gcc/gcc/c/c-decl.c:4837
#6 0x4000000000358fac in start_decl (declarator=0x800003fffddd33f0,
declspecs=0x800003fffddc5a20, initialized=<optimized out>,
attributes=<optimized out>) at ../../gcc/gcc/c/c-decl.c:4976
#7 0x40000000003afed8 in c_parser_declaration_or_fndef (
parser=0x800003fffdec5000, fndef_ok=false,
static_assert_ok=<optimized out>, empty_ok=<optimized out>,
nested=<optimized out>, start_attr_ok=<optimized out>,
objc_foreach_object_declaration=<optimized out>,
omp_declare_simd_clauses=..., oacc_routine_data=<optimized out>,
---Type <return> to continue, or q <return> to quit---
fallthru_attr_p=<optimized out>) at ../../gcc/gcc/c/c-parser.c:2154
#8 0x40000000003b9388 in c_parser_external_declaration (
parser=0x800003fffde98930) at ../../gcc/gcc/c/c-parser.c:1653
#9 0x40000000003ba170 in c_parser_translation_unit (parser=<optimized out>)
at ../../gcc/gcc/c/c-parser.c:1534
#10 c_parse_file () at ../../gcc/gcc/c/c-parser.c:19871
#11 0x4000000000412274 in c_common_parse_file ()
at ../../gcc/gcc/c-family/c-opts.c:1160
#12 0x4000000000927c44 in compile_file () at ../../gcc/gcc/toplev.c:456
#13 0x0000000000000000 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
>From gcc-bugs-return-650171-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 03 15:50:12 2019
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Subject: [Bug middle-end/90597] [9/10 Regression] FAIL: gcc.dg/attr-vector_size.c (internal compiler error)
Date: Sat, 03 Aug 2019 15:50:00 -0000
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John David Anglin <danglin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2019-8-3
--- Comment #3 from John David Anglin <danglin at gcc dot gnu.org> ---
Probably, this is triggered because alignment of type is set to
MAX_OFILE_ALIGNMENT.
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Subject: [Bug c++/91338] New: Implement P1161R3: Deprecate a[b,c]
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Bug ID: 91338
Summary: Implement P1161R3: Deprecate a[b,c]
Product: gcc
Version: 10.0
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As per <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1161r3.html>.
>From gcc-bugs-return-650173-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 03 17:14:11 2019
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Subject: [Bug c++/91338] Implement P1161R3: Deprecate a[b,c]
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-08-03
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Ever confirmed|0 |1
>From gcc-bugs-return-650174-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 03 18:30:57 2019
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Subject: [Bug fortran/91337] gfortran skips an if statement with some mathematical optimisations with complex numbers.
Date: Sat, 03 Aug 2019 18:30:00 -0000
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Chinoune <chinoune.mehdi at hotmail dot com> changed:
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--- Comment #3 from Chinoune <chinoune.mehdi at hotmail dot com> ---
Sorry, It wasn't a bug. the compiler is not skipping the if statement.
-fassociative-math : Allow re-association of operands in series of
floating-point operations. This violates the ISO C and C++ language standard by
possibly changing computation result. NOTE: re-ordering may change the sign of
zero as well as ignore NaNs and inhibit or create underflow or overflow (and
thus cannot be used on code
that relies on rounding behavior like (x + 2**52) - 2**52. May also reorder
floating-point comparisons and thus may not be used when ordered comparisons
are required.
-fassociative-math is enabled by -funsafe-math-optimizations .
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Subject: [Bug bootstrap/87030] GCC fails to build with Xcode 10, attempting an impossible multilib build
Date: Sat, 03 Aug 2019 20:16:00 -0000
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--- Comment #22 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sat Aug 3 20:16:22 2019
New Revision: 274049
URL: https://gcc.gnu.org/viewcvs?rev=274049&root=gcc&view=rev
Log:
Darwin, backport fix for PR87030
273746 , 273749, 273768 [Darwin] Fix PR87030 and tidy config fragments.
This is about 32/64b host and multilib support across the range of Darwin
systems.
Prior to Darwin8 (OS X 10.4), the toolchains support only PowerPC and only 32b.
On Darwin8 it is possible to target a 64b multilib, but with support limited
to a few of the main libraries on the system (not a recommended configuration).
>From Darwin9 to Darwin17 (OSX 10.5 to 10.13) it is possible to have either
32 or 64b hosted toolchains, with support for a 64 or 32b multilib
respectively.
On Darwin9 the kernel is 32b, but with support for 64b executables, so it's
conventional to build a 32b host toolchain supporting a 64b multilib. However
this is not enforced (merely a convention).
There is also some platform hardware supporting Darwin10/11 which is only 32b
and for which the same situation applies. However, from Darwin10 to Darwin17,
the majority of platform hardware supports a 64b kernel and it's conventional
to build a 64b host toolchain with support for a 32b multilib.
On/from Darwin18 (OS X 10.14), the development headers (in the SDK) no longer
expose the interfaces for the 32b multilib support (although sufficient runtime
support remains installed that the testsuite can be run for a 32b multilib).
The PR is raised against this latter situation since the absence of exposed
interfaces causes a 'default' bootstrap fail regardless of the availability of
the runtimes. Given the number of permutations, I felt it warranted a general
solution, especially since the current scheme of target headers and t-make
fragments has become somewhat messy.
The changes here enforce the single 32b PowerPC multilib for Darwin < 8 and the
single X86 64b multilib for Darwin >= 18. This means that there is no longer
any need to configure Darwin18+ '--disable-multilib', but also that if you want
to use the ability to continue to test the compiler's 32b multilib there, you
need to make a configuration targeting an earlier OS version (and using the
SDK from that).
2019-08-03 Iain Sandoe <iain@sandoe.co.uk>
Backport from mainline
2019-07-24 Iain Sandoe <iain@sandoe.co.uk>
PR bootstrap/87030
* config/i386/darwin.h (REAL_LIBGCC_SPEC): Revert change from r273749.
PR bootstrap/87030
* config/i386/darwin.h (REAL_LIBGCC_SPEC): Move from here...
* config/i386/darwin32-biarch.h .. to here.
* config/i386/darwin64-biarch.h: Adjust comments.
* config/rs6000/darwin32-biarch.h: Likewise.
* config/rs6000/darwin64-biarch.h: Likewise.
* config.gcc: Missed commit from r273746
(*-*-darwin*): Don't include CPU t-darwin here.
(i[34567]86-*-darwin*): Adjust to use biarch files. Produce
an error message if i686-darwin configuration is attempted for
Darwin >= 18.
Backport from mainline
2019-07-23 Iain Sandoe <iain@sandoe.co.uk>
PR bootstrap/87030
* config.gcc (*-*-darwin*): Don't include CPU t-darwin here.
(i[34567]86-*-darwin*): Adjust to use biarch files. Produce
an error message if i686-darwin configuration is attempted for
Darwin >= 18.
(x86_64-*-darwin*): Switch to single multilib for Darwin >= 18.
(powerpc-*-darwin*): Use biarch files where needed.
(powerpc64-*-darwin*): Likewise.
* config/i386/darwin.h (REAL_LIBGCC_SPEC): Move to new biarch file.
(DARWIN_ARCH_SPEC, DARWIN_SUBARCH_SPEC): Revise for default single
arch case.
* config/i386/darwin32-biarch.h: New.
* config/i386/darwin64.h: Rename.
* gcc/config/i386/darwin64-biarch.h: To this.
* config/i386/t-darwin: Rename.
* gcc/config/i386/t-darwin32-biarch: To this.
* config/i386/t-darwin64: Rename.
* gcc/config/i386/t-darwin64-biarch: To this.
* config/rs6000/darwin32-biarch.h: New.
* config/rs6000/darwin64.h: Rename.
* config/rs6000/darwin64-biarch.h: To this.
(DARWIN_ARCH_SPEC, DARWIN_SUBARCH_SPEC): Revise for default single
arch case.
* config/rs6000/t-darwin8: Rename.
* config/rs6000/t-darwin32-biarch: To this.
* config/rs6000/t-darwin64 Rename.
* config/rs6000/t-darwin64-biarch: To this.
Added:
branches/gcc-9-branch/gcc/config/i386/darwin32-biarch.h
branches/gcc-9-branch/gcc/config/i386/darwin64-biarch.h
branches/gcc-9-branch/gcc/config/i386/t-darwin32-biarch
branches/gcc-9-branch/gcc/config/i386/t-darwin64-biarch
branches/gcc-9-branch/gcc/config/rs6000/darwin32-biarch.h
branches/gcc-9-branch/gcc/config/rs6000/darwin64-biarch.h
branches/gcc-9-branch/gcc/config/rs6000/t-darwin32-biarch
branches/gcc-9-branch/gcc/config/rs6000/t-darwin64-biarch
Removed:
branches/gcc-9-branch/gcc/config/i386/darwin64.h
branches/gcc-9-branch/gcc/config/i386/t-darwin
branches/gcc-9-branch/gcc/config/i386/t-darwin64
branches/gcc-9-branch/gcc/config/rs6000/darwin64.h
branches/gcc-9-branch/gcc/config/rs6000/t-darwin64
branches/gcc-9-branch/gcc/config/rs6000/t-darwin8
Modified:
branches/gcc-9-branch/gcc/ChangeLog
branches/gcc-9-branch/gcc/config.gcc
branches/gcc-9-branch/gcc/config/i386/darwin.h
branches/gcc-9-branch/gcc/config/rs6000/darwin.h
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Subject: [Bug bootstrap/87030] GCC fails to build with Xcode 10, attempting an impossible multilib build
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--- Comment #23 from Iain Sandoe <iains at gcc dot gnu.org> ---
fixed on trunk and for 9.2
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Subject: [Bug c++/91335] False positive "unused variable" warning with variable initialized in 'if' condition
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91335
--- Comment #2 from Nathan Ridge <zeratul976 at hotmail dot com> ---
I suppose a fair question here is, if I'm not going to use 'f', why don't I
just write:
if (foo()) {
return 1;
}
?
That would certainly work in this case. However, in the original code example
that motivated this report, foo() returned a class type which had a templated
conversion operator, and it's the result of that conversion operator
(instantiated with a pointer type) that I wanted to test. In such a case, I
need the declaration form to trigger invoking the conversion operator.
>From gcc-bugs-return-650178-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 01:54:47 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug d/91339] New: libphobos: ftbfs when the path contains '~'
Date: Sun, 04 Aug 2019 01:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91339
Bug ID: 91339
Summary: libphobos: ftbfs when the path contains '~'
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: d
Assignee: ibuclaw at gdcproject dot org
Reporter: syq at debian dot org
Target Milestone: ---
How to reproduce:
In Debian buster:
apt install \
libc6-dev-mips64-mipsr6el-cross \
libc6-dev-mipsn32-mipsr6el-cross \
libc6-dev-mipsr6el-cross \
libc6-mips64-mipsr6el-cross \
libc6-mipsn32-mipsr6el-cross \
libc6-mipsr6el-cross \
linux-libc-dev-mipsr6el-cross
download official gcc 9 from ftp of gcc
tar xf gcc-9.1.0.tar.xz
mv gcc-9.1.0 gcc-9.1.0~
cd gcc-9.1.0~
mkdir build && cd build
../configure --target mipsisa32r6el-linux-gnu --with-sysroot=/ --prefix=/usr
--libdir=/usr/lib --includedir=/usr/mipsisa32r6el-linux-gnu/include
--enable-libphobos --enable-languages=c,c++,d
make
Then libphobos will fail to configure:
configure:5360: checking If /root/gcc-9/gcc-9.1.0~/build/./gcc/gdc
-B/root/gcc-9/gcc-9.1.0~/build/./gcc/ -B/usr/mipsisa32r6el-linux-gnu/bin/
-B/usr/mipsisa32r6el-linux-gnu/lib/ -isystem
/usr/mipsisa32r6el-linux-gnu/include -isystem
/usr/mipsisa32r6el-linux-gnu/sys-include can compile D sources
configure:5370: /root/gcc-9/gcc-9.1.0~/build/./gcc/gdc
-B/root/gcc-9/gcc-9.1.0~/build/./gcc/ -B/usr/mipsisa32r6el-linux-gnu/bin/
-B/usr/mipsisa32r6el-linux-gnu/lib/ -isystem
/usr/mipsisa32r6el-linux-gnu/include -isystem
/usr/mipsisa32r6el-linux-gnu/sys-include -c -fno-moduleinfo -nostdinc -I
/root/gcc-9/gcc-9.1.0~/libphobos/libdruntime -g -O2 conftest.d >&5
d21: error: cannot find source code for runtime library file 'object.d'
d21: note: dmd might not be correctly installed. Run 'dmd -man' for
installation instructions.
d21: note: config file: not found
configure:5370: $? = 1
configure: failed program was:
| module mod;
|
|
| extern(C) int main() {
| return 0;
| }
configure:5374: result: no
configure:5376: error: can't compile D sources!
>From gcc-bugs-return-650179-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 01:55:41 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91338] Implement P1161R3: Deprecate a[b,c]
Date: Sun, 04 Aug 2019 01:55:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00200.html
>From gcc-bugs-return-650180-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 03:52:08 2019
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From: "a-yee at u dot northwestern.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/91340] New: Missing AVX and AVX512 Intrinsics: Zero-Extension
Date: Sun, 04 Aug 2019 03:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91340
Bug ID: 91340
Summary: Missing AVX and AVX512 Intrinsics: Zero-Extension
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
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All the zero-extension intrinsics are missing: https://godbolt.org/z/JV8I51
#include <immintrin.h>
int main()
{
// 128 -> 256
_mm256_zextps128_ps256(_mm_setzero_ps());
_mm256_zextpd128_pd256(_mm_setzero_pd());
_mm256_zextsi128_si256(_mm_setzero_si128());
// 128 -> 256
_mm512_zextps128_ps512(_mm_setzero_ps());
_mm512_zextpd128_pd512(_mm_setzero_pd());
_mm512_zextsi128_si512(_mm_setzero_si128());
// 256 -> 512
_mm512_zextps256_ps512(_mm256_setzero_ps());
_mm512_zextpd256_pd512(_mm256_setzero_pd());
_mm512_zextsi256_si512(_mm256_setzero_si256());
}
>From gcc-bugs-return-650181-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 04:00:37 2019
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From: "a-yee at u dot northwestern.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/91341] New: Missing AVX Intrinsics: load/store u2
Date: Sun, 04 Aug 2019 04:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91341
Bug ID: 91341
Summary: Missing AVX Intrinsics: load/store u2
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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The following intrinsics are missing:
- _mm256_loadu2_m128()
- _mm256_storeu2_m128()
- _mm256_loadu2_m128d()
- _mm256_storeu2_m128d()
- _mm256_loadu2_m128i()
- _mm256_storeu2_m128i()
https://godbolt.org/z/1jj_-e
>From gcc-bugs-return-650182-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 04:15:03 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/91342] New: Incorrect parameter type for AVX512 streaming intrinsics.
Date: Sun, 04 Aug 2019 04:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91342
Bug ID: 91342
Summary: Incorrect parameter type for AVX512 streaming
intrinsics.
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
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Priority: P3
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According to Intel's docs, all 4 of the AVX512 streaming instructions take void
pointers.
void _mm512_stream_ps (void* mem_addr, __m512 a)
void _mm512_stream_pd (void* mem_addr, __m512d a)
void _mm512_stream_si512 (void* mem_addr, __m512i a)
__m512i _mm512_stream_load_si512 (void const* mem_addr)
But GCC's implementation takes typed pointers.
https://godbolt.org/z/Dkte12
>From gcc-bugs-return-650183-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 04:37:45 2019
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Subject: [Bug c++/91343] New: Spurious strict-aliasing warning with template class inheritance.
Date: Sun, 04 Aug 2019 04:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91343
Bug ID: 91343
Summary: Spurious strict-aliasing warning with template class
inheritance.
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
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Priority: P3
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The following code leads to a strict-aliasing warning. But there is no aliasing
here.
https://godbolt.org/z/m2P_4-
Possibly Related or Duplicate:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89960
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81152
#include <iostream>
using namespace std;
struct Parent{
int data = 0;
};
template <typename Context>
class Child : public Parent{
public:
static int func(){
Child tp;
int x = tp.data;
return x;
}
};
template class Child<int>;
int main(){
}
<source>: In static member function 'static int Child<Context>::func()':
<source>:13:17: warning: dereferencing type-punned pointer will break
strict-aliasing rules [-Wstrict-aliasing]
13 | int x = tp.data;
| ^~
ASM generation compiler returned: 0
<source>: In static member function 'static int Child<Context>::func()':
<source>:13:17: warning: dereferencing type-punned pointer will break
strict-aliasing rules [-Wstrict-aliasing]
13 | int x = tp.data;
| ^~
>From gcc-bugs-return-650184-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 05:11:38 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91344] New: Function pointers in templates with restrict semantics may fail to compile.
Date: Sun, 04 Aug 2019 05:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91344
Bug ID: 91344
Summary: Function pointers in templates with restrict semantics
may fail to compile.
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
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The following code compiles on Clang, MSVC, and ICC. But it fails on GCC.
https://godbolt.org/z/zHq0qi
#include <iostream>
using namespace std;
#ifdef _WIN32
#define RESTRICT __restrict
#else
#define RESTRICT __restrict__
#endif
// Works
//template <typename type> using r_ptr = type *;
// Fails
template <typename type> using r_ptr = type *RESTRICT;
template <void (*fp)(r_ptr<int> ptr)>
void foo(){
int x = 123;
fp(&x);
}
void fp(r_ptr<int> ptr){
cout << ptr[0] << endl;
}
int main(int argc, char* argv[]) {
foo<fp>();
}
But on GCC, it gives:
<source>: In function 'int main(int, char**)':
<source>:30:13: error: no matching function for call to 'foo<fp>()'
30 | foo<fp>();
| ^
<source>:19:6: note: candidate: 'template<void (* fp)(r_ptr<int>)> void foo()'
19 | void foo(){
| ^~~
<source>:19:6: note: template argument deduction/substitution failed:
<source>:30:13: error: could not convert template argument 'fp' from
'void(r_ptr<int>)' {aka 'void(int*)'} to 'void (*)(int* __restrict__)'
30 | foo<fp>();
| ^
ASM generation compiler returned: 1
<source>: In function 'int main(int, char**)':
<source>:30:13: error: no matching function for call to 'foo<fp>()'
30 | foo<fp>();
| ^
<source>:19:6: note: candidate: 'template<void (* fp)(r_ptr<int>)> void foo()'
19 | void foo(){
| ^~~
<source>:19:6: note: template argument deduction/substitution failed:
<source>:30:13: error: could not convert template argument 'fp' from
'void(r_ptr<int>)' {aka 'void(int*)'} to 'void (*)(int* __restrict__)'
30 | foo<fp>();
|
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From: "a-yee at u dot northwestern.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91345] New: Typedef'ed restrict pointers may break compilation.
Date: Sun, 04 Aug 2019 06:10:00 -0000
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Bug ID: 91345
Summary: Typedef'ed restrict pointers may break compilation.
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
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Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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Potentially Related:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91344
The following code compiles on Clang, MSVC, and ICC. But it fails on GCC.
https://godbolt.org/z/6pTjDc
#ifdef _WIN32
#define RESTRICT __restrict
#else
#define RESTRICT __restrict__
#endif
template <typename type> using r_ptr = type *RESTRICT;
template <typename Type>
class Child{
void func(r_ptr<int> ptr);
};
template <> void Child<int>::func(r_ptr<int> ptr){}
GCC fails to compile it:
<source>:8:18: error: template-id 'func<>' for 'void
Child<int>::func(r_ptr<int>)' does not match any template declaration
8 | template <> void Child<int>::func(r_ptr<int> ptr){}
| ^~~~~~~~~~
<source>:8:49: note: saw 1 'template<>', need 2 for specializing a member
function template
8 | template <> void Child<int>::func(r_ptr<int> ptr){}
| ^
ASM generation compiler returned: 1
<source>:8:18: error: template-id 'func<>' for 'void
Child<int>::func(r_ptr<int>)' does not match any template declaration
8 | template <> void Child<int>::func(r_ptr<int> ptr){}
| ^~~~~~~~~~
<source>:8:49: note: saw 1 'template<>', need 2 for specializing a member
function template
8 | template <> void Child<int>::func(r_ptr<int> ptr){}
| ^
Execution build compiler returned: 1
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Subject: [Bug c++/91334] [10 Regression] ICE in propagate_necessity at gcc/tree-ssa-dce.c:813 since r273791
Date: Sun, 04 Aug 2019 08:28:00 -0000
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David Binderman <dcb314 at hotmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dcb314 at hotmail dot com
--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
Another way to generate the same crash is to compile file
gcc testsuite file g++.old-deja/g++.oliva/new1.C with compiler flag -O2.
during GIMPLE pass: cddce
./g++.old-deja/g++.oliva/new1.C: In function â<80><98>int main()â<80><99>:
./g++.old-deja/g++.oliva/new1.C:20:43: internal compiler error: in
gimple_call_arg, at gimple.h:3190
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Subject: [Bug testsuite/58321] FAIL: gcc.target/i386/memcpy-strategy-3.c scan-assembler-times memcpy 2 on x86_64-apple-darwin*
Date: Sun, 04 Aug 2019 09:54:00 -0000
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--- Comment #9 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sun Aug 4 09:53:37 2019
New Revision: 274058
URL: https://gcc.gnu.org/viewcvs?rev=274058&root=gcc&view=rev
Log:
Darwin, X86, backport fix for PR58321.
2019-08-04 Iain Sandoe <iain@sandoe.co.uk>
Backport from mainline.
2019-05-20 Iain Sandoe <iain@sandoe.co.uk>
PR testsuite/58321
* gcc.target/i386/memcpy-strategy-3.c: Adjust count for Darwin and
add a comment as to the reason for the difference.
* gcc.target/i386/memset-strategy-1.c: Likewise.
Modified:
branches/gcc-9-branch/gcc/testsuite/ChangeLog
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/memcpy-strategy-3.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/memset-strategy-1.c
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Subject: [Bug testsuite/58321] FAIL: gcc.target/i386/memcpy-strategy-3.c scan-assembler-times memcpy 2 on x86_64-apple-darwin*
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--- Comment #10 from Iain Sandoe <iains at gcc dot gnu.org> ---
fixed for trunk and 9.2
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Subject: [Bug target/63891] [7/8/9 regression] Failure of darwin-weakimport-3.c
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--- Comment #14 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sun Aug 4 09:59:21 2019
New Revision: 274059
URL: https://gcc.gnu.org/viewcvs?rev=274059&root=gcc&view=rev
Log:
Darwin, testsuite, backport fix for PR83891
2019-08-04 Iain Sandoe <iain@sandoe.co.uk>
Backport from mainline.
2019-05-21 Iain Sandoe <iain@sandoe.co.uk>
PR target/63891
* gcc.dg/darwin-weakimport-3.c: Adjust options and explain
the reasons.
Modified:
branches/gcc-9-branch/gcc/testsuite/ChangeLog
branches/gcc-9-branch/gcc/testsuite/gcc.dg/darwin-weakimport-3.c
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Subject: [Bug target/63891] [7/8/9 regression] Failure of darwin-weakimport-3.c
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--- Comment #15 from Iain Sandoe <iains at gcc dot gnu.org> ---
fixed on trunk and for 9.2
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Subject: [Bug testsuite/67958] The tests changed by r223498 now FAILs on darwin
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67958
--- Comment #7 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sun Aug 4 10:06:33 2019
New Revision: 274060
URL: https://gcc.gnu.org/viewcvs?rev=274060&root=gcc&view=rev
Log:
Darwin, X86, backport testsuite fix for 67958.
2019-08-04 Iain Sandoe <iain@sandoe.co.uk>
Backport from mainline.
2019-05-21 Iain Sandoe <iain@sandoe.co.uk>
PR testsuite/67958
* gcc.target/i386/pr32219-1.c: Adjust scan-asms for Darwin, comment
the differences.
* gcc.target/i386/pr32219-2.c: Likewise.
* gcc.target/i386/pr32219-3.c: Likewise.
* gcc.target/i386/pr32219-4.c: Likewise.
* gcc.target/i386/pr32219-5.c: Likewise.
* gcc.target/i386/pr32219-6.c: Likewise.
* gcc.target/i386/pr32219-7.c: Likewise.
* gcc.target/i386/pr32219-8.c: Likewise.
Modified:
branches/gcc-9-branch/gcc/testsuite/ChangeLog
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr32219-1.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr32219-2.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr32219-3.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr32219-4.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr32219-5.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr32219-6.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr32219-7.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr32219-8.c
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Subject: [Bug testsuite/67958] The tests changed by r223498 now FAILs on darwin
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67958
Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |7.5
--- Comment #8 from Iain Sandoe <iains at gcc dot gnu.org> ---
fixed on trunk and for 9.2
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Subject: [Bug testsuite/27221] g++.dg/ext/alignof2.C fails on powerpc-darwin (and powerpc-aix)
Date: Sun, 04 Aug 2019 10:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=27221
--- Comment #5 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sun Aug 4 10:11:53 2019
New Revision: 274061
URL: https://gcc.gnu.org/viewcvs?rev=274061&root=gcc&view=rev
Log:
Darwin, testsuite, backport for for 27221.
This can't pass on 32b power Darwin, since the ABI conflicts.
2019-08-04 Iain Sandoe <iain@sandoe.co.uk>
Backport from mainline.
2019-05-22 Iain Sandoe <iain@sandoe.co.uk>
PR testsuite/27221
* g++.dg/ext/alignof2.C: XFAIL for 32bit Darwin.
Modified:
branches/gcc-9-branch/gcc/testsuite/ChangeLog
branches/gcc-9-branch/gcc/testsuite/g++.dg/ext/alignof2.C
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Subject: [Bug testsuite/27221] g++.dg/ext/alignof2.C fails on powerpc-darwin (and powerpc-aix)
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--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
fixed on trunk and for 9.2
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Subject: [Bug rtl-optimization/64895] RA picks the wrong register for -fipa-ra
Date: Sun, 04 Aug 2019 10:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64895
--- Comment #18 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sun Aug 4 10:24:34 2019
New Revision: 274062
URL: https://gcc.gnu.org/viewcvs?rev=274062&root=gcc&view=rev
Log:
Darwin, X86, backport fixes for 64895.
Although this is marked as rtl-optimisation, the Darwin
issue is that the testcase XPASS there since the codegen
is different.
2019-08-04 Iain Sandoe <iain@sandoe.co.uk>
Backport from mainline.
2019-05-23 Iain Sandoe <iain@sandoe.co.uk>
PR rtl-optimisation/64895
* gcc.target/i386/fuse-caller-save-rec.c: Remove XFAILs.
* gcc.target/i386/fuse-caller-save.c: Likewise.
* gcc.target/i386/fuse-caller-save-xmm.c: Adjust tests for
PIC cases, remove XFAILs.
Modified:
branches/gcc-9-branch/gcc/testsuite/ChangeLog
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/fuse-caller-save-rec.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/fuse-caller-save-xmm.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/fuse-caller-save.c
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Subject: [Bug rtl-optimization/64895] RA picks the wrong register for -fipa-ra
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64895
--- Comment #19 from Iain Sandoe <iains at gcc dot gnu.org> ---
testsuite fix applied for pic targets on trunk and 9.2
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Subject: [Bug target/90698] Darwin X86 backend lacks support for mcmodel={medium, large, kernel}
Date: Sun, 04 Aug 2019 11:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90698
--- Comment #7 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sun Aug 4 11:54:13 2019
New Revision: 274073
URL: https://gcc.gnu.org/viewcvs?rev=274073&root=gcc&view=rev
Log:
Darwin, X86, backport test adjusts for PR90698.
We don't have support for -mcmodel={medium, large, kernel} so don't
expect tests for those things to work.
For now mark them as xfail where possible and skip where that isn't.
These changes will be logged onto the PR and therefore can be backed
out when the facility is implemented.
2019-08-04 Iain Sandoe <iain@sandoe.co.uk>
Backport from mainline.
2019-06-01 Iain Sandoe <iain@sandoe.co.uk>
PR target/90698
* gcc.target/i386/pr49866.c: XFAIL for Darwin.
* gcc.target/i386/pr63538.c: Likewise.
* gcc.target/i386/pr61599-1.c: Skip for Darwin.
Modified:
branches/gcc-9-branch/gcc/testsuite/ChangeLog
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr49866.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr61599-1.c
branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr63538.c
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Subject: [Bug testsuite/65364] FAIL: gcc.dg/uninit-19.c (test for warnings, line 22)
Date: Sun, 04 Aug 2019 12:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65364
--- Comment #5 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sun Aug 4 12:04:06 2019
New Revision: 274076
URL: https://gcc.gnu.org/viewcvs?rev=274076&root=gcc&view=rev
Log:
Darwin, testsuite, backport fix for PR65364
This test currently fails on Darwin, because the port inlines fn2 for
both PIC (and non-pic for m32). Fixed by adjusting the target condition.
2019-08-04 Iain Sandoe <iain@sandoe.co.uk>
Backport from mainline.
2019-06-11 Iain Sandoe <iain@sandoe.co.uk>
PR testsuite/65364
* gcc.dg/uninit-19.c (fn1): Adjust target condition for Darwin.
(fn2): Likewise.
Modified:
branches/gcc-9-branch/gcc/testsuite/ChangeLog
branches/gcc-9-branch/gcc/testsuite/gcc.dg/uninit-19.c
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Iain Sandoe <iains at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |iains at gcc dot gnu.org
--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
fixed on Darwin for trunk and for 9.2
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Subject: [Bug gcov-profile/91087] g++.dg/gcov/pr16855.C fails everywhere on Darwin.
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--- Comment #3 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sun Aug 4 13:12:26 2019
New Revision: 274092
URL: https://gcc.gnu.org/viewcvs?rev=274092&root=gcc&view=rev
Log:
Darwin, testsuite, backport fix for 91087.
The testcase is failing to instrument part of the source because of a bug
in the ordering of static DTORs. It seems unlikely that this is generically
fixable in the toolchain (and given that it's likely to be a dynamic loader
change would not be expected to be applied retrospectively to OS versions
that are out of support). To avoid the testsuite noise, xfail the count lines
that don't match (we can adjust the xfails as/when the upstream bug is fixed).
dejagnu xfails do not seem to work when embedded in a line like:
~Test (void) { .... /* count(1) { xfail ... } */ }
the closing brace seems to confuse the parser. The solution is to exapnd the
text onto three lines.
2019-08-04 Iain Sandoe <iain@sandoe.co.uk>
Backport from mainline.
2019-07-25 Iain Sandoe <iain@sandoe.co.uk>
PR gcov-profile/91087
* g++.dg/gcov/pr16855.C: Xfail the count lines for the DTORs and the
"final" line for the failure summaries. Adjust source layout so that
dejagnu xfail expressions work.
Modified:
branches/gcc-9-branch/gcc/testsuite/ChangeLog
branches/gcc-9-branch/gcc/testsuite/g++.dg/gcov/pr16855.C
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Subject: [Bug gcov-profile/91087] g++.dg/gcov/pr16855.C fails everywhere on Darwin.
Date: Sun, 04 Aug 2019 13:14:00 -0000
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Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|10.0 |7.5
--- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> ---
fixed on trunk and for 9.2 (this fails on all open branches)
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Subject: [Bug objc/90709] [meta-bug] GNU Objective C (C++) cannot consume current headers on Darwin platforms.
Date: Sun, 04 Aug 2019 13:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90709
--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sun Aug 4 13:34:19 2019
New Revision: 274095
URL: https://gcc.gnu.org/viewcvs?rev=274095&root=gcc&view=rev
Log:
Objective-C, NeXT, backport workaround for PR90709
Since we cannot parse the current NeXT headers, because of PR90709 and its
dependents, we have a large amount of testsuite noise for Darwin platforms.
In order to restore the usefulness of the testsuite, we are going add headers
without the modern syntax elements that trigger the bug, and use these for
test runs on newer Darwin.
The headers are imported from GNUStep, with some local modifications to make
sure that __BLOCKS__ is honoured as a gate for Apple-style blocks closures.
CF-CFString.h, F-NS*.h are proxy headers that use the installed CoreFoundation
or Foundation headers on systems <= Darwin12 and the GNUStep headers for newer.
Use the CF-CFString.h, F-NS*.h proxy headers where needed in the objective-c
testsuite. Make minor adjustments to tests as required, providing that those
do not alter the test intent.
2019-08-04 Iain Sandoe <iain@sandoe.co.uk>
Backport from mainline.
2019-06-15 Iain Sandoe <iain@sandoe.co.uk>
PR objc/90709
* obj-c++.dg/proto-lossage-7.mm: Use proxy headers.
* obj-c++.dg/strings/const-cfstring-2.mm: Likewise.
* obj-c++.dg/strings/const-cfstring-5.mm: Likewise
* obj-c++.dg/strings/const-str-12.mm: Likewise.
* obj-c++.dg/syntax-error-1.mm: Likewise.
* obj-c++.dg/torture/strings/const-cfstring-1.mm: Likewise.
* obj-c++.dg/torture/strings/const-str-10.mm: Likewise.
* obj-c++.dg/torture/strings/const-str-11.mm: Likewise.
* obj-c++.dg/torture/strings/const-str-9.mm: Likewise.
* obj-c++.dg/cxx-ivars-3.mm: Skip on later Darwin, where the 10.4 API
in no longer supported, also on m64 where there's no meaning to it.
* obj-c++.dg/isa-field-1.mm: Suppress unwanted warning, add comment
why.
* obj-c++.dg/objc-gc-3.mm: Skip for Darwin > 16, the API use is an
error
there.
* obj-c++.dg/qual-types-1.mm: Prune a spurious l64 warning.
* obj-c++.dg/stubify-1.mm: Tidy up after better compiler warnings.
* obj-c++.dg/stubify-2.mm: Likewise.
* obj-c++.dg/try-catch-1.mm: Likewise.
* obj-c++.dg/try-catch-3.mm: Likewise.
Backport from mainline.
2019-06-15 Iain Sandoe <iain@sandoe.co.uk>
PR objc/90709
* objc.dg/encode-7-next-64bit.m: Use proxy headers.
* objc.dg/image-info.m: Likewise.
* objc.dg/method-6.m: Likewise.
* objc.dg/no-extra-load.m: Likewise.
* objc.dg/objc-foreach-4.m: Likewise.
* objc.dg/objc-foreach-5.m: Likewise.
* objc.dg/proto-lossage-7.m: Likewise.
* objc.dg/strings/const-cfstring-2.m: Likewise.
* objc.dg/strings/const-cfstring-5.m: Likewise.
* objc.dg/strings/const-str-12b.m: Likewise.
* objc.dg/symtab-1.m: Likewise.
* objc.dg/torture/strings/const-cfstring-1.m: Likewise.
* objc.dg/torture/strings/const-str-10.m: Likewise.
* objc.dg/torture/strings/const-str-11.m: Likewise.
* objc.dg/torture/strings/const-str-9.m: Likewise.
* objc.dg/zero-link-1.m: Likewise.
* objc.dg/zero-link-2.m: Likewise.
* objc.dg/zero-link-3.m: Likewise.
* objc.dg/isa-field-1.m: Suppress unwanted warning, add comment why.
* objc.dg/headers.m: XFAIL for Darwin14-19.
* objc.dg/objc-gc-4.m: Skip for Darwin > 16, the API use is an error
there.
Backport from mainline.
2019-06-15 Iain Sandoe <iain@sandoe.co.uk>
PR objc/90709
* objc-obj-c++-shared/CF-CFString.h: New.
* objc-obj-c++-shared/F-NSArray.h: New.
* objc-obj-c++-shared/F-NSAutoreleasePool.h: New.
* objc-obj-c++-shared/F-NSObject.h: New.
* objc-obj-c++-shared/F-NSString.h: New.
* objc-obj-c++-shared/F-NSValue.h: New.
* objc-obj-c++-shared/GNUStep/CoreFoundation/CFArray.h: New.
* objc-obj-c++-shared/GNUStep/CoreFoundation/CFAvailability.h: New.
* objc-obj-c++-shared/GNUStep/CoreFoundation/CFBase.h: New.
* objc-obj-c++-shared/GNUStep/CoreFoundation/CFCharacterSet.h: New.
* objc-obj-c++-shared/GNUStep/CoreFoundation/CFData.h: New.
* objc-obj-c++-shared/GNUStep/CoreFoundation/CFDictionary.h: New.
* objc-obj-c++-shared/GNUStep/CoreFoundation/CFLocale.h: New.
* objc-obj-c++-shared/GNUStep/CoreFoundation/CFString.h: New.
* objc-obj-c++-shared/GNUStep/Foundation/NSArray.h: New.
* objc-obj-c++-shared/GNUStep/Foundation/NSAutoreleasePool.h: New.
* objc-obj-c++-shared/GNUStep/Foundation/NSDate.h: New.
* objc-obj-c++-shared/GNUStep/Foundation/NSEnumerator.h: New.
* objc-obj-c++-shared/GNUStep/Foundation/NSGeometry.h: New.
* objc-obj-c++-shared/GNUStep/Foundation/NSObjCRuntime.h: New.
* objc-obj-c++-shared/GNUStep/Foundation/NSObject.h: New.
* objc-obj-c++-shared/GNUStep/Foundation/NSRange.h: New.
* objc-obj-c++-shared/GNUStep/Foundation/NSString.h: New.
* objc-obj-c++-shared/GNUStep/Foundation/NSValue.h: New.
* objc-obj-c++-shared/GNUStep/Foundation/NSZone.h: New.
* objc-obj-c++-shared/GNUStep/GNUstepBase/GNUstep.h: New.
* objc-obj-c++-shared/GNUStep/GNUstepBase/GSBlocks.h: New.
* objc-obj-c++-shared/GNUStep/GNUstepBase/GSConfig.h: New.
* objc-obj-c++-shared/GNUStep/GNUstepBase/GSObjCRuntime.h: New.
* objc-obj-c++-shared/GNUStep/GNUstepBase/GSVersionMacros.h: New.
* objc-obj-c++-shared/GNUStep/GNUstepBase/NSArray+GNUstepBase.h: New.
*
objc-obj-c++-shared/GNUStep/GNUstepBase/NSMutableString+GNUstepBase.h:
New.
* objc-obj-c++-shared/GNUStep/GNUstepBase/NSNumber+GNUstepBase.h: New.
* objc-obj-c++-shared/GNUStep/GNUstepBase/NSObject+GNUstepBase.h: New.
* objc-obj-c++-shared/GNUStep/GNUstepBase/NSString+GNUstepBase.h: New.
Added:
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/CF-CFString.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/F-NSArray.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/F-NSAutoreleasePool.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/F-NSObject.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/F-NSString.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/F-NSValue.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/CoreFoundation/
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/CoreFoundation/CFArray.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/CoreFoundation/CFAvailability.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/CoreFoundation/CFBase.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/CoreFoundation/CFCharacterSet.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/CoreFoundation/CFData.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/CoreFoundation/CFDictionary.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/CoreFoundation/CFLocale.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/CoreFoundation/CFString.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/NSArray.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/NSAutoreleasePool.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/NSDate.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/NSEnumerator.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/NSGeometry.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/NSObjCRuntime.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/NSObject.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/NSRange.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/NSString.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/NSValue.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/Foundation/NSZone.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/GNUstepBase/
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/GNUstepBase/GNUstep.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/GNUstepBase/GSBlocks.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/GNUstepBase/GSConfig.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/GNUstepBase/GSObjCRuntime.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/GNUstepBase/GSVersionMacros.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/GNUstepBase/NSArray+GNUstepBase.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/GNUstepBase/NSMutableString+GNUstepBase.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/GNUstepBase/NSNumber+GNUstepBase.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/GNUstepBase/NSObject+GNUstepBase.h
branches/gcc-9-branch/gcc/testsuite/objc-obj-c++-shared/GNUStep/GNUstepBase/NSString+GNUstepBase.h
Modified:
branches/gcc-9-branch/gcc/testsuite/ChangeLog
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/cxx-ivars-3.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/isa-field-1.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/objc-gc-3.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/proto-lossage-7.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/qual-types-1.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/strings/const-cfstring-2.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/strings/const-cfstring-5.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/strings/const-str-12.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/stubify-1.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/stubify-2.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/syntax-error-1.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/torture/strings/const-cfstring-1.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/torture/strings/const-str-10.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/torture/strings/const-str-11.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/torture/strings/const-str-9.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/try-catch-1.mm
branches/gcc-9-branch/gcc/testsuite/obj-c++.dg/try-catch-3.mm
branches/gcc-9-branch/gcc/testsuite/objc.dg/encode-7-next-64bit.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/headers.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/image-info.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/isa-field-1.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/method-6.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/no-extra-load.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/objc-foreach-4.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/objc-foreach-5.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/objc-gc-4.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/proto-lossage-7.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/strings/const-cfstring-2.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/strings/const-cfstring-5.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/strings/const-str-12b.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/symtab-1.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/torture/strings/const-cfstring-1.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/torture/strings/const-str-10.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/torture/strings/const-str-11.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/torture/strings/const-str-9.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/zero-link-1.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/zero-link-2.m
branches/gcc-9-branch/gcc/testsuite/objc.dg/zero-link-3.m
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Subject: [Bug objc/90709] [meta-bug] GNU Objective C (C++) cannot consume current headers on Darwin platforms.
Date: Sun, 04 Aug 2019 13:41:00 -0000
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Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |7.5
Known to fail| |7.4.1, 8.3.1
--- Comment #7 from Iain Sandoe <iains at gcc dot gnu.org> ---
workaround is applied to trunk and for 9.2 (problem exists on all open
branches)
>From gcc-bugs-return-650204-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 14:02:43 2019
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl.tools at gmail dot com,
| |jakub at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Intel intrinsics are in constant flux. E.g. the manual
(325462-sdm-vol-1-2abcd-3abcd.pdf) documents them as taking
Intel C/C++ Compiler Intrinsic Equivalent
VMOVNTDQA __m512i _mm512_stream_load_si512(void * p);
MOVNTDQA __m128i _mm_stream_load_si128 (__m128i *p);
VMOVNTDQA __m256i _mm_stream_load_si256 (__m256i *p);
VMOVNTDQ void _mm512_stream_si512(void * p, __m512i a);
VMOVNTDQ void _mm256_stream_si256 (__m256i * p, __m256i a);
MOVNTDQ void _mm_stream_si128 (__m128i * p, __m128i a);
VMOVNTPD void _mm512_stream_pd(double * p, __m512d a);
VMOVNTPD void _mm256_stream_pd (double * p, __m256d a);
MOVNTPD void _mm_stream_pd (double * p, __m128d a);
VMOVNTPS void _mm512_stream_ps(float * p, __m512d a);
MOVNTPS void _mm_stream_ps (float * p, __m128d a);
VMOVNTPS void _mm256_stream_ps (float * p, __m256 a);
That is what GCC implements. CLANG does the same thing, except uses
_mm512_stream_load_si512 (void const *__P)
https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm512_stream_&expand=5670
documents them with void * instead.
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Subject: [Bug target/91341] Missing AVX Intrinsics: load/store u2
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
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Subject: [Bug c++/91346] New: Implement P1668R1: Permit unevaluated inline asm in constexpr functions
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91346
Bug ID: 91346
Summary: Implement P1668R1: Permit unevaluated inline asm in
constexpr functions
Product: gcc
Version: 10.0
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As per <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1668r1.html>.
constexpr int
foo (int a, int b)
{
if (__builtin_is_constant_evaluated ())
return a + b;
asm("nop");
return a;
}
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Subject: [Bug fortran/88227] ICE in gfc_convert_boz, at fortran/target-memory.c:788
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--- Comment #11 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Sun Aug 4 15:52:55 2019
New Revision: 274096
URL: https://gcc.gnu.org/viewcvs?rev=274096&root=gcc&view=rev
Log:
2019-08-04 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/88227
* check.c (oct2bin): New function. Convert octal string to binary.
(hex2bin): New function. Convert hexidecimal string to binary.
(bin2real): New function. Convert binary string to REAL. Use
oct2bin and hex2bin.
(gfc_boz2real): Use fallback conversion bin2real.
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/check.c
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Subject: [Bug fortran/88227] ICE in gfc_convert_boz, at fortran/target-memory.c:788
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kargl at gcc dot gnu.org changed:
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--- Comment #12 from kargl at gcc dot gnu.org ---
Fixed on trunk. Hopefully, the last of the BOZ bugs.
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Subject: [Bug debug/86638] Og guality failures without -ftree-sra
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--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to rsandifo@gcc.gnu.org from comment #4)
> Author: rsandifo
> Date: Mon Jul 29 08:52:56 2019
> New Revision: 273872
>
> URL: https://gcc.gnu.org/viewcvs?rev=273872&root=gcc&view=rev
> Log:
> Prevent tree-ssa-dce.c from deleting stores at -Og
>
> DCE tries to delete dead stores to local data and also tries to insert
> debug binds for simple cases:
>
> /* If this is a store into a variable that is being optimized away,
> add a debug bind stmt if possible. */
> if (MAY_HAVE_DEBUG_BIND_STMTS
> && gimple_assign_single_p (stmt)
> && is_gimple_val (gimple_assign_rhs1 (stmt)))
> {
> tree lhs = gimple_assign_lhs (stmt);
> if ((VAR_P (lhs) || TREE_CODE (lhs) == PARM_DECL)
> && !DECL_IGNORED_P (lhs)
> && is_gimple_reg_type (TREE_TYPE (lhs))
> && !is_global_var (lhs)
> && !DECL_HAS_VALUE_EXPR_P (lhs))
> {
> tree rhs = gimple_assign_rhs1 (stmt);
> gdebug *note
> = gimple_build_debug_bind (lhs, unshare_expr (rhs), stmt);
> gsi_insert_after (i, note, GSI_SAME_STMT);
> }
> }
>
> But this doesn't help for things like "print *ptr" when ptr points
> to the local variable (tests Og-dce-1.c and Og-dce-2.c). It can
> also introduce wrong debug info for earlier references (second test
> in Og-dce-3.c) or make earlier references unavailable (first test
> in Og-dce-3.c).
>
> So for -Og I think it'd be better not to delete any stmts with
> vdefs for now. This also means that we can avoid the potentially
> expensive vop walks (which already have a cut-off, but still).
>
> The patch also fixes the Og failures in gcc.dg/guality/pr54970.c
> (PR 86638).
>
So can this be closed now then?
> 2019-07-29 Richard Sandiford <richard.sandiford@arm.com>
>
> gcc/
> PR debug/86638
> * tree-ssa-dce.c (keep_all_vdefs_p): New function.
> (mark_stmt_if_obviously_necessary): Mark all stmts with vdefs as
> necessary if keep_all_vdefs_p is true.
> (mark_aliased_reaching_defs_necessary): Add a gcc_checking_assert
> that keep_all_vdefs_p is false.
> (mark_all_reaching_defs_necessary): Likewise.
> (propagate_necessity): Skip the vuse scan if keep_all_vdefs_p is true.
>
> gcc/testsuite/
> * c-c++-common/guality/Og-dce-1.c: New test.
> * c-c++-common/guality/Og-dce-2.c: Likewise.
> * c-c++-common/guality/Og-dce-3.c: Likewise.
>
> Added:
> trunk/gcc/testsuite/c-c++-common/guality/Og-dce-1.c
> trunk/gcc/testsuite/c-c++-common/guality/Og-dce-2.c
> trunk/gcc/testsuite/c-c++-common/guality/Og-dce-3.c
> Modified:
> trunk/gcc/ChangeLog
> trunk/gcc/testsuite/ChangeLog
> trunk/gcc/tree-ssa-dce.c
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Subject: [Bug target/91341] Missing AVX Intrinsics: load/store u2
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91341
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 46668
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46668&action=edit
gcc10-pr91341.patch
Untested implementation.
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Subject: [Bug c/91285] _Pragma does not work in a useful fashion
Date: Sun, 04 Aug 2019 16:08:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
related to or dup of bug 90400 or bug 69558?
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/91312] -Wconversion warning with += operator
Date: Sun, 04 Aug 2019 16:15:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> THis is not a bug, In C, "i += MACRO;" is equivant to:
> i = i + MACRO.
> And since you are using a type smaller than int, it is prompted to int.
>
> NOTE there might be another bug associated with this one.
bug 40752?
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91314] Confusing warning refers to nonexistent comma operator
Date: Sun, 04 Aug 2019 16:18:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Keith Thompson from comment #0)
> Test case:
>
> int main() {
> int a;
> &(a=0);
> }
>
> Demonstration:
>
> $ g++ -c -Wunused-value confusing_warning.cpp
> confusing_warning.cpp: In function ‘int main()’:
> confusing_warning.cpp:3:7: warning: right operand of comma operator has no
> effect [-Wunused-value]
> 3 | &(a=0);
> | ^
>
> The problem: The warning refers to a comma operator that does not
> exist in the source.
Reminds me of bug 70619
>
> Speculation (please ignore this if it's not useful):
> The compiler internally generates some internal data structure that's
> similar to a comma operator (something like `(a=0), &a`) and the
> warning message is based on that.
>
> I've reproduced this problem with all versions of g++ I have access
> to, from 4.1.2 to 10.0.0 20190718 (experimental).
>
> This problem was originally reported by Stefan Ram <ram@zedat.fu-berlin.de>
> on comp.lang.c++, 2019-07-24, thread "why can't I apply a bitwise modifier
> directly in a function call?".
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Subject: [Bug target/91342] Incorrect parameter type for AVX512 streaming intrinsics.
Date: Sun, 04 Aug 2019 16:20:00 -0000
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--- Comment #2 from Alex Yee <a-yee at u dot northwestern.edu> ---
Oh I didn't realize Intel's docs were conflicting. I think most people just use
the interactive intrinsics guide.
MSVC and Intel's own compiler implement the void* variants. Thus, this comes up
when porting code coming from those.
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Subject: [Bug c++/91318] [C++][PATCH] warnings about unused internal macros with -Wunused-macros and #pragma GCC optimize
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
Blocks| |89180
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Piotr Henryk Dabrowski from comment #1)
> Created attachment 46656 [details]
> 0001-do-not-warn-unused-macros-pragma-gcc-optimize.patch
please send the patch to the gcc-patches mailing list for review
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89180
[Bug 89180] [meta-bug] bogus/missing -Wunused warnings
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/86120] SIGSEGV without backtrace when using submodules
Date: Sun, 04 Aug 2019 16:33:00 -0000
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
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CC| |kargl at gcc dot gnu.org
--- Comment #2 from kargl at gcc dot gnu.org ---
The code in the attached bug report is invalid, but causes an ICE.
Changing the local variable 'a' to 'c' in the function 'f' makes
it easier to see. Here's the altered code:
program bug
real, target, allocatable :: a(:,:)
allocate(a(10, 10))
a = 1.
print *, f(a)
contains
function f(b) result(x)
real, target, intent(in):: b(:,:)
real, pointer :: c(:,:)
real :: x(size(c(1,:))) ! <-- This is an invalid use of 'c'
c => b(1:2,:)
x = c(2,:)
end function f
end program bug
With trunk, I see
mobile:kargl[214] gfcx -o z bug.f90
bug.f90:1:0:
1 | program bug
|
internal compiler error: c from f referenced in bug
0x8a7cb22 convert_nonlocal_reference_op
../../gcc/gcc/tree-nested.c:1063
0x8cab1b8 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
../../gcc/gcc/tree.c:12237
0x8a7cb60 convert_nonlocal_reference_op
../../gcc/gcc/tree-nested.c:1157
0x8cab1b8 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
../../gcc/gcc/tree.c:12237
0x8740963 walk_gimple_op(gimple*, tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:202
0x8740dbc walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:596
0x8740f3b walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:51
0x8740e59 walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:641
0x8740f3b walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:51
0x8740e21 walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:686
0x8740f3b walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:51
0x8740e59 walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:641
0x8740f3b walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:51
0x8740e21 walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:686
0x8740f3b walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:51
0x8740e21 walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:686
0x8740f3b walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:51
0x8740e59 walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:641
0x8740f3b walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:51
0x8740e21 walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
../../gcc/gcc/gimple-walk.c:686
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Subject: [Bug middle-end/86120] SIGSEGV without backtrace when using submodules
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|fortran |middle-end
--- Comment #3 from kargl at gcc dot gnu.org ---
Given the ICE in comment #2, I'm switching this to a middle-end bug.
Richard (or whoever) feel free to switch it back to fortran. The
cause of the problem is due to an unallocated Fortran pointer in
the line with the comment. The ICE occurs in the middle-end, but
this is likely a Fortran bug because the Fortran FE doesn't detect
the invalid reference.
>From gcc-bugs-return-650219-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 17:12:07 2019
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Subject: [Bug middle-end/86120] ICE caused by unassociated pointer in SIZE intrinsic
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|SIGSEGV without backtrace |ICE caused by unassociated
|when using submodules |pointer in SIZE intrinsic
--- Comment #4 from kargl at gcc dot gnu.org ---
Just realized the original subject of this PR is nonsense.
There isn't a submodule in the attached code. Updating
to something a little more reasonable.
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From: "danglin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/91347] New: [7,8,9 Regression] pointer_string in linux vsprintf.c is miscompiled when sibling calls are optimized
Date: Sun, 04 Aug 2019 17:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91347
Bug ID: 91347
Summary: [7,8,9 Regression] pointer_string in linux vsprintf.c
is miscompiled when sibling calls are optimized
Product: gcc
Version: 8.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: danglin at gcc dot gnu.org
CC: deller at gmx dot de, svens at stackframe dot org
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Host: hppa-unknown-linux-gnu
Target: hppa-unknown-linux-gnu
Build: hppa-unknown-linux-gnu
Created attachment 46669
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46669&action=edit
Preproccessed source
Sven Schnelle wrote:
I wasn't able to write a reproducer so far, but the problem is in
lib/vsprintf.c
pointer_string():
char *pointer_string(char *buf, char *end,
const void *ptr,
struct printf_spec spec)
{
spec.base = 16;
spec.flags |= SMALL;
if (spec.field_width == -1) {
spec.field_width = 2 * sizeof(ptr);
spec.flags |= ZEROPAD;
}
return number(buf, end, (unsigned long int)ptr, spec);
}
this generates:
00003a34 <pointer_string>:
{
3a34: 4b dc 3f 91 ldw -38(sp),ret0
3a38: 6b c2 3f d9 stw rp,-14(sp)
3a3c: d3 9c 1f e8 extrw,s ret0,31,24,ret0
if (spec.field_width == -1) {
3a40: 93 80 37 ff cmpiclr,<> -1,ret0,r0
3a44: 34 1c 00 10 ldi 8,ret0
return number(buf, end, (unsigned long int)ptr, spec);
3a48: 4b d3 3f 91 ldw -38(sp),r19
3a4c: 34 17 00 00 ldi 0,r23
}
3a50: 4b c2 3f d9 ldw -14(sp),rp
return number(buf, end, (unsigned long int)ptr, spec);
3a54: d6 7c 0c 08 depw ret0,31,24,r19
3a58: 6b d3 3f 91 stw r19,-38(sp)
3a5c: e8 1e 0d bd b,l 1140 <number>,r0
3a60: 08 00 02 40 nop
3a64: 08 00 02 40 nop
I don't see where spec.base get's assigned, and even the source code line is
omitted in the objdump -S output.
The problem can be duplicated by compiling with -O2 or -Os.
The type of spec is:
struct printf_spec {
unsigned int type:8;
signed int field_width:24;
unsigned int flags:8;
unsigned int base:8;
signed int precision:16;
} __attribute__((__packed__));
Reviewing the RTL dumps, I see that the assignment of spec.base is dropped in
the dse1 pass. In vsprintf.i.258r.cse2, we have:
(insn 19 15 20 2 (set (reg:QI 113)
(const_int 16 [0x10]))
"/home/svens/linux-kernel/parisc-linux/src/lib/vsprintf.c":675 65 {*pa.md:3045}
(nil))
(insn 20 19 63 2 (set (mem/j/c:QI (plus:SI (reg/f:SI 107)
(const_int 5 [0x5])) [241 spec.base+0 S1 A8])
(reg:QI 113))
"/home/svens/linux-kernel/parisc-linux/src/lib/vsprintf.c":675 65 {*pa.md:3045}
(expr_list:REG_DEAD (reg:QI 113)
(expr_list:REG_DEAD (reg/f:SI 107)
(nil))))
This changes in vsprintf.i.259r.dse1 to:
(insn 19 15 21 2 (set (reg:QI 113)
(const_int 16 [0x10]))
"/home/svens/linux-kernel/parisc-linux/src/lib/vs
printf.c":675 65 {*pa.md:3045}
(nil))
(jump_insn 21 19 22 2 (set (pc)
(if_then_else (eq (reg:SI 98 [ spec$field_width ])
(const_int -1 [0xffffffffffffffff]))
(label_ref 27)
(pc)))
"/home/svens/linux-kernel/parisc-linux/src/lib/vsprintf.c":67
7 30 {*pa.md:1413}
(int_list:REG_BR_PROB 365072228 (nil))
-> 27)
The DSE processing for insn 20 is:
**scanning insn=20
mem: (plus:SI (reg/f:SI 107)
(const_int 5 [0x5]))
after canon_rtx address: (plus:SI (reg/f:SI 3 %r3)
(const_int -51 [0xffffffffffffffcd]))
gid=0 offset=-51
processing const base store gid=0[-51..-50)
mems_found = 1, cannot_delete = false
starting to process insn 20
v: 1, 2
i = -51, index = 1
deferring deletion of insn with uid = 20.
Gcc-6 doesn't drop the spec.base assignment. Dropping the assignment causes
calls to pointer_string to be output in decimal.
>From gcc-bugs-return-650221-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 18:12:31 2019
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Subject: [Bug c/89549] [7/8/9/10 Regression] -Wmisleading-indentation is disabled from this point onwards, since column-tracking was disabled due to the size of the code/headers
Date: Sun, 04 Aug 2019 18:12:00 -0000
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--- Comment #9 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Dávid Bolvanský from comment #8)
> Why this annoying note cannot be disabled using
> #pragma GCC diagnostic ignored "-Wmisleading-indentation" ?
When a note associated with a warning can't be disabled with a pragma, that
usually means that someone forgot to check the return value of the warning()
call in GCC before calling inform(), but I dunno if that's the case here...
>
> So only solution is -Wno-misleading-indentation?
>From gcc-bugs-return-650222-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 21:24:45 2019
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From: "noone@turm-lahnstein.de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/91348] New: Missed optimization: not passing hidden pointer but copying memory
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Bug ID: 91348
Summary: Missed optimization: not passing hidden pointer but
copying memory
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
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Priority: P3
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For the following example:
struct Vec3{
double x, y, z;
};
void vadd_v2(struct Vec3* a, struct Vec3* out);
struct Vec3 use_v1(struct Vec3 *in){
struct Vec3 out;
vadd_v2(in, &out);
return out;
}
the resulting assembler (-O2 -Wall) is:
use_v1:
pushq %r12
movq %rdi, %r12
movq %rsi, %rdi
subq $32, %rsp
movq %rsp, %rsi
call vadd_v2
movq 16(%rsp), %rax
movdqa (%rsp), %xmm0
movq %rax, 16(%r12)
movq %r12, %rax
movups %xmm0, (%r12)
addq $32, %rsp
popq %r12
ret
However, the hidden pointer could be passed directly into vadd_v2, which is
what clang is doing:
use_v1: # @use_v1
pushq %rbx
movq %rdi, %rbx
movq %rsi, %rdi
movq %rbx, %rsi
callq vadd_v2
movq %rbx, %rax
popq %rbx
retq
See also https://godbolt.org/z/rT41Sj
>From gcc-bugs-return-650223-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 21:56:06 2019
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From: "gerald at pfeifer dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/91349] New: [9 regression] powerpc*-*-freebsd* defines _GNU_SOURCE
Date: Sun, 04 Aug 2019 21:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91349
Bug ID: 91349
Summary: [9 regression] powerpc*-*-freebsd* defines _GNU_SOURCE
Product: gcc
Version: 9.1.0
URL: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=2396
48
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: gerald at pfeifer dot com
CC: amodra at gcc dot gnu.org, amodra at gmail dot com,
andreast at gcc dot gnu.org
Target Milestone: ---
Target: powerpc*-*-freebsd*
This originally was reported on the FreeBSD side as
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239648 .
Between GCC 8 and GCC 9 powerpc*-*-freebsd* started to define _GNU_SOURCE
which is not appropriate on that platform and different behavior from other
FreeBSD platforms.
I believe this was introduced with
https://gcc.gnu.org/ml/gcc-patches/2018-11/msg00921.html
and
* config.gcc (powerpc*-*-freebsd*, powerpc-*-netbsd*),
(powerpc-*-eabisimaltivec*, powerpc-*-eabisim*, powerpc-*-elf*),
(powerpc-*-eabialtivec*, powerpc-*-eabi*, powerpc-*-rtems*),
(powerpc-wrs-vxworks*, powerpc-*-lynxos*, powerpcle-*-elf*),
(powerpcle-*-eabisim*, powerpcle-*-eabi*): Add gnu-user.h to tm_file.
* config/rs6000/freebsd.h (CPLUSPLUS_CPP_SPEC),
(LINK_GCC_C_SEQUENCE_SPEC): Undef.
(ASM_APP_ON, ASM_APP_OFF): Don't define.
* config/rs6000/freebsd64.h (ASM_APP_ON, ASM_APP_OFF): Don't define.
:
>From gcc-bugs-return-650224-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 22:04:51 2019
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Subject: [Bug c/91348] Missed optimization: not passing hidden pointer but copying memory
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--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
NRVO happens in the C++ front-end, but not the C one, and the general
tree-nrv.c is rather limited.
>From gcc-bugs-return-650225-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 04 23:36:11 2019
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Subject: [Bug target/91349] [9 regression] powerpc*-*-freebsd* defines _GNU_SOURCE
Date: Sun, 04 Aug 2019 23:36:00 -0000
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Alan Modra <amodra at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-08-04
Assignee|unassigned at gcc dot gnu.org |amodra at gmail dot com
Ever confirmed|0 |1
--- Comment #1 from Alan Modra <amodra at gmail dot com> ---
Huh, it looks like I missed adding the following to freebsd64.h:
#undef CPLUSPLUS_CPP_SPEC
#undef LINK_GCC_C_SEQUENCE_SPEC
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Subject: [Bug fortran/87233] Constraint C1279 still followed after f2008 standard revision (?)
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--- Comment #8 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Author: jvdelisle
Date: Mon Aug 5 00:47:41 2019
New Revision: 274104
URL: https://gcc.gnu.org/viewcvs?rev=274104&root=gcc&view=rev
Log:
2019-08-04 Jerry DeLisle <jvdelisle@gcc.gnu.org>
Backport from trunk
PR fortran/87233
* expr.c (check_restricted): Relax constraint C1279 which was
removed from F2008 and above.
* gfortran.dg/initialization_14.f90: Modify to now pass by
removing two dg-error commands. Added comments.
* gfortran.dg/initialization_30.f90: New test that includes the
two tests removed above with the 'dg-options -std=f95'.
Added:
branches/gcc-9-branch/gcc/testsuite/gfortran.dg/initialization_30.f90
Modified:
branches/gcc-9-branch/gcc/fortran/ChangeLog
branches/gcc-9-branch/gcc/fortran/expr.c
branches/gcc-9-branch/gcc/testsuite/ChangeLog
branches/gcc-9-branch/gcc/testsuite/gfortran.dg/initialization_14.f90
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Subject: [Bug fortran/87233] Constraint C1279 still followed after f2008 standard revision (?)
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Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #9 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Fixed now on gcc9, so closing.
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Subject: [Bug target/91349] [9 regression] powerpc*-*-freebsd* defines _GNU_SOURCE
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--- Comment #2 from Alan Modra <amodra at gcc dot gnu.org> ---
Author: amodra
Date: Mon Aug 5 01:52:33 2019
New Revision: 274105
URL: https://gcc.gnu.org/viewcvs?rev=274105&root=gcc&view=rev
Log:
PR91349, powerpc64*-*-freebsd* defines _GNU_SOURCE
rev 266496 (git ab6b1bb456) undefined some macros in rs6000/freebsd.h
but missed doing the same in rs6000/freebsd64.h.
PR target/91349
* config/rs6000/freebsd64.h (CPLUSPLUS_CPP_SPEC),
(LINK_GCC_C_SEQUENCE_SPEC): Undef.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/freebsd64.h
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Subject: [Bug target/91349] [9 regression] powerpc*-*-freebsd* defines _GNU_SOURCE
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--- Comment #3 from Alan Modra <amodra at gcc dot gnu.org> ---
Author: amodra
Date: Mon Aug 5 01:53:31 2019
New Revision: 274106
URL: https://gcc.gnu.org/viewcvs?rev=274106&root=gcc&view=rev
Log:
PR91349, powerpc64*-*-freebsd* defines _GNU_SOURCE
rev 266496 (git ab6b1bb456) undefined some macros in rs6000/freebsd.h
but missed doing the same in rs6000/freebsd64.h.
PR target/91349
* config/rs6000/freebsd64.h (CPLUSPLUS_CPP_SPEC),
(LINK_GCC_C_SEQUENCE_SPEC): Undef.
Modified:
branches/gcc-9-branch/gcc/ChangeLog
branches/gcc-9-branch/gcc/config/rs6000/freebsd64.h
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Subject: [Bug target/91349] [9 regression] powerpc*-*-freebsd* defines _GNU_SOURCE
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Alan Modra <amodra at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.2
--- Comment #4 from Alan Modra <amodra at gmail dot com> ---
Fixed.
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Subject: [Bug sanitizer/91325] [ASAN] ASAN hangs at throw if called via dlopen
Date: Mon, 05 Aug 2019 04:28:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Target Milestone|--- |10.0
--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Ok, then libsanitizer merge from trunk will fix it. I'm planning to do it in
autumn this year for next GCC 10.1 release.
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Subject: [Bug c/80400] missing -Wattributes on a invalid attribute packed on a typedef
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
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Subject: [Bug c/80398] missing -Wattributes on a misplaced attribute packed in an enum definition
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
>From gcc-bugs-return-650235-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 04:42:57 2019
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Subject: [Bug sanitizer/91328] stack-use-after-scope for in-class initialization of std::vector<int> member using initializer_list
Date: Mon, 05 Aug 2019 04:42:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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Resolution|--- |DUPLICATE
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Duplicate.
*** This bug has been marked as a duplicate of bug 90570 ***
>From gcc-bugs-return-650234-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 04:42:20 2019
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Subject: [Bug c/80745] inconsistent warning: large integer implicitly truncated to unsigned type
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
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Subject: [Bug sanitizer/90570] AddressSanitizer: stack-use-after-scope
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Martin Liška <marxin at gcc dot gnu.org> changed:
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CC| |geert.fannes@auro-technolog
| |ies.com
--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
*** Bug 91328 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-650237-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 04:44:16 2019
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Subject: [Bug c/64825] -Wcast-qual does not warn about struct members which are arrays
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=91336
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
Another bug for a missing -Wcast-qual: bug 91336
>From gcc-bugs-return-650238-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 04:49:20 2019
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Subject: [Bug c++/91350] New: ICE in gimple_call_arg, at gimple.h:3190 during GIMPLE pass: cddce with options -O1 -fipa-sra
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Bug ID: 91350
Summary: ICE in gimple_call_arg, at gimple.h:3190 during GIMPLE
pass: cddce with options -O1 -fipa-sra
Product: gcc
Version: 10.0
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Created attachment 46670
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46670&action=edit
Test case from chromium build
Compiling the attached code with options -O1 -fipa-sra I get the following:
g++ -S -O1 -fipa-sra gccerr78.C
during GIMPLE pass: cddce
p.cpp: In destructor ‘virtual Ice::Inst::~Inst()’:
p.cpp:21:1: internal compiler error: in gimple_call_arg, at gimple.h:3190
0x7b0c53 gimple_call_arg
../../gcc/gcc/gimple.h:3190
0x7b0c53 gimple_call_arg
../../gcc/gcc/gimple.h:3198
0x7b0c53 propagate_necessity
../../gcc/gcc/tree-ssa-dce.c:813
0x7b0c53 perform_tree_ssa_dce
../../gcc/gcc/tree-ssa-dce.c:1663
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-650239-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 04:52:16 2019
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Subject: [Bug c/70619] Wrong warning with VLA, comma and sizeof
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=91314
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
bug 91314 might be related to and/or a dup of this
>From gcc-bugs-return-650240-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 04:57:19 2019
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Subject: [Bug c/63710] Incorrect column number for -Wconversion
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
>From gcc-bugs-return-650241-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 04:58:38 2019
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/78155] missing warning on invalid isalpha et al.
Date: Mon, 05 Aug 2019 04:58:00 -0000
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--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
Would you expect this warning to go under an existing flag, or a new one,
Martin?
>From gcc-bugs-return-650242-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 05:00:34 2019
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Subject: [Bug c/64619] No -Wsign-conversion warning
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing "new -Wconversion" author
>From gcc-bugs-return-650243-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 05:04:53 2019
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Subject: [Bug rtl-optimization/79688] ICE with a RTL test-case and -O1 provided
Date: Mon, 05 Aug 2019 05:04:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
assuming this is supposed to be valid, so adding ice-on-valid keyword
>From gcc-bugs-return-650244-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 05:05:02 2019
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91350] ICE in gimple_call_arg, at gimple.h:3190 during GIMPLE pass: cddce with options -O1 -fipa-sra
Date: Mon, 05 Aug 2019 05:05:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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CC| |marxin at gcc dot gnu.org
Resolution|--- |DUPLICATE
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Dup.
*** This bug has been marked as a duplicate of bug 91334 ***
>From gcc-bugs-return-650245-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 05:05:02 2019
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91334] [10 Regression] ICE in propagate_necessity at gcc/tree-ssa-dce.c:813 since r273791
Date: Mon, 05 Aug 2019 05:05:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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CC| |zeccav at gmail dot com
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
*** Bug 91350 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-650247-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 05:07:54 2019
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Subject: [Bug c/79959] -Wimplicit-fallthrough doesn't recognize some more complex exit cases
Date: Mon, 05 Aug 2019 05:07:00 -0000
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--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #3)
> (In reply to Marek Polacek from comment #2)
> > Should be possible to fix this. Mine.
>
> For gcc 9?
...er, 10 now, I guess?
>From gcc-bugs-return-650246-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 05:07:09 2019
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Subject: [Bug c/80619] bad fix-it hint for GCC %lu directive with int argument: %wu
Date: Mon, 05 Aug 2019 05:07:00 -0000
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--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
Did you do anything about this with your -Wformat-diag changes, Martin?
>From gcc-bugs-return-650248-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 05:09:51 2019
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Subject: [Bug tree-optimization/80535] missing -Wformat-overfow on POSIX directives with the apostrophe flag
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
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Subject: [Bug c/50476] Warn of pointer set to object whose lifetime is limited
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--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
would this proposed warning go under an existing flag, or a new one?
>From gcc-bugs-return-650250-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 05:44:05 2019
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Subject: [Bug lto/91287] LTO disables linking with scalar MASS library (Fortran only)
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--- Comment #31 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com> ---
(In reply to rguenther@suse.de from comment #30)
> On Fri, 2 Aug 2019, luoxhu at cn dot ibm.com wrote:
>
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91287
> >
> > --- Comment #28 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com> ---
> > (In reply to Richard Biener from comment #24)
> > > Btw, this is controlled by symtab_node::output_to_lto_symbol_table_p which
> > > has
> > >
> > > /* FIXME: Builtins corresponding to real functions probably should have
> > > symbol table entries. */
> > > if (TREE_CODE (decl) == FUNCTION_DECL && fndecl_built_in_p (decl))
> > > return false;
> > >
> > > we could try to do sth like
> > >
> > > if (TREE_CODE (decl) == FUNCTION_DECL
> > > && (fndecl_built_in_p (decl, BUILT_IN_MD)
> > > || (fndecl_built_in_p (decl, BUILT_IN_NORMAL)
> > > && !associated_internal_fn (decl))))
> > > return false;
> > >
> > > but that would still leave us with too many undefineds I guess
> > > (gcc_unreachable for one).
> > >
> > > We do not currently track builtins that do have a library implementation
> > > (whether that it is used in the end is another thing, but less important).
> > >
> > > What we definitely can do is put a whitelist above like via the following
> > > which also catches the case of definitions of builtins.
> > >
> > > Index: gcc/symtab.c
> > > ===================================================================
> > > --- gcc/symtab.c (revision 273968)
> > > +++ gcc/symtab.c (working copy)
> > > @@ -2375,10 +2375,24 @@ symtab_node::output_to_lto_symbol_table_
> > > first place. */
> > > if (VAR_P (decl) && DECL_HARD_REGISTER (decl))
> > > return false;
> > > +
> > > /* FIXME: Builtins corresponding to real functions probably should have
> > > symbol table entries. */
> > > - if (TREE_CODE (decl) == FUNCTION_DECL && fndecl_built_in_p (decl))
> > > - return false;
> > > + if (TREE_CODE (decl) == FUNCTION_DECL
> > > + && !definition
> > > + && fndecl_built_in_p (decl))
> > > + {
> > > + if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
> > > + switch (DECL_FUNCTION_CODE (decl))
> > > + {
> > > + CASE_FLT_FN (BUILT_IN_ATAN2):
> > > + CASE_FLT_FN (BUILT_IN_SIN):
> > > + return true;
> > > + default:
> > > + break;
> > > + }
> > > + return false;
> > > + }
> > >
> > > /* We have real symbol that should be in symbol table. However try to
> > > trim
> > > down the refernces to libraries bit more because linker will otherwise
> >
> > Hi Richard, no undefineds generated with below code, what's your opinion about
> > the updated code, please? Thanks.
>
> It will break code calling __builtin_unreachable for example since
> we'll emit an UNDEF that cannot be satisfied.
Thanks. I tried to add __builtin_unreachable() in the test case, it can also
works. As BUILT_IN_UNREACHABLE is defined in buitins.def instead of
internal-fn.def, so associated_internal_fn will return IFN_LAST for it, then no
UNDEF of __builtin_unreachable will be emitted to object file.
Most of functions in internal-fn.def are math functions, I am not sure whether
you mean the BUILT_IN_NOP or something else?
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/91287] LTO disables linking with scalar MASS library (Fortran only)
Date: Mon, 05 Aug 2019 07:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91287
--- Comment #32 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 5 Aug 2019, luoxhu at cn dot ibm.com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91287
>
> --- Comment #31 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com> ---
> (In reply to rguenther@suse.de from comment #30)
> > On Fri, 2 Aug 2019, luoxhu at cn dot ibm.com wrote:
> >
> > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91287
> > >
> > > --- Comment #28 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com> ---
> > > (In reply to Richard Biener from comment #24)
> > > > Btw, this is controlled by symtab_node::output_to_lto_symbol_table_p which
> > > > has
> > > >
> > > > /* FIXME: Builtins corresponding to real functions probably should have
> > > > symbol table entries. */
> > > > if (TREE_CODE (decl) == FUNCTION_DECL && fndecl_built_in_p (decl))
> > > > return false;
> > > >
> > > > we could try to do sth like
> > > >
> > > > if (TREE_CODE (decl) == FUNCTION_DECL
> > > > && (fndecl_built_in_p (decl, BUILT_IN_MD)
> > > > || (fndecl_built_in_p (decl, BUILT_IN_NORMAL)
> > > > && !associated_internal_fn (decl))))
> > > > return false;
> > > >
> > > > but that would still leave us with too many undefineds I guess
> > > > (gcc_unreachable for one).
> > > >
> > > > We do not currently track builtins that do have a library implementation
> > > > (whether that it is used in the end is another thing, but less important).
> > > >
> > > > What we definitely can do is put a whitelist above like via the following
> > > > which also catches the case of definitions of builtins.
> > > >
> > > > Index: gcc/symtab.c
> > > > ===================================================================
> > > > --- gcc/symtab.c (revision 273968)
> > > > +++ gcc/symtab.c (working copy)
> > > > @@ -2375,10 +2375,24 @@ symtab_node::output_to_lto_symbol_table_
> > > > first place. */
> > > > if (VAR_P (decl) && DECL_HARD_REGISTER (decl))
> > > > return false;
> > > > +
> > > > /* FIXME: Builtins corresponding to real functions probably should have
> > > > symbol table entries. */
> > > > - if (TREE_CODE (decl) == FUNCTION_DECL && fndecl_built_in_p (decl))
> > > > - return false;
> > > > + if (TREE_CODE (decl) == FUNCTION_DECL
> > > > + && !definition
> > > > + && fndecl_built_in_p (decl))
> > > > + {
> > > > + if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
> > > > + switch (DECL_FUNCTION_CODE (decl))
> > > > + {
> > > > + CASE_FLT_FN (BUILT_IN_ATAN2):
> > > > + CASE_FLT_FN (BUILT_IN_SIN):
> > > > + return true;
> > > > + default:
> > > > + break;
> > > > + }
> > > > + return false;
> > > > + }
> > > >
> > > > /* We have real symbol that should be in symbol table. However try to
> > > > trim
> > > > down the refernces to libraries bit more because linker will otherwise
> > >
> > > Hi Richard, no undefineds generated with below code, what's your opinion about
> > > the updated code, please? Thanks.
> >
> > It will break code calling __builtin_unreachable for example since
> > we'll emit an UNDEF that cannot be satisfied.
>
> Thanks. I tried to add __builtin_unreachable() in the test case, it can also
> works. As BUILT_IN_UNREACHABLE is defined in buitins.def instead of
> internal-fn.def, so associated_internal_fn will return IFN_LAST for it, then no
> UNDEF of __builtin_unreachable will be emitted to object file.
>
> Most of functions in internal-fn.def are math functions, I am not sure whether
> you mean the BUILT_IN_NOP or something else?
OK, so a specific example woul dbe __builtin_clz. IIRC the
DECL_ASSEMBLER_NAME of the functions which have a libgcc fallback is
_not_ the symbol in libgcc (you'd have to double-check).
That said, using associated_internal_fn is probably mostly safe but
not a complete fix since we have builtins like __builtin_strcpy
as well (but of course the C library is always linked).
But I'm fine with an approach that incrementally improves things
here, but without possibly causing link-failures due to bogus
UNDEFs
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/91333] [9/10 Regression] suboptimal register allocation for inline asm
Date: Mon, 05 Aug 2019 08:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91333
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target Milestone|--- |9.2
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/91341] Missing AVX Intrinsics: load/store u2
Date: Mon, 05 Aug 2019 08:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91341
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Aug 5 08:00:30 2019
New Revision: 274109
URL: https://gcc.gnu.org/viewcvs?rev=274109&root=gcc&view=rev
Log:
PR target/91341
* config/i386/avxintrin.h (_mm256_loadu2_m128, _mm256_storeu2_m128,
_mm256_loadu2_m128d, _mm256_storeu2_m128d, _mm256_loadu2_m128i,
_mm256_storeu2_m128i): New function.
* gcc.target/i386/avx-loadu2-m128-1.c: New test.
* gcc.target/i386/avx-loadu2-m128-2.c: New test.
* gcc.target/i386/avx-loadu2-m128d-1.c: New test.
* gcc.target/i386/avx-loadu2-m128d-2.c: New test.
* gcc.target/i386/avx-loadu2-m128i-1.c: New test.
* gcc.target/i386/avx-loadu2-m128i-2.c: New test.
* gcc.target/i386/avx-storeu2-m128-1.c: New test.
* gcc.target/i386/avx-storeu2-m128-2.c: New test.
* gcc.target/i386/avx-storeu2-m128d-1.c: New test.
* gcc.target/i386/avx-storeu2-m128d-2.c: New test.
* gcc.target/i386/avx-storeu2-m128i-1.c: New test.
* gcc.target/i386/avx-storeu2-m128i-2.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/avx-loadu2-m128-1.c
trunk/gcc/testsuite/gcc.target/i386/avx-loadu2-m128-2.c
trunk/gcc/testsuite/gcc.target/i386/avx-loadu2-m128d-1.c
trunk/gcc/testsuite/gcc.target/i386/avx-loadu2-m128d-2.c
trunk/gcc/testsuite/gcc.target/i386/avx-loadu2-m128i-1.c
trunk/gcc/testsuite/gcc.target/i386/avx-loadu2-m128i-2.c
trunk/gcc/testsuite/gcc.target/i386/avx-storeu2-m128-1.c
trunk/gcc/testsuite/gcc.target/i386/avx-storeu2-m128-2.c
trunk/gcc/testsuite/gcc.target/i386/avx-storeu2-m128d-1.c
trunk/gcc/testsuite/gcc.target/i386/avx-storeu2-m128d-2.c
trunk/gcc/testsuite/gcc.target/i386/avx-storeu2-m128i-1.c
trunk/gcc/testsuite/gcc.target/i386/avx-storeu2-m128i-2.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/avxintrin.h
trunk/gcc/testsuite/ChangeLog
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/91347] [7/8/9/10 Regression] pointer_string in linux vsprintf.c is miscompiled when sibling calls are optimized
Date: Mon, 05 Aug 2019 08:04:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Target Milestone|--- |7.5
Summary|[7,8,9 Regression] |[7/8/9/10 Regression]
|pointer_string in linux |pointer_string in linux
|vsprintf.c is miscompiled |vsprintf.c is miscompiled
|when sibling calls are |when sibling calls are
|optimized |optimized
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Subject: [Bug c/91348] Missed optimization: not passing hidden pointer but copying memory
Date: Mon, 05 Aug 2019 08:05:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-05
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
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From: "fiesh at zefix dot tv" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91351] New: -fstrict-enums generates incorrect code
Date: Mon, 05 Aug 2019 08:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91351
Bug ID: 91351
Summary: -fstrict-enums generates incorrect code
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fiesh at zefix dot tv
Target Milestone: ---
The following code results in different runtime behavior depending on whether
it is compiled with -fstrict-enums or not:
#include <iostream>
enum E { e0, e1, e2, e3, e4, e5, e6, e7, e8, e9, e10, e11, e12, e13, e14, e15,
e16, e17, e18, e19, e20, e21, e22, e23, e24, e25 };
void g()
{
std::cout << "e11 || e12 || e13\n";
}
void j()
{
std::cout << "default\n";
}
void f(E e)
{
switch (e) {
case e11:
case e12:
case e13: g(); break;
case e24: break;
case e14:
case e15: break;
default: j(); break;
}
}
int main()
{
volatile const E e{e3};
f(e);
}
(The volatile is necessary to prevent optimization.)
Without -fstrict-enums: "default"
With -fstrict-enums: "e11 || e12 || e13"
Bisecting this behavior says the first bad commit is
37db4f8d72cfc87716a729b38aa2f42097cdbf1f
Also see
https://godbolt.org/z/NmlKXq
for the generated assembly.
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Subject: [Bug driver/91352] New: Jobserver detection uses fcntl, which is not available on mingw-w64
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91352
Bug ID: 91352
Summary: Jobserver detection uses fcntl, which is not available
on mingw-w64
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: pexu@gcc-bugzilla.mail.kapsi.fi
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Hi.
driver::detect_jobserver() et. al. now use fcntl() and `F_GETFD' to determine
status of a jobserver.
However, this implementation unfortunately breaks mingw-w64 cross compiler
builds, as fcntl() is not available on MinGW. While `fcntl.h' exists, and is
properly detected by the configure script, it misses many of the POSIX file
control options. Perhaps a similar check that is currently done for `F_SETLKW'
should be also done for `F_GETFD'.
>From gcc-bugs-return-650258-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 08:42:03 2019
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Subject: [Bug c++/91351] -fstrict-enums generates incorrect code
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--- Comment #1 from fiesh at zefix dot tv ---
commit 37db4f8d72cfc87716a729b38aa2f42097cdbf1f
Author: glisse <glisse@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue Oct 2 14:55:39 2018 +0000
No a*x+b*x factorization for signed vectors
2018-10-02 Marc Glisse <marc.glisse@inria.fr>
PR middle-end/87319
* fold-const.c (fold_plusminus_mult_expr): Handle complex and
vectors.
* tree.c (signed_or_unsigned_type_for): Handle complex.
>From gcc-bugs-return-650259-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 08:47:43 2019
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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/91287] LTO disables linking with scalar MASS library (Fortran only)
Date: Mon, 05 Aug 2019 08:47:00 -0000
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--- Comment #33 from Kewen Lin <linkw at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #27)
> On Fri, 2 Aug 2019, linkw at gcc dot gnu.org wrote:
>
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91287
> >
> > Kewen Lin <linkw at gcc dot gnu.org> changed:
> >
> > What |Removed |Added
> > ----------------------------------------------------------------------------
> > CC| |linkw at gcc dot gnu.org
> >
> > --- Comment #26 from Kewen Lin <linkw at gcc dot gnu.org> ---
> > > The odd thing is that if you omit libfoo1.so then it will consider
> > > libfoo.a later but not when it can resolve from libfoo1.so.
> > >
> > > That's a bit inconsistent but arguably the bug is with GCCs
> > > symbol table creation of the LTO IR.
> >
> > Do we have option to dump the actual final linking command to link all ltrans
> > objects? I can only see the command to generate ltrans object with as. Is it
> > possible a library order issue in final linking?
>
> The ld invocation for the final link is the same as the one spawning the
> LTO WPA and LTRANS phases - the LTO plugin feeds back extra objects
> for the re-link done by the very same ld process.
>
> Not sure if ld prints anything like an "effective final link command"
> when adding verbosity (try -Wl,-v -Wl,-debug etc.).
>
> So - there isn't something like a "final linking command" and the final
> linking approach also differs from BFD and gold for example.
Thanks Richard! My local repo is old and doesn't pick up commit r271202 which
respects save-temps to save output objects after LTRANS. The linking process
with plugin is quite different from my stale knowledge on general lto linking,
as you mentioned the objects out from LTRANS are fed back into the linking
process by using plugin/ld interface.
This issue seems use-linker-plugin only, I disabled it by
-fno-use-linker-plugin and got the expected result, but it will miss all
befenits from tight integration with ld. It's bad and just a workaround try.
Another workaround with -Wl,--whole-archive -lmass -Wl,--no-whole-archive
is also not practical due to code bloat and possible cache impact etc.
>From gcc-bugs-return-650260-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 08:48:50 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/91201] [7/8/9/10 Regression] SIMD not generated for horizontal sum of bytes in array
Date: Mon, 05 Aug 2019 08:48:00 -0000
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--- Comment #24 from Joel Yliluoma <bisqwit at iki dot fi> ---
The simple horizontal 8-bit add seems to work nicely. Very nice work.
However, the original bug report — that the code snippet quoted below no longer
receives love from the SIMD optimization unless you explicitly say “pragma #omp
simd†— seems still unaddressed.
#define num_words 2
typedef unsigned long long E;
E bytes[num_words];
unsigned char sum()
{
E b[num_words] = {};
//#pragma omp simd
for(unsigned n=0; n<num_words; ++n)
{
// Calculate the sum of all bytes in a word
E temp = bytes[n];
temp += (temp >> 32);
temp += (temp >> 16);
temp += (temp >> 8);
// Save that number in an array
b[n] = temp;
}
// Calculate sum of those sums
unsigned char result = 0;
//#pragma omp simd
for(unsigned n=0; n<num_words; ++n) result += b[n];
return result;
}
Compiler Explorer link: https://godbolt.org/z/XL3cIK
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Subject: [Bug rtl-optimization/91332] ICE: Segfault in gfortran when compiling massive subroutine with -O3
Date: Mon, 05 Aug 2019 08:49:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |compile-time-hog
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-05
Component|fortran |rtl-optimization
Ever confirmed|0 |1
Known to fail| |7.4.1, 9.1.1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Try increasing an eventually present stack limit (ulimit -s unlimited). OTOH
trying to reprodce I see the compile uses >7GB of memory and the stack is
still <16MB. Later memory usage climbs beyond my machines 32GB memory and
the process is killed...
The testcase somewhat resembles that of PR46590? That is, it is a sequence
of many single-nested loops. Trimming the number down to 1000 shows
load CSE after reload : 54.39 (78%) usr 0.00 ( 0%) sys 54.39 (77%) wall
274 kB ( 0%) ggc
TOTAL : 69.30 0.95 70.26
330192 kB
for GCC 7 and
dead store elim1 : 8.89 ( 13%) 0.36 ( 36%) 9.26 ( 14%)
1317578 kB ( 36%)
dead store elim2 : 16.29 ( 25%) 0.21 ( 21%) 16.51 ( 25%)
2195108 kB ( 60%)
load CSE after reload : 23.78 ( 36%) 0.00 ( 0%) 23.79 ( 35%)
0 kB ( 0%)
TOTAL : 66.06 1.00 67.20
3672823 kB
103.00user 1.40system 1:44.42elapsed 99%CPU (0avgtext+0avgdata
2465980maxresident)k
0inputs+2208outputs (0major+616413minor)pagefaults 0swaps
for GCC 9. Upping to 2000 loops makes the above (GCC 9)
forward prop : 21.74 ( 12%) 0.01 ( 1%) 21.74 ( 11%)
9208 kB ( 0%)
dead store elim1 : 16.92 ( 9%) 0.63 ( 35%) 17.54 ( 9%)
2670613 kB ( 37%)
dead store elim2 : 28.27 ( 15%) 0.36 ( 20%) 28.62 ( 15%)
4321137 kB ( 59%)
load CSE after reload : 95.49 ( 51%) 0.00 ( 0%) 95.50 ( 50%)
0 kB ( 0%)
TOTAL : 188.82 1.78 190.61
7300901 kB
188.82user 1.94system 3:10.77elapsed 99%CPU (0avgtext+0avgdata
4846972maxresident)k
0inputs+4304outputs (0major+1222407minor)pagefaults 0swaps
so it really seems to be all RTL-land.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/91349] [9 regression] powerpc*-*-freebsd* defines _GNU_SOURCE
Date: Mon, 05 Aug 2019 09:04:00 -0000
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Alan Modra from comment #1)
> Huh, it looks like I missed adding the following to freebsd64.h:
>
> #undef CPLUSPLUS_CPP_SPEC
> #undef LINK_GCC_C_SEQUENCE_SPEC
Which of course only works if those are only set by gnu-user.h and are never
used for something else that freebsd.h and freebsd64.h *do* want.
Wouldn't it have been cleaner to split gnu_user.h into the non-GNU parts (that
you want for powerpc) and the GNU parts (only relevant to actual GNU userspace
targets) and so not include gnu_user.h on irrelevant targets?
The current solution seems klugy and fragile.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91353] New: Implement P1331R2: Permitting trivial default initialization in constexprcontexts
Date: Mon, 05 Aug 2019 09:11:00 -0000
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Bug ID: 91353
Summary: Implement P1331R2: Permitting trivial default
initialization in constexprcontexts
Product: gcc
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Out of curiousity, I've played with this a little bit.
Given
constexpr int
foo (int x)
{
int a;
a = 5;
return x + a;
}
static_assert (foo (2) == 7);
constexpr int
bar (int x)
{
const int a; // { dg-error "" }
constexpr int b; // { dg-error "" }
return x;
}
constexpr int
baz (int x)
{
int a;
return x + a; // { dg-error "" }
}
constexpr int a = baz (5);
constexpr int
qux ()
{
struct S { int a = -5; int b; } s;
return s.a;
}
static_assert (qux () == -5);
constexpr int
quux ()
{
struct S { int a = 9; int b; } s;
return s.b; // { dg-error "" }
}
constexpr int b = quux ();
the following patch doesn't diagnose the quux bug of using uninitialized s.b.
For some reason CONSTRUCTOR_NO_CLEARING is not set and thus we value-initialize
instead of diagnosing.
--- gcc/cp/decl.c.jj 2019-08-05 09:58:07.713491022 +0200
+++ gcc/cp/decl.c 2019-08-05 10:22:28.534127984 +0200
@@ -5742,8 +5742,10 @@ check_for_uninitialized_const_var (tree
7.1.6 */
if (VAR_P (decl)
&& !TYPE_REF_P (type)
- && (constexpr_context_p
- || CP_TYPE_CONST_P (type) || var_in_constexpr_fn (decl))
+ && (CP_TYPE_CONST_P (type)
+ || (cxx_dialect < cxx2a
+ && (constexpr_context_p
+ || var_in_constexpr_fn (decl))))
&& !DECL_NONTRIVIALLY_INITIALIZED_P (decl))
{
tree field = default_init_uninitialized_part (type);
@@ -5752,7 +5754,7 @@ check_for_uninitialized_const_var (tree
bool show_notes = true;
- if (!constexpr_context_p)
+ if (!constexpr_context_p || cxx_dialect >= cxx2a)
{
if (CP_TYPE_CONST_P (type))
{
--- gcc/cp/constexpr.c.jj 2019-08-05 09:57:55.147683227 +0200
+++ gcc/cp/constexpr.c 2019-08-05 10:51:56.954215860 +0200
@@ -814,13 +814,15 @@ cx_check_missing_mem_inits (tree ctype,
continue;
if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
{
- /* Recurse to check the anonummous aggregate member. */
+ /* Recurse to check the anonymous aggregate member. */
bad |= cx_check_missing_mem_inits
(TREE_TYPE (field), NULL_TREE, complain);
if (bad && !complain)
return true;
continue;
}
+ if (cxx_dialect >= cxx2a)
+ continue;
ftype = strip_array_types (TREE_TYPE (field));
if (type_has_constexpr_default_constructor (ftype))
{
@@ -6617,8 +6619,9 @@ potential_constant_expression_1 (tree t,
"%<thread_local%> in %<constexpr%> context", tmp);
return false;
}
- else if (!check_for_uninitialized_const_var
- (tmp, /*constexpr_context_p=*/true, flags))
+ else if (cxx_dialect < cxx2a
+ && !check_for_uninitialized_const_var
+ (tmp, /*constexpr_context_p=*/true, flags))
return false;
}
return RECUR (tmp, want_rval);
--- gcc/cp/method.c.jj 2019-05-20 23:33:13.818084173 +0200
+++ gcc/cp/method.c 2019-08-05 10:46:07.057545848 +0200
@@ -1410,7 +1410,9 @@ walk_field_subobs (tree fields, special_
/* For an implicitly-defined default constructor to be constexpr,
every member must have a user-provided default constructor or
an explicit initializer. */
- if (constexpr_p && !CLASS_TYPE_P (mem_type)
+ if (constexpr_p
+ && cxx_dialect < cxx2a
+ && !CLASS_TYPE_P (mem_type)
&& TREE_CODE (DECL_CONTEXT (field)) != UNION_TYPE)
{
*constexpr_p = false;
Not really sure with the removal of diagnostics for constexpr ctors not
initializing all non-static data members for -std=c++2a, shall we diagnose
somewhere else if a const or constexpr variable is initialized with such a
constructor? And part of this change shall be bumping for cxx_dialect >= cxx2a
of __cpp_constexpr value.
>From gcc-bugs-return-650265-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 09:35:41 2019
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Subject: [Bug debug/82738] [meta-bug] issues with the -Og optimization level
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Bug 82738 depends on bug 86638, which changed state.
Bug 86638 Summary: Og guality failures without -ftree-sra
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86638
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-650264-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 09:35:40 2019
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Subject: [Bug debug/86638] Og guality failures without -ftree-sra
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |rsandifo at gcc dot gnu.org
Resolution|--- |FIXED
--- Comment #6 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Fixed on trunk (a while ago... thanks Eric for the reminder :-))
>From gcc-bugs-return-650266-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 09:36:45 2019
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Subject: [Bug c++/91351] -fstrict-enums generates incorrect code
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-05
CC| |glisse at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
AKA r264790
-O2 or -O3 is required to demonstrate the bug.
Further reduced:
extern "C" int puts(const char*);
enum E { e0, e1, e2, e3, e4, e5, e6, e7, e8, e9, e10, e11, e12, e13, e14, e15,
e16, e17, e18, e19, e20, e21, e22, e23, e24, e25 };
void g()
{
puts("e11 || e12 || e13");
}
void j()
{
puts("default");
}
void f(E e)
{
switch (e) {
case e11:
case e12:
case e13: g(); break;
case e24: break;
case e14:
case e15: break;
default: j(); break;
}
}
int main()
{
volatile const E e{e3};
f(e);
}
>From gcc-bugs-return-650267-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 09:50:03 2019
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Subject: [Bug c++/91335] False positive "unused variable" warning with variable initialized in 'if' condition
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
You can still do that without a named variable:
if (static_cast<int*>(foo())) {
return 1;
}
>From gcc-bugs-return-650268-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 10:00:00 2019
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Subject: [Bug c++/91335] False positive "unused variable" warning with variable initialized in 'if' condition
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--- Comment #4 from Andreas Schwab <schwab@linux-m68k.org> ---
Or add a conversion to bool that does the right thing?
>From gcc-bugs-return-650269-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 10:14:45 2019
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Subject: [Bug target/91340] Missing AVX and AVX512 Intrinsics: Zero-Extension
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl.tools at gmail dot com,
| |jakub at gcc dot gnu.org,
| |uros at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I've tried both:
extern __inline __m256d __attribute__((__gnu_inline__, __always_inline__,
__artificial__))
_mm256_zextpd128_pd256 (__m128d __A)
{
return _mm256_insertf128_pd (_mm256_castpd128_pd256 (__A), _mm_setzero_pd (),
1);
}
extern __inline __m256d __attribute__((__gnu_inline__, __always_inline__,
__artificial__))
_mm256_zextpd128_pd256 (__m128d __A)
{
return (__m256d) __builtin_shuffle (_mm256_castpd128_pd256 (__A),
_mm256_setzero_pd (),
(__v4di) { 0, 1, 4, 5 });
}
both generate vpxor + vinsert[fi]128. In both cases, the problem is that
vec_set_lo_<mode> patterns use register_operand/"v" for the operand from which
the upper bits are taken, while in this case we want const0_operand/"C" and
then use vmovapd etc. To be totally instruction-less, we'd need to analyze
whatever instruction generated the operand and verify if it clears the upper
bits or not, while that might be ok for certain special cases, doing it for
everything is going to be way too hard, because often how exactly we represent
it in the RTL still doesn't imply how exactly it is implemented. In
vec_set_lo_<mode> patterns it isn't easy to add that alternative though,
because the instruction supports masking and for masking the vmovaps etc. with
narrower operands works differently.
>From gcc-bugs-return-650270-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 11:25:42 2019
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Subject: [Bug c++/91351] [9/10 Regression] -fstrict-enums generates incorrect code
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Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC|glisse at gcc dot gnu.org |
--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
Switch lowering produces things like
_6 = e_2(D) + 4294967285;
if (_6 > 2)
for range checking, where _6 has type enum E, and VRP2 later takes advantage of
strict enum to assume that _6 cannot be large. It seems like the range check
should use a type that is not an enum.
(the bisection result makes little sense to me)
>From gcc-bugs-return-650271-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 11:26:38 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/91354] New: verify_gimple triggers ICE after reporting 'invalid types in nop conversion' error for avr target
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Bug ID: 91354
Summary: verify_gimple triggers ICE after reporting 'invalid
types in nop conversion' error for avr target
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: saaadhu at gcc dot gnu.org
Target Milestone: ---
For the avr target, compiling the below code causes an 'invalid types in nop
conversion' error, followed by a ICE at 'verify-gimple'
With gdb
(gdb) bt
#0 verify_gimple_assign_unary (stmt=0x7ffff7ae96e0) at
/home/saaadhu/code/work/gcc/gcc/tree-cfg.c:3579
#1 0x000000000107ce85 in verify_gimple_assign (stmt=0x7ffff7ae96e0) at
/home/saaadhu/code/work/gcc/gcc/tree-cfg.c:4612
#2 0x000000000107dd59 in verify_gimple_stmt (stmt=0x7ffff7ae96e0) at
/home/saaadhu/code/work/gcc/gcc/tree-cfg.c:4877
#3 0x000000000107e333 in verify_gimple_in_seq_2 (stmts=0x7ffff7ae9690) at
/home/saaadhu/code/work/gcc/gcc/tree-cfg.c:5039
#4 0x000000000107e44b in verify_gimple_in_seq (stmts=0x7ffff7ae9690) at
/home/saaadhu/code/work/gcc/gcc/tree-cfg.c:5078
#5 0x0000000000cb72cc in gimplify_body (fndecl=0x7ffff7ad5100, do_parms=true)
at /home/saaadhu/code/work/gcc/gcc/gimplify.c:14349
#6 0x0000000000cb77d9 in gimplify_function_tree (fndecl=0x7ffff7ad5100) at
/home/saaadhu/code/work/gcc/gcc/gimplify.c:14439
#7 0x0000000000a403ce in cgraph_node::analyze (this=0x7ffff79e62d0) at
/home/saaadhu/code/work/gcc/gcc/cgraphunit.c:667
#8 0x0000000000a41dd6 in analyze_functions (first_time=true) at
/home/saaadhu/code/work/gcc/gcc/cgraphunit.c:1126
#9 0x0000000000a470a4 in symbol_table::finalize_compilation_unit
(this=0x7ffff79e8000) at /home/saaadhu/code/work/gcc/gcc/cgraphunit.c:2840
#10 0x000000000101e43b in compile_file () at
/home/saaadhu/code/work/gcc/gcc/toplev.c:481
#11 0x000000000102110b in do_compile () at
/home/saaadhu/code/work/gcc/gcc/toplev.c:2190
#12 0x0000000001021421 in toplev::main (this=0x7fffffffe0c6, argc=3,
argv=0x7fffffffe1c8) at /home/saaadhu/code/work/gcc/gcc/toplev.c:2325
#13 0x0000000001a92b7c in main (argc=3, argv=0x7fffffffe1c8) at
/home/saaadhu/code/work/gcc/gcc/main.c:39
(gdb) call debug_gimple_stmt(stmt)
x = (long unsigned int) p.0_1;
Appears to be a fallout of PR 85450, which changed ptrofftype_p (sizetype) to
ptrofftype_p (lhs_type)
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85450#c0). In this case, p.0_1
(pointer to __memx address space) is 24 bits wide, and therefore neither LHS
type nor RHS type is ptrofftype_p (sizetype is 16 bits). The code then asserts
both LHS and RHS types are of the same kind, which isn't true - one is a
pointer and the other is integral. This causes the error and I guess the
subsequent ICE.
$ cat test2.c
extern const __memx int *p;
void foo(void) {
unsigned long int x;
x = (unsigned long int) p;
}
$ ./gcc/cc1 test2.c -mmcu=avr51
foo
test2.c: In function 'foo':
test2.c:5:6: warning: cast from pointer to integer of different size
[-Wpointer-to-int-cast]
5 | x = (unsigned long int) p;
| ^
Analyzing compilation unit
test2.c:3:6: error: invalid types in nop conversion
3 | void foo(void) {
| ^~~
long unsigned int
const <address-space-7> int *
x = (long unsigned int) p.0_1;
test2.c:3:6: internal compiler error: 'verify_gimple' failed
0x107e45d verify_gimple_in_seq(gimple*)
/home/saaadhu/code/work/gcc/gcc/tree-cfg.c:5079
0xcb72cb gimplify_body(tree_node*, bool)
/home/saaadhu/code/work/gcc/gcc/gimplify.c:14349
0xcb77d8 gimplify_function_tree(tree_node*)
/home/saaadhu/code/work/gcc/gcc/gimplify.c:14439
0xa403cd cgraph_node::analyze()
/home/saaadhu/code/work/gcc/gcc/cgraphunit.c:667
0xa41dd5 analyze_functions
/home/saaadhu/code/work/gcc/gcc/cgraphunit.c:1126
0xa470a3 symbol_table::finalize_compilation_unit()
/home/saaadhu/code/work/gcc/gcc/cgraphunit.c:2840
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-650272-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 11:52:43 2019
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From: "j.schleicher at pilz dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/91327] non-reproducible Internal Compiler Error
Date: Mon, 05 Aug 2019 11:52:00 -0000
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j.schleicher at pilz dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |INVALID
--- Comment #4 from j.schleicher at pilz dot de ---
Indeed. Memtest finds several thousand errors.
Thank you and sorry for the noise. Closing.
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From: "fiesh at zefix dot tv" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91351] [9/10 Regression] -fstrict-enums generates incorrect code
Date: Mon, 05 Aug 2019 11:59:00 -0000
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--- Comment #4 from fiesh at zefix dot tv ---
Yeah, it seems the "bad commit" just somehow triggered this behavior.
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Subject: [Bug tree-optimization/91169] [10 regression] cd2a31a FAILs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug tree-optimization/91169] [10 regression] cd2a31a FAILs
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--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Aug 5 12:30:49 2019
New Revision: 274114
URL: https://gcc.gnu.org/viewcvs?rev=274114&root=gcc&view=rev
Log:
2019-08-05 Richard Biener <rguenther@suse.de>
PR middle-end/91169
* fold-const.c (get_array_ctor_element_at_index): Create
offset_ints according to the sign of the index type and treat
that as signed if it is obviously so.
* gnat.dg/array37.adb: New testcase.
Added:
trunk/gcc/testsuite/gnat.dg/array37.adb
Modified:
trunk/gcc/ChangeLog
trunk/gcc/fold-const.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-650276-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 12:39:42 2019
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Subject: [Bug target/91349] [9 regression] powerpc*-*-freebsd* defines _GNU_SOURCE
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--- Comment #6 from Alan Modra <amodra at gmail dot com> ---
> Wouldn't it have been cleaner to split gnu_user.h
I agree. Please do.
>From gcc-bugs-return-650277-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 12:44:02 2019
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From: "rupprecht at cipsoft dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91355] New: optimized code does not call destructor while unwinding after exception
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Bug ID: 91355
Summary: optimized code does not call destructor while
unwinding after exception
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rupprecht at cipsoft dot com
Target Milestone: ---
Created attachment 46671
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46671&action=edit
Example code triggering the bug.
Compile command:
g++ -std=c++11 -O2 code.cpp
The optimized code generated by gcc does not call the destructor of the
automatic variable after throwing an exception. To trigger this bug,
compilation with -O2 optimization is necessary (-O1 does not suffice).
Moreover, the affected function must have a throw declaration.
The attached program should output "0", but it prints "1".
Tests with the compilers at godbolt.org revealed that the bug occurs from gcc
8.0 through gcc trunk. The bug does not occur up to gcc 7.4
Link to godbolt:
https://godbolt.org/z/IEWmYA
System: CentOS 7.6 (devtoolset-8)
gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/opt/rh/devtoolset-8/root/usr/libexec/gcc/x86_64-redhat-linux/8/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap
--enable-languages=c,c++,fortran,lto --prefix=/opt/rh/devtoolset-8/root/usr
--mandir=/opt/rh/devtoolset-8/root/usr/share/man
--infodir=/opt/rh/devtoolset-8/root/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared
--enable-threads=posix --enable-checking=release --enable-multilib
--with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions
--enable-gnu-unique-object --enable-linker-build-id
--with-gcc-major-version-only --with-linker-hash-style=gnu
--with-default-libstdcxx-abi=gcc4-compatible --enable-plugin
--enable-initfini-array
--with-isl=/builddir/build/BUILD/gcc-8.3.1-20190311/obj-x86_64-redhat-linux/isl-install
--disable-libmpx --enable-gnu-indirect-function --with-tune=generic
--with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix
gcc version 8.3.1 20190311 (Red Hat 8.3.1-3) (GCC)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hrm, may want to fix this for 9.2?
>From gcc-bugs-return-650279-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 12:53:39 2019
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Subject: [Bug c++/91334] [10 Regression] ICE in propagate_necessity at gcc/tree-ssa-dce.c:813 since r273791
Date: Mon, 05 Aug 2019 12:53:00 -0000
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Mon Aug 5 12:53:01 2019
New Revision: 274115
URL: https://gcc.gnu.org/viewcvs?rev=274115&root=gcc&view=rev
Log:
Handle new operators with no arguments in DCE.
2019-08-05 Martin Liska <mliska@suse.cz>
PR c++/91334
* tree-ssa-dce.c (propagate_necessity): Handle new operators
with not arguments.
(eliminate_unnecessary_stmts): Likewise.
2019-08-05 Martin Liska <mliska@suse.cz>
PR c++/91334
* g++.dg/torture/pr91334.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/torture/pr91334.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-dce.c
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Subject: [Bug c++/91334] [10 Regression] ICE in propagate_necessity at gcc/tree-ssa-dce.c:813 since r273791
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed now.
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Subject: [Bug other/91085] fixincludes breaks <bits/statx.h>
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
IMHO not needed for 9.2, glibc will just behave as it used to be ever before
with this header. I'd say let's fix it in on the trunk, let's fix PR80005 and
then we can talk about backporting.
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Subject: [Bug tree-optimization/91351] [9/10 Regression] -fstrict-enums generates incorrect code
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Indeed - that looks like an issue we need to fix.
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Subject: [Bug bootstrap/91352] [10 Regression] Jobserver detection uses fcntl, which is not available on mingw-w64
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |build, lto
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CC| |marxin at gcc dot gnu.org
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Target Milestone|--- |10.0
Summary|Jobserver detection uses |[10 Regression] Jobserver
|fcntl, which is not |detection uses fcntl, which
|available on mingw-w64 |is not available on
| |mingw-w64
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Subject: [Bug middle-end/91354] verify_gimple triggers ICE after reporting 'invalid types in nop conversion' error for avr target
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think elsewhere I proposed the "proper" checking involving
POINTERS_EXTEND_UNSIGNED and checking for ptr_mode <-> Pmode/word_mode
but that doesn't cover memory address-spaces with different modes
since there we do not know whether to sign- or zero-extend.
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Subject: [Bug tree-optimization/91351] [9/10 Regression] -fstrict-enums generates incorrect code
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
I can take a look.
>From gcc-bugs-return-650286-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 13:23:07 2019
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Subject: [Bug bootstrap/91352] [10 Regression] Jobserver detection uses fcntl, which is not available on mingw-w64
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Sorry for the breakage, I'll take a look.
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Subject: [Bug c++/91355] [8/9/10 Regression] optimized code does not call destructor while unwinding after exception
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91355
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |7.4.0
Version|8.0 |8.2.1
Keywords| |wrong-code
Last reconfirmed| |2019-08-05
Ever confirmed|0 |1
Summary|optimized code does not |[8/9/10 Regression]
|call destructor while |optimized code does not
|unwinding after exception |call destructor while
| |unwinding after exception
Target Milestone|--- |8.4
Known to fail| |8.3.0, 9.1.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-650288-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 13:27:09 2019
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Subject: [Bug c++/91355] [8/9/10 Regression] optimized code does not call destructor while unwinding after exception
Date: Mon, 05 Aug 2019 13:27:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
>From gcc-bugs-return-650289-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 13:35:11 2019
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From: "danglin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/91347] [7/8/9/10 Regression] pointer_string in linux vsprintf.c is miscompiled when sibling calls are optimized
Date: Mon, 05 Aug 2019 13:35:00 -0000
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--- Comment #1 from John David Anglin <danglin at gcc dot gnu.org> ---
The uses on the call insn seem okay (i.e., they have mem:BLK for spec):
(call_insn/j 53 52 0 5 (parallel [
(set (reg:SI 28 %r28)
(call (mem:SI (symbol_ref/v:SI ("@number") [flags 0x203]
<function_decl 0xf6898bb8 number>) [0 number S4 A32])
(const_int 24 [0x18])))
(clobber (reg:SI 1 %r1))
(use (reg:SI 2 %r2))
(use (const_int 0 [0]))
]) "/home/svens/linux-kernel/parisc-linux/src/lib/vsprintf.c":682 217
{sibcall_value_internal_symref}
(expr_list:REG_DEAD (reg:SI 26 %r26)
(expr_list:REG_DEAD (reg:SI 25 %r25)
(expr_list:REG_DEAD (reg:SI 2 %r2)
(expr_list:REG_DEAD (reg:DI 23 %r23)
(expr_list:REG_CALL_DECL (symbol_ref/v:SI ("@number")
[flags 0x203] <function_decl 0xf6898bb8 number>)
(expr_list:REG_EH_REGION (const_int 0 [0])
(nil)))))))
(expr_list:SI (use (reg:SI 26 %r26))
(expr_list:SI (use (reg:SI 25 %r25))
(expr_list:DI (use (reg:DI 23 %r23))
(expr_list:BLK (use (mem:BLK (plus:SI (reg/f:SI 3 %r3)
(const_int -56 [0xffffffffffffffc8])) [0 S8
A64]))
(nil))))))
>From gcc-bugs-return-650290-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 13:38:42 2019
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Subject: [Bug rtl-optimization/91154] [10 Regression] 456.hmmer regression on Haswell caused by r272922
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|x86_64-*-* |x86_64-*-* powerpc*-*-*
CC| |wschmidt at gcc dot gnu.org
--- Comment #17 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
We're going to need a fix for Power as well. We see a 12% drop in 456.hmmer
around July 2. We lose vectorization and end up with a couple of isel's in the
loop (equivalent to x86 cmov).
>From gcc-bugs-return-650291-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 13:46:05 2019
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Subject: [Bug rtl-optimization/91154] [10 Regression] 456.hmmer regression on Haswell caused by r272922
Date: Mon, 05 Aug 2019 13:46:00 -0000
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--- Comment #18 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Richi corrected me -- this is not vectorization, but use of SSE on lane zero to
do scalar computation.
>From gcc-bugs-return-650292-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 13:46:23 2019
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Subject: [Bug c++/91353] Implement P1331R2: Permitting trivial default initialization in constexpr contexts
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-05
Ever confirmed|0 |1
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Subject: [Bug tree-optimization/91240] [8/9/10 Regression] Wrong code with -O3 due to unroll and jam pass
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Michael Matz <matz at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |matz at gcc dot gnu.org
--- Comment #2 from Michael Matz <matz at gcc dot gnu.org> ---
Mine.
>From gcc-bugs-return-650294-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 14:22:20 2019
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91355] [8/9/10 Regression] optimized code does not call destructor while unwinding after exception
Date: Mon, 05 Aug 2019 14:22:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|needs-bisection |
CC| |hubicka at gcc dot gnu.org
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:
extern "C" int printf(const char*, ...);
unsigned int Depth = 0;
class Bar {
public:
Bar() { Depth++; }
~Bar() { Depth--; }
};
void Foo(int i) throw(int)
{
if (i == 0) {
throw 3;
}
Bar Depth;
throw 3;
}
int main()
{
try {
Foo(1);
} catch (...) {
}
printf("%u\n", Depth);
return 0;
}
Behaviour changed with r254698:
* tree-ssa-sink.c (select_best_block): Do not use frequencies.
>From gcc-bugs-return-650295-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 14:28:21 2019
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From: "nisse at lysator dot liu.se" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/91356] New: Poor optimization of calls involving std::unique_ptr
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Bug ID: 91356
Summary: Poor optimization of calls involving std::unique_ptr
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
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Target Milestone: ---
The naïve understanding of unique_ptr, is that it is handled the same
way as a raw pointer, with just
* additional compile time safety checks, and
* automatic runtime calls to delete whenever a non-null unique_ptr
goes out of scope.
However, the calling convention for unique_ptr implies a *lot* more
overhead than passing a raw pointer. For a start, a unique_ptr is not
passed in a register, but by "invisible reference". To make things
worse, the invisible reference refers to a temporary object that the
caller is responsible for destroying.
Consider a function just passing on a unique_ptr:
void bar(std::unique_ptr<int> p);
void baz(std::unique_ptr<int> p) { bar(std::move(p)); }
This compiles (with g++-8 -O3 --fno-exceptions, on gnu/linux x86_64)
to
_Z3bazSt10unique_ptrIiSt14default_deleteIiEE:
subq $24, %rsp
movq (%rdi), %rax
movq $0, (%rdi)
leaq 8(%rsp), %rdi
movq %rax, 8(%rsp)
call _Z3barSt10unique_ptrIiSt14default_deleteIiEE@PLT
movq 8(%rsp), %rdi
testq %rdi, %rdi
je .L6
movl $4, %esi
call _ZdlPvm@PLT
.L6:
addq $24, %rsp
ret
As I read this, the steps are
1. Allocate a new temporary unique_ptr on the stack.
2. Move-construct it from the input argument (pointed to by %rdi).
3. Put the address of the object in %rdi, and invoke the bar function.
4. Destroy the temporary object, including a null test and a branch,
and a call to the destructor of the underlying type if appropriate.
This can be compared to the raw pointer version,
void bar(int* p);
void baz(int* p) { bar(p); }
which compiles to a single jump instruction:
_Z3bazPi:
jmp _Z3barPi@PLT
As far as I understand, it's not possible to really fix this in just
the compiler or library, it's also an ABI issue. I see two somewhat
independent things needed to make the calling convention for
unique_ptr more efficient:
1. Move responsibility for destructing the temporary object from
caller to callee. This is particularly nice for unique_ptr, since
the callee often knows statically that the unique_ptr is null when
going out of scope, and then both the null test and the destructor
call should be optimized away completely. I don't fully understand
C++ rules on destruction order, but I've been told that
callee-destruction is allowed by the language specification (and
used in the i386-pc-win32 abi). It's less clear if a forwarding
function like baz(std::unique_ptr<int> p) can delegate
responsibility further.
2. Make it possible to pass small objects in registers, even if they
have a non-trivial destructor or copy-constructor. In particular,
invoke the unique_ptr destructor with the object to be destructed
in a register.
The callee may then need to move the object to memory if it for any
reason needs a pointer to it. To allow that move, one may need
something like a "relocatable" property,
https://quuxplusone.github.io/draft/d1144-object-relocation.html, or
https://en.cppreference.com/w/cpp/language/attributes/no_unique_address
>From gcc-bugs-return-650296-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 15:01:21 2019
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Subject: [Bug c++/91353] Implement P1331R2: Permitting trivial default initialization in constexpr contexts
Date: Mon, 05 Aug 2019 15:01:00 -0000
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Note, I won't have time soon to work on this further, so if anyone wants to
take it over, reusing or not reusing the above patch, feel free.
>From gcc-bugs-return-650297-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 15:06:56 2019
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Subject: [Bug c++/82380] [concepts] Error when using requires constraint with attributes
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Mateusz Pusz <mateusz.pusz at gmail dot com> changed:
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--- Comment #3 from Mateusz Pusz <mateusz.pusz at gmail dot com> ---
Casey's workaround works but it is a workaround. It would be nice to fix it for
C++20 concepts.
>From gcc-bugs-return-650298-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 15:11:59 2019
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From: "kosotiro at yahoo dot gr" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/91312] -Wconversion warning with += operator
Date: Mon, 05 Aug 2019 15:11:00 -0000
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--- Comment #7 from Kostas Sotiropoulos <kosotiro at yahoo dot gr> ---
(In reply to Andrew Pinski from comment #5)
> (In reply to Kostas Sotiropoulos from comment #4)
> > Any comments on my questions?
>
> Yes go read the c standard about prompting to int here.
I had checked the standard from the following link:
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf
I suppose that you mean the following two sections that cover our case:
6.5.16.2
A compound assignment of the form E1 op=E2 is equivalent to the simple
assignment expression E1 = E1 op (E2), except that the lvalue E1
is evaluated only once, and with respect to an indeterminately-sequenced
function call, the operation of a compound assignment is a single
evaluation.
6.3.1.1 Boolean, characters, and integers
2 The following may be used in an expression wherever an int or unsigned int
may be used:
— An object or expression with an integer type (other than int
or unsigned int) whose integer conversion rank is less than or
equal to the rank of int and unsigned int.
— A bit-field of type _Bool, int, signed int, or unsigned int.
If an int can represent all values of the original type
(as restricted by the width, for a bit-field), the value is
converted to an int; otherwise, it is converted to an unsigned int.
These are called the integer promotions. All other types are
unchanged by the integer promotions.
So considering the above two sections, if we even cast
i += (unsigned char) MACRO then this would be equal to
i = i + (unsigned char) MACRO.
But, what if I want to avoid this warning then the only way to get
rid of it is the following way?
i = (unsigned char) (i + MACRO).
But we will lose on code optimization be this way, do not we? Especially
when we are talking about Embedded Systems software.
Please note that the same code snippet passes through clang compiler (clang
version 3.8.1-24) without any warning when -Werror=conversion is used during
compilation. I suppose that even this compiler follows C standard. In my
opinion such kind of warnings are false positives that should not be reported
from gcc compiler too.
Maybe a change of this kind on gcc compiler opens the Pandora's Box for other
things but someone should not avoid of defining MACROS and use them on compound
statements (+=, -=, *= etc) and sacrifice code optimization by expanding them.
Waiting for your comments.
>From gcc-bugs-return-650299-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 15:21:02 2019
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Subject: [Bug libstdc++/91357] New: _GLIBCXX_ASSERTIONS rejects possibly-valid code
Date: Mon, 05 Aug 2019 15:21:00 -0000
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Bug ID: 91357
Summary: _GLIBCXX_ASSERTIONS rejects possibly-valid code
Product: gcc
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Created attachment 46672
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46672&action=edit
Example
For a non-empty vector v, calling v.operator[](v.size()) fires this assertion:
/usr/include/c++/9/bits/stl_vector.h:1042: std::vector<_Tp, _Alloc>::reference
std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) [with
_Tp = int; _Alloc = std::allocator<int>; std::vector<_Tp, _Alloc>::reference =
int&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]: Assertion
'__builtin_expect(__n < this->size(), true)' failed.
After some digging into the standard, I'm not entirely sure whether that
particular invocation of operator[] is UB or otherwise invalid. It's certainly
poor form -- the right way in modern C++ to form a one-past-the-end pointer to
a vector is (v.data() + v.size()), but, if it's indeed legal, then
_GLIBCXX_ASSERTIONS should not be firing.
I suggest one of the following resolutions:
1. Determine that merely calling v.operator[](v.size()) is UB or that it is
otherwise permissible for a conforming implementation to crash when this
happens. This would require some careful standard reading and maybe even a
change to the standard.
2. Weaken the assertion to only crash if the index is strictly greater than the
size. Calling v.operator[](v.size() + 1) is definitely UB (except perhaps in
the pathological case where v.size() + 1 == 0, but I doubt it's possible to
make a vector that large on any supported platform).
3. Use compiler magic to only fire the assertion if the pointer returned by
operator[] is dereferenced for real, e.g. dereferenced and converted to an
lvalue. Maybe gcc could gain a builtin like
__builtin_return_value_is_definitely_dereferenced().
4. Improve the assertion so that, when this assertion fires, a very clear
message is printed to stderr saying something like "This assertion fired due to
the formation of a one-past-the-end reference. This may indicate a stylistic
issue with the program but is not necessarily a bug."
>From gcc-bugs-return-650300-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 15:26:05 2019
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Subject: [Bug c/88451] No rounding in fixed-point arithmetic (Decimal to fixed-point conversion, multiplication)
Date: Mon, 05 Aug 2019 15:26:00 -0000
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--- Comment #5 from Mantas Mikaitis <mantas.mikaitis at manchester dot ac.uk> ---
Hello,
I am raising this again. Has anyone had a change to confirm my testcases fail
in the latest version of the compiler?
Kind regards,
Mantas Mikaitis
>From gcc-bugs-return-650301-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 15:34:25 2019
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Subject: [Bug sanitizer/91311] __attribute__ ((aligned (128))) results in stack-use-after-scope and stack-buffer-overflow
Date: Mon, 05 Aug 2019 15:34:00 -0000
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Konstantin Kharlamov <Hi-Angel at yandex dot ru> changed:
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--- Comment #4 from Konstantin Kharlamov <Hi-Angel at yandex dot ru> ---
(In reply to Martin Liška from comment #3)
> Sorry, but I can't reproduce the issue with any of GCC 7,8,9 and clang8.
Okay, thanks you! I decided to update my system (including the compiler up to
9.1.0) before digging into it any further. So now the problem went away, and
there's no reason to keep this opened. If I manage to reproduce something
similar with 9.1.0, I'll make a separate report then.
That said, does anyone have any guesses about what could've been causing it?
I.e. what to look at if I stumble upon that again?
>From gcc-bugs-return-650302-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 15:48:16 2019
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Subject: [Bug target/91349] [9 regression] powerpc*-*-freebsd* defines _GNU_SOURCE
Date: Mon, 05 Aug 2019 15:48:00 -0000
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I have no idea which parts are GNU-specific, and which parts power actually
needs. I can just see that your change to include gnu-user.h on non-GNU targets
seems like a design smell, and the requirement to kluge around it by #undef'ing
things later confirms it.
The gnu-user.h file has several comments that talk about "GNU userspace" and
none at all that make it obvious it's also used on unrelated targets like
FreeBSD. So it's not obvious that changes to that file now need to consider the
effect on non-GNU targets.
Your comments in rs6000/freebsd.h and rs6000/freebsd64.h just say "Undef
gnu-user.h macros we don't want." Those comments would be more use if they
mentioned why gnu-user.h macros are defined in the first place for FreeBSD and
NetBSD.
And what about all the other non-GNU targets affected by r266496? Is
_GNU_SOURCE now defined for RTEMS? VxWorks?
A smaller (but still smelly) fix would be something like:
--- a/gcc/config/gnu-user.h
+++ b/gcc/config/gnu-user.h
@@ -90,9 +90,11 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If
not, see
#define CC1_SPEC GNU_USER_TARGET_CC1_SPEC
#endif
+#ifdef TARGET_REALLY_GNU
/* The GNU C++ standard library requires that these macros be defined. */
#undef CPLUSPLUS_CPP_SPEC
#define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
+#endif
#define GNU_USER_TARGET_NO_PTHREADS_LIB_SPEC \
"%{shared:-lc} \
@@ -113,8 +115,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively.
If not, see
"%{static|static-pie:--start-group} %G %{!nolibc:%L} \
%{static|static-pie:--end-group}%{!static:%{!static-pie:%G}}"
+#ifdef TARGET_REALLY_GNU
#undef LINK_GCC_C_SEQUENCE_SPEC
#define LINK_GCC_C_SEQUENCE_SPEC GNU_USER_TARGET_LINK_GCC_C_SEQUENCE_SPEC
+#endif
/* Use --as-needed -lgcc_s for eh support. */
#ifdef HAVE_LD_AS_NEEDED
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Subject: [Bug target/91349] [9 regression] powerpc*-*-freebsd* defines _GNU_SOURCE
Date: Mon, 05 Aug 2019 15:48:00 -0000
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--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(assuming something like TARGET_REALLY_GNU existed)
>From gcc-bugs-return-650304-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 15:52:25 2019
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/91312] -Wconversion warning with += operator
Date: Mon, 05 Aug 2019 15:52:00 -0000
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--- Comment #8 from Marc Glisse <glisse at gcc dot gnu.org> ---
We know that the warning is not so useful as is, that's why it isn't part of
Wall or Wextra, see the other bugs on the topic. It needs people with time and
motivation to work on it.
>From gcc-bugs-return-650305-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:02:16 2019
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/80619] bad fix-it hint for GCC %lu directive with int argument: %wu
Date: Mon, 05 Aug 2019 16:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80619
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
No, the bug is still there. This patch fixes it without braking any of the
format.exp tests.
diff --git a/gcc/c-family/c-format.c b/gcc/c-family/c-format.c
index 6363fa4f686..1fa551957d9 100644
--- a/gcc/c-family/c-format.c
+++ b/gcc/c-family/c-format.c
@@ -497,7 +497,7 @@ static const format_length_info printf_length_specs[] =
static const format_length_info asm_fprintf_length_specs[] =
{
{ "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 },
- { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 },
+ { "w", FMT_LEN_w, STD_C89, NO_FMT, 0 },
{ NO_FMT, NO_FMT, 0 }
};
@@ -505,7 +505,7 @@ static const format_length_info asm_fprintf_length_specs[]
=
static const format_length_info gcc_diag_length_specs[] =
{
{ "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 },
- { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 },
+ { "w", FMT_LEN_w, STD_C89, NO_FMT, 0 },
{ NO_FMT, NO_FMT, 0 }
};
diff --git a/gcc/c-family/c-format.h b/gcc/c-family/c-format.h
index 972ba46f109..6aa68dfe883 100644
--- a/gcc/c-family/c-format.h
+++ b/gcc/c-family/c-format.h
@@ -36,6 +36,7 @@ enum format_lengths
FMT_LEN_H,
FMT_LEN_D,
FMT_LEN_DD,
+ FMT_LEN_w, /* GCC's HOST_WIDE_INT. */
FMT_LEN_MAX
};
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From: "antoshkka at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/91358] New: Wrong code with dynamic allocation and optional like class
Date: Mon, 05 Aug 2019 16:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91358
Bug ID: 91358
Summary: Wrong code with dynamic allocation and optional like
class
Product: gcc
Version: 9.1.1
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: antoshkka at gmail dot com
Target Milestone: ---
The issue is reproduced on GCCs from 5 to 9 with -O2 and -std=c++11. GCC-10
also generates wrong code with -O2 -std=c++11 -fno-allocation-dce.
Source code:
template<class T>
struct optional {
optional() : m_initialized(false) {}
~optional() {
if (m_initialized)
reinterpret_cast<T&>(m_storage).~T();
}
bool m_initialized;
alignas(T) unsigned char m_storage[sizeof(T)];
};
struct NoPtr1 {
void *ptr = nullptr;
~NoPtr1() {
if (ptr) {
__builtin_abort();
}
}
};
static void test(optional<NoPtr1> ) noexcept {
delete new unsigned;
}
void process(optional<NoPtr1> state) {
return test(state);
}
int main() {
process({});
}
The above code generates a conditional jump that depends on uninitialised
value. valgrind complains:
==13823== at 0x4007B2: ~NoPtr1 (main.cpp:18)
==13823== by 0x4007B2: ~optional (main.cpp:7)
==13823== by 0x4007B2: process(optional<NoPtr1>) (main.cpp:29)
==13823== by 0x40067F: main (main.cpp:33)
Running the example under GDB confirms that the destructor of NoPtr1 is called:
(gdb) break main.cpp:18
Breakpoint 1 at 0x400686: main.cpp:18. (2 locations)
(gdb) r
Breakpoint 1, NoPtr1::~NoPtr1 (this=<optimized out>, __in_chrg=<optimized out>)
at main.cpp:18
18 if (ptr) {
(gdb) bt
#0 NoPtr1::~NoPtr1 (this=<optimized out>, __in_chrg=<optimized out>) at
main.cpp:18
#1 optional<NoPtr1>::~optional (this=<optimized out>, __in_chrg=<optimized
out>) at main.cpp:7
#2 process (state=...) at main.cpp:29
#3 0x0000000000400680 in main () at main.cpp:33
(gdb) disassemble
Dump of assembler code for function process(optional<NoPtr1>):
0x0000000000400790 <+0>: push %rbp
0x0000000000400791 <+1>: push %rbx
0x0000000000400792 <+2>: sub $0x8,%rsp
0x0000000000400796 <+6>: mov 0x8(%rdi),%rbx
0x000000000040079a <+10>: movzbl (%rdi),%ebp
0x000000000040079d <+13>: mov $0x4,%edi
0x00000000004007a2 <+18>: callq 0x400600 <_Znwm@plt>
0x00000000004007a7 <+23>: mov %rax,%rdi
0x00000000004007aa <+26>: callq 0x4005f0 <_ZdlPv@plt>
=> 0x00000000004007af <+31>: test %rbx,%rbx
0x00000000004007b2 <+34>: je 0x4007b9 <process(optional<NoPtr1>)+41>
0x00000000004007b4 <+36>: test %bpl,%bpl
0x00000000004007b7 <+39>: jne 0x4007c0 <process(optional<NoPtr1>)+48>
0x00000000004007b9 <+41>: add $0x8,%rsp
0x00000000004007bd <+45>: pop %rbx
0x00000000004007be <+46>: pop %rbp
0x00000000004007bf <+47>: retq
0x00000000004007c0 <+48>: callq 0x4005e0 <abort@plt>
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From: "briantcarcich at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/91359] New: GFORTRAN [NNNNN RETURN] of .FALSE. logical function X returns .TRUE. after [if (.not.X) goto NNNNN] - Warning: spaghetti code
Date: Mon, 05 Aug 2019 16:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91359
Bug ID: 91359
Summary: GFORTRAN [NNNNN RETURN] of .FALSE. logical function X
returns .TRUE. after [if (.not.X) goto NNNNN] -
Warning: spaghetti code
Product: gcc
Version: 5.4.0
Status: UNCONFIRMED
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Assignee: unassigned at gcc dot gnu.org
Reporter: briantcarcich at gmail dot com
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Created attachment 46673
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46673&action=edit
Minimal test case; test_zero.f90 from gfortran -save-temps ... test_zero.f
This error does not appear with G77; I also tried it with GFORTRAN 4.4.7 and it
did not appear there.
I attached a minimal test case (.f90, not .i*, as this is FORTRAN). It was
generated from source file test_zero.f, which has the following contents:
logical function zero()
goto 00002
00001 return
00002 zero = .false.
if (.not.zero) goto 00001
return
end
program test_zero
logical zero
if (zero()) stop 'FAIL: zero() returned .TRUE.'
stop 'OKAY: zero() returned .FALSE.'
end
The simplest commands to produce the bug are preceded by [>] below; the
responses are as shown between the commands:
> gfortran -std=legacy -g -O0 -finit-local-zero -fno-automatic -Wall \
test_zero.f -o test_zero_gfortran.e -save-temps -v
Driving: gfortran -std=legacy -g -O0 -finit-local-zero -fno-automatic -Wall
test_zero.f -o test_zero_gfortran.e -save-temps -v -l gfortran -l m
-shared-libgcc
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
5.4.0-6ubuntu1~16.04.11' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs
--enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-5 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib
--disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.11)
COLLECT_GCC_OPTIONS='-std=legacy' '-g' '-O0' '-finit-local-zero'
'-fno-automatic' '-Wall' '-o' 'test_zero_gfortran.e' '-save-temps' '-v'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/5/f951 test_zero.f -ffixed-form -quiet -dumpbase
test_zero.f -mtune=generic -march=x86-64 -auxbase test_zero -g -O0 -Wall
-std=legacy -version -finit-local-zero -fno-automatic -fintrinsic-modules-path
/usr/lib/gcc/x86_64-linux-gnu/5/finclude -o test_zero.s
GNU Fortran (Ubuntu 5.4.0-6ubuntu1~16.04.11) version 5.4.0 20160609
(x86_64-linux-gnu)
compiled by GNU C version 5.4.0 20160609, GMP version 6.1.0, MPFR
version 3.1.4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU Fortran2008 (Ubuntu 5.4.0-6ubuntu1~16.04.11) version 5.4.0 20160609
(x86_64-linux-gnu)
compiled by GNU C version 5.4.0 20160609, GMP version 6.1.0, MPFR
version 3.1.4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
test_zero.f:3:0:
00001 return
^
Warning: control reaches end of non-void function [-Wreturn-type]
COLLECT_GCC_OPTIONS='-std=legacy' '-g' '-O0' '-finit-local-zero'
'-fno-automatic' '-Wall' '-o' 'test_zero_gfortran.e' '-save-temps' '-v'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'
as -v --64 -o test_zero.o test_zero.s
GNU assembler version 2.26.1 (x86_64-linux-gnu) using BFD version (GNU Binutils
for Ubuntu) 2.26.1
Reading specs from /usr/lib/gcc/x86_64-linux-gnu/5/libgfortran.spec
rename spec lib to liborig
COLLECT_GCC_OPTIONS='-std=legacy' '-g' '-O0' '-finit-local-zero'
'-fno-automatic' '-Wall' '-o' 'test_zero_gfortran.e' '-save-temps' '-v'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/5/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/5/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-std=legacy' '-g' '-O0' '-finit-local-zero'
'-fno-automatic' '-Wall' '-o' 'test_zero_gfortran.e' '-save-temps' '-v'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/5/collect2 -plugin
/usr/lib/gcc/x86_64-linux-gnu/5/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
-plugin-opt=-fresolution=test_zero.res -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lquadmath
-plugin-opt=-pass-through=-lm -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc --sysroot=/
--build-id --eh-frame-hdr -m elf_x86_64 --hash-style=gnu --as-needed
-dynamic-linker /lib64/ld-linux-x86-64.so.2 -z relro -o test_zero_gfortran.e
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/5/crtbegin.o -L/usr/lib/gcc/x86_64-linux-gnu/5
-L/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu
-L/usr/lib/gcc/x86_64-linux-gnu/5/../../../../lib -L/lib/x86_64-linux-gnu
-L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib
-L/usr/lib/gcc/x86_64-linux-gnu/5/../../.. test_zero.o -lgfortran -lm -lgcc_s
-lgcc -lquadmath -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/usr/lib/gcc/x86_64-linux-gnu/5/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crtn.o
> ./test_zero_gfortran.e
STOP FAIL: zero() returned .TRUE.
>
The problem is likely related to the warning message above; however in the case
of FORTRAN, the code is correct, as suggested by G77 and version 4.4.7 of
GFORTRAN generating a correct solution.
See https://github.com/drbitboy/sftran3_gfortran_bug for more detail and my
attempt at analysis.
Sidebar: with the presence of the spaghetti GOTOs, "refactor the ugly code"
may be the first response, and I do not disagree with the sentiment. N.B.
however two things: 1) ugly or not, AFAICT this code is not being compiled by
GFORTRAN to the FORTRAN standard; 2) this is a minimal test case that
represents a problem in a much larger codebase converted to FORTRAN by the
SFTRAN3 pre-processor, from a time when IF-ENDIF and DO-ENDDO were not part of
any FORTRAN compiler's grammar.
>From gcc-bugs-return-650308-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:07:32 2019
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Subject: [Bug c++/91360] New: Implement P1143R2: constinit
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First revision available here:
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Subject: [Bug libstdc++/91357] _GLIBCXX_ASSERTIONS rejects possibly-valid code
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's UB, no question. The table of "Optional sequence container operations"
says a[n] is equivalent to *(a.begin() + n) so when n==a.size() you dereference
the past-the-end iterator, which is UB.
>From gcc-bugs-return-650309-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:07:44 2019
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Subject: [Bug c++/91360] Implement P1143R2: constinit
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Mine.
>From gcc-bugs-return-650311-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:12:43 2019
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Subject: [Bug libstdc++/91357] _GLIBCXX_ASSERTIONS rejects possibly-valid code
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
More specifically:
v.operator[](1); /* maybe okay -- forms a pointer one past end */
Not OK. **Dereferences** a past-the end iterator. That's UB. Go to jail. Go
directly to jail. Do not pass Go. Do not collect £200.
v[1]; /* highly suspicious but not obviously invalid or UB */
UB for the same reason.
int *ugly_end = &v[1]; /* hmm. is this okay? */
No. v[1] is UB already, &v[1] doesn't make it unundefined.
std::cout << v[1] << std::endl; /* definitely not okay */
v[2]; /* definitely not okay -- merely computing this pointer is UB */
There's no pointer. vector::operator[] is not specified in terms of pointers.
This is not C.
The assertion is entirely correct. Calling operator[] with an invalid value is
UB, it doesn't matter what you do (or don't do) with the result.
>From gcc-bugs-return-650312-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:17:24 2019
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Subject: [Bug c++/91361] New: Implement P1152R4: Deprecating some uses of volatile
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R3 here:
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1152r3.html
R4 not yet publicly available so won't link it here.
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Subject: [Bug c++/91361] Implement P1152R4: Deprecating some uses of volatile
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I'll take a look. Should be mostly about adding a few warnings.
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Subject: [Bug c/91362] New: program compiled with O3 optimization give different output than without optimization
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Bug ID: 91362
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output than without optimization
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Created attachment 46674
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46674&action=edit
test case, gcc --version output, lscpu output, binaries generated
The attached program give a different output when using O3 optimization level.
The problems seems related to the following piece of code.
if SAFE_AND_SLOW is defined, O3 gives the same results as no optimization
if it is not defined, O3 gives a different result.
for(unsigned int j = 0;j<2;j++){
ctx->c[0] ^= 0xf;
ctx->c[2] ^= gascon_rotr64_interleaved2(ctx->c[2]) ^
gascon_rotr64_interleaved2(ctx->c[2]);
#ifndef SAFE_AND_SLOW
uint32_t*r32 = (uint32_t*)ctx->r;
uint32_t *cpart = ((uint32_t*)ctx->c);
for(unsigned int i=0;i<DRYSPONGE_BLOCKSIZE32;i++){
r32[i]^=cpart[i];
}
#else
uint8_t*c8 = (uint8_t*)ctx->c;
uint8_t*r8 = (uint8_t*)ctx->r;
for(unsigned int i=0;i<DRYSPONGE_BLOCKSIZE;i++){
r8[i]^=c8[i];
}
#endif
}
The attached zip file contain single file test case, build and test script. The
output is the following:
0F00000000000000000000000000000000000000000000000000000000000000 -> ref output
0F00000000000000000000000000000000000000000000000000000000000000 -> ref output
0F00000000000000000000000000000000000000000000000000000000000000 -> O3 with
SAFE_AND_SLOW
0F00000000000000000000000000000000000000000000000000000000000000 -> O3 with
SAFE_AND_SLOW
0000000000000000000000000000000000000000000000000000000000000000 -> O3
0000000000000000000000000000000000000000000000000000000000000000 -> O3
the testcase is a reduced version of the code here:
https://github.com/sebastien-riou/DryGASCON/tree/master/Implementations/crypto_hash/drygascon128/le32
>From gcc-bugs-return-650315-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:24:49 2019
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Subject: [Bug c++/91363] New: Implement P0960R3: Parenthesized initialization of aggregates
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As per <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0960r3.html>.
>From gcc-bugs-return-650316-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:25:31 2019
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>From gcc-bugs-return-650317-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:27:07 2019
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Subject: [Bug libstdc++/91356] Poor optimization of calls involving std::unique_ptr
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The ABI dictates the calling conventions and there's certainly nothing that
libstdc++ can do about it.
In any case, how common is it to have a pointless non-inline baz function which
does nothing but forward to another non-inline function? In practice the
callers of baz will be able to inline it, removing unnecessary null checks on
the moved-from variable, or baz will be able to inline bar, removing the
temporary entirely.
>From gcc-bugs-return-650318-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:35:26 2019
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>From gcc-bugs-return-650319-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:37:06 2019
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Subject: [Bug c++/91365] New: Implement P1814R0: Class template argument deduction for alias templates
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>From gcc-bugs-return-650321-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:38:35 2019
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>From gcc-bugs-return-650323-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:39:33 2019
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Subject: [Bug c++/91366] New: Implement P1816R0: Class template argument deduction for aggregates
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>From gcc-bugs-return-650324-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:39:42 2019
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Subject: [Bug c/91362] program compiled with O3 optimization give different output than without optimization
Date: Mon, 05 Aug 2019 16:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91362
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Looks like an aliasing violation.
>From gcc-bugs-return-650326-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:41:25 2019
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Subject: [Bug c++/91367] Implement P1099R5: using enum
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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>From gcc-bugs-return-650325-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:41:17 2019
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Subject: [Bug c++/91367] New: Implement P1099R5: using enum
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Bug ID: 91367
Summary: Implement P1099R5: using enum
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As per <http://wg21.link/p1099r5>.
>From gcc-bugs-return-650328-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:42:52 2019
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Subject: [Bug c++/91368] Implement P1301R4: [[nodiscard("with reason")]]
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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>From gcc-bugs-return-650327-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:42:43 2019
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Subject: [Bug c++/91368] New: Implement P1301R4: [[nodiscard("with reason")]]
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Bug ID: 91368
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As per <http://wg21.link/p1301r4>.
>From gcc-bugs-return-650330-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:45:57 2019
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Subject: [Bug c++/91369] Implement P0784R7: constexpr new
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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>From gcc-bugs-return-650329-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:45:48 2019
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Subject: [Bug c++/91369] New: Implement P0784R7: constexpr new
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91369
Bug ID: 91369
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As per <http://wg21.link/p0784r7>.
>From gcc-bugs-return-650332-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:48:55 2019
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Subject: [Bug c++/91370] Implement P1041R4 and P1139R2: Stronger Unicode requirements
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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>From gcc-bugs-return-650331-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:48:39 2019
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91370] New: Implement P1041R4 and P1139R2: Stronger Unicode requirements
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91370
Bug ID: 91370
Summary: Implement P1041R4 and P1139R2: Stronger Unicode
requirements
Product: gcc
Version: 10.0
Status: UNCONFIRMED
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Priority: P3
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Assignee: unassigned at gcc dot gnu.org
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As per <http://wg21.link/p1041r4> and <http://wg21.link/p1139r2>.
>From gcc-bugs-return-650333-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:58:32 2019
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Subject: [Bug c/78155] missing warning on invalid isalpha et al.
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--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
I don't really see what existing warning this might fall under, except perhaps
-Wchar-subscripts because isalpha and friend use the argument as an index into
an array of 257 characters, but that seems like a stretch.
I think maybe adding a more general warning option, say something like
-Wargument-range, and using it to diagnose all such problems, might be the way
to go. To generalize the solution I would even consider adding a new function
attribute, let's call it range, to specify the range of valid values of a
function argument. Then isalpha (or any other such function) could be declared
like so:
__attribute__ ((range (/* position = */1, -1, UCHAR_MAX)))
int isalpha (int);
GCC would then check every call to the function to see if its argument is in
the expected range and, if not, issue a warning. The attribute could even be
applied multiple times to specify disjoint ranges. Position zero could denote
the return value so that toupper could be declared like so
__attribute__ ((range (/* returns = */ 0, -1, UCHAR_MAX),
range (/* position = */ 1, -1, UCHAR_MAX)))
int toupper (int);
>From gcc-bugs-return-650334-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 16:59:12 2019
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Subject: [Bug c++/91368] Implement P1301R4: [[nodiscard("with reason")]]
Date: Mon, 05 Aug 2019 16:59:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |patch
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Patch available:
https://gcc.gnu.org/ml/gcc-patches/2019-07/msg01670.html
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Subject: [Bug c++/88337] Implement P1002R1, P1327R1, P1330R0, C++20 relaxations of constexpr restrictions.
Date: Mon, 05 Aug 2019 17:14:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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>From gcc-bugs-return-650336-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 17:17:36 2019
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From: "roland at rschulz dot eu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/91371] New: std::bind and bind_front don't work with function with call convention
Date: Mon, 05 Aug 2019 17:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91371
Bug ID: 91371
Summary: std::bind and bind_front don't work with function with
call convention
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: roland at rschulz dot eu
Target Milestone: ---
If a function with call convention function type attribute is passed to
bind/bind_front it fails.
Reproducer:
#include<functional>
int bar(int) __attribute__((ms_abi)); //same with fastcall, thiscall
void test() {
std::bind(bar, 5)(); //error: function returning a function
std::bind_front(bar, 5)(); //error: static assertion failed
}
Godbolt showing it works with libc++:
https://godbolt.org/z/3g7Vk7
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Subject: [Bug target/83250] _mm256_zextsi128_si256 missing for AVX2 zero extension
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |a-yee at u dot northwestern.edu
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
*** Bug 91340 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-650337-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 17:21:51 2019
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Subject: [Bug target/91340] Missing AVX and AVX512 Intrinsics: Zero-Extension
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H.J. Lu <hjl.tools at gmail dot com> changed:
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--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Dup.
*** This bug has been marked as a duplicate of bug 83250 ***
>From gcc-bugs-return-650339-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 17:21:52 2019
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Subject: [Bug target/88918] [meta-bug] x86 intrinsic issues
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Bug 88918 depends on bug 91340, which changed state.
Bug 91340 Summary: Missing AVX and AVX512 Intrinsics: Zero-Extension
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91340
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>From gcc-bugs-return-650341-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 17:28:48 2019
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Subject: [Bug target/58684] powerpc uses only unordered floating-point compares
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--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> ---
*** Bug 91331 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-650340-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 17:28:48 2019
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Subject: [Bug target/91331] new test case gcc.dg/torture/pr91323.c from r274005 fails
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This is another instance of PR58684.
*** This bug has been marked as a duplicate of bug 58684 ***
>From gcc-bugs-return-650342-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 17:33:02 2019
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Subject: [Bug c/91362] program compiled with O3 optimization give different output than without optimization
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is an alias violation for sure.
You write ctx->c as uint64_t and then read it as uint32_t in a few places.
Even inside gascon_rotr64_interleaved2 too.
Either use an union of (array of uint32_t) and an uint64_t or use memcpy to
read as uint32_t.
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Subject: [Bug target/83250] _mm256_zextsi128_si256 missing for AVX2 zero extension
Date: Mon, 05 Aug 2019 17:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83250
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-05
Ever confirmed|0 |1
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
This compiles:
---
#include <immintrin.h>
__m256i
_mm256_zextsi128_si256 (__m128i x)
{
return __extension__ (__m256i) { x[0], x[1], 0, 0 };
}
__m512i
_mm512_zextsi256_si512 (__m256i x)
{
return __extension__ (__m512i) { x[0], x[1], x[2], x[3],
0, 0, 0, 0 };
}
__m512i
_mm512_zextsi128_si512 (__m128i x)
{
return _mm512_zextsi256_si512 (_mm256_zextsi128_si256 (x));
}
---
But combiner doesn't convert nested vec_concat into a single vec_concat:
Trying 12 -> 14:
12: r94:V4DI=vec_concat(r96:V2DI,const_vector)
REG_DEAD r96:V2DI
14: r87:V8DI=vec_concat(r94:V4DI,const_vector)
REG_DEAD r94:V4DI
Failed to match this instruction:
(set (reg:V8DI 87)
(vec_concat:V8DI (vec_concat:V4DI (reg:V2DI 96)
(const_vector:V2DI [
(const_int 0 [0]) repeated x2
]))
(const_vector:V4DI [
(const_int 0 [0]) repeated x4
])))
Also we don't have patterns for AVX/AVX512 instructions with zero
extension, like
(set (reg:V4DI 91)
(vec_concat:V4DI (subreg:V2DI (plus:V16QI (subreg:V16QI (reg:V2DI 97) 0)
(subreg:V16QI (reg:V2DI 96) 0)) 0)
(const_vector:V2DI [
(const_int 0 [0]) repeated x2
])))
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00286.html
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Subject: [Bug target/91341] Missing AVX Intrinsics: load/store u2
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Implemented for 10.1.
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Subject: [Bug target/88918] [meta-bug] x86 intrinsic issues
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Bug 88918 depends on bug 91341, which changed state.
Bug 91341 Summary: Missing AVX Intrinsics: load/store u2
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91341
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-05
CC| |kargl at gcc dot gnu.org
Summary|GFORTRAN [NNNNN RETURN] of |logical function X returns
|.FALSE. logical function X |.TRUE. - Warning:
|returns .TRUE. after [if |spaghetti code
|(.not.X) goto NNNNN] - |
|Warning: spaghetti code |
Ever confirmed|0 |1
--- Comment #1 from kargl at gcc dot gnu.org ---
The options -finit-local-zero and -fno-automatic are unimportant.
Compiling the code in comment #1 with -fdump-tree-original reveals
the problem as the function is translated into
zero ()
{
logical(kind=4) __result_zero;
goto __label_000002;
__label_000001:;
return;
__label_000002:;
__result_zero = 0;
if (!__result_zero) goto __label_000001;
L.1:;
return __result_zero;
return __result_zero;
}
Notice the first 'return' statement has no value to return.
A work around to to introduce a RESULT variable. This is
translated to
function zero() result(a)
logical a
goto 2
1 return
2 a = .false.
if (.not. a) goto 1
return
end
zero ()
{
logical(kind=4) a;
goto __label_000002;
__label_000001:;
return a;
__label_000002:;
a = 0;
if (!a) goto __label_000001;
L.1:;
return a;
return a;
}
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Subject: [Bug fortran/91372] New: [10 Regression] Error: Unclassifiable statement
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Bug ID: 91372
Summary: [10 Regression] Error: Unclassifiable statement
Product: gcc
Version: 10.0
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r274054 gave:
[hjl@gnu-skl-2 build_base_gcc-m64.0000]$ cat foo.f90
MODULE module_sf_lake
implicit none
integer, parameter :: r8 = selected_real_kind(12)
integer, private :: i ! loop index
real(r8) :: sand(19) ! percent sand
data(sand(i), i=1,19)/92.,80.,66.,20.,5.,43.,60.,&
10.,32.,51., 6.,22.,39.7,0.,100.,54.,17.,100.,92./
END MODULE module_sf_lake
[hjl@gnu-skl-2 build_base_gcc-m64.0000]$
/export/gnu/import/git/gcc-test-spec/usr/bin/gfortran -m64 -c -o
module_sf_lake.fppized.o -I. -I./netcdf/include -I./inc
-fno-unsafe-math-optimizations -mfpmath=sse -march=native -O2
-fconvert=big-endian foo.f90
foo.f90:9:4:
9 | data(sand(i), i=1,19)/92.,80.,66.,20.,5.,43.,60.,&
| 1
Error: Unclassifiable statement at (1)
[hjl@gnu-skl-2 build_base_gcc-m64.0000]$
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Subject: [Bug fortran/91372] [10 Regression] Error: Unclassifiable statement
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kargl at gcc dot gnu.org
--- Comment #1 from kargl at gcc dot gnu.org ---
(In reply to H.J. Lu from comment #0)
> r274054 gave:
>
> [hjl@gnu-skl-2 build_base_gcc-m64.0000]$ cat foo.f90 >
>
> 9 | data(sand(i), i=1,19)/92.,80.,66.,20.,5.,43.,60.,&
The code is invalid.
Free-form source code requires whitespace after "DATA".
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |87403
--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
ok, making this block the "new-warning" meta-bug then
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87403
[Bug 87403] [Meta-bug] Issues that suggest a new warning
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Subject: [Bug c++/91361] Implement P1152R4: Deprecating some uses of volatile
Date: Mon, 05 Aug 2019 18:49:00 -0000
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Actually, no reason not to link R4: <http://wg21.link/p1152r4>.
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Subject: [Bug fortran/90985] Wrong error message with variables named "DATA*"
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |91372
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
This may have caused PR 91372.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91372
[Bug 91372] Error: Unclassifiable statement
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Subject: [Bug c++/91338] Implement P1161R3: Deprecate a[b,c]
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Aug 5 19:01:15 2019
New Revision: 274121
URL: https://gcc.gnu.org/viewcvs?rev=274121&root=gcc&view=rev
Log:
PR c++/91338 - Implement P1161R3: Deprecate a[b,c].
* c-opts.c (c_common_post_options): Enable -Wcomma-subscript by
default for C++2a, unless -Wno-deprecated.
* c.opt (Wcomma-subscript): New warning.
* parser.c (cp_parser_postfix_open_square_expression): Warn about uses
of a comma operator within a subscripting expression.
(cp_parser_skip_to_closing_square_bracket_1): New function, made out
of...
(cp_parser_skip_to_closing_square_bracket): ...this.
* doc/invoke.texi: Document -Wcomma-subscript.
* g++.dg/cpp2a/comma1.C: New test.
* g++.dg/cpp2a/comma2.C: New test.
* g++.dg/cpp2a/comma3.C: New test.
* g++.dg/cpp2a/comma4.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp2a/comma1.C
trunk/gcc/testsuite/g++.dg/cpp2a/comma2.C
trunk/gcc/testsuite/g++.dg/cpp2a/comma3.C
trunk/gcc/testsuite/g++.dg/cpp2a/comma4.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c-opts.c
trunk/gcc/c-family/c.opt
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
trunk/gcc/doc/invoke.texi
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Implemented for 10.1.
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Subject: [Bug fortran/91372] Error: Unclassifiable statement
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--- Comment #2 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Mon, Aug 05, 2019 at 06:44:31PM +0000, kargl at gcc dot gnu.org wrote:
>
> The code is invalid.
>
> Free-form source code requires whitespace after "DATA".
>
So my reading to
R837 data-stmt is DATA data-stmt-set [ [ , ] data-stmt-set ] ...
may have been to strict. The standard has
A blank shall be used to separate names, constants, or labels
from adjacent keywords, names, constants, or labels.
The '(' isn't a name, constant, or label, so the blank may
be omitted. Easy to fix.
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Subject: [Bug fortran/91372] Error: Unclassifiable statement
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Assignee|unassigned at gcc dot gnu.org |kargl at gcc dot gnu.org
Severity|normal |trivial
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--- Comment #3 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Mon Aug 5 19:24:31 2019
New Revision: 274122
URL: https://gcc.gnu.org/viewcvs?rev=274122&root=gcc&view=rev
Log:
2019-08-05 Steven g. Kargl <kargl@gcc.gnu.org>
PR fortran/91372
* decl.c (gfc_match_data): Allow an implied do-loop to nestle against
DATA.
2019-08-05 Steven g. Kargl <kargl@gcc.gnu.org>
PR fortran/91372
* gfortran.dg/pr91372.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/pr91372.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/decl.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/88095] class nontype template parameter UDL string literals doesn't accepts deduction placeholder
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--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Mon Aug 5 19:34:23 2019
New Revision: 274123
URL: https://gcc.gnu.org/viewcvs?rev=274123&root=gcc&view=rev
Log:
PR c++/88095, CTAD for literal operator templates per P0732
This patch fixes PR c++/88095: class nontype template parameter UDL string
literals doesn't accepts deduction placeholder
It also addresses a latent issue; literal operator templates with template
parameter packs of literal class type were previously accepted. The patch
corrects this and adds a test (udlit-class-nttp-neg.C).
This fix is needed for one of the char8_t remediation approaches documented
in P1423, and may be helpful for existing code bases impacted by the char8_t
changes adopted via P0482 for C++20.
gcc/cp/ChangeLog:
2019-08-02 Tom Honermann <tom@honermann.net>
* parser.c (cp_parser_template_declaration_after_parameters): Enable
class template argument deduction for non-type template parameters
in literal operator templates.
gcc/testsuite/ChangeLog:
2019-08-02 Tom Honermann <tom@honermann.net>
PR c++/88095
* g++.dg/cpp2a/udlit-class-nttp-ctad.C: New test.
* g++.dg/cpp2a/udlit-class-nttp-ctad-neg.C: New test.
* g++.dg/cpp2a/udlit-class-nttp-ctad-neg2.C: New test.
* g++.dg/cpp2a/udlit-class-nttp.C: New test.
* g++.dg/cpp2a/udlit-class-nttp-neg.C: New test.
* g++.dg/cpp2a/udlit-class-nttp-neg2.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp2a/udlit-class-nttp-ctad-neg.C
trunk/gcc/testsuite/g++.dg/cpp2a/udlit-class-nttp-ctad-neg2.C
trunk/gcc/testsuite/g++.dg/cpp2a/udlit-class-nttp-ctad.C
trunk/gcc/testsuite/g++.dg/cpp2a/udlit-class-nttp-neg.C
trunk/gcc/testsuite/g++.dg/cpp2a/udlit-class-nttp-neg2.C
trunk/gcc/testsuite/g++.dg/cpp2a/udlit-class-nttp.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-650359-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 19:53:53 2019
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Subject: [Bug middle-end/90796] [8/9/10 Regression] GCC: O2 vs O3 output differs on simple test
Date: Mon, 05 Aug 2019 19:53:00 -0000
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--- Comment #7 from Michael Matz <matz at gcc dot gnu.org> ---
Created attachment 46675
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46675&action=edit
potential patch
Actually I was barking up the wrong tree. It's not as easy as the CFG
manipulation for loop fusion going wrong (like missing some last iterations
or so). It's really a problem in the dependence analysis. See the extensive
comment in the patch.
The fun thing is, there's a difference between these two loop nests:
for (i) for (j) a[i][0] = f(a[i+1][0]);
for (i) for (j) b[i][j] = f(a[i+1][j]);
Even though the distance vector for the read/write in the single statement
is (-1,0) for both loops, unroll-and-jam is valid for the second but not
for the first.
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Subject: [Bug fortran/91372] Error: Unclassifiable statement
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kargl at gcc dot gnu.org changed:
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--- Comment #4 from kargl at gcc dot gnu.org ---
Fixed. Sorry about the confusion.
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Subject: [Bug tree-optimization/91240] [8/9/10 Regression] Wrong code with -O3 due to unroll and jam pass
Date: Mon, 05 Aug 2019 20:00:00 -0000
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--- Comment #3 from Michael Matz <matz at gcc dot gnu.org> ---
Also fixed by the patch at PR90796.
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Subject: [Bug c++/91368] Implement P1301R4: [[nodiscard("with reason")]]
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JeanHeyd Meneide <phdofthehouse at gmail dot com> changed:
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--- Comment #2 from JeanHeyd Meneide <phdofthehouse at gmail dot com> ---
I'm the one who made the patch. I'd be happy to help field any questions or fix
anything!
>From gcc-bugs-return-650363-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 05 20:43:31 2019
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Subject: [Bug middle-end/91358] Wrong code with dynamic allocation and optional like class
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Michael Matz <matz at gcc dot gnu.org> changed:
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--- Comment #1 from Michael Matz <matz at gcc dot gnu.org> ---
No wrong code involved here. The uninitialized register that valgrind
complains
about is only uninitialized in exactly the case when %ebp (aka .m_initialized)
is zero. So the insn sequence
=> 0x00000000004007af <+31>: test %rbx,%rbx
0x00000000004007b2 <+34>: je 0x4007b9 <process(optional<NoPtr1>)+41>
0x00000000004007b4 <+36>: test %bpl,%bpl
0x00000000004007b7 <+39>: jne 0x4007c0 <process(optional<NoPtr1>)+48>
0x00000000004007b9 <+41>: add $0x8,%rsp
goes to 0x4007b9 no matter what. (if %rbx==uninit happens to be zero, then
directly, otherwise via the not-taken jump at 0x4007b7, because %ebp is zero).
The read from the uninitialized memory itself (from .ptr) is harmless as well,
because the memory backing that access must be there, as the structure is
large enough.
So, if you've seen a real problem somewhere (and not just valgrind complaining
about uninitialized registers in comparisons), then you've reduced the testcase
too much. (The abort() in the testcase leads me to think that this was once
a larger testcase where the abort was triggered unexpectedly. I'll note that
it isn't triggered with this testcase.)
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Subject: [Bug tree-optimization/91109] [10 regression][arm] gcc.c-torture/execute/20040709-1.c fails since r273135
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--- Comment #8 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Patch is posted here: https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00305.html
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Subject: [Bug c/89180] [meta-bug] bogus/missing -Wunused warnings
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Bug 89180 depends on bug 91335, which changed state.
Bug 91335 Summary: False positive "unused variable" warning with variable initialized in 'if' condition
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91335
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Subject: [Bug c++/91335] False positive "unused variable" warning with variable initialized in 'if' condition
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Declaring the variable with attribute unused (or [[maybe_unused]]) is the
intended mechanism to suppress the warning when the variable is meant to be
declared but not otherwise referenced:
int main() {
if (int *f __attribute__ ((unused)) = foo())
return 1;
}
I agree that the warning for the test case is not just by design but desirable,
and since there are several straightforward solutions I think this report
should be resolved invalid.
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Subject: [Bug c/50476] Warn of pointer set to object whose lifetime is limited
Date: Mon, 05 Aug 2019 23:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50476
Bug 50476 depends on bug 60517, which changed state.
Bug 60517 Summary: warning/error for taking address of member of a temporary object
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60517
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug c/45821] no warning when returning a local variable address within a statement expression
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45821
Bug 45821 depends on bug 60517, which changed state.
Bug 60517 Summary: warning/error for taking address of member of a temporary object
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60517
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug c++/60517] warning/error for taking address of member of a temporary object
Date: Mon, 05 Aug 2019 23:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60517
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |msebor at gcc dot gnu.org
Known to work| |9.1.0
Resolution|--- |FIXED
Known to fail| |4.9.1, 5.5.0, 6.4.0, 7.4.0,
| |8.3.0
--- Comment #25 from Martin Sebor <msebor at gcc dot gnu.org> ---
GCC 9 rejects the test case with the error below:
$ cat pr60517.C && gcc -Wall -S pr60517.C
class B {
public:
double x[2];
};
class A {
B b;
public:
B getB(void) { return b; }
};
double foo(A a) {
double * x = &(a.getB().x[0]);
return x[0];
}
pr60517.C: In function ‘double foo(A)’:
pr60517.C:12:33: error: taking address of rvalue [-fpermissive]
12 | double * x = &(a.getB().x[0]);
| ^
The change that introduced the error is r260621:
CWG 616, 1213 - value category of subobject references.
* tree.c (lvalue_kind): A reference to a subobject of a prvalue is
an xvalue.
* typeck2.c (build_m_component_ref): Likewise.
* typeck.c (cp_build_addr_expr_1, lvalue_or_else): Remove diagnostic
distinction between temporary and xvalue.
I don't see a test case for this error so let me add one and resolve the bug.
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Subject: [Bug c++/51270] missed warning about returning reference to temporary
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Bug 51270 depends on bug 60517, which changed state.
Bug 60517 Summary: warning/error for taking address of member of a temporary object
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60517
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug c++/60517] warning/error for taking address of member of a temporary object
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60517
--- Comment #26 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Tue Aug 6 00:08:45 2019
New Revision: 274130
URL: https://gcc.gnu.org/viewcvs?rev=274130&root=gcc&view=rev
Log:
PR c++/60517 - warning/error for taking address of member of a temporary object
testsuite/ChangeLog:
* g++.dg/pr60517.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/pr60517.C
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug middle-end/50476] Warn of pointer set to object whose lifetime is limited
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |msebor at gcc dot gnu.org
Component|c |middle-end
Known to work| |10.0, 7.3.0, 8.3.0, 9.1.0
Resolution|--- |FIXED
Known to fail| |4.5.2, 4.8.5, 4.9.4, 5.4.0,
| |6.4.0
--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
GCC 7 and later diagnose the test case:
pr50476.c: In function ‘main’:
pr50476.c:17:9: warning: ‘y’ is used uninitialized in this function
[-Wuninitialized]
17 | printf("int: %d\n", *x);
| ^~~~~~~~~~~~~~~~~~~~~~~
The warning is less from ideal because it doesn't point to the y it refers to
but that's a separate issue.
The change that added the warning is r245840 so this can be resolved as fixed.
2017-03-02 Richard Biener <rguenther@suse.de>
PR tree-optimization/79345
PR c++/42000
* tree-ssa-alias.c (walk_aliased_vdefs_1): Take a limit
param and abort the walk, returning -1 if it is hit.
(walk_aliased_vdefs): Take a limit param and pass it on.
* tree-ssa-alias.h (walk_aliased_vdefs): Add a limit param,
defaulting to 0 and return a signed int.
* tree-ssa-uninit.c (struct check_defs_data): New struct.
(check_defs): New helper.
(warn_uninitialized_vars): Use walk_aliased_vdefs to warn
about uninitialized memory.
* fixed-value.c (fixed_from_string): Use ulow/uhigh to avoid
bogus uninitialized warning.
(fixed_convert_from_real): Likewise.
* g++.dg/warn/Wuninitialized-7.C: New testcase.
* c-c++-common/ubsan/bounds-2.c: Add -Wno-uninitialized.
* gcc.dg/uninit-pr19430-2.c: Add expected warning.
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Subject: [Bug middle-end/50476] Warn of pointer set to object whose lifetime is limited
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--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Tue Aug 6 00:30:02 2019
New Revision: 274135
URL: https://gcc.gnu.org/viewcvs?rev=274135&root=gcc&view=rev
Log:
PR middle-end/50476 - Warn of pointer set to object whose lifetime is limited
gcc/testsuite/ChangeLog:
* gcc.dg/uninit-pr50476.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/uninit-pr50476.c
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/91304] maybe_unused attribute ignored on variable declared in if declaration
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |10.0, 9.1.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. These forms work:
int f();
void g()
{
if (int i [[maybe_unused]] = f()) { }
}
void h()
{
if (auto i [[maybe_unused]] = f()) { }
}
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Subject: [Bug target/91349] [9 regression] powerpc*-*-freebsd* defines _GNU_SOURCE
Date: Tue, 06 Aug 2019 01:52:00 -0000
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--- Comment #9 from Alan Modra <amodra at gmail dot com> ---
> I have no idea which parts are GNU-specific, and which parts power actually needs.
Yeah, I was being cheeky in suggesting you provide the effort needed.
> I can just see that your change to include gnu-user.h on non-GNU targets seems like a design smell, and the requirement to kluge around it by #undef'ing things later confirms it.
If #undefs are a measure of "design smell" then rs6000/freebsd64.h already had
forty before I added two more. Many of those are there due to including other
headers that define OS specific macros unsuitable for freebsd.
The mess is mostly due to rs6000/sysv4.h -mcall-<other-os> support. Without
that I may not have needed to include gnu-user.h before rs6000/sysv4.h
everywhere. The -mcall stuff needs to disappear before any meaningful
untangling of OS-specific macros in the rs6000 header files can be done.
>From gcc-bugs-return-650376-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 02:00:34 2019
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From: "phd at phd dot re" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91318] [C++][PATCH] warnings about unused internal macros with -Wunused-macros and #pragma GCC optimize
Date: Tue, 06 Aug 2019 02:00:00 -0000
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--- Comment #3 from Piotr Henryk Dabrowski <phd at phd dot re> ---
Sent:
https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00325.html
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From: "qiang.fu at verisilicon dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/91373] New: gcc6.2.0: ((U32)((U16 * U16)) >> 31) cannot always get correct result with gcc -O2
Date: Tue, 06 Aug 2019 02:21:00 -0000
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Bug ID: 91373
Summary: gcc6.2.0: ((U32)((U16 * U16)) >> 31) cannot always get
correct result with gcc -O2
Product: gcc
Version: 6.2.0
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Created attachment 46676
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46676&action=edit
main.c
Hi,
I met an issue with gcc6.2.0: ((U16 * U16) >> 31) cannot always get expected
result for gcc optimization switch '-O2'.
e.g.
(63139 * 36032) >> 30 = 0x2 // right
(63139 * 36032) >> 31 = 0x0 // wrong, should be 0x1.
I create a test case for it, see the attachement(main.c). It passed on gcc
4.6.3, but failed with gcc6.2.0 + release build(gcc -O2)
gcc -O2 main.c -o test
./test 63139 36032
data1: 0x879a1e40, data1 >> 31: 1, data1 >> 30: 2
data2: 0x879a1e40, data2 >> 31: 0, data1 >> 30: 2
This test passed if build with -O0 or -O1 with gcc6.2.0
GCC version: 6.2.0
*
gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/6.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure -enable-checking=release -enable-languages=c,c++
-disable-multilib
Thread model: posix
gcc version 6.2.0 (GCC)
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From: "briantcarcich at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
Date: Tue, 06 Aug 2019 02:37:00 -0000
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--- Comment #2 from Brian T. Carcich <briantcarcich at gmail dot com> ---
Agreed that the options -finit-local-zero and -fno-automatic are extraneous;
sorry, they were dragged into here from my Makefile because I need them for the
larger project.
Also, I know how to do a workaround, several in fact, to trick GFORTRAN into
doing the correct thing, as demonstrated by the Github example; that is not the
issue.
The issue is that this *is* a bug in GFORTRAN: the return on Line 3 (label
00002) should cause GFORTRAN to generate a correct [return __result_zero;], and
not the incorrect naked [return;] that it does now.
Other FORTRAN compilers do that, also earlier version of GFORTRAN, because it
is correct.
If I get some free time I will work on a patch, but I suspect someone familiar
with the code could fix this before I suss out where the fix should be done.
Thanks,
Brian Carcich
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Subject: [Bug middle-end/90597] [9/10 Regression] FAIL: gcc.dg/attr-vector_size.c (internal compiler error)
Date: Tue, 06 Aug 2019 02:46:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
pr89797 reported a similar (but not quite the same) ICE in the aarch64
back-end. Maybe the hppa64 back-end needs a similar tweak to keep the
assertion from failing.
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
Date: Tue, 06 Aug 2019 04:04:00 -0000
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--- Comment #3 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Tue, Aug 06, 2019 at 02:37:25AM +0000, briantcarcich at gmail dot com wrote:
>
> The issue is that this *is* a bug in GFORTRAN.
>
I never claimed that it wasn't a bug.
PS: The name of the compiler is gfortran. The name of the programming
language is Fortran. It's been Fortran for more than 29 years. Give
your caps lock key a rest.
PPS: Thanks for giving me a reason to stop looking at how to fix
the problem.
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Subject: [Bug fortran/87797] Enhancement: Warning for potential name clash of variables/intrinsics...
Date: Tue, 06 Aug 2019 04:09:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
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Subject: [Bug c++/41423] missing warning for an uncallable function template
Date: Tue, 06 Aug 2019 04:11:00 -0000
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--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
Would this go under a new flag or an existing one?
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Subject: [Bug fortran/89943] Submodule functions are not allowed to have C binding
Date: Tue, 06 Aug 2019 05:08:00 -0000
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |83113
--- Comment #3 from kargl at gcc dot gnu.org ---
This bug is similar to PR 83113.
It seems that attributes in general are flagged in
submodules as duplicates when an interface is given
in the module and the interface is copied to the
submodule. Add 83113 as "Depends On", but it's more
the same error.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83113
[Bug 83113] Bogus "duplicate allocatable attribute" error for submodule
character function
>From gcc-bugs-return-650384-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 05:28:24 2019
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
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--- Comment #4 from Brian T. Carcich <briantcarcich at gmail dot com> ---
PPPS I apologize; by way of ignorant excuse, my history with Fortran goes back
way more than 29y.
>From gcc-bugs-return-650385-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 05:30:44 2019
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
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--- Comment #5 from Brian T. Carcich <briantcarcich at gmail dot com> ---
PPPPS ... as does yours, probably
--- Comment #6 from Brian T. Carcich <briantcarcich at gmail dot com> ---
PPPPS ... as does yours, possibly.
>From gcc-bugs-return-650386-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 05:30:47 2019
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
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--- Comment #5 from Brian T. Carcich <briantcarcich at gmail dot com> ---
PPPPS ... as does yours, probably
--- Comment #6 from Brian T. Carcich <briantcarcich at gmail dot com> ---
PPPPS ... as does yours, possibly.
>From gcc-bugs-return-650387-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 05:31:27 2019
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
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--- Comment #7 from Brian T. Carcich <briantcarcich at gmail dot com> ---
Oh dear.
>From gcc-bugs-return-650388-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 05:33:06 2019
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
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--- Comment #8 from Brian T. Carcich <briantcarcich at gmail dot com> ---
Not exactly a page out of Dale Carnegie.
>From gcc-bugs-return-650389-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 05:42:44 2019
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Subject: [Bug c/91373] gcc6.2.0: ((U32)((U16 * U16)) >> 31) cannot always get correct result with gcc -O2
Date: Tue, 06 Aug 2019 05:42:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
U16_0 * U16_1
Is really:
((int)(U16_0)) * ((int)(U16_1))
Due to C/C++ promption rules.
Which means in this case, it overflows and since both were positive (due to u16
promoting to int) to begin with, shifting to get to the sign bit will always be
0.
If you want to unsigned 32 as the type, then you need to explictly cast it.
>From gcc-bugs-return-650390-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 05:52:46 2019
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Subject: [Bug fortran/66575] Endless compilation on missing end interface
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kargl at gcc dot gnu.org changed:
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--- Comment #8 from kargl at gcc dot gnu.org ---
All of the testcases in this PR seem to generate an error now with trunk.
Can we add the one test mention by Jerry and close this PR?
>From gcc-bugs-return-650391-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 06:33:26 2019
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Subject: [Bug tree-optimization/91374] New: [Missed optimization] Versioning opportunities to improve performance
Date: Tue, 06 Aug 2019 06:33:00 -0000
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Bug ID: 91374
Summary: [Missed optimization] Versioning opportunities to
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Consider the following code
=== begin code ===
#define LENGTH 512
#define STRIDE 32
char src[LENGTH];
char dst[LENGTH];
static const int height[2] = { 32, 16 };
static const int width[2] = { 16, 8 };
volatile int result;
void foo(int height, int width) {
char * ptr_src = src;
char * ptr_dst = dst;
for( int y = 0; y < height; y++ )
{
for( int x = 0; x < width; x++ )
ptr_dst[x] = ptr_src[x] + ptr_src[x];
ptr_dst += STRIDE;
ptr_src += STRIDE;
}
}
int main(int argc, char *argv[]) {
for (int i = 0; i < LENGTH; i++) {
src[i] = i % 256;
}
int idx = argc % 2;
int h = height[idx];
int w = width[idx];
foo(h, w);
result = dst[argc];
}
=== end code ===
The inner loop boundary "width" can be 16 or 8. Compiled with "-O3", gcc
generates nested loops for foo.
But if we can make use of 16 and 8 to versioning the code (e.g. 3 versions for
8, 16, general), the inner loop can be removed and fully vectorized (for both
AArch64 and X86_64 architecture), the performance will be much better as there
is single loop.
The case is simplified from real benchmark and foo is very hot.
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--- Comment #2 from Qiang <qiang.fu at verisilicon dot com> ---
Hi Andrew,
Thank your for your quickly reply.
I still have some questions about this issue.
It's very natural to write down the following code.
All arguments are declared with 'U16', and the return type is 'U32'.
U32 foo(U16 d1, U16 d2)
{
U32 data2 = d1 * d2;
printf("data2: 0x%08x, data2 >> 31: %d, data2 >> 30: %d\n", data2, data2 >>
31, data2 >> 30);
return data2;
}
It works under the old gcc like (gcc4.6.3 + '-O2') or VS2015. Also works under
gcc5.4.0/gcc6.2.0 + '-O0'/'-O1'.
But it failed under gcc5.4.0/gcc6.2.0 + '-O2'.
If GCC need to follow rule, it should not be relative to GCC optimization.
Why does it get different result with different optimization level?
Even if there is U16 overflow issue, it's natural that user want GCC tool to
take them as 'U32' argument because the return type is 'U32'.
The following code works, but it's a burden that tool need user to explicitly
cast it too follow the implicit rule, isn't it?
U32 data2 = (U32)d1 * (U32)d2;
>From gcc-bugs-return-650393-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 07:21:19 2019
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Subject: [Bug libstdc++/91356] Poor optimization of calls involving std::unique_ptr
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--- Comment #2 from Niels Möller <nisse at lysator dot liu.se> ---
(In reply to Jonathan Wakely from comment #1)
> The ABI dictates the calling conventions and there's certainly nothing that
> libstdc++ can do about it.
My impression was that C++ ABI is under the control of compiler and C++
standard library, and that there is no such thing as a standard C++ ABI. As
evidenced by the (rare) ABI breaks in libstdc++, and the difficulty of linking
C++ objects compiled with different C++ compilers (e.g, g++ and clang++).
If ABI standard + language spec nails down, e.g., rules on when to pass a C++
object by invisible reference, but doesn't nail down the ABI of std::string,
then the C++ specifics of the ABI standard is a bit pointless, imo. But I
understand my opinion doesn't carry much weight on that... So if it's really
not feasible to improve the situation at all for gnu/linux x86_64 elf targets,
*please* try to keep std::unique_ptr in mind when involved in ABI design for
other targets.
For specific types defined by the GNU standard C++ library, it may also be
possible to add any needed G++ specific attributes in library headers to tell
the compiler to depart from the "standard" ABI.
> In any case, how common is it to have a pointless non-inline baz function
> which does nothing but forward to another non-inline function?
In my experience (mainly from working on the webrtc.org code, where
implementation inheritance is discouraged), it's common with implementations of
interface classes consisting of almost trivial implementations of the
interface's virtual functions, which only setup the correct arguments for
calling a non-inlined (and possibly virtual) method on some member to do the
real work.
>From gcc-bugs-return-650394-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 07:26:58 2019
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Subject: [Bug middle-end/90796] [8/9/10 Regression] GCC: O2 vs O3 output differs on simple test
Date: Tue, 06 Aug 2019 07:26:00 -0000
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--- Comment #8 from rguenther at suse dot de <rguenther at suse dot de> ---
On August 5, 2019 9:53:48 PM GMT+02:00, "matz at gcc dot gnu.org"
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90796
>
>--- Comment #7 from Michael Matz <matz at gcc dot gnu.org> ---
>Created attachment 46675
> --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46675&action=edit
>potential patch
>
>Actually I was barking up the wrong tree. It's not as easy as the CFG
>manipulation for loop fusion going wrong (like missing some last
>iterations
>or so). It's really a problem in the dependence analysis. See the
>extensive
>comment in the patch.
>
>The fun thing is, there's a difference between these two loop nests:
>
> for (i) for (j) a[i][0] = f(a[i+1][0]);
> for (i) for (j) b[i][j] = f(a[i+1][j]);
What about
B[i][j/2]...
? It's really surprising that only invariants are special here.
>Even though the distance vector for the read/write in the single
>statement
>is (-1,0) for both loops, unroll-and-jam is valid for the second but
>not
>for the first.
>From gcc-bugs-return-650395-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 07:27:46 2019
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Subject: [Bug c/91373] gcc6.2.0: ((U32)((U16 * U16)) >> 31) cannot always get correct result with gcc -O2
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>but it's a burden that tool need user to explicitly cast it too follow the implicit rule, isn't it?
Except that is what the language says. It is like saying a natural language
rules dont need to be followed (well maybe a bad example because natural
language rules are broken all the time).
>From gcc-bugs-return-650396-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 07:32:05 2019
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Subject: [Bug c/91373] gcc6.2.0: ((U32)((U16 * U16)) >> 31) cannot always get correct result with gcc -O2
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--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>If GCC need to follow rule, it should not be relative to GCC optimization.
So there are two rules here getting involved. One is the implicit promoting to
int. The second rule is that signed integer overflow is undefined.
It is the second rule which you are running into. Gcc only takes into account
the undefined behavior (at runtime) while compiling with optimization. If you
want gcc to say signed integer to have defined behavior for overflow
(wrapping), then you can use the -fwrapv option.
>From gcc-bugs-return-650397-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 07:39:58 2019
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Subject: [Bug c/91373] gcc6.2.0: ((U32)((U16 * U16)) >> 31) cannot always get correct result with gcc -O2
Date: Tue, 06 Aug 2019 07:39:00 -0000
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--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
Note that gcc (like clang) provides a tool to help you detect this kind of
issue. If you compile with -fsanitize=undefined, then at runtime you will see:
main.c:7:20: runtime error: signed integer overflow: 63139 * 36032 cannot be
represented in type 'int'
>From gcc-bugs-return-650398-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 07:53:08 2019
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Subject: [Bug libstdc++/91356] Poor optimization of calls involving std::unique_ptr
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--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Niels Möller from comment #2)
> (In reply to Jonathan Wakely from comment #1)
> > The ABI dictates the calling conventions and there's certainly nothing that
> > libstdc++ can do about it.
>
> My impression was that C++ ABI is under the control of compiler and C++
> standard library, and that there is no such thing as a standard C++ ABI.
Most compilers (not all, in particular not Microsoft) use the strangely named
Itanium C++ ABI.
> As evidenced by the (rare) ABI breaks in libstdc++, and the difficulty of
> linking C++ objects compiled with different C++ compilers (e.g, g++ and
> clang++).
It is an ABI for the language, not the library. g++ and clang++ are supposed to
be compatible, as long as you use the same standard library for both.
> So if
> it's really not feasible to improve the situation at all for gnu/linux
> x86_64 elf targets, *please* try to keep std::unique_ptr in mind when
> involved in ABI design for other targets.
There are indeed sometimes discussions about a V2 of the ABI, for new targets
or those that can afford to break ABI compatibility.
> For specific types defined by the GNU standard C++ library, it may also be
> possible to add any needed G++ specific attributes in library headers to
> tell the compiler to depart from the "standard" ABI.
clang has such an attribute [[clang::trivial_abi]], p1029 is trying to
standardize it. But adding it in the library now would be an ABI break, which
the maintainers are strongly opposed to :-(
> In my experience (mainly from working on the webrtc.org code, where
> implementation inheritance is discouraged), it's common with implementations
> of interface classes consisting of almost trivial implementations of the
> interface's virtual functions, which only setup the correct arguments for
> calling a non-inlined (and possibly virtual) method on some member to do the
> real work.
virtual doesn't always prevent inlining (but it often does indeed).
>From gcc-bugs-return-650399-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 08:09:50 2019
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Subject: [Bug target/91142] [9 Regression] Incorrect aligned vector load instruction emitted because of vinserti32x4 elision
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Martin Kronbichler <kronbichler.martin at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kronbichler.martin at gmail dot co
| |m
--- Comment #2 from Martin Kronbichler <kronbichler.martin at gmail dot com> ---
The fix is due to PR90991.
>From gcc-bugs-return-650400-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 08:19:17 2019
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Subject: [Bug lto/91375] New: [8/9/10 Regression] ICE on valid code in subbinfo_with_vtable_at_offset at ipa-devirt.c:2760 since r256685
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91375
Bug ID: 91375
Summary: [8/9/10 Regression] ICE on valid code in
subbinfo_with_vtable_at_offset at ipa-devirt.c:2760
since r256685
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Starting from the revision I see the following ICE:
$ cat 1.ii
class BDS_Mesh {
virtual ~BDS_Mesh();
};
BDS_Mesh::~BDS_Mesh() {}
$ cat 2.ii
class BDS_Mesh {
public:
virtual ~BDS_Mesh();
};
void fn1() {
BDS_Mesh *m = new BDS_Mesh;
for (;;)
delete m;
}
$ g++ 1.ii -c -O0 -flto -shared -fPIC && g++ 2.ii -c -O2 -flto -shared -fPIC &&
g++ 1.o 2.o -shared
during GIMPLE pass: fre
2.ii: In function ‘fn1’:
2.ii:5:6: internal compiler error: Segmentation fault
5 | void fn1() {
| ^
0xc84b5f crash_signal
/home/marxin/Programming/gcc/gcc/toplev.c:326
0x7f130c4e1e4f ???
/usr/src/debug/glibc-2.29-7.3.x86_64/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0xa6fcdd tree_check(tree_node*, char const*, int, char const*, tree_code)
/home/marxin/Programming/gcc/gcc/tree.h:3256
0xa6fcdd subbinfo_with_vtable_at_offset(tree_node*, unsigned long, tree_node*)
/home/marxin/Programming/gcc/gcc/ipa-devirt.c:2760
0xa920b6 extr_type_from_vtbl_ptr_store
/home/marxin/Programming/gcc/gcc/ipa-polymorphic-call.c:1321
0xa920b6 check_stmt_for_type_change
/home/marxin/Programming/gcc/gcc/ipa-polymorphic-call.c:1522
0xd85048 walk_aliased_vdefs_1
/home/marxin/Programming/gcc/gcc/tree-ssa-alias.c:3466
0xd850ee walk_aliased_vdefs_1
/home/marxin/Programming/gcc/gcc/tree-ssa-alias.c:3449
0xd8519f walk_aliased_vdefs(ao_ref*, tree_node*, bool (*)(ao_ref*, tree_node*,
void*), void*, bitmap_head**, bool*, unsigned int)
/home/marxin/Programming/gcc/gcc/tree-ssa-alias.c:3488
0xa91672 ipa_polymorphic_call_context::get_dynamic_type(tree_node*, tree_node*,
tree_node*, gimple*, unsigned int*)
/home/marxin/Programming/gcc/gcc/ipa-polymorphic-call.c:1736
0xe3b4a2 eliminate_dom_walker::eliminate_stmt(basic_block_def*,
gimple_stmt_iterator*)
/home/marxin/Programming/gcc/gcc/tree-ssa-sccvn.c:5739
0xe3c61d eliminate_dom_walker::before_dom_children(basic_block_def*)
/home/marxin/Programming/gcc/gcc/tree-ssa-sccvn.c:5898
0xe3c61d eliminate_dom_walker::before_dom_children(basic_block_def*)
/home/marxin/Programming/gcc/gcc/tree-ssa-sccvn.c:5831
0x14b3367 dom_walker::walk(basic_block_def*)
/home/marxin/Programming/gcc/gcc/domwalk.c:309
0xe350bb eliminate_with_rpo_vn(bitmap_head*)
/home/marxin/Programming/gcc/gcc/tree-ssa-sccvn.c:6076
0xe44708 do_rpo_vn
/home/marxin/Programming/gcc/gcc/tree-ssa-sccvn.c:7221
0xe452f8 execute
/home/marxin/Programming/gcc/gcc/tree-ssa-sccvn.c:7303
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
make: *** [/tmp/cc5CSQUP.mk:2: /tmp/cc9Jtc0u.ltrans0.ltrans.o] Error 1
lto-wrapper: fatal error: make returned 2 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
>From gcc-bugs-return-650401-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 08:19:42 2019
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Subject: [Bug lto/91375] [8/9/10 Regression] ICE on valid code in subbinfo_with_vtable_at_offset at ipa-devirt.c:2760 since r256685
Date: Tue, 06 Aug 2019 08:19:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-06
CC| |rguenth at gcc dot gnu.org
Known to work| |7.4.0
Target Milestone|--- |8.4
Ever confirmed|0 |1
Known to fail| |10.0, 8.3.0, 9.1.0
>From gcc-bugs-return-650404-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 08:24:43 2019
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Subject: [Bug target/90991] [9/10 Regression] _mm_loadu_ps instrinsic translates to vmovaps in combination with _mm512_insertf32x4
Date: Tue, 06 Aug 2019 08:24:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kretz at kde dot org
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
*** Bug 91142 has been marked as a duplicate of this bug. ***
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Subject: [Bug target/91142] [9 Regression] Incorrect aligned vector load instruction emitted because of vinserti32x4 elision
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I can confirm r272674 fixed that, but that has been backported to 9.2 two days
after that in r272803.
*** This bug has been marked as a duplicate of bug 90991 ***
>From gcc-bugs-return-650402-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 08:24:37 2019
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Subject: [Bug target/90991] [9/10 Regression] _mm_loadu_ps instrinsic translates to vmovaps in combination with _mm512_insertf32x4
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-650405-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 09:19:16 2019
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Subject: [Bug c/91092] Error on implicit function declarations by default
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--- Comment #13 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
By "implicit function declarations", does this include K&R style declarations?
I've found out a few days ago that GMP still uses K&R style declarations, and
that's in a configure script. The issue is that there is a potential type
mismatch between the caller (long) and the callee (unsigned int), and GCC fails
to generate "correct" code in such a case.
>From gcc-bugs-return-650406-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 09:19:51 2019
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Subject: [Bug middle-end/91358] Wrong code with dynamic allocation and optional like class
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--- Comment #2 from Antony Polukhin <antoshkka at gmail dot com> ---
(In reply to Michael Matz from comment #1)
> So, if you've seen a real problem somewhere (and not just valgrind
> complaining about uninitialized registers in comparisons),
> then you've reduced the testcase too much.
The original test case was not hitting the abort. Only the valgrind was
complaining. Original test case uses boost::variant, boost::optional and
std::vector, so it's quite hard to analyze. Part of the assembly with two
checks after the delete looks quite the same.
Valgrind complains are distracting. GDB entering the destructor is missleading.
Is there a simple way to change the GCC codegen to avoid the issue and not
affect performance?
Otherwise, is there some kind of a pattern that valgrind/gdb could detect to
avoid false positives?
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Subject: [Bug c++/41423] missing warning for an uncallable function template
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I'm not aware of an existing one that would be suitable.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/91356] Poor optimization of calls involving std::unique_ptr
Date: Tue, 06 Aug 2019 09:54:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |WONTFIX
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Niels Möller from comment #2)
> My impression was that C++ ABI is under the control of compiler and C++
> standard library, and that there is no such thing as a standard C++ ABI.
See http://itanium-cxx-abi.github.io/cxx-abi/
> For specific types defined by the GNU standard C++ library, it may also be
> possible to add any needed G++ specific attributes in library headers to
> tell the compiler to depart from the "standard" ABI.
Not without changing the existing ABI.
> > In any case, how common is it to have a pointless non-inline baz function
> > which does nothing but forward to another non-inline function?
>
> In my experience (mainly from working on the webrtc.org code, where
> implementation inheritance is discouraged), it's common with implementations
> of interface classes consisting of almost trivial implementations of the
> interface's virtual functions, which only setup the correct arguments for
> calling a non-inlined (and possibly virtual) method on some member to do the
> real work.
Why wouldn't you take unique_ptr<T>&& instead of passing by value?
I'm closing this bug, as there's nothing libstdc++ can do here.
>From gcc-bugs-return-650409-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 10:00:53 2019
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Subject: [Bug c/91373] gcc6.2.0: ((U32)((U16 * U16)) >> 31) cannot always get correct result with gcc -O2
Date: Tue, 06 Aug 2019 10:00:00 -0000
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
And Bugzilla asks you to read https://gcc.gnu.org/bugs before creating a new
bug, and that page asks you to try -fsanitize=undefined to see if your code is
undefined. If you'd done that you'd have been told your code is undefined.
>From gcc-bugs-return-650410-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 10:05:18 2019
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From: "fw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/91092] Error on implicit function declarations by default
Date: Tue, 06 Aug 2019 10:05:00 -0000
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--- Comment #14 from Florian Weimer <fw at gcc dot gnu.org> ---
(In reply to Vincent Lefèvre from comment #13)
> By "implicit function declarations", does this include K&R style
> declarations?
No, there is nothing implicit about them.
> I've found out a few days ago that GMP still uses K&R style declarations,
> and that's in a configure script. The issue is that there is a potential
> type mismatch between the caller (long) and the callee (unsigned int), and
> GCC fails to generate "correct" code in such a case.
GNU CC has supported an extension for many, many years where a K&R function
*definition* with a prior function prototype in scope behaves exactly as a
prototype-style function definition. (On some targets, the two have
substantially different ABIs, beyond how parameters are handled.)
Since the GMP headers use prototypes (they have to, otherwise they would not be
compatible with C++ compilers), GMP necessarily relies on this extension today.
But that really hasn't got to do any with implicit function declarations.
>From gcc-bugs-return-650411-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 10:46:24 2019
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/91092] Error on implicit function declarations by default
Date: Tue, 06 Aug 2019 10:46:00 -0000
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--- Comment #15 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to Florian Weimer from comment #14)
> (In reply to Vincent Lefèvre from comment #13)
> > By "implicit function declarations", does this include K&R style
> > declarations?
>
> No, there is nothing implicit about them.
OK, but the issue is similar: in both cases, the parameters/arguments are not
checked, yielding undefined behavior, so that they fall in the same class.
> > I've found out a few days ago that GMP still uses K&R style declarations,
> > and that's in a configure script. The issue is that there is a potential
> > type mismatch between the caller (long) and the callee (unsigned int), and
> > GCC fails to generate "correct" code in such a case.
>
> GNU CC has supported an extension for many, many years where a K&R function
> *definition* with a prior function prototype in scope behaves exactly as a
> prototype-style function definition. (On some targets, the two have
> substantially different ABIs, beyond how parameters are handled.)
Actually I meant K&R function definition (with no previous prototype).
> Since the GMP headers use prototypes (they have to, otherwise they would not
> be compatible with C++ compilers), GMP necessarily relies on this extension
> today.
That's in its configure script, unrelated to gmp.h.
I can see old PR26732 and PR48091 about K&R function definition, but both are
about warnings only.
>From gcc-bugs-return-650412-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 10:53:10 2019
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Subject: [Bug c/91373] gcc6.2.0: ((U32)((U16 * U16)) >> 31) cannot always get correct result with gcc -O2
Date: Tue, 06 Aug 2019 10:53:00 -0000
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--- Comment #7 from Qiang <qiang.fu at verisilicon dot com> ---
Sorry to be a bother and thanks all of you.
'-fsanitize=undefined' & '-fwrapv' are new item to me.
'-fsanitize=undefined' is helpful to me to find out the similar issue in our
code.
'-fwrapv' may hide other potential issue.
I'll do more check later follow the following instructions before reporting a
bug:
'Before reporting that GCC compiles your code incorrectly, compile it with
gcc -Wall -Wextra and see whether this shows anything wrong with your code.
Similarly, if compiling with -fno-strict-aliasing -fwrapv
-fno-aggressive-loop-optimizations makes a difference, or if compiling with
-fsanitize=undefined produces any run-time errors, then your code is probably
not correct.'
>From gcc-bugs-return-650413-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 10:57:09 2019
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From: "nisse at lysator dot liu.se" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/91356] Poor optimization of calls involving std::unique_ptr
Date: Tue, 06 Aug 2019 10:57:00 -0000
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--- Comment #5 from Niels Möller <nisse at lysator dot liu.se> ---
(In reply to Jonathan Wakely from comment #4)
> Why wouldn't you take unique_ptr<T>&& instead of passing by value?
Because passing unique_ptr (and other move-only types) by value seems to be the
mainstream idiomatic way to pass around ownership in C++. I'm confident I could
save 0.05% binary size on webrtc's AppRTCMobile.apk by passing unique_ptr<T>&&
everywhere. But my closest C++ experts consider that not a good enough reason
to depart from the more mainstream idiom, and I think they have a good point.
Maybe it's a revival of the old Lisp tradition to write code for clarity, and
in case the compiler generates poor code, just put your faith in future
compiler improvements.
> I'm closing this bug, as there's nothing libstdc++ can do here.
Any improvement needs cooperation between g++ and libstdc++; I was hoping this
bug report would reach relevant people involved on both sides.
>From gcc-bugs-return-650414-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 11:30:40 2019
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From: "ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/91376] New: g++.dg/lto/pr90990 FAILs with gld 2.32.51
Date: Tue, 06 Aug 2019 11:30:00 -0000
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Bug ID: 91376
Summary: g++.dg/lto/pr90990 FAILs with gld 2.32.51
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: hubicka at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
Target: sparc-sun-solaris2.11, i386-pc-solaris2.11,
ia64-suse-linux-gnu, powerpc64le-unknown-linux-gnu,
pru-unknown-elf
I've just tried Solaris/SPARC and x86 bootstraps with gas and gld from binutils
master. Doing so revealed a failure not present when using gas/gld 2.32:
+FAIL: g++.dg/lto/pr90990 cp_lto_pr90990_0.o-cp_lto_pr90990_0.o link, -O0 -flto
-flto-partition=none -fuse-linker-plugin
+FAIL: g++.dg/lto/pr90990 cp_lto_pr90990_0.o-cp_lto_pr90990_0.o link, -O0 -flto
-fuse-linker-plugin -fno-fat-lto-objects
+FAIL: g++.dg/lto/pr90990 cp_lto_pr90990_0.o-cp_lto_pr90990_0.o link, -O2 -flto
-flto-partition=none -fuse-linker-plugin -fno-fat-lto-objects
+FAIL: g++.dg/lto/pr90990 cp_lto_pr90990_0.o-cp_lto_pr90990_0.o link, -O2 -flto
-fuse-linker-plugin
The tests FAIL with
/vol/gcc/bin/gld-2.32.51: g++-dg-lto-pr90990-01.exe.lto.o: plugin needed to
handle lto object
Just replacing gld-2.32.51 with gld-2.32 makes the failure go away. I don't
believe that this is a traget issue, though, because on gcc-testresults there
are reports of the same failure on Linux/ia64, Linux/powerpc64le, and PRU.
It would be good to have this fixed before binutils 2.33 hit the streets.
>From gcc-bugs-return-650415-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 11:30:51 2019
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
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From: "fw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/91092] Error on implicit function declarations by default
Date: Tue, 06 Aug 2019 11:45:00 -0000
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--- Comment #16 from Florian Weimer <fw at gcc dot gnu.org> ---
(In reply to Vincent Lefèvre from comment #15)
> (In reply to Florian Weimer from comment #14)
> > (In reply to Vincent Lefèvre from comment #13)
> > > By "implicit function declarations", does this include K&R style
> > > declarations?
> >
> > No, there is nothing implicit about them.
>
> OK, but the issue is similar: in both cases, the parameters/arguments are
> not checked, yielding undefined behavior, so that they fall in the same
> class.
I wouldn't say that. If the function has a return type of int and you use the
correct argument types, the behavior is well-defined. It's just very easy to
create portability hazards this way.
> > > I've found out a few days ago that GMP still uses K&R style declarations,
> > > and that's in a configure script. The issue is that there is a potential
> > > type mismatch between the caller (long) and the callee (unsigned int), and
> > > GCC fails to generate "correct" code in such a case.
> >
> > GNU CC has supported an extension for many, many years where a K&R function
> > *definition* with a prior function prototype in scope behaves exactly as a
> > prototype-style function definition. (On some targets, the two have
> > substantially different ABIs, beyond how parameters are handled.)
>
> Actually I meant K&R function definition (with no previous prototype).
If you call such functions (old-style function definitions without a prototype
in scope) via a prototype declaration, this will result in stack corruption on
some targets (notably little-endian POWER). The stack corruption is often
subtle and hard to spot.
>From gcc-bugs-return-650417-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 11:58:03 2019
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/91092] Error on implicit function declarations by default
Date: Tue, 06 Aug 2019 11:58:00 -0000
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--- Comment #17 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to Florian Weimer from comment #16)
> (In reply to Vincent Lefèvre from comment #15)
> > OK, but the issue is similar: in both cases, the parameters/arguments are
> > not checked, yielding undefined behavior, so that they fall in the same
> > class.
>
> I wouldn't say that. If the function has a return type of int and you use
> the correct argument types, the behavior is well-defined.
Just like with implicit function declarations. In both cases (implicit function
declarations and K&R function definitions), there are correct ways to use them,
but in general, this is just too dangerous.
> > Actually I meant K&R function definition (with no previous prototype).
>
> If you call such functions (old-style function definitions without a
> prototype in scope) via a prototype declaration, this will result in stack
> corruption on some targets (notably little-endian POWER). The stack
> corruption is often subtle and hard to spot.
32-bit x86 is affected too.
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Subject: [Bug tree-optimization/91351] [9/10 Regression] -fstrict-enums generates incorrect code
Date: Tue, 06 Aug 2019 12:00:00 -0000
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #3)
> Switch lowering produces things like
>
> _6 = e_2(D) + 4294967285;
> if (_6 > 2)
>
> for range checking, where _6 has type enum E, and VRP2 later takes advantage
> of strict enum to assume that _6 cannot be large. It seems like the range
> check should use a type that is not an enum.
>
> (the bisection result makes little sense to me)
The bisection point is correct, if I apply following patch:
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 716d7397b49..321d3d7db66 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -7174,7 +7174,7 @@ fold_plusminus_mult_expr (location_t loc, enum tree_code
code, tree type,
if (!same)
return NULL_TREE;
- if (! ANY_INTEGRAL_TYPE_P (type)
+ if (! INTEGRAL_TYPE_P (type)
|| TYPE_OVERFLOW_WRAPS (type)
/* We are neither factoring zero nor minus one. */
|| TREE_CODE (same) == INTEGER_CST)
diff --git a/gcc/tree.c b/gcc/tree.c
index efa49e99d65..33edbe7b374 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -11926,7 +11926,7 @@ int_cst_value (const_tree x)
tree
signed_or_unsigned_type_for (int unsignedp, tree type)
{
- if (ANY_INTEGRAL_TYPE_P (type) && TYPE_UNSIGNED (type) == unsignedp)
+ if (TREE_CODE (type) == INTEGER_TYPE && TYPE_UNSIGNED (type) == unsignedp)
return type;
if (TREE_CODE (type) == VECTOR_TYPE)
@@ -11940,17 +11940,6 @@ signed_or_unsigned_type_for (int unsignedp, tree type)
return build_vector_type (inner2, TYPE_VECTOR_SUBPARTS (type));
}
- if (TREE_CODE (type) == COMPLEX_TYPE)
- {
- tree inner = TREE_TYPE (type);
- tree inner2 = signed_or_unsigned_type_for (unsignedp, inner);
- if (!inner2)
- return NULL_TREE;
- if (inner == inner2)
- return type;
- return build_complex_type (inner2);
- }
-
unsigned int bits;
if (INTEGRAL_TYPE_P (type)
|| POINTER_TYPE_P (type)
the issue is gone.
For the problematic condition vrp really does folding:
Folding statement: e_8 = ASSERT_EXPR <e_7, e_7 < 14>;
Not folded
Folding statement: _6 = e_8 + 4294967285; // 4294967285 == -11
Not folded
Folding statement: if (_6 > 2)
Folding predicate _6 > 2 to 0
Folded into: if (0 != 0)
It does not look correct to me, I use an unsigned type with precision 5 bits
and the expression should be true for e_8 == 11 for example.
Marc?
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Subject: [Bug c/91092] Error on implicit function declarations by default
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--- Comment #18 from Rich Felker <bugdal at aerifal dot cx> ---
Just to clarify, an "implicit function declaration" is use of a token that
could be an identifier as the operand of the function call operator (), with no
declaration for the identifier in scope. A non-prototype declaration is still a
declaration.
The specific language from C89 supporting implicit function declarations is in
3.3.2.2 ¶4:
"If the expression that precedes the parenthesized argument list in a function
call consists solely of an identifier, and if no declaration is visible for
this identifier, the identifier is implicitly declared exactly as if, in the
innermost block containing the function call, the declaration
extern int identifier();
appeared."
Later versions of the standard do not have such a special case; the operand has
to be a valid expression with function pointer type.
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Patch candidate:
https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00355.html
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Subject: [Bug c/91092] Error on implicit function declarations by default
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--- Comment #19 from Rich Felker <bugdal at aerifal dot cx> ---
Re comment 17, non-prototype declarations might be error-prone, but they're
valid C and necessary for certain usage cases. The motivation for making this
error-by-default is that "implicit function declarations" are not valid C (for
2 decades now) and have no valid usage cases (nothing they admit that could not
be done without them).
You can use -Wstrict-prototypes (or -Werror=strict-prototypes) if you want to
be warned (or error out) for use of non-prototype declarations.
You can use -Wold-style-definition (or -Werror= old-style-definition) if you
want to be warned (or error out) for K&R style function definitions.
Both of these are only tangentially related to this bt entry.
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From: "gcc.j.kelling at hzdr dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91377] New: (regression) ICE with non-static block scope constexpr, captured in lambda, used as template parameter
Date: Tue, 06 Aug 2019 12:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91377
Bug ID: 91377
Summary: (regression) ICE with non-static block scope
constexpr, captured in lambda, used as template
parameter
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gcc.j.kelling at hzdr dot de
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Created attachment 46677
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46677&action=edit
gcc 9.1.0 output (make.out) and prprocessed source (main.cpp)
The attached code (main.cpp) triggers an internal compiler error with gcc 9.1.0
but works with gcc 7.3.0.
./include/pmacc/particles/ParticlesBase.kernel:1334:32: internal compiler
error: in lookup_template_class_1, at cp/pt.c:9545
1334 | DataSpace< dim > dstSuperCell = DataSpaceOperations
< dim - 1 > ::extend(
| ^~~
(full message in make.out in attachment, line 221666 in preprocessed code)
The reported line is in the body of a lambda, passed to a function template.
The surrounding scope is the body of a function template, in which `dim` is
declared as constexpr in line 221564 in the preprocessed code. When adding
`static` to this constexpr declaration the code compiles in gcc 9.1.0.
I failed to produce a minimal example.
>From gcc-bugs-return-650424-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 12:49:13 2019
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/91305] ICF compile-time issues
Date: Tue, 06 Aug 2019 12:49:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |WONTFIX
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
I've just run perf and I can just slightly some ICF functions:
0.37% cc1 cc1 [.] ipa_icf::sem_function::compare_phi_node
0.18% cc1 cc1 [.] ipa_icf_gimple::func_checker::compare_edge
0.14% cc1 cc1 [.] ipa_icf_gimple::func_checker::compare_operand
0.08% cc1 cc1 [.] ipa_icf_gimple::func_checker::compare_ssa_name
but anything obviously slow..
>From gcc-bugs-return-650426-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 12:54:32 2019
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From: "matz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/91358] Wrong code with dynamic allocation and optional like class
Date: Tue, 06 Aug 2019 12:54:00 -0000
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--- Comment #3 from Michael Matz <matz at gcc dot gnu.org> ---
(In reply to Antony Polukhin from comment #2)
> (In reply to Michael Matz from comment #1)
> Valgrind complains are distracting. GDB entering the destructor is
> missleading. Is there a simple way to change the GCC codegen to avoid the
> issue and not affect performance?
The only way I see would be to emit the jumpy sequence that RTL generates
(sometimes) from "if (x & y)" in the opposite order. There's no real reason
within the intermediate form to prefer one or the other, but it might help in
practice. (The problem will be that there's also no reason that would prevent
GCC from transforming "x & y" into "y & x", e.g. for canonicalization, and then
the other order would create the problem).
> Otherwise, is there some kind of a pattern that valgrind/gdb could detect to
> avoid false positives?
I don't really see any, no good idea here :-/
>From gcc-bugs-return-650425-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 12:54:08 2019
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/91351] [9/10 Regression] -fstrict-enums generates incorrect code
Date: Tue, 06 Aug 2019 12:54:00 -0000
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--- Comment #8 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #7)
> --- a/gcc/tree.c
> +++ b/gcc/tree.c
> @@ -11926,7 +11926,7 @@ int_cst_value (const_tree x)
> tree
> signed_or_unsigned_type_for (int unsignedp, tree type)
> {
> - if (ANY_INTEGRAL_TYPE_P (type) && TYPE_UNSIGNED (type) == unsignedp)
> + if (TREE_CODE (type) == INTEGER_TYPE && TYPE_UNSIGNED (type) == unsignedp)
> return type;
Ah, that's probably the part that makes a difference. Going from
INTEGRAL_TYPE_P to ANY_INTEGRAL_TYPE_P can't have any impact since there are no
complex or vector. But going from == INTEGER_TYPE to INTEGRAL_TYPE_P adds
booleans and enums.
It isn't completely obvious that it is wrong to return the enum type itself if
we are not asking for a sign change, but I guess from likely uses of the
function it would be safer to always return an integer type. So I guess we
could change this ANY_INTEGRAL_TYPE_P (type) to (TREE_CODE (type) ==
INTEGER_TYPE || ((TREE_CODE (type) == COMPLEX_TYPE || VECTOR_TYPE_P (type)) &&
TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE) or something like that.
I am afraid there are likely other places where we check if a type is unsigned
(or has wrapping overflow) and start doing arithmetic on it that conflicts with
the strict-enum restrictions.
Does the enum really have a precision of 5 bits? I would have expected
(1<<5)-11 instead of 4294967285 (i.e. (1<<32)-11), without looking at it too
closely.
>From gcc-bugs-return-650427-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 13:11:50 2019
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Subject: [Bug middle-end/90597] [9/10 Regression] FAIL: gcc.dg/attr-vector_size.c (internal compiler error)
Date: Tue, 06 Aug 2019 13:11:00 -0000
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--- Comment #5 from dave.anglin at bell dot net ---
On 2019-08-05 10:45 p.m., msebor at gcc dot gnu.org wrote:
> --- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
> pr89797 reported a similar (but not quite the same) ICE in the aarch64
> back-end. Maybe the hppa64 back-end needs a similar tweak to keep the
> assertion from failing.
Will check this weekend.
>From gcc-bugs-return-650428-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 13:49:26 2019
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/91356] Poor optimization of calls involving std::unique_ptr
Date: Tue, 06 Aug 2019 13:49:00 -0000
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No, it needs co-operation between G++ and all other compilers using the same
ABI, which makes it out of scope for GCC's bugzilla. G++ cannot unilaterally
change the ABI here, and even if we could, libstdc++ would not take advantage
of it because it would break the library's stable ABI. So WONTFIX.
>From gcc-bugs-return-650430-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 13:57:52 2019
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Subject: [Bug c++/91378] [9/10 regression] [C++17] ICE in type_dependent_expression_p with noexcept and deduced return type
Date: Tue, 06 Aug 2019 13:57:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-08-06
Ever confirmed|0 |1
>From gcc-bugs-return-650429-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 13:57:38 2019
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Subject: [Bug c++/91378] New: [9/10 regression] [C++17] ICE in type_dependent_expression_p with noexcept and deduced return type
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Bug ID: 91378
Summary: [9/10 regression] [C++17] ICE in
type_dependent_expression_p with noexcept and deduced
return type
Product: gcc
Version: 9.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
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// { dg-do compile { target c++14 } }
struct B
{
int i;
};
struct C
{
template <class T> static auto
g(B b) noexcept(noexcept(b.i)) { }
};
template <class T>
void h(T t)
{
C::g<int>({});
}
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Subject: [Bug libstdc++/91371] std::bind and bind_front don't work with function with call convention
Date: Tue, 06 Aug 2019 13:59:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2019-08-06
Ever confirmed|0 |1
>From gcc-bugs-return-650432-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 14:08:35 2019
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Subject: [Bug c++/91378] [9/10 regression] [C++17] ICE in type_dependent_expression_p with noexcept and deduced return type
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--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue Aug 6 14:07:59 2019
New Revision: 274143
URL: https://gcc.gnu.org/viewcvs?rev=274143&root=gcc&view=rev
Log:
PR c++/91378 - ICE with noexcept and auto return type.
Here, since the call to g is not type-dependent, we call mark_used on it to
determine its return type. This also wants to instantiate the
noexcept-expression. But since nothing in maybe_instantiate_noexcept was
calling push_to_top_level, we substituted b.i with processing_template_decl
set, so we left it unresolved for later access checking. As a result, the
type of C::g<int> remained instantiation-dependent, leading to an ICE in
type_dependent_expression_p on the assert that the type of a function
template with no dependent template arguments must be non-dependent.
* pt.c (maybe_instantiate_noexcept): push_to_top_level.
Added:
trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn56.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/pt.c
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Subject: [Bug c++/67225] [concepts] Expression constraint with a constrained result turns off access checking
Date: Tue, 06 Aug 2019 14:16:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> ---
This is fixed on the concepts-cxx2a branch.
>From gcc-bugs-return-650434-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 14:17:45 2019
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Subject: [Bug libstdc++/91371] std::bind and bind_front don't work with function with call convention
Date: Tue, 06 Aug 2019 14:17:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The problem is not with bind and bind_front, it's that std::is_function doesn't
recognize such a function, and so std::decay doesn't know what to do with it:
#include <functional>
int bar(int) __attribute__((ms_abi)); //same with fastcall, thiscall
static_assert(std::is_function<decltype(bar)>::value, "");
static_assert(std::is_pointer<std::decay_t<decltype(bar)>>::value, "");
Libstdc++ specializes std::is_function for every type of function, but doesn't
handle alternative calling conventions. Libc++ uses a completely different
approach which detects functions by testing whether it's a non-class type that
supports implicit conversion from T& to T* (which is only true for functions).
>From gcc-bugs-return-650435-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 14:21:22 2019
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From: "mliska at suse dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/91351] [9/10 Regression] -fstrict-enums generates incorrect code
Date: Tue, 06 Aug 2019 14:21:00 -0000
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--- Comment #9 from Martin Liška <mliska at suse dot cz> ---
On 8/6/19 2:54 PM, glisse at gcc dot gnu.org wrote:
> Does the enum really have a precision of 5 bits? I would have expected
> (1<<5)-11 instead of 4294967285 (i.e. (1<<32)-11), without looking at it too
> closely.
Yep, if I see correctly:
(gdb) p debug_tree(*lhs)
<ssa_name 0x7ffff78166c0
type <enumeral_type 0x7ffff77f5f18 E
type <integer_type 0x7ffff780b000 unsigned int public unsigned SI
size <integer_cst 0x7ffff76bf0a8 constant 32>
unit-size <integer_cst 0x7ffff76bf0c0 constant 4>
align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff780b000 precision:5 min <integer_cst 0x7ffff7806378 0> max <integer_cst
0x7ffff7806390 31>>
sizes-gimplified unsigned SI size <integer_cst 0x7ffff76bf0a8 32>
unit-size <integer_cst 0x7ffff76bf0c0 4>
align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7ffff77f5f18 precision:32 min <integer_cst 0x7ffff76bf0d8 0> max <integer_cst
0x7ffff76bf090 4294967295>
values <tree_list 0x7ffff77f4488
purpose <identifier_node 0x7ffff78079c0 e0
normal local bindings <(nil)>> value <const_decl 0x7ffff780a000
e0>
chain <tree_list 0x7ffff77f44b0
purpose <identifier_node 0x7ffff7807a00 e1
normal local bindings <(nil)>> value <const_decl
0x7ffff780a070 e1>
chain <tree_list 0x7ffff77f44d8
purpose <identifier_node 0x7ffff7807a40 e2
normal local bindings <(nil)>> value <const_decl
0x7ffff780a0e0 e2>
chain <tree_list 0x7ffff77f4500
purpose <identifier_node 0x7ffff7807a80 e3
normal local bindings <(nil)>> value <const_decl
0x7ffff780a150 e3>
chain <tree_list 0x7ffff77f4528 purpose
<identifier_node 0x7ffff7807ac0 e4> value <const_decl 0x7ffff780a1c0 e4> chain
<tree_list 0x7ffff77f4550>>>>>> context <translation_unit_decl 0x7ffff76ab168
/home/marxin/Programming/testcases/pr91351.cc>
chain <type_decl 0x7ffff76cc850 E>>
def_stmt _6 = e_2(D) + 4294967285;
version:6>
So the integer_type of the enumeral_type hash precision:5 and:
min <integer_cst 0x7ffff7806378 0>
and
max <integer_cst 0x7ffff7806390 31>
which is what one would expect from -fstrict-enums.
Martin
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Subject: [Bug c++/91155] [9/10 Regression] __PRETTY_FUNCTION__ gets truncated when char template parameter is '\0'
Date: Tue, 06 Aug 2019 14:23:00 -0000
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Jason?
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Subject: [Bug c++/64679] Spurious redefinition error when parsing not-quite-most-vexing-parse declarations
Date: Tue, 06 Aug 2019 14:34:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|diagnostic |
Last reconfirmed|2017-09-28 00:00:00 |2019-8-6
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Another example that cannot be a function declaration:
struct F
{
F(int) {}
F operator()(int) const { return *this; }
};
int main()
{
int i = 0;
F(i)(0)(0);
}
vex.cc: In function 'int main()':
vex.cc:11:5: error: conflicting declaration 'F i'
11 | F(i)(0)(0);
| ^
vex.cc:10:7: note: previous declaration as 'int i'
10 | int i = 0;
| ^
vex.cc:10:7: warning: unused variable 'i' [-Wunused-variable]
Clang, EDG and MSVC all compile this.
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Subject: [Bug target/91148] PowerPC build gets several warnings due to -Wformat-diag
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--- Comment #13 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
As I noted in bug 40883 comment 8, you can detect such issues in
target-specific code by building a cross compiler using a native compiler
from the same trunk version, and configuring with --enable-werror-always
(whether with config-list.mk or otherwise), and because many targets are
only built as cross compilers it's necessary to do that to detect and fix
issues with such targets that show up as warnings when building GCC.
At <https://gcc.gnu.org/ml/gcc/2017-09/msg00258.html> I posted a board
file that can be used to disable execution testing when running the
testsuite for such a cross compiler.
It would indeed be helpful to have some packaged system for running a lot
of builds and tests like that, so you can just start it up, go away for a
while and come back to a set of all-targets test results
(contrib/config-list.mk does that if all you want is to see if the
compilers build at all, but you need to have the current trunk native
compiler already built to use it), rather than needing to set up your own
system for running lots of builds and tests - for issues compiling glibc,
build-many-glibcs.py achieves that, so people doing complicated
cross-architecture changes in glibc can now readily ensure they at least
don't break the build for any architecture. Something to discuss at the
Cauldron?
>From gcc-bugs-return-650439-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 14:46:37 2019
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Subject: [Bug libstdc++/91281] std::optional debug checks
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Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |WAITING
--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
I just realized there are already some checks since r248099. I am going to try
and find again the testcase where it wasn't working...
>From gcc-bugs-return-650440-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 14:52:34 2019
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Subject: [Bug libstdc++/91281] std::optional debug checks
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Marc Glisse <glisse at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
I am going to assume that I got confused with experimental/optional, which does
not have the checks, but it isn't worth adding them there. Sorry for the
noise...
>From gcc-bugs-return-650441-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 14:53:28 2019
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Subject: [Bug target/91130] [9/10 Regression] -MF clashes with -flto on aarch64
Date: Tue, 06 Aug 2019 14:53:00 -0000
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--- Comment #32 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I concur that passing CL_DRIVER instead of CL_LANG_ALL is correct here.
>From gcc-bugs-return-650442-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 14:58:27 2019
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Subject: =?UTF-8?B?W0J1ZyBjLzkxMTkzXSBJQ0Ugb24gaW52YWxpZDogdHJlZSBjaGVjazogZXhw?= =?UTF-8?B?ZWN0ZWQgY2xhc3Mg4oCYdHlwZeKAmSwgaGF2ZSDigJhkZWNsYXJhdGlvbg==?= =?UTF-8?B?4oCZIChmdW5jdGlvbl9kZWNsKSBpbiBncm9rZGVjbGFyYXRvciwgYXQgYy9j?= =?UTF-8?B?LWRlY2wuYzo1OTU2?Date: Tue, 06 Aug 2019 14:58:00 -0000
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Joseph S. Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-06
Target Milestone|8.4 |---
Summary|[8/9/10 regression] ICE on |ICE on invalid: tree check:
|invalid: tree check: |expected class ‘type’, have
|expected class ‘type’, have |‘declaration’
|‘declaration’ |(function_decl) in
|(function_decl) in |grokdeclarator, at
|grokdeclarator, at |c/c-decl.c:5956
|c/c-decl.c:5956 |
Ever confirmed|0 |1
--- Comment #4 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Even 2.7.2.3 ICEs here.
>From gcc-bugs-return-650443-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 15:03:13 2019
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Subject: [Bug target/91148] PowerPC build gets several warnings due to -Wformat-diag
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--- Comment #14 from Martin Sebor <msebor at gcc dot gnu.org> ---
Jeff has a setup that builds most if not all targets. I think he's also got it
hooked up to an emulator but I'm not sure he runs tests. Unfortunately,
there's no Web interface to it that we could access. It would be nice to have
it publish the results somewhere like gcc-testresults, along with a warning
summary to help with cleanup like this. Jeff should be at Cauldron this time
so it would be a good opportunity for a discussion.
>From gcc-bugs-return-650444-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 15:12:25 2019
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Subject: [Bug libstdc++/91356] Poor optimization of calls involving std::unique_ptr
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--- Comment #7 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #6)
> libstdc++ would not take
> advantage of it because it would break the library's stable ABI.
There is always this mode (is it _GLIBCXX_INLINE_VERSION? I thought I
remembered a different name) that nobody uses, that doesn't care about binary
compatibility, but can be used to experiment...
>From gcc-bugs-return-650445-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 15:16:49 2019
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Subject: [Bug c/91206] -Wformat doesn't warn for %hd with char parameter
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--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
There is a known ambiguity in the standard requirements where the argument
has the correct promoted type but not the expected type before promotion.
I wrote up some notes on this some time ago but didn't submit it as a DR.
https://www.polyomino.org.uk/computer/c/pre-dr-6a.txt
>From gcc-bugs-return-650446-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 15:24:55 2019
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Subject: [Bug c/91362] program compiled with O3 optimization give different output than without optimization
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--- Comment #3 from matic at nimp dot co.uk ---
Sorry I was not aware of "aliasing". Thanks for the pointers to solutions.
>From gcc-bugs-return-650447-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 15:36:54 2019
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Subject: [Bug middle-end/90796] [8/9/10 Regression] GCC: O2 vs O3 output differs on simple test
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--- Comment #9 from Michael Matz <matz at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #8)
> >The fun thing is, there's a difference between these two loop nests:
> >
> > for (i) for (j) a[i][0] = f(a[i+1][0]);
> > for (i) for (j) b[i][j] = f(a[i+1][j]);
>
> What about
>
> B[i][j/2]...
>
> ?
That would be a problem as well, but luckily that's not an affine function of
j,
and hence has no analyzable access function, and so isn't fused for different
reasons.
> It's really surprising that only invariants are special here.
It's the only affine functions that don't progress with each iteration. I
think, at least :)
>From gcc-bugs-return-650448-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 16:08:49 2019
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/91351] [9/10 Regression] -fstrict-enums generates incorrect code
Date: Tue, 06 Aug 2019 16:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91351
--- Comment #10 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #9)
> So the integer_type of the enumeral_type hash precision:5 and:
> min <integer_cst 0x7ffff7806378 0>
>
> and
>
> max <integer_cst 0x7ffff7806390 31>
>
> which is what one would expect from -fstrict-enums.
But the enum type itself has
precision:32 min <integer_cst 0x7ffff76bf0d8 0> max <integer_cst 0x7ffff76bf090
4294967295>
I am not surprised the compiler gets confused sometimes...
Anyway,
- if (ANY_INTEGRAL_TYPE_P (type) && TYPE_UNSIGNED (type) == unsignedp)
+ if (TREE_CODE (type) == INTEGER_TYPE && TYPE_UNSIGNED (type) == unsignedp)
(a partial revert of just this line)
or the slightly more advanced version I gave above seems to be the obvious fix
for this regression, we can always think of additional issues later.
>From gcc-bugs-return-650449-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 16:11:30 2019
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Subject: [Bug middle-end/90796] [8/9/10 Regression] GCC: O2 vs O3 output differs on simple test
Date: Tue, 06 Aug 2019 16:11:00 -0000
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--- Comment #10 from rguenther at suse dot de <rguenther at suse dot de> ---
On August 6, 2019 5:36:49 PM GMT+02:00, "matz at gcc dot gnu.org"
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90796
>
>--- Comment #9 from Michael Matz <matz at gcc dot gnu.org> ---
>(In reply to rguenther@suse.de from comment #8)
>> >The fun thing is, there's a difference between these two loop nests:
>> >
>> > for (i) for (j) a[i][0] = f(a[i+1][0]);
>> > for (i) for (j) b[i][j] = f(a[i+1][j]);
>>
>> What about
>>
>> B[i][j/2]...
>>
>> ?
>
>That would be a problem as well, but luckily that's not an affine
>function of
>j,
>and hence has no analyzable access function, and so isn't fused for
>different
>reasons.
>
>> It's really surprising that only invariants are special here.
>
>It's the only affine functions that don't progress with each iteration.
> I
>think, at least :)
Hm. At least we analyze wrapping ones, but I guess 0, 1, 0, 1 would be caught
in another way..
>From gcc-bugs-return-650450-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 16:30:41 2019
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From: "cbunch at cfhp dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgcc/91379] New: internal compiler error __gcov_fork
Date: Tue, 06 Aug 2019 16:30:00 -0000
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Bug ID: 91379
Summary: internal compiler error __gcov_fork
Product: gcc
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Created attachment 46678
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46678&action=edit
The pre-processed source for libgcov-interface.c -DL_gcov_fork
Unable to build gcc-9.1.0 (or 5.3.0, 5.5.0, 6.3.0, 6.5.0, 8.1.0)
../../../gcc-9.1.0/libgcc/libgcov-interface.c: In function '__gcov_fork':
../../../gcc-9.1.0/libgcc/libgcov-interface.c:184:1: internal compiler error:
in simplify_subreg, at simplify-rtx.c:6446
184 | }
| ^
ia64-hp-hpux11.31
'../gcc-9.1.0/configure'
'--prefix=/opt/gcc-9.1' '--with-gmp-include=/usr/local/include'
'--with-gmp-lib=
/usr/local/lib/hpux64' '--with-mpfr-include=/usr/local/include'
'--with-mpfr-lib
=/usr/local/lib/hpux64' '--with-mpc-include=/usr/local/include'
'--with-mpc-lib=
/usr/local/lib/hpux64' '--with-gnu-as' '--without-gnu-ld' '--disable-libgcj'
'--
disable-libgomp' --enable-languages=c,c++
--with-build-time-tools=/opt/binutils/
bin CC='gcc -mlp64' CXX='g++ -mlp64'
compiling with gcc-4.9.2
two code change made to get this far:
#undef MAKE_DECL_ONE_ONLY added to gcc/config/ia64/hpux.h
change FTW *ftwbuf to FTW ftwbuf in gcov-tool.c:unlink_gcda_file to match
default prototype for HP-UX (parameter is not used in function.)
>From gcc-bugs-return-650451-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 16:38:25 2019
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From: "barry.revzin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91380] New: Requesting a better diagnostic for dumb include mistake
Date: Tue, 06 Aug 2019 16:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91380
Bug ID: 91380
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mistake
Product: gcc
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We just had an example in our codebase which did the moral equivalent of:
#include "<vector>"
gcc's diagnostic for this is:
<source>:1:10: fatal error: <vector>: No such file or directory
1 | #include "<vector>"
| ^~~~~~~~~~
It's very subtle to notice that we accidentally used both ""s and <>s (indeed
we spent a significant amount of time trying to figure out why the file
couldn't be found despite definitely being there... the real example used a
non-system header).
clang's diagnostic for this is:
<source>:1:10: error: '<vector>' file not found, did you mean 'vector'?
#include "<vector>"
^~~~~~~~~~
"vector"
It's not based on knowing what vector is, it gives equivalently good
diagnostics based on actually search include paths. e.g. if I put a foo.h in
include/ and run clang++ -c foo.cxx -Iinclude where I'm trying to #include
"<foo.h>" I get:
foo.cxx:1:10: error: '<foo.h>' file not found, did you mean 'foo.h'?
#include "<foo.h>"
^~~~~~~~~
"foo.h"
This is super low priority, but I figure somebody else may have run into this
problem in the past and also spent a while ripping their hair out as to why
some file couldn't be found, so I thought I'd at least get it on your radar.
Thank you.
>From gcc-bugs-return-650452-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 16:43:41 2019
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Subject: [Bug c++/91380] Requesting a better diagnostic for dumb include mistake
Date: Tue, 06 Aug 2019 16:43:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-06
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
Could be fixed in parse_include, methinks.
>From gcc-bugs-return-650453-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 16:46:14 2019
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/91226] wrong propagation of non-canonical _Decimal64 constant
Date: Tue, 06 Aug 2019 16:46:00 -0000
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--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
This appears to be a bug in libdecnumber/bid/bid2dpd_dpd2bid.c.
_bid_to_dpd32 checks for a too-large significand, but _bid_to_dpd64 does
not. Furthermore, _bid_to_dpd128 has the same bug of not checking for
too-large significands, as shown by the following test (which outputs 0
without optimization, which is correct, but 8e+33 with -O2, which is
wrong). (_bid_to_dpd128 also doesn't check at all for the case where the
first four bits of the combination field are 1100, 1101 or 1110, in which
case the significand is always too large and so the value is always a
noncanonical zero.)
#include <stdio.h>
union u
{
_Decimal128 d128;
unsigned __int128 u128;
};
#define U128(hi, lo) (((unsigned __int128) lo) \
| (((unsigned __int128) hi) << 64))
int
main (void)
{
unsigned __int128 i = U128 (0x3041ed09bead87c0ULL, 0x378d8e6400000001ULL);
union u x;
_Decimal128 d;
x.u128 = i;
d = x.d128;
printf ("%g\n", (double) d);
return 0;
}
>From gcc-bugs-return-650454-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 16:50:18 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/91226] wrong propagation of non-canonical _Decimal64 and _Decimal128 constant (BID only)
Date: Tue, 06 Aug 2019 16:50:00 -0000
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Joseph S. Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-06
Summary|wrong propagation of |wrong propagation of
|non-canonical _Decimal64 |non-canonical _Decimal64
|constant |and _Decimal128 constant
| |(BID only)
Ever confirmed|0 |1
--- Comment #2 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Thus, confirmed.
>From gcc-bugs-return-650455-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 17:24:50 2019
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Subject: [Bug debug/91381] New: ARM NEON register variable DWARF incorrect
Date: Tue, 06 Aug 2019 17:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91381
Bug ID: 91381
Summary: ARM NEON register variable DWARF incorrect
Product: gcc
Version: 7.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: calum.west at analog dot com
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When producing debug information for a 128-bit Q register variable using Q8 and
above, the debug information produced incorrectly repeats the same D register
twice as the operand of the DW_OP_piece operation.
Example ( using 8.3-2019.03 found on arm.com ):
/***main.c***/
#include <arm_neon.h>
#include <stdint.h>
int main()
{
register uint32x4_t neon_reg asm ("q8") = {1,2,3,4};
return 0;
}
/************/
$./arm-eabi-g++ -g -mcpu=cortex-a5 -mfloat-abi=hard --specs=nosys.specs main.c
-o main.o
$ ./arm-eabi-objdump.exe -g main.o
...
<2><e6>: Abbrev Number: 8 (DW_TAG_variable)
<e7> DW_AT_name : (indirect string, offset: 0x147): neon_reg
<eb> DW_AT_decl_file : 1
<ec> DW_AT_decl_line : 11
<ed> DW_AT_decl_column : 24
<ee> DW_AT_type : <0xad>
<f2> DW_AT_location : 10 byte block: 90 90 2 93 8 90 90 2 93 8
(DW_OP_regx: 272 (r272); DW_OP_piece: 8; DW_OP_regx: 272 (r272); DW_OP_piece:
8)
...
This last attribute should be (DW_OP_regx: 272 (r272); DW_OP_piece: 8;
DW_OP_regx: 273 (r273); DW_OP_piece: 8) and similar for other registers >Q8.
Registers <Q8 appear to work correctly.
I've briefly tested on different versions and with different variations of the
g-dwarf($version) and g-strictdwarf switch and found the same results.
>From gcc-bugs-return-650456-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 17:41:06 2019
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/67224] UTF-8 support for identifier names in GCC
Date: Tue, 06 Aug 2019 17:41:00 -0000
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--- Comment #28 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Mon, 22 Jul 2019, lhyatt at gmail dot com wrote:
> I am interested in helping out with this if there is still interest to support
> this feature. (Full disclosure, I don't have any experience with the gcc
> codebase, but I do have a lot of experience developing with gcc.)
Thanks for working on this! I encourage sending this to gcc-patches once
a few fixes have been made and you've done the legal paperwork, see
<https://gcc.gnu.org/contribute.html>.
I'm wary of the MIN use in _cpp_lex_direct, as this is
performance-critical code so it's not clear an extra operation should be
added for every token. I'd rather put the check for UTF-8 in the default
case (a case that should in practice be rare), with a goto from there to
the case of identifiers.
As a coding style matter, note that in various places sentences in
comments should start with a capital letter.
> 5. There is a problem with diagnostics output when the source contains UTF-8
> characters. The locator caret ends up in the wrong place, I assume just because
> this code is not aware of the multibyte encoding. That much is not specific to
> my patch, it exists already now e.g. with:
This seems like it should have a separate bug filed for it (I don't see
any currently open bugs for this issue).
> The bigger problem though is in layout::print_source_line() which colorizes the
> source lines. It seems to end up attempting to colorize just the first byte,
> even for UTF-8, which makes the output no longer valid. I tried to look into it
> but I wasn't sure what are the implications, e.g. would it require some much
> larger overhaul of diagnostics infrastructure anyway to get this right, and
> would it perhaps be better just to disable colorization in the presence of
> UTF-8 input or something like this, for the meantime.
And this should probably also have a separate bug filed (whether or not it
can occur without this patch applied).
> This is also not specific to this patch and occurs the same if UCN
> is used:
This also seems like a matter for filing a separate bug. Or maybe two
separate bugs, one for C and one for C++, since the fixes might be
different. For C, the suggestion of \xcf\x80 looks like a missing call to
identifier_to_locale when printing an identifier using %qs - but the C++
code is using %qE, which should use identifier_to_locale automatically, so
I'm not sure what's wrong there.
> 7. What is the expected output from gcc -E of this code?
>
> -------
> int π;
> --------
>
> Currently it outputs:
> int \U000003c0;
>
> So curiously, it's as if C++ required translation of extended chars to UCNs is
> happening, so I think this output is actually potentially correct in C++ mode?
> But it is also this way in C mode which I think is probably not expected. It
> seems to come from cpp_output_token() which does not make use of the "original
> spelling" data structures. I am not sure about this one but probably the right
> solution is not much work, if someone knows what that might be?
I don't think the -E output matters much here; it's not specified by the
standard.
The results of stringizing *are* more precisely defined (the relevant
tests stringize twice to verify those results). Strictly, for C++
stringizing twice (for extended characters including $ @ `) should make
the conversion of such characters to UCNs visible (in strings, not just in
identifiers), because, unlike C, C++ does not have the special rule making
it implementation-defined whether the \ of a UCN in a string literal is
doubled when stringizing. I don't think that's something you need to fix,
however, since there's no attempt to implement that conversion for C++ at
present, but it does make a couple of the C++ tests in your patch strictly
invalid.
> This is also the reason that one of the new testcases
> (gcc/testsuite/gcc.dg/cpp/ucnid-13-utf8.c) fails, this:
>
> #define à 1
>
> also preprocesses (in -E -dD) to include UCNs. I am not sure what is expected
> here.
There is definitely no need to preserve spelling there (it's not even
possible in general, since the same macro name can be spelt differently in
otherwise identical definitions of the same macro; it's only a constraint
violation if either macro argument names or the RHS are different, not if
the name of the macro itself is spelt differently). So the right thing is
to test that the output in that case uses a UCN.
> 8. There are tests (e.g. gcc/testsuite/gcc.dg/ucnid-10.c) which verify that
> when the locale is not utf8, diagnostics use UCNs instead of raw UTF8. I am not
> sure if this still makes sense when the files themselves contain UTF8, but that
> was the behavior that came out so I maintained these tests as well.
Yes, I think that's correct.
>From gcc-bugs-return-650457-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 18:00:40 2019
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From: "roland at rschulz dot eu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/91371] std::bind and bind_front don't work with function with call convention
Date: Tue, 06 Aug 2019 18:00:00 -0000
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--- Comment #2 from Roland Schulz <roland at rschulz dot eu> ---
Would you recommend to fix this by adding the specializations for the
alternative calling conventions to std::is_function or by switching to the
libc++ approach?
>From gcc-bugs-return-650458-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 18:11:35 2019
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From: "mateuszb at poczta dot onet.pl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/91352] [10 Regression] Jobserver detection uses fcntl, which is not available on mingw-w64
Date: Tue, 06 Aug 2019 18:11:00 -0000
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mateuszb at poczta dot onet.pl changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mateuszb at poczta dot onet.pl
--- Comment #3 from mateuszb at poczta dot onet.pl ---
Now the error is:
/home/ma/m/cross/bin/i686-w64-mingw32-g++ -fno-PIE -c -pipe -O2 -DIN_GCC
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing
-Wwrite-strings -Wcast-qual -Wno-error=format-diag -Wmissing-format-attribute
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -fno-common -DHAVE_CONFIG_H -I. -I.
-I/home/ma/m/source/gcc-10/gcc -I/home/ma/m/source/gcc-10/gcc/.
-I/home/ma/m/source/gcc-10/gcc/../include
-I/home/ma/m/source/gcc-10/gcc/../libcpp/include
-I/home/ma/m/build/for_target/include -I/home/ma/m/build/for_target/include
-I/home/ma/m/build/for_target/include
-I/home/ma/m/source/gcc-10/gcc/../libdecnumber
-I/home/ma/m/source/gcc-10/gcc/../libdecnumber/bid -I../libdecnumber
-I/home/ma/m/source/gcc-10/gcc/../libbacktrace
-I/home/ma/m/build/for_target/include -o lto-wrapper.o -MT lto-wrapper.o -MMD
-MP -MF ./.deps/lto-wrapper.TPo /home/ma/m/source/gcc-10/gcc/lto-wrapper.c
/home/ma/m/source/gcc-10/gcc/lto-wrapper.c: In function 'bool fd_exists(int)':
/home/ma/m/source/gcc-10/gcc/lto-wrapper.c:1228:3: error: 'HANDLE' was not
declared in this scope
1228 | HANDLE h = (HANDLE) _get_osfhandle (fd);
| ^~~~~~
/home/ma/m/source/gcc-10/gcc/lto-wrapper.c:1229:10: error: 'h' was not declared
in this scope
1229 | return h != (HANDLE) -1;
| ^
/home/ma/m/source/gcc-10/gcc/lto-wrapper.c:1223:16: warning: unused parameter
'fd' [-Wunused-parameter]
1223 | fd_exists (int fd)
| ~~~~^~
Makefile:1118: recipe for target 'lto-wrapper.o' failed
make[2]: *** [lto-wrapper.o] Error 1
>From gcc-bugs-return-650459-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 18:28:06 2019
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
Date: Tue, 06 Aug 2019 18:28:00 -0000
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--- Comment #9 from kargl at gcc dot gnu.org ---
Against my better judgement, I have submitted a patch that seems to fix this
issue.
>From gcc-bugs-return-650460-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 18:43:55 2019
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Subject: [Bug bootstrap/62077] --with-build-config=bootstrap-lto fails
Date: Tue, 06 Aug 2019 18:43:00 -0000
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--- Comment #70 from Eric Gallager <egallager at gcc dot gnu.org> ---
With some distributions wanting to make LTO the default, I'd think this issue
might become a bit more important...
>From gcc-bugs-return-650461-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 19:15:46 2019
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
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--- Comment #10 from Brian T. Carcich <briantcarcich at gmail dot com> ---
thank you.
On Tue, Aug 6, 2019 at 2:28 PM kargl at gcc dot gnu.org <
gcc-bugzilla@gcc.gnu.org> wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91359
>
> --- Comment #9 from kargl at gcc dot gnu.org ---
> Against my better judgement, I have submitted a patch that seems to fix
> this
> issue.
>
> --
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>From gcc-bugs-return-650462-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 19:21:12 2019
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Subject: [Bug libstdc++/91356] Poor optimization of calls involving std::unique_ptr
Date: Tue, 06 Aug 2019 19:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91356
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, when configured with --enable-symvers=gnu-versioned-namespace
But that's just for the library, you'd still need a change to the Itanium ABI.
>From gcc-bugs-return-650463-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 19:23:07 2019
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91380] Requesting a better diagnostic for dumb include mistake
Date: Tue, 06 Aug 2019 19:23:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |diagnostic
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, the fact Clang bothers to warn about it suggests this is a mistake that's
been made at least once before.
>From gcc-bugs-return-650464-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 19:26:42 2019
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/91371] std::bind and bind_front don't work with function with call convention
Date: Tue, 06 Aug 2019 19:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91371
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
We already have 24 partial specializations. To handle ms_abi, fastcall and
thiscall would need another 72. We could probably stamp them out with
preprocessor macros, but I'd prefer not to. I think we need something smarter
(either an __is_function(T) compiler builtin or something like libc++'s
solution).
>From gcc-bugs-return-650465-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 19:46:51 2019
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/91356] Poor optimization of calls involving std::unique_ptr
Date: Tue, 06 Aug 2019 19:46:00 -0000
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--- Comment #9 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #8)
> you'd still need a change to the Itanium ABI.
Or an attribute like [[clang::trivial_abi]], or the one that p1029 is trying to
standardize. But since we would need all compilers to support the attribute, I
guess that it would indeed count as a change to the Itanium ABI.
>From gcc-bugs-return-650466-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 19:47:05 2019
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Subject: [Bug fortran/42546] ALLOCATED statement typo in the docs and for scalar variables
Date: Tue, 06 Aug 2019 19:47:00 -0000
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--- Comment #6 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Tue Aug 6 19:46:29 2019
New Revision: 274147
URL: https://gcc.gnu.org/viewcvs?rev=274147&root=gcc&view=rev
Log:
2019-08-01 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/42546
* check.c(gfc_check_allocated): Add comment pointing to ...
* intrinsic.c(sort_actual): ... the checking done here.
2019-08-01 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/42546
* gfortran.dg/allocated_1.f90: New test.
* gfortran.dg/allocated_2.f90: Ditto.
Added:
trunk/gcc/testsuite/gfortran.dg/allocated_1.f90
trunk/gcc/testsuite/gfortran.dg/allocated_2.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/check.c
trunk/gcc/fortran/intrinsic.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-650467-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 20:05:15 2019
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Subject: [Bug c++/81429] maybe_unused attribute triggers syntax error when used on first argument to a constructor
Date: Tue, 06 Aug 2019 20:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81429
Hana DusÃková <hanicka at hanicka dot net> changed:
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----------------------------------------------------------------------------
CC| |hanicka at hanicka dot net
--- Comment #3 from Hana DusÃková <hanicka at hanicka dot net> ---
Hi I run into same issue recently with GCC trunk. EDG, clang, MSVC accept such
code.
>From gcc-bugs-return-650468-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 20:18:59 2019
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Subject: [Bug c++/81429] maybe_unused attribute triggers syntax error when used on first argument to a constructor
Date: Tue, 06 Aug 2019 20:18:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |mpolacek at gcc dot gnu.org
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I'll take a look.
>From gcc-bugs-return-650469-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 20:21:56 2019
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Subject: [Bug c++/81429] maybe_unused attribute triggers syntax error when used on first argument to a constructor
Date: Tue, 06 Aug 2019 20:21:00 -0000
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--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Small test from Hana:
void foo([[maybe_unused]] int a) { }
struct bar {
bar([[maybe_unused]] int a) { }
};
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Subject: [Bug fortran/84591] Compiling gfortran.dg/bind_c_usage_10.f03 with -fdefault-integer-8 gives errors
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |kargl at gcc dot gnu.org
--- Comment #2 from kargl at gcc dot gnu.org ---
(In reply to Dominique d'Humieres from comment #0)
> Compiling gfortran.dg/bind_c_usage_10.f03 with -fdefault-integer-8 gives
> errors:
>
> /opt/gcc/_clean/gcc/testsuite/gfortran.dg/bind_c_usage_10.f03:66:31:
>
> integer(c_int) function func4()
> 1
> Error: FUNCTION result func4 can't be of type INTEGER(4) in FUNCTION func4
> at (1)
> /opt/gcc/_clean/gcc/testsuite/gfortran.dg/bind_c_usage_10.f03:59:31:
>
> integer(c_int) function func3() bind(c, name="myFunc3")
> 1
> Error: FUNCTION result func3 can't be of type INTEGER(4) in FUNCTION func3
> at (1)
> /opt/gcc/_clean/gcc/testsuite/gfortran.dg/bind_c_usage_10.f03:52:31:
>
> integer(c_int) function func2()
> 1
> Error: FUNCTION result func2 can't be of type INTEGER(4) in FUNCTION func2
> at (1)
> /opt/gcc/_clean/gcc/testsuite/gfortran.dg/bind_c_usage_10.f03:45:31:
>
> integer(c_int) function func1() bind(c, name="myFunc1")
> 1
> Error: FUNCTION result func1 can't be of type INTEGER(4) in FUNCTION func1
> at (1)
>
> (1) I don't understand why there are these errors.
iso-c-binding.def, lines 50-56,
/* The arguments to NAMED_*CST are:
-- an internal name
-- the symbol name in the module, as seen by Fortran code
-- the value it has, for use in trans-types.c
-- the standard that supports this type */
NAMED_INTCST (ISOCBINDING_INT, "c_int", gfc_c_int_kind, GFC_STD_F2003)
trans-types.c lines 687-688
/* Pick a kind the same size as the C "int" type. */
gfc_c_int_kind = INT_TYPE_SIZE / 8;
That is, gfc_c_int_kind is associated with C's int. It is not
associated with gfc_default_integer_kind.
> (2) I didn't find a way to silence them.
You can silence them by removing the -fdefault-integer-8 option.
>From gcc-bugs-return-650471-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 20:42:50 2019
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Subject: [Bug libstdc++/91371] std::bind and bind_front don't work with function with call convention
Date: Tue, 06 Aug 2019 20:42:00 -0000
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--- Comment #4 from Roland Schulz <roland at rschulz dot eu> ---
Are there any known issues with the libc++ solution? Otherwise it seems like
the simpler solution than adding a builtin.
>From gcc-bugs-return-650472-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 20:55:45 2019
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Subject: [Bug tree-optimization/91227] pointer relational expression not folded but equivalent inequality is
Date: Tue, 06 Aug 2019 20:55:00 -0000
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--- Comment #16 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I think the most likely case for code using such comparisons is not a
mistake, but code doing something like memmove - code that checks whether
two arrays overlap, and which one comes first if they do overlap, in order
to decide how to carry out some operation on those arrays that may modify
them in-place.
>From gcc-bugs-return-650473-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 21:32:46 2019
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
Date: Tue, 06 Aug 2019 21:32:00 -0000
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--- Comment #11 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Tue Aug 6 21:32:09 2019
New Revision: 274149
URL: https://gcc.gnu.org/viewcvs?rev=274149&root=gcc&view=rev
Log:
2019-08-06 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/91359
* trans-decl.c (gfc_generate_return): Ensure something is returned
from a function.
2019-08-06 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/91359
* gfortran.dg/pr91359_1.f: New test.
* gfortran.dg/pr91359_2.f: Ditto.
Added:
trunk/gcc/testsuite/gfortran.dg/pr91359_1.f
trunk/gcc/testsuite/gfortran.dg/pr91359_2.f
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/trans-decl.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-650474-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 21:45:48 2019
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Subject: [Bug c/67224] UTF-8 support for identifier names in GCC
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--- Comment #29 from Lewis Hyatt <lhyatt at gmail dot com> ---
(In reply to joseph@codesourcery.com from comment #28)
> Thanks for working on this! I encourage sending this to gcc-patches once
> a few fixes have been made and you've done the legal paperwork, see
> <https://gcc.gnu.org/contribute.html>.
>
Thank you very much for taking a look and for the feedback. I will incorporate
all this and send to gcc-patches. Regarding the copyright assignment, I
couldn't quite discern from this link what I need to do next... it seems like I
need someone to email me the necessary form, is that correct?
I will also file additional bug reports for the diagnostics-related stuff; I
believe I can construct test cases that do not depend on this patch for those.
>From gcc-bugs-return-650475-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 06 22:34:00 2019
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Subject: [Bug fortran/47191] Misleading error message if part-ref starts with DATA
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P5 |P4
CC| |kargl at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |kargl at gcc dot gnu.org
Target Milestone|--- |10.0
Severity|enhancement |normal
--- Comment #3 from kargl at gcc dot gnu.org ---
Fixed on trunk by r274033 and r274122.
>From gcc-bugs-return-650476-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 00:00:42 2019
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Subject: [Bug c++/91334] [10 Regression] ICE in propagate_necessity at gcc/tree-ssa-dce.c:813 since r273791
Date: Wed, 07 Aug 2019 00:00:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
r274135 gave:
./PlatformDefinitions.hpp:66:35: internal compiler error: Segmentation fault
66 | #define XALAN_CPP_NAMESPACE_END }
| ^
0xfbc09f crash_signal
../../src-trunk/gcc/toplev.c:326
0xb26383 lookup_page_table_entry
../../src-trunk/gcc/ggc-page.c:632
0xb26383 ggc_set_mark(void const*)
../../src-trunk/gcc/ggc-page.c:1531
0xd69c41 gt_ggc_mx_symtab_node(void*)
/export/gnu/import/git/gcc-test-spec-lto/bld/gcc/gtype-desc.c:1302
0xee468d gt_ggc_ma_order
./gt-passes.h:31
0xee468d gt_ggc_ma_order
./gt-passes.h:26
0xcf6115 ggc_mark_root_tab
../../src-trunk/gcc/ggc-common.c:77
0xcf631c ggc_mark_roots()
../../src-trunk/gcc/ggc-common.c:94
0xb26d05 ggc_collect()
../../src-trunk/gcc/ggc-page.c:2201
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-650477-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 02:19:58 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/81429] maybe_unused attribute triggers syntax error when used on first argument to a constructor
Date: Wed, 07 Aug 2019 02:19:00 -0000
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--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I have a fix. Extended testcase:
void fn1([[maybe_unused]] int a) { }
void fn2(int a [[maybe_unused]]) { }
void fn3(__attribute__((unused)) int a) { }
void fn4(int a __attribute__((unused))) { }
struct S1 {
S1([[maybe_unused]] int a) { }
};
struct S2 {
S2(int f, [[maybe_unused]] int a) { }
};
struct S3 {
S3(int a [[maybe_unused]]) { }
};
struct S4 {
S4(int f, int a [[maybe_unused]]) { }
};
struct S5 {
S5(__attribute__((unused)) int a) { }
};
struct S6 {
S6(int f, __attribute__((unused)) int a) { }
};
struct S7 {
S7(int a __attribute__((unused))) { }
};
struct S8 {
S8(int f, int a __attribute__((unused))) { }
};
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Subject: [Bug c++/91382] New: Missing pedwarn when using [[maybe_unused]] in C++14
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91382
Bug ID: 91382
Summary: Missing pedwarn when using [[maybe_unused]] in C++14
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mpolacek at gcc dot gnu.org
Target Milestone: ---
void foo([[maybe_unused]] int i) { }
$ ./cc1plus -quiet q.C -std=c++14 -pedantic -Wall -W
# nothing
But maybe_unused came in C++17, so we ought to pedwarn in <C++17 modes. Other
attributes most likely have the same issue.
>From gcc-bugs-return-650479-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 03:29:07 2019
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Subject: [Bug c++/81429] maybe_unused attribute triggers syntax error when used on first argument to a constructor
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |patch
--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00426.html
>From gcc-bugs-return-650480-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 05:05:59 2019
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Subject: [Bug c++/91383] New: C++17 should remove some library feature deprecated in C++14
Date: Wed, 07 Aug 2019 05:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91383
Bug ID: 91383
Summary: C++17 should remove some library feature deprecated in
C++14
Product: gcc
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Created attachment 46679
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46679&action=edit
program showing that removed features still compile with c++17 and g++ 9.1.0
auto_ptr, unary_function, binary_function, random_shuffle, ptr_fun, mem_fun,
mem_fun_ref, bind1st and bind2nd have been removed from C++17 but they still
compile with g++ 9.1.0.
Appendix C.4.12 of the draft C++17 standard entitled "Annex D: compatibility
features" says:
"Change: The class templates auto_ptr, unary_function, and binary_function, the
function templates
random_shuffle, and the function templates (and their return types) ptr_fun,
mem_fun, mem_fun_ref,
bind1st, and bind2nd are not defined.
Rationale: Superseded by new features.
Effect on original feature: Valid C ++ 2014 code that uses these class
templates and function templates
may fail to compile in this International Standard."
However
g++-9.1.0 -Wall -Wextra -std=c++17 removed.cpp
normally compiles the attached program with the following warnings:
removed.cpp: In function 'int main()':
removed.cpp:13:10: warning: 'template<class> class std::auto_ptr' is deprecated
[-Wdeprecated-declarations]
13 | std::auto_ptr<int> p{new int};
| ^~~~~~~~
In file included from /softs/gcc-9.1.0/include/c++/9.1.0/memory:80,
from removed.cpp:5:
/softs/gcc-9.1.0/include/c++/9.1.0/bits/unique_ptr.h:53:28: note: declared here
53 | template<typename> class auto_ptr;
| ^~~~~~~~
removed.cpp:35:24: warning: comparison of integer expressions of different
signedness: 'int' and 'std::array<int, 5>::size_type' {aka 'long unsigned int'}
[-Wsign-compare]
35 | for (auto i = 0; i < v.size(); ++i) {
| ~~^~~~~~~~~~
and following output:
* auto_ptr
12
* unary_function
1
* binary_function
0
* random_shuffle
4:3:1:2:0
* ptr_fun
42
* mem_fun
3
* mem_fun_ref
4
* bind1st
12
* bind2nd
12
>From gcc-bugs-return-650481-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 05:13:43 2019
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Subject: [Bug translation/79618] prevent missing space in multiline string literals
Date: Wed, 07 Aug 2019 05:13:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Roland Illig from comment #7)
> Created attachment 46269 [details]
> linter for string literals
>
> The attached linter detects:
>
> * multiline string literals that have the space at the start of the line
> instead of the end of the line.
>
> (In the whole GCC source there are 800 instances of "prev" " curr" and 5500
> instances of "prev " "curr". Therefore there's a clear preference towards
> having the space always at the end.)
>
> * multiline string literals in which neither has a space at the boundary
>
> * multiline string literals in which both have a space at the boundary
>
> These checks are not 100% perfect, they need manual inspection. But at least
> they show where the possible bugs are.
Martin, does -Wformat-diag detect all of these, too?
>From gcc-bugs-return-650482-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 06:01:07 2019
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Agner Fog <agner at agner dot org> changed:
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----------------------------------------------------------------------------
CC| |agner at agner dot org
--- Comment #2 from Agner Fog <agner at agner dot org> ---
Clang does this. Gcc should do the same:
_Z3fooDv16_f: # @_Z3fooDv16_f
.cfi_startproc
# %bb.0:
vaddps .LCPI1_0(%rip){1to16}, %zmm0, %zmm0
retq
>From gcc-bugs-return-650483-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 06:39:21 2019
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91383] C++17 should remove some library feature deprecated in C++14
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--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
> "may fail to compile"
we don't have to remove them, keeping them is actually on purpose so it is
easier for users to have access to new features without breaking the old ones.
What we could do is use the deprecated attribute a bit more (you can use
-Werror=deprecated-declarations), or possibly have some non-default flag to
disable deprecated code.
>From gcc-bugs-return-650484-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 06:42:50 2019
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Subject: [Bug c++/91383] C++17 should remove some library feature deprecated in C++14
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--- Comment #2 from Frédéric Bron <ufospoke at gmail dot com> ---
I agree that in C++14, they should be marked deprecated.
But the features have been removed in C++17. They are not deprecated anymore,
so in my opinion, they should not be available with -std=c++17.
>From gcc-bugs-return-650485-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 06:47:50 2019
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Subject: [Bug c++/91210] Segmentation fault in random.tcc when compiling GCC 9.1 on linux powerpc(ppc) 64
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Martin Marko <m.marko08154711 at gmail dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Martin Marko <m.marko08154711 at gmail dot com> ---
It turned out that the binutils were outdated, using v2.32 solved the problem.
Thx to all involved.
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CC| |agner at agner dot org
--- Comment #1 from Agner Fog <agner at agner dot org> ---
I can confirm that both Clang, MS, and Intel compilers transfer vectors in
registers for function parameters and function return in 64 bit Windows when
__vectorcall is specified. There is still 32 or 40 bytes of superfluous shadow
space allocated on the stack.
Clang adds @@<size> to the mangled function name.
Please support __vectorcall in Gcc as well.
>From gcc-bugs-return-650487-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 07:32:52 2019
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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/91384] New: Compare with negation is not eliminated
Date: Wed, 07 Aug 2019 07:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91384
Bug ID: 91384
Summary: Compare with negation is not eliminated
Product: gcc
Version: 9.0
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Priority: P3
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Following testcase:
--cut here--
void foo (void);
void bar (void);
int
test (int a)
{
int r;
if (r = -a)
foo ();
else
bar ();
return r;
}
--cut here--
results in (-O2):
movl %edi, %r12d
negl %r12d
testl %edi, %edi
je .L2
The combine pass can't do anything, since it sees:
(insn 6 3 7 2 (parallel [
(set (reg/v:SI 82 [ <retval> ])
(neg:SI (reg/v:SI 83 [ a ])))
(clobber (reg:CC 17 flags))
]) "neg.c":9:9 464 {*negsi2_1}
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil)))
(insn 7 6 8 2 (set (reg:CCZ 17 flags)
(compare:CCZ (reg/v:SI 83 [ a ])
(const_int 0 [0]))) "neg.c":9:6 7 {*cmpsi_ccno_1}
(expr_list:REG_DEAD (reg/v:SI 83 [ a ])
(nil)))
Please note that the compare is with the original value (reg: 83), not with the
result of the negation (reg: 82). Tree optimizers give us:
r_3 = -a_2(D);
if (a_2(D) != 0)
goto <bb 3>; [50.00%]
else
goto <bb 4>; [50.00%]
This is a regression from 4.1.2, where the compiler is able to eliminate the
compare:
movl %esi, %ebx
negl %ebx
je .L2
>From gcc-bugs-return-650488-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 07:34:53 2019
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Subject: [Bug fortran/53796] I/O INQUIRE of RECL: If not specified in OPEN, the default value should be returned (sequential access)
Date: Wed, 07 Aug 2019 07:34:00 -0000
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--- Comment #23 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Author: jb
Date: Wed Aug 7 07:34:10 2019
New Revision: 274160
URL: https://gcc.gnu.org/viewcvs?rev=274160&root=gcc&view=rev
Log:
PR 53796 Make inquire(file=, recl=) conform to F2018
In my original patch to fix PR 53796 I forgot to fix the behavior for
unconnected units when inquiring via filename. This patch fixes that.
Regtested on x86_64-pc-linux-gnu, committed as obvious.
libgfortran/ChangeLog:
2019-08-07 Janne Blomqvist <jb@gcc.gnu.org>
PR fortran/53796
* io/inquire.c (inquire_via_filename): Set recl to -1 for
unconnected units.
gcc/testsuite/ChangeLog:
2019-08-07 Janne Blomqvist <jb@gcc.gnu.org>
PR fortran/53796
* gfortran.dg/inquire_recl_f2018.f90: Test for unconnected unit
with inquire via filename.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/inquire_recl_f2018.f90
trunk/libgfortran/ChangeLog
trunk/libgfortran/io/inquire.c
>From gcc-bugs-return-650489-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 07:40:26 2019
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Subject: [Bug middle-end/91358] Wrong code with dynamic allocation and optional like class
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|wrong-code |
Status|UNCONFIRMED |RESOLVED
Resolution|--- |WONTFIX
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Indeed "speculating" [uninitialized] loads is something GCC frequently does if
it
knowns those loads do not trap. I guess valgrind could be improved to check
only at uses of the uninit value?
>From gcc-bugs-return-650490-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 07:49:21 2019
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Subject: [Bug ipa/91374] [Missed optimization] Versioning opportunities to improve performance
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Version|tree-ssa |10.0
Keywords| |missed-optimization
Last reconfirmed| |2019-08-07
Component|tree-optimization |ipa
CC| |jamborm at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
So you ask for main to be converted to
if (idx == 0)
foo_32_16 ();
else /* idx == 1 */
foo_16_8 ();
correct? It shoulds like an interesting idea for an IPA-CP cloning
opportunity. But I wonder how much real-world testcases exists
that are not benchmarks ;) One could tell by implementing the
analysis into the param analysis stage (look for defs that are
loads from a constant initialized entity, possibly multiple of them
and (some of them) reusing the same memory index). A related thing
would be to value-profile the indexes since when the array doesn't
only contain two values it isn't feasible to clone for all possible
values.
>From gcc-bugs-return-650491-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 07:50:10 2019
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Subject: [Bug lto/91375] [8/9/10 Regression] ICE on valid code in subbinfo_with_vtable_at_offset at ipa-devirt.c:2760 since r256685
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |hubicka at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will have a look.
>From gcc-bugs-return-650492-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 07:51:20 2019
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
Date: Wed, 07 Aug 2019 07:51:00 -0000
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Possibly related to the .gnu_lto emission changes?
>From gcc-bugs-return-650493-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 07:53:23 2019
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Subject: [Bug c++/91334] [10 Regression] ICE in propagate_necessity at gcc/tree-ssa-dce.c:813 since r273791
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|REOPENED |WAITING
--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Can you please provide both compiler options used and a test-case?
>From gcc-bugs-return-650494-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 07:55:59 2019
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> Possibly related to the .gnu_lto emission changes?
Well, my changes are not part of any binutils release yet.
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91377] [8/9/10 Regression] ICE with non-static block scope constexpr, captured in lambda, used as template parameter
Date: Wed, 07 Aug 2019 07:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91377
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |7.3.0
Keywords| |ice-on-valid-code,
| |needs-reduction
Last reconfirmed| |2019-08-07
Ever confirmed|0 |1
Summary|(regression) ICE with |[8/9/10 Regression] ICE
|non-static block scope |with non-static block scope
|constexpr, captured in |constexpr, captured in
|lambda, used as template |lambda, used as template
|parameter |parameter
Target Milestone|--- |8.4
Known to fail| |9.1.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed with GCC 9 branch head. GCC 7 doesn't like the preprocessed source
though.
>From gcc-bugs-return-650497-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 07:58:50 2019
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Subject: [Bug libstdc++/91260] std::unary_function and std::binary_function still exist in C++17
Date: Wed, 07 Aug 2019 07:58:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |ufospoke at gmail dot com
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 91383 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-650496-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 07:58:50 2019
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Subject: [Bug c++/91383] C++17 should remove some library feature deprecated in C++14
Date: Wed, 07 Aug 2019 07:58:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
See Bug 91260 comment 1.
This is not a bug. Continuing to provide those features is conforming.
If you don't want to use them in C++17, don't use them.
If you want your code to fail to compile, there are other ways to make your
code ill-formed.
*** This bug has been marked as a duplicate of bug 91260 ***
>From gcc-bugs-return-650498-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 07:58:51 2019
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Subject: [Bug c++/91378] [9 regression] [C++17] ICE in type_dependent_expression_p with noexcept and deduced return type
Date: Wed, 07 Aug 2019 07:58:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Known to work| |10.0
Target Milestone|--- |9.2
>From gcc-bugs-return-650499-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:01:45 2019
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Subject: [Bug c++/91383] C++17 should remove some library feature deprecated in C++14
Date: Wed, 07 Aug 2019 08:01:00 -0000
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Specifically, note that Annex D says code MAY fail to compile. It is not
required to fail to compile.
Some users want the features to remain, and it hurts them if the features are
removed. It hurts nobody if they stay ("I want my code to be invalid!" is not a
use case I care about, as I said, there are plenty of other ways to make your
code ill-formed if that's what you desire).
>From gcc-bugs-return-650500-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:03:20 2019
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Subject: [Bug tree-optimization/91384] [7/8/9/10 Regression] Compare with negation is not eliminated
Date: Wed, 07 Aug 2019 08:03:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |7.5
Summary|Compare with negation is |[7/8/9/10 Regression]
|not eliminated |Compare with negation is
| |not eliminated
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r223689. Though, generally that change looks like a useful GIMPLE
canonicalization.
Can't this be done in a peephole2?
>From gcc-bugs-return-650501-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:13:25 2019
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Subject: [Bug tree-optimization/91384] [7/8/9/10 Regression] Compare with negation is not eliminated
Date: Wed, 07 Aug 2019 08:13:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmpf. So the following was not optimized ever:
void foo (void);
void bar (void);
int
test (int a)
{
int r = -a;
if (a == 0)
foo ();
else
bar ();
return r;
}
Note this is also about canonicalization if you consider both jump forms
appearing in the source and the ability to thread them.
But yes, the CC re-using form is better (in case r is not dead otherwise).
On GIMPLE this shows we lack modeling of CCs. I'm not sure doing
_1 = __IFN_NEGATE_WITH_CCZ (a_2);
r_3 = __real _1;
_4 = __imag _1;
if (_4 != 0)
foo ();
else
bar ();
is the way to go though (that would be possible with current infrastructure).
A "nicer"/leaner way would be to generalize SSA projections so we do not
have to abuse COMPLEX and could allow
_1 = __IFN_NEGATE_WITH_CC (a_2);
r_3 = __value _1;
if (__CCZ _1 != 0);
foo ();
else
bar ();
but then doing this on GIMPLE is of course prone to CC spilling.
Note "fixing" the above testcase on GIMPLE is as hard as fixing it on RTL.
>From gcc-bugs-return-650503-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:17:38 2019
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Subject: [Bug c++/91382] Missing pedwarn when using [[maybe_unused]] in C++14
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Are you sure? Aren't unknown attributes supposed to be ignored?
"For an attribute-token (including an attribute-scoped-token) not specified in
this document, the behavior is implementation-defined. Any attribute-token that
is not recognized by the implementation is ignored. [Note:
Each implementation should choose a distinctive name for the
attribute-namespace in an attribute-scoped-token. — end note]"
E.g. maybe_unused attribute is not specified in C++11 or C++14 documents, so
they have implementation-defined behavior if our implementation recognizes it,
or ignored if it doesn't, not ill-formed.
>From gcc-bugs-return-650502-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:17:23 2019
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Subject: [Bug middle-end/91358] Wrong code with dynamic allocation and optional like class
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--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #4)
> I guess valgrind could be improved to check
> only at uses of the uninit value?
It is used. In the easy case it would be used in "undef & 0", so the result
does not depend on undef. It may get a bit complicated for valgrind to
recognize all operations that do not depend on one of the operands, but a
subset would be doable. However, here we transform:
if (x) if (y) ...
to
if (x & y)
and expand to
if (y) if (x) ...
where y may be undefined when !x. After a few jumps we end up in the same
place, but that seems impossible for valgrind to handle.
>From gcc-bugs-return-650504-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:22:12 2019
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Subject: [Bug libstdc++/91383] C++17 should remove some library feature deprecated in C++14
Date: Wed, 07 Aug 2019 08:22:00 -0000
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--- Comment #5 from Frédéric Bron <ufospoke at gmail dot com> ---
OK, thanks. I agree it dos not real harm.
>From gcc-bugs-return-650505-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:28:21 2019
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
Date: Wed, 07 Aug 2019 08:28:00 -0000
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--- Comment #3 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
> (In reply to Richard Biener from comment #1)
>> Possibly related to the .gnu_lto emission changes?
>
> Well, my changes are not part of any binutils release yet.
But I *have* been using binutils trunk for this build, as mentioned both
in the title and the report. Only then does the error occur, the 2.32
release is fine.
>From gcc-bugs-return-650506-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:30:46 2019
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Subject: [Bug c++/91382] Missing pedwarn when using [[maybe_unused]] in C++14
Date: Wed, 07 Aug 2019 08:30:00 -0000
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--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #1)
> Aren't unknown attributes supposed to be ignored?
Bug 86368 is related to that point.
>From gcc-bugs-return-650507-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:31:57 2019
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
Date: Wed, 07 Aug 2019 08:31:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2019-08-07
Ever confirmed|0 |1
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #3)
> > --- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
> > (In reply to Richard Biener from comment #1)
> >> Possibly related to the .gnu_lto emission changes?
> >
> > Well, my changes are not part of any binutils release yet.
>
> But I *have* been using binutils trunk for this build, as mentioned both
> in the title and the report. Only then does the error occur, the 2.32
> release is fine.
Sorry for not getting that. Well, then please try revision before
cc5277b173701364c10204f316db28198f2c683b
>From gcc-bugs-return-650508-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:32:47 2019
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Subject: [Bug c++/91382] Missing pedwarn when using [[maybe_unused]] in C++14
Date: Wed, 07 Aug 2019 08:32:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, this seems like a case that should be ignored. We have
-Wunknown-attributes that *doesn't* ignore them, but the main use of that is to
catch typos in the attribute name, or warn about unsupported attributes (in
case the code relies on it working). In this case it's a supported attribute
that is spelled correctly, so silently accepting it seems fine.
In the particular case of maybe_unused its purpose is to suppress diagnostics,
so potentially giving extra diagnostics has the opposite effect! And if the
concern is portability to older pre-C++17 compilers, the worst case scenario if
this attribute is not recognized is an unused variable warning.
>From gcc-bugs-return-650509-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:35:11 2019
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Subject: [Bug tree-optimization/91384] [7/8/9/10 Regression] Compare with negation is not eliminated
Date: Wed, 07 Aug 2019 08:35:00 -0000
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--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #1)
> Started with r223689. Though, generally that change looks like a useful
> GIMPLE canonicalization.
FYI, -fno-tree-forwprop generates expected code.
> Can't this be done in a peephole2?
Sure, but this looks like a more generic missed optimization problem, where
solution would benefit several targets.
>From gcc-bugs-return-650510-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:48:52 2019
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Subject: [Bug c++/91377] [8/9/10 Regression] ICE with non-static block scope constexpr, captured in lambda, used as template parameter
Date: Wed, 07 Aug 2019 08:48:00 -0000
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--- Comment #2 from Jeffrey Kelling <gcc.j.kelling at hzdr dot de> ---
Created attachment 46680
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46680&action=edit
gcc 7.3.0 preprocessed source
Not sure if it helps, but here is the code preprocessed by gcc 7.3.0.
This compiles with gcc 7.3.0.
gcc 9.1.0 does not like this one:
./thirdParty/alpaka/include/alpaka/vec/Vec.hpp: In instantiation of ‘decltype
(createVecFromIndexedFnArbitrary<TDim, template<long unsigned int <anonymous> >
class TTFnObj>(alpaka::meta::MakeIntegerSequence<typename TDim::value_type,
TDim::value>(),
(forward<TArgs>)(alpaka::vec::createVecFromIndexedFn::args)...))
alpaka::vec::createVecFromIndexedFn(TArgs&& ...) [with TDim =
std::integral_constant<long unsigned int, 3>; TTFnObj =
alpaka::vec::Vec<std::integral_constant<long unsigned int, 3>, unsigned
int>::CreateSingleVal; TArgs = {const unsigned int&}]’:
include/picongpu/main.cpp:70:1: required from here
./thirdParty/alpaka/include/alpaka/vec/Vec.hpp:99:14: sorry, unimplemented:
mangling implicit_conv_expr
>From gcc-bugs-return-650512-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:50:59 2019
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Subject: [Bug lto/91375] [8/9/10 Regression] ICE on valid code in subbinfo_with_vtable_at_offset at ipa-devirt.c:2760 since r256685
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
TYPE_BINFO (DECL_CONTEXT (vtable)) is NULL. DECL_CONTEXT is BDS_Mesh here,
from the -O0 compile where it is cleared here:
static void
free_lang_data_in_type (tree type, class free_lang_data_d *fld)
{
...
if (TYPE_BINFO (type))
{
free_lang_data_in_binfo (TYPE_BINFO (type));
/* We need to preserve link to bases and virtual table for all
polymorphic types to make devirtualization machinery working. */
if (!BINFO_VTABLE (TYPE_BINFO (type))
|| !flag_devirtualize)
TYPE_BINFO (type) = NULL;
so I guess that flag_devirtualize is to blame since it may differ between
CUs and type merging may chose the instance from a !flag_devirtualize one.
A fix could be as simple as removing the !flag_devirtualize case.
Honza?
>From gcc-bugs-return-650511-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 08:50:45 2019
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
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--- Comment #5 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
[...]
> Sorry for not getting that. Well, then please try revision before
> cc5277b173701364c10204f316db28198f2c683b
That one is fine: the testcase links without error/warning.
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Subject: [Bug ipa/91374] [Missed optimization] Versioning opportunities to improve performance
Date: Wed, 07 Aug 2019 08:53:00 -0000
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--- Comment #2 from Hao Liu <hliu at amperecomputing dot com> ---
(In reply to Richard Biener from comment #1)
> So you ask for main to be converted to
>
> if (idx == 0)
> foo_32_16 ();
> else /* idx == 1 */
> foo_16_8 ();
>
> correct? It shoulds like an interesting idea for an IPA-CP cloning
> opportunity. But I wonder how much real-world testcases exists
> that are not benchmarks ;) One could tell by implementing the
> analysis into the param analysis stage (look for defs that are
> loads from a constant initialized entity, possibly multiple of them
> and (some of them) reusing the same memory index). A related thing
> would be to value-profile the indexes since when the array doesn't
> only contain two values it isn't feasible to clone for all possible
> values.
Proberbly. Actually we can just versioning "width", as "height" may be
independent to "width" (my case misleads by using the same array index) and
"height" doesn't affect performance too much. So the expected result could be:
if (width == 16)
foo_w16 ();
else /* width == 8 */
foo_w8 ();
>From gcc-bugs-return-650514-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 09:02:48 2019
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Good, then let me take a look.
>From gcc-bugs-return-650515-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 09:24:43 2019
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
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--- Comment #12 from Brian T. Carcich <briantcarcich at gmail dot com> ---
Steve,
I ran GCC SVN repo rev 274151 against part of our SFTRAN3-generated codebase,
and they now pass the unit tests.
This work will be used to update the MIRAGE suite of software for
high-precision trajectory determination of active spacecraft missions (New
Horizons, OSIRIS-REx, etc.).
Thank you for your efforts, despite your better judgement. Again, I apologize
for my carelessness in reading what you initially wrote and the arrogance and
stupidity in my response.
Best regards,
Brian T. Carcich
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #6)
> Good, then let me take a look.
So I've just tested current master of binutils and I can see:
marxin@marxinbox:/tmp> gcc --version
gcc (GCC) 10.0.0 20190806 (experimental)
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
marxin@marxinbox:/tmp> gcc -c -flto main.c
$ nm main.o
nm: main.o: plugin needed to handle lto object
0000000000000001 C __gnu_lto_slim
The issue here is that the installed nm can't load plugin from bfd-plugins:
$ strace -f -s512 nm main.o 2>&1 | grep plugin
openat(AT_FDCWD, "/home/marxin/bin/binutils/bin/../bin/../lib/bfd-plugins",
O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 4
stat("/home/marxin/bin/binutils/bin/../bin/../lib/bfd-plugins/..",
{st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat("/home/marxin/bin/binutils/bin/../bin/../lib/bfd-plugins/.",
{st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
write(2, "main.o: plugin needed to handle lto object", 42main.o: plugin needed
to handle lto object) = 42
$ nm --plugin /dev/shm/objdir/lto-plugin/.libs/liblto_plugin.so.0.0.0 main.o
00000000 T main
So the question is if you have a LTO plugin accessible for the built gold or
nm?
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Subject: [Bug lto/91375] [8/9/10 Regression] ICE on valid code in subbinfo_with_vtable_at_offset at ipa-devirt.c:2760 since r256685
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
>
> so I guess that flag_devirtualize is to blame since it may differ between
> CUs and type merging may chose the instance from a !flag_devirtualize one.
> A fix could be as simple as removing the !flag_devirtualize case.
Yes, the removal of '!flag_devirtualize' looks logical to me.
>From gcc-bugs-return-650518-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 09:49:00 2019
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
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--- Comment #13 from Brian T. Carcich <briantcarcich at gmail dot com> ---
Whoops, I meant rev 274149.
>From gcc-bugs-return-650520-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 10:11:56 2019
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Subject: [Bug target/91385] Zero-extended negation (*negsi2_1_zext) is not generated
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Uroš Bizjak <ubizjak at gmail dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
Mine. I have a patch.
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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/91385] New: Zero-extended negation (*negsi2_1_zext) is not generated
Date: Wed, 07 Aug 2019 10:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91385
Bug ID: 91385
Summary: Zero-extended negation (*negsi2_1_zext) is not
generated
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Reporter: ubizjak at gmail dot com
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Following testcase:
unsigned long
foo (int a)
{
return (unsigned) -a;
}
should use *negsi2_1_zext instruction, but compiles (-O2) to:
negl %edi # 6 [c=4 l=2] *negsi2_1
movl %edi, %eax # 7 [c=1 l=2] *zero_extendsidi2/3
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From: "schwab@linux-m68k.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/91386] New: open-iscsi iscsiadm miscompiled by LTO on aarch64
Date: Wed, 07 Aug 2019 10:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91386
Bug ID: 91386
Summary: open-iscsi iscsiadm miscompiled by LTO on aarch64
Product: gcc
Version: 9.1.1
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
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Target: aarch64-*-*
This is the start of main from iscsiadm:
8fe0: d13003ff sub sp, sp, #0xc00
8fe4: a9007bfd stp x29, x30, [sp]
8fe8: 910003fd mov x29, sp
8fec: a9025bf5 stp x21, x22, [sp, #32]
8ff0: 2a0003f6 mov w22, w0
8ff4: f0000420 adrp x0, 8f000
<iscsi_ifaces_get@plt+0x86030>
8ff8: a90153f3 stp x19, x20, [sp, #16]
8ffc: f9479800 ldr x0, [x0, #3888]
9000: a90363f7 stp x23, x24, [sp, #48]
9004: d10983ff sub sp, sp, #0x260
9008: aa0103f7 mov x23, x1
900c: f9400001 ldr x1, [x0]
9010: f9072fe1 str x1, [sp, #3672]
9014: d2800001 mov x1, #0x0 // #0
9018: b90397ff str wzr, [sp, #916]
901c: b9039bff str wzr, [sp, #920]
9020: f901d7ff str xzr, [sp, #936]
9024: f901dbff str xzr, [sp, #944]
9028: 97fffd12 bl 8470 <iscsi_context_new@plt>
902c: f9017fe0 str x0, [sp, #760]
9030: b4007540 cbz x0, 9ed8 <iscsi_ifaces_get@plt+0xf08>
9034: f90153f9 str x25, [sp, #672]
9038: b0000021 adrp x1, e000 <iscsi_ifaces_get@plt+0x5030>
903c: f90157fa str x26, [sp, #680]
9040: 910d0021 add x1, x1, #0x340
9044: f9015bfb str x27, [sp, #688]
9048: 911263e0 add x0, sp, #0x498
904c: f900011c str x28, [x8]
The last insn is part of the prologue to save register x28, but x8 is never
set.
This breaks during peephole2:
(insn/f:TI 7430 7429 7271 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 696 [0x2b8])) [69 S8 A8])
(reg:DI 28 x28)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 28 x28)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 696 [0x2b8])) [69 S8 A8])
(reg:DI 28 x28))
(nil))))
is transformed into:
(insn/f:TI 7430 7429 7842 4 (set (mem/c:DI (reg:DI 8 x8) [69 S8 A8])
(reg:DI 28 x28)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 28 x28)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 696 [0x2b8])) [69 S8 A8])
(reg:DI 28 x28))
(nil))))
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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--- Comment #4 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
R8 is the register used for the address of the return value location when the
result cannot be stored in registers. Are you sure that this isn't a problem
in the caller?
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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--- Comment #5 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
(In reply to Richard Earnshaw from comment #4)
> R8 is the register used for the address of the return value location when
> the result cannot be stored in registers. Are you sure that this isn't a
> problem in the caller?
Scratch that, can't be the case in main.
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Subject: [Bug debug/86675] C++ lambdas are not debugable with -std=c++17 (or above) and -Og
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-07
Ever confirmed|0 |1
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirmed. With -std=gnu++17 the breakpoint on line 3 (the return statement
inside the lambda expression) actually breaks on line 2:
Breakpoint 1, main () at 86675.cc:2
2 return [] {
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Subject: [Bug driver/91130] [9/10 Regression] -MF clashes with -flto on aarch64
Date: Wed, 07 Aug 2019 11:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91130
Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|target |driver
--- Comment #33 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
This is a problem in lto-wrapper, so really a driver bug.
>From gcc-bugs-return-650529-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 11:03:44 2019
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
Date: Wed, 07 Aug 2019 11:03:00 -0000
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
So I can't reproduce with a cross easily (w/o a libc I can only
do a partial link). Nevertheless I see some
58: 910e63e6 add x6, sp, #0x398
...
90: a90008c2 stp x2, x2, [x6]
which is probably what was intended.
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
Date: Wed, 07 Aug 2019 11:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91386
--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
I'm reducing the LTO files that are needed to expose the problem..
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
Date: Wed, 07 Aug 2019 11:06:00 -0000
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
So if one can reproduce a way for a smaller testcase (likely only for trunk
then) is to -fdump-tree-optimized-gimple and make a GIMPLE FE testcase from
main()
(adding relevant typedefs from the preprocessed sources). It may not
necessarily reproduce the issue of course...
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Subject: [Bug debug/86675] C++ lambdas are not debugable with -std=c++17 (or above) and -Og
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
cat >86675.cc <<EOT
int main() {
return [] {
return 000031415;
}();
}
EOT
cat >cmds <<EOT
br main:3
run
step
cont
quit
EOT
g++ 86675.cc -g -Og -std=c++14
gdb -q -x cmds ./a.out 2>/dev/null | grep return
g++ 86675.cc -g -Og -std=c++17
gdb -q -x cmds ./a.out 2>/dev/null | grep return
The first GDB session breaks at:
3 return 000031415;
The second at:
2 return [] {
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Subject: [Bug driver/91130] [9/10 Regression] -MF clashes with -flto on aarch64
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--- Comment #34 from Richard Biener <rguenth at gcc dot gnu.org> ---
So like the following then.
Index: gcc/lto-wrapper.c
===================================================================
--- gcc/lto-wrapper.c (revision 274111)
+++ gcc/lto-wrapper.c (working copy)
@@ -133,7 +133,6 @@ maybe_unlink (const char *file)
static void
get_options_from_collect_gcc_options (const char *collect_gcc,
const char *collect_gcc_options,
- unsigned int lang_mask,
struct cl_decoded_option
**decoded_options,
unsigned int *decoded_options_count)
{
@@ -176,8 +175,7 @@ get_options_from_collect_gcc_options (co
argc = obstack_object_size (&argv_obstack) / sizeof (void *) - 1;
argv = XOBFINISH (&argv_obstack, const char **);
- decode_cmdline_options_to_array (argc, (const char **)argv,
- lang_mask,
+ decode_cmdline_options_to_array (argc, (const char **)argv, CL_DRIVER,
decoded_options, decoded_options_count);
obstack_free (&argv_obstack, NULL);
}
@@ -1009,8 +1007,7 @@ find_and_merge_options (int fd, off_t fi
{
struct cl_decoded_option *f2decoded_options;
unsigned int f2decoded_options_count;
- get_options_from_collect_gcc_options (collect_gcc,
- fopts, CL_LANG_ALL,
+ get_options_from_collect_gcc_options (collect_gcc, fopts,
&f2decoded_options,
&f2decoded_options_count);
if (!fdecoded_options)
@@ -1283,7 +1280,6 @@ run_gcc (unsigned argc, char *argv[])
fatal_error (input_location,
"environment variable %<COLLECT_GCC_OPTIONS%> must be set");
get_options_from_collect_gcc_options (collect_gcc, collect_gcc_options,
- CL_LANG_ALL,
&decoded_options,
&decoded_options_count);
>From gcc-bugs-return-650534-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 11:23:17 2019
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Subject: [Bug c++/91382] Missing pedwarn when using [[maybe_unused]] in C++14
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
True enough. I noticed clang++ warns:
warning: use of the 'maybe_unused' attribute is a C++17 extension
[-Wc++17-extensions]
but this is a dup of Bug 86368 at best. Closing.
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-07
Ever confirmed|0 |1
--- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
I ended up with 5 files that are needed for the issue and my backtrace is then:
│0xaaaaaaab3930 <main> sub sp, sp, #0xbc0
│0xaaaaaaab3934 <main+4> stp x29, x30, [sp]
│0xaaaaaaab3938 <main+8> mov x29, sp
│0xaaaaaaab393c <main+12> stp x19, x20, [sp, #16]
│0xaaaaaaab3940 <main+16> stp x23, x24, [sp, #48]
│0xaaaaaaab3944 <main+20> sub sp, sp, #0x260
│0xaaaaaaab3948 <main+24> add x9, sp, #0x390
│0xaaaaaaab394c <main+28> mov w23, w0
│0xaaaaaaab3950 <main+32> mov w0, #0xffffffff
// #-1
│0xaaaaaaab3954 <main+36> mov x24, x1
│0xaaaaaaab3958 <main+40> str xzr, [sp, #928]
│0xaaaaaaab395c <main+44> stp wzr, w0, [x9, #-8]
│0xaaaaaaab3960 <main+48> stp wzr, w0, [x9]
│0xaaaaaaab3964 <main+52> str xzr, [sp, #936]
│0xaaaaaaab3968 <main+56> bl 0xaaaaaaab2d20
<iscsi_context_new@plt>
│0xaaaaaaab396c <main+60> str x0, [sp, #752]
│0xaaaaaaab3970 <main+64> cbz x0, 0xaaaaaaab46f0
<main+3520>
│0xaaaaaaab3974 <main+68> str x21, [sp, #640]
│0xaaaaaaab3978 <main+72> adrp x1, 0xaaaaaaac4000
<__for_each_matched_rec+48>
│0xaaaaaaab397c <main+76> str x22, [sp, #648]
│0xaaaaaaab3980 <main+80> add x1, x1, #0x6c8
│0xaaaaaaab3984 <main+84> str x25, [sp, #672]
│0xaaaaaaab3988 <main+88> add x0, sp, #0x460
│0xaaaaaaab398c <main+92> str x26, [sp, #680]
│0xaaaaaaab3990 <main+96> add x8, sp, #0x3b8
│0xaaaaaaab3994 <main+100> str x27, [sp, #688]
│0xaaaaaaab3998 <main+104> add x3, sp, #0x3c8
>│0xaaaaaaab399c <main+108> str x28, [x7]
Segfault happens at the last instruction.
>From gcc-bugs-return-650536-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 11:29:39 2019
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Subject: [Bug driver/91130] [9/10 Regression] -MF clashes with -flto on aarch64
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--- Comment #35 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Yeah, plus removing " according to LANG_MASK" from
get_options_from_collect_gcc_options function comment. But Martin claims it
doesn't work.
>From gcc-bugs-return-650537-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 11:31:31 2019
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Subject: [Bug driver/91130] [9/10 Regression] -MF clashes with -flto on aarch64
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--- Comment #36 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #35)
> Yeah, plus removing " according to LANG_MASK" from
> get_options_from_collect_gcc_options function comment. But Martin claims it
> doesn't work.
Yes, I needed both CL_DRIVER | CL_LANG_ALL to have it working.
>From gcc-bugs-return-650538-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 11:39:40 2019
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Subject: [Bug driver/91130] [9/10 Regression] -MF clashes with -flto on aarch64
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--- Comment #37 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #36)
> (In reply to Jakub Jelinek from comment #35)
> > Yeah, plus removing " according to LANG_MASK" from
> > get_options_from_collect_gcc_options function comment. But Martin claims it
> > doesn't work.
>
> Yes, I needed both CL_DRIVER | CL_LANG_ALL to have it working.
I can't reproduce that though, works just fine for me with just CL_DRIVER
(richi's patch), verified it processes the -MF argument properly.
./xgcc -B ./ -c -flto pr91130.c
./xgcc -B ./ -o pr91130{,.o} -flto -MMD -MF deps
that previously failed now works.
>From gcc-bugs-return-650539-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 11:44:35 2019
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Subject: [Bug driver/91130] [9/10 Regression] -MF clashes with -flto on aarch64
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--- Comment #38 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #37)
> (In reply to Martin Liška from comment #36)
> > (In reply to Jakub Jelinek from comment #35)
> > > Yeah, plus removing " according to LANG_MASK" from
> > > get_options_from_collect_gcc_options function comment. But Martin claims it
> > > doesn't work.
> >
> > Yes, I needed both CL_DRIVER | CL_LANG_ALL to have it working.
>
> I can't reproduce that though, works just fine for me with just CL_DRIVER
> (richi's patch), verified it processes the -MF argument properly.
> ./xgcc -B ./ -c -flto pr91130.c
> ./xgcc -B ./ -o pr91130{,.o} -flto -MMD -MF deps
> that previously failed now works.
Ok, I'll give it one more try with Richi's patch.
>From gcc-bugs-return-650540-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 11:54:03 2019
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> ---
I'm attaching all tree and rtl dumps for the problematic LTRANS unit:
https://drive.google.com/file/d/1CW4cWvpm1VVXFIP80XCf1IzYXWwTsynZ/view?usp=sharing
I can confirm what Andreas sees:
(note 8303 8031 7890 4 NOTE_INSN_PROLOGUE_END)
(insn:TI 7890 8303 7889 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 704 [0x2c0])) [63 %sfp+-2912 S8 A64])
(reg/f:DI 2 x2 [1833])) "../include/list.h":29:13 47 {*movdi_aarch64}
(nil))
(insn 7889 7890 7887 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 712 [0x2c8])) [63 %sfp+-2904 S8 A64])
(reg/f:DI 3 x3 [1834])) "../include/list.h":29:13 47 {*movdi_aarch64}
(nil))
gets transformed by peephole2 to:
(note 8303 8031 8556 4 NOTE_INSN_PROLOGUE_END)
(insn 8556 8303 7887 4 (parallel [
(set (mem/c:DI (plus:DI (reg:DI 7 x7)
(const_int 8 [0x8])) [63 %sfp+-2912 S8 A64])
(reg/f:DI 2 x2 [1833]))
(set (mem/c:DI (plus:DI (reg:DI 7 x7)
(const_int 16 [0x10])) [63 %sfp+-2904 S8 A64])
(reg/f:DI 3 x3 [1834]))
]) "../include/list.h":29:13 -1
(nil))
I don't know what's the meaning of x7 register, but it's not set during main
function execution.
>From gcc-bugs-return-650541-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 12:06:57 2019
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Subject: [Bug middle-end/90796] [8/9/10 Regression] GCC: O2 vs O3 output differs on simple test
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--- Comment #11 from Michael Matz <matz at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #10)
> >It's the only affine functions that don't progress with each iteration.
> > I
> >think, at least :)
>
> Hm. At least we analyze wrapping ones, but I guess 0, 1, 0, 1 would be
> caught in another way..
Yes, we analyze them, but for nothing. They aren't affine either, and hence
result in unknown dependences.
>From gcc-bugs-return-650542-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 12:07:56 2019
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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--- Comment #11 from Martin Liška <marxin at gcc dot gnu.org> ---
And I can also verify that adding -fno-peephole -fno-peephole2 to CFLAGS helps
to resolve the issue.
>From gcc-bugs-return-650543-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 12:11:19 2019
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Subject: [Bug c++/91387] New: Segfault using -flto
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Bug ID: 91387
Summary: Segfault using -flto
Product: gcc
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Created attachment 46684
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46684&action=edit
Preprocessed source code
Hi,
I'm experiencing g++ segfaults during compilation. This is a "minimal" example
in terms of command line parameters, using the preprocessed source (which is
not minimal):
> $ /usr/bin/g++-8 -std=c++14 -O2 -flto -fno-devirtualize -c ShapeContainerTest.ii
> during IPA pass: cp
> /home/tobias/Documents/ArangoDB/arangodb/arangodb/tests/Geo/ShapeContainerTest.cpp: In function ‘arangodb::velocypack::Builder::openCompoundValue(unsigned char) [clone .part.119]’:
> /home/tobias/Documents/ArangoDB/arangodb/arangodb/tests/Geo/ShapeContainerTest.cpp:427:2: internal compiler error: Segmentation fault
> }}
> ^
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <file:///usr/share/doc/gcc-8/README.Bugs> for instructions.
This is with g++ (Ubuntu 8.3.0-6ubuntu1~18.04.1) 8.3.0.
I have two other files exhibiting a similar error, if it's of interest. The one
referenced above is attached.
Please tell me if and how I can be of further help.
Best regards,
Tobias
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Subject: [Bug libgcc/91379] internal compiler error __gcov_fork
Date: Wed, 07 Aug 2019 12:11:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2019-08-07
CC| |marxin at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Note the GCC 4.9 is out of support, please use at least GCC 7.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91388] New: -Wreturn-type "no return statement" warning in function that is already ill-formed
Date: Wed, 07 Aug 2019 12:15:00 -0000
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Bug ID: 91388
Summary: -Wreturn-type "no return statement" warning in
function that is already ill-formed
Product: gcc
Version: 9.1.1
Status: UNCONFIRMED
Keywords: diagnostic
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template<typename T> struct copyable;
template<typename T>
T func(const T& t)
{
static_assert(copyable<T>::value);
return t;
}
struct NoCopy {
NoCopy() { }
NoCopy(const NoCopy&) = delete;
};
template<> struct copyable<NoCopy> { static constexpr bool value = false; };
int main()
{
NoCopy nc;
func(nc);
}
This produces the following diagnostics:
nc.cc:20:10: required from here
nc.cc:6:30: error: static assertion failed
6 | static_assert(copyable<T>::value);
| ^~~~~
nc.cc:7:10: error: use of deleted function 'NoCopy::NoCopy(const NoCopy&)'
7 | return t;
| ^
nc.cc:12:3: note: declared here
12 | NoCopy(const NoCopy&) = delete;
| ^~~~~~
As the author of func<T> I have already added a static assertion to check if
the return statement will be well-formed, so the second error is redundant (and
I'd prefer for my users to not see it, the static assertion is for their
benefit).
So I try writing the function like this instead:
template<typename T>
T func(const T& t)
{
static_assert(copyable<T>::value);
if constexpr (copyable<T>::value)
return t;
}
Now the compiler says:
nc.cc: In instantiation of 'T func(const T&) [with T = NoCopy]':
nc.cc:22:10: required from here
nc.cc:6:30: error: static assertion failed
6 | static_assert(copyable<T>::value);
| ^~~~~
nc.cc:10:1: warning: no return statement in function returning non-void
[-Wreturn-type]
10 | }
| ^
To suppress the warning I need to do:
template<typename T>
T func(const T& t)
{
static_assert(copyable<T>::value);
if constexpr (copyable<T>::value)
return t;
__builtin_unreachable();
}
I don't think it should be necessary to mark it unreachable. The fact the
static assertion failed means it's already guaranteed to be unreachable,
because it's not even compilable!
Could the -Wreturn-type warning be suppressed when the function is already
ill-formed?
I note that clang's -Wreturn-type diagnostic is phrased "warning: control
reaches end of non-void function" and isn't given for ill-formed functions.
That makes sense because control cannot reach the end of a function that cannot
possibly execute.
>From gcc-bugs-return-650546-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 12:39:34 2019
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Subject: [Bug lto/91387] Segfault using -flto
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, I'm reducing that.
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Subject: [Bug lto/91375] [8/9/10 Regression] ICE on valid code in subbinfo_with_vtable_at_offset at ipa-devirt.c:2760 since r256685
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |gcc-bugzilla at tobias dot goedder
| |z.info
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
*** Bug 91387 has been marked as a duplicate of this bug. ***
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Subject: [Bug lto/91387] Segfault using -flto
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |DUPLICATE
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Reduced test-case:
class A {
public:
A();
};
#pragma GCC optimize("fp-contract=off")
class B : virtual A {};
void fn1() { throw B(); }
The suggested fix for the duplicate works.
*** This bug has been marked as a duplicate of bug 91375 ***
>From gcc-bugs-return-650549-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 13:26:26 2019
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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Wilco <wilco at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |wilco at gcc dot gnu.org
--- Comment #12 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #10)
> I'm attaching all tree and rtl dumps for the problematic LTRANS unit:
> https://drive.google.com/file/d/1CW4cWvpm1VVXFIP80XCf1IzYXWwTsynZ/
> view?usp=sharing
>
> I can confirm what Andreas sees:
>
> (note 8303 8031 7890 4 NOTE_INSN_PROLOGUE_END)
> (insn:TI 7890 8303 7889 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
> (const_int 704 [0x2c0])) [63 %sfp+-2912 S8 A64])
> (reg/f:DI 2 x2 [1833])) "../include/list.h":29:13 47 {*movdi_aarch64}
> (nil))
> (insn 7889 7890 7887 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
> (const_int 712 [0x2c8])) [63 %sfp+-2904 S8 A64])
> (reg/f:DI 3 x3 [1834])) "../include/list.h":29:13 47 {*movdi_aarch64}
> (nil))
>
> gets transformed by peephole2 to:
> (note 8303 8031 8556 4 NOTE_INSN_PROLOGUE_END)
> (insn 8556 8303 7887 4 (parallel [
> (set (mem/c:DI (plus:DI (reg:DI 7 x7)
> (const_int 8 [0x8])) [63 %sfp+-2912 S8 A64])
> (reg/f:DI 2 x2 [1833]))
> (set (mem/c:DI (plus:DI (reg:DI 7 x7)
> (const_int 16 [0x10])) [63 %sfp+-2904 S8 A64])
> (reg/f:DI 3 x3 [1834]))
> ]) "../include/list.h":29:13 -1
> (nil))
>
> I don't know what's the meaning of x7 register, but it's not set during main
> function execution.
Basically the backend can combine up to 4 loads or stores and insert an
addressing instruction so that all offsets are in range
(aarch64_gen_adjusted_ldpstp). It appears a later optimization removes the
initialization of x7 as dead and so the address is wrong.
The key question is how does one dump rtl with -flto? It doesn't work at all,
making debugging this difficult...
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
>
> The key question is how does one dump rtl with -flto? It doesn't work at
> all, making debugging this difficult...
It does, look:
marxin@marxinbox:/tmp> gcc -c main.c -flto
marxin@marxinbox:/tmp> gcc main.o -flto -o xxxxxxxx
marxin@marxinbox:/tmp> gcc main.o -flto -o xxxxxxxx -fdump-rtl-all
marxin@marxinbox:/tmp> ls -l xxxxxxx*
-rwxr-xr-x 1 marxin users 20544 Aug 7 15:28 xxxxxxxx
-rw-r--r-- 1 marxin users 1454 Aug 7 15:28 xxxxxxxx.ltrans0.233r.expand
-rw-r--r-- 1 marxin users 1041 Aug 7 15:28 xxxxxxxx.ltrans0.234r.vregs
-rw-r--r-- 1 marxin users 1042 Aug 7 15:28
xxxxxxxx.ltrans0.235r.into_cfglayout
-rw-r--r-- 1 marxin users 1997 Aug 7 15:28 xxxxxxxx.ltrans0.236r.jump
-rw-r--r-- 1 marxin users 1010 Aug 7 15:28 xxxxxxxx.ltrans0.248r.reginfo
-rw-r--r-- 1 marxin users 1069 Aug 7 15:28
xxxxxxxx.ltrans0.269r.outof_cfglayout
-rw-r--r-- 1 marxin users 1041 Aug 7 15:28 xxxxxxxx.ltrans0.270r.split1
-rw-r--r-- 1 marxin users 2389 Aug 7 15:28 xxxxxxxx.ltrans0.272r.dfinit
-rw-r--r-- 1 marxin users 2471 Aug 7 15:28 xxxxxxxx.ltrans0.273r.mode_sw
-rw-r--r-- 1 marxin users 2389 Aug 7 15:28 xxxxxxxx.ltrans0.274r.asmcons
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xxxxxxxx.ltrans0.282r.postreload_jump
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-rw-r--r-- 1 marxin users 1960 Aug 7 15:28 xxxxxxxx.ltrans0.318r.dfinish
>From gcc-bugs-return-650551-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 13:35:22 2019
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From: "wilco at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
Date: Wed, 07 Aug 2019 13:35:00 -0000
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--- Comment #14 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #13)
> >
> > The key question is how does one dump rtl with -flto? It doesn't work at
> > all, making debugging this difficult...
>
> It does, look:
>
> marxin@marxinbox:/tmp> gcc -c main.c -flto
> marxin@marxinbox:/tmp> gcc main.o -flto -o xxxxxxxx
Ah right, so you need an explicit -o<file>, otherwise it doesn't write the dump
files in the current directory...
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Subject: [Bug driver/91130] [9/10 Regression] -MF clashes with -flto on aarch64
Date: Wed, 07 Aug 2019 13:44:00 -0000
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--- Comment #39 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #34)
> So like the following then.
>
> Index: gcc/lto-wrapper.c
> ===================================================================
> --- gcc/lto-wrapper.c (revision 274111)
> +++ gcc/lto-wrapper.c (working copy)
> @@ -133,7 +133,6 @@ maybe_unlink (const char *file)
> static void
> get_options_from_collect_gcc_options (const char *collect_gcc,
> const char *collect_gcc_options,
> - unsigned int lang_mask,
> struct cl_decoded_option
> **decoded_options,
> unsigned int *decoded_options_count)
> {
> @@ -176,8 +175,7 @@ get_options_from_collect_gcc_options (co
> argc = obstack_object_size (&argv_obstack) / sizeof (void *) - 1;
> argv = XOBFINISH (&argv_obstack, const char **);
>
> - decode_cmdline_options_to_array (argc, (const char **)argv,
> - lang_mask,
> + decode_cmdline_options_to_array (argc, (const char **)argv, CL_DRIVER,
> decoded_options, decoded_options_count);
> obstack_free (&argv_obstack, NULL);
> }
> @@ -1009,8 +1007,7 @@ find_and_merge_options (int fd, off_t fi
> {
> struct cl_decoded_option *f2decoded_options;
> unsigned int f2decoded_options_count;
> - get_options_from_collect_gcc_options (collect_gcc,
> - fopts, CL_LANG_ALL,
> + get_options_from_collect_gcc_options (collect_gcc, fopts,
> &f2decoded_options,
> &f2decoded_options_count);
> if (!fdecoded_options)
> @@ -1283,7 +1280,6 @@ run_gcc (unsigned argc, char *argv[])
> fatal_error (input_location,
> "environment variable %<COLLECT_GCC_OPTIONS%> must be set");
> get_options_from_collect_gcc_options (collect_gcc, collect_gcc_options,
> - CL_LANG_ALL,
> &decoded_options,
> &decoded_options_count);
Great, the patch works on aarch64. So the problem I saw before was probably
related to the second usage of CL_LANG_ALL that I didn't replace with
CL_DRIVER.
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Subject: [Bug tree-optimization/91109] [10 regression][arm] gcc.c-torture/execute/20040709-1.c fails since r273135
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--- Comment #9 from Bernd Edlinger <edlinger at gcc dot gnu.org> ---
Author: edlinger
Date: Wed Aug 7 13:45:06 2019
New Revision: 274163
URL: https://gcc.gnu.org/viewcvs?rev=274163&root=gcc&view=rev
Log:
2019-08-07 Bernd Edlinger <bernd.edlinger@hotmail.de>
PR tree-optimization/91109
* lra-remat.c (update_scratch_ops): Remove assignment of the
hard register.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/lra-remat.c
>From gcc-bugs-return-650554-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 13:59:35 2019
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Subject: [Bug sanitizer/91389] New: [7/8/9/10 Regression] error: control reaches end of non-void function with -fsanitize=thread since r219201
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Bug ID: 91389
Summary: [7/8/9/10 Regression] error: control reaches end of
non-void function with -fsanitize=thread since r219201
Product: gcc
Version: unknown
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jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
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Starting from the revision we generate a warning:
$ cat godot2.ii
class A {
struct B {
enum {} type;
};
B *m_fn1();
};
A::B *A::m_fn1() {
B *a;
switch (a->type) {
break;
default:
return a;
}
}
$ g++ -c godot2.ii -c -Werror=return-type
$ g++ -c godot2.ii -c -Werror=return-type -fsanitize=thread
godot2.ii: In member function ‘A::B* A::m_fn1()’:
godot2.ii:14:1: error: control reaches end of non-void function
[-Werror=return-type]
14 | }
| ^
cc1plus: some warnings being treated as errors
Can you Jakub please take a look?
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Subject: [Bug fortran/91390] New: treatment of extra parameter in a subroutine call
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Bug ID: 91390
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==== file1.f =====
program test
n=10
c correct call
call s('hej')
c one extra parameter
call s('hej',n)
end
==== file2.f =====
subroutine s(a)
character a*(*)
print *, len(a)
end
First call is correct, the second call prints garbage.
(of course, it is not a bug, but a feature of handling
strings as a parameter).
>From gcc-bugs-return-650556-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 14:08:39 2019
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Subject: [Bug rtl-optimization/91332] ICE: Segfault in gfortran when compiling massive subroutine with -O3
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--- Comment #2 from Madarpok . <clogged.drainpipe at gmail dot com> ---
I can confirm that raising the stack limit with ulimit -s unlimited does not
prevent this crash.
Something inside gfortran is breaking/overflowing.
>From gcc-bugs-return-650557-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 14:16:01 2019
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Subject: [Bug sanitizer/91389] [7/8/9/10 Regression] error: control reaches end of non-void function with -fsanitize=thread since r219201
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Don't do it then? The no fallthru early discovery isn't perfect and with the
sanitizer instrumentation it gets even harder.
Looks like a dup of PR86899 to me anyway.
If I do a small modification like:
class A {
struct B {
enum {} type;
};
B *m_fn1();
};
struct C { C (); ~C (); };
A::B *A::m_fn1() {
C c;
B *a;
switch (a->type) {
break;
default:
return a;
}
}
then it emits the false positive warning even with just -O0 -Wreturn-type.
I really think it doesn't hurt if people remove the clearly unreachable code
from their code to get rid of this warning.
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Subject: [Bug translation/79618] prevent missing space in multiline string literals
Date: Wed, 07 Aug 2019 14:18:00 -0000
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--- Comment #9 from Martin Sebor <msebor at gcc dot gnu.org> ---
It doesn't. -Wformat-diag runs after adjacent string literals have been
concatenated. Detecting these kinds of issues would mean enhancing the
preprocessor.
>From gcc-bugs-return-650559-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 14:21:16 2019
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Subject: [Bug c++/91346] Implement P1668R1: Permit unevaluated inline asm in constexpr functions
Date: Wed, 07 Aug 2019 14:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91346
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Wed Aug 7 14:20:40 2019
New Revision: 274169
URL: https://gcc.gnu.org/viewcvs?rev=274169&root=gcc&view=rev
Log:
PR c++/91346 - Implement P1668R1, allow unevaluated asm in constexpr.
* constexpr.c (cxx_eval_constant_expression): Handle ASM_EXPR.
(potential_constant_expression_1) <case ASM_EXPR>: Allow.
* cp-tree.h (finish_asm_stmt): Adjust.
* parser.c (cp_parser_asm_definition): Grab the locaion of "asm" and
use it. Change an error to a pedwarn. Allow asm in C++2a, warn
otherwise.
* pt.c (tsubst_expr): Pass a location down to finish_asm_stmt.
* semantics.c (finish_asm_stmt): New location_t parameter. Use it.
* g++.dg/cpp2a/inline-asm1.C: New test.
* g++.dg/cpp2a/inline-asm2.C: New test.
* g++.dg/cpp1y/constexpr-neg1.C: Adjust dg-error.
Added:
trunk/gcc/testsuite/g++.dg/cpp2a/inline-asm1.C
trunk/gcc/testsuite/g++.dg/cpp2a/inline-asm2.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/constexpr.c
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/parser.c
trunk/gcc/cp/pt.c
trunk/gcc/cp/semantics.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/cpp1y/constexpr-neg1.C
>From gcc-bugs-return-650560-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 14:21:47 2019
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Subject: [Bug c++/91346] Implement P1668R1: Permit unevaluated inline asm in constexpr functions
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----------------------------------------------------------------------------
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Implemented for 10.1.
>From gcc-bugs-return-650561-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 14:24:38 2019
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Subject: [Bug tree-optimization/91227] pointer relational expression not folded but equivalent inequality is
Date: Wed, 07 Aug 2019 14:24:00 -0000
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--- Comment #17 from Martin Sebor <msebor at gcc dot gnu.org> ---
Just to be clear: my suggestion to fold the relational expressions is only for
incoming pointers with addresses of local variables that GCC already assumes
cannot be synthesized (I assume it does that on the basis of what the
provenance proposals refer to as address nondeterminism). I am not suggesting
to fold arbitrary relational expressions in general.
>From gcc-bugs-return-650562-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 14:34:54 2019
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
Date: Wed, 07 Aug 2019 14:34:00 -0000
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--- Comment #15 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
From looking at the dumps it would appear that one of the STP generating
peepholes might have bailed out, but that some of the changes have not been
undone.
From the pass before, we have:
(insn/f:TI 8028 8027 8029 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 672 [0x2a0])) [17 S8 A8])
(reg:DI 25 x25)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 25 x25)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 672 [0x2a0])) [17 S8 A8])
(reg:DI 25 x25))
(nil))))
(insn/f 8029 8028 8030 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 680 [0x2a8])) [17 S8 A8])
(reg:DI 26 x26)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 26 x26)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 680 [0x2a8])) [17 S8 A8])
(reg:DI 26 x26))
(nil))))
(insn/f:TI 8030 8029 8031 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 688 [0x2b0])) [17 S8 A8])
(reg:DI 27 x27)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 27 x27)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 688 [0x2b0])) [17 S8 A8])
(reg:DI 27 x27))
(nil))))
(insn/f 8031 8030 8303 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 696 [0x2b8])) [17 S8 A8])
(reg:DI 28 x28)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 28 x28)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 696 [0x2b8])) [17 S8 A8])
(reg:DI 28 x28))
Which looks like a perfect candidate for replacing with two STP instructions.
After peepholing, we have:
(insn/f:TI 8028 8027 8029 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 672 [0x2a0])) [17 S8 A8])
(reg:DI 25 x25)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 25 x25)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 672 [0x2a0])) [17 S8 A8])
(reg:DI 25 x25))
(nil))))
(insn/f 8029 8028 8030 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 680 [0x2a8])) [17 S8 A8])
(reg:DI 26 x26)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 26 x26)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 680 [0x2a8])) [17 S8 A8])
(reg:DI 26 x26))
(nil))))
(insn/f:TI 8030 8029 8031 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 688 [0x2b0])) [17 S8 A8])
(reg:DI 27 x27)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 27 x27)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 688 [0x2b0])) [17 S8 A8])
(reg:DI 27 x27))
(nil))))
(insn/f 8031 8030 8303 4 (set (mem/c:DI (reg:DI 7 x7) [17 S8 A8])
(reg:DI 28 x28)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 28 x28)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 696 [0x2b8])) [17 S8 A8])
(reg:DI 28 x28))
(nil))))
And we can see that the last insn has been modified. There's nothing earlier
in the log to suggest that there was any substitution here.
My suspicion is this hunk:
replace_equiv_address_nv (mem_1, plus_constant (Pmode, operands[8],
new_off_1), true);
replace_equiv_address_nv (mem_2, plus_constant (Pmode, operands[8],
new_off_1 + msize), true);
replace_equiv_address_nv (mem_3, plus_constant (Pmode, operands[8],
new_off_3), true);
replace_equiv_address_nv (mem_4, plus_constant (Pmode, operands[8],
new_off_3 + msize), true);
if (!aarch64_mem_pair_operand (mem_1, mode)
|| !aarch64_mem_pair_operand (mem_3, mode))
return false;
Is somehow modifying the insn in-place, but then the test is failing somehow.
>From gcc-bugs-return-650563-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 14:38:01 2019
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Subject: [Bug c++/91391] New: Bogus -Wcomma-subscript
Date: Wed, 07 Aug 2019 14:38:00 -0000
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Bug ID: 91391
Summary: Bogus -Wcomma-subscript
Product: gcc
Version: 10.0
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With recent git master (4ad9380bafd772cea54392c7189cab07a2121fc9 here):
> $ cat test.cc
> #include <map>
> #include <utility>
> int main() {
> std::map<std::pair<int, int>, int> m;
> m[std::pair<int, int>(0, 0)] = 0;
> }
> $ g++ -fsyntax-only -std=c++2a test.cc
> test.cc: In function ‘int main()’:
> test.cc:5:20: warning: top-level comma expression in array subscript is deprecated [-Wcomma-subscript]
> 5 | m[std::pair<int, int>(0, 0)] = 0;
> | ^
It should apparently not warn about the nested comma in the
template-parameter-list, and I wonder whether it should warn about a
(hypothetical) comma expression in a call to an overloaded operator [] at all.
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Subject: [Bug c++/91391] Bogus -Wcomma-subscript
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-08-07
CC| |mpolacek at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Mine, we shouldn't warn about ',' nested in < >.
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From: "cbunch at cfhp dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgcc/91379] internal compiler error __gcov_fork
Date: Wed, 07 Aug 2019 14:49:00 -0000
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--- Comment #2 from Clinton Bunch <cbunch at cfhp dot com> ---
As I stated, I've tried to compile 4.9.4, 5.3.0, 5.5.0, 6.1.0, 6.5.0 and 8.3.0
I get the same error on all of them. I reported on 9.1.0 as it is the current
version. I can't get a gcc more recent than 4.9.2 to even attempt a build and
none of these versions will compile with the HP C/C++ compiler.
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Subject: [Bug c++/91388] -Wreturn-type "no return statement" warning in function that is already ill-formed
Date: Wed, 07 Aug 2019 15:02:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
--- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> ---
related to and/or possible dup of bug 60440?
>From gcc-bugs-return-650567-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 15:10:40 2019
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From: "barry.revzin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91380] Requesting a better diagnostic for dumb include mistake
Date: Wed, 07 Aug 2019 15:10:00 -0000
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--- Comment #3 from Barry Revzin <barry.revzin at gmail dot com> ---
In case it's at all helpful, here's the clang review that Tim found for this
diagnostic: https://reviews.llvm.org/D51333
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91334] [10 Regression] ICE in propagate_necessity at gcc/tree-ssa-dce.c:813 since r273791
Date: Wed, 07 Aug 2019 15:26:00 -0000
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--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
[hjl@gnu-mic-1 build_base_lto.0000]$
/export/gnu/import/git/gcc-test-spec-lto/usr/bin/g++ -S -DSPEC_CPU -DNDEBUG
-DAPP_NO_THREADS -DXALAN_INMEM_MSG_LOADER -I. -Ixercesc -Ixercesc/dom
-Ixercesc/dom/impl -Ixercesc/sax -Ixercesc/util/MsgLoaders/InMemory
-Ixercesc/util/Transcoders/Iconv -Ixalanc/include -DPROJ_XMLPARSER
-DPROJ_XMLUTIL -DPROJ_PARSERS -DPROJ_SAX4C -DPROJ_SAX2 -DPROJ_DOM
-DPROJ_VALIDATORS -DXML_USE_NATIVE_TRANSCODER -DXML_USE_INMEM_MESSAGELOADER -O2
-DSPEC_CPU_LP64 -DSPEC_CPU_LINUX XPath.cpp -ffast-math
In file included from ./XPathDefinitions.hpp:21,
from XPath.hpp:22,
from XPath.cpp:18:
XPath.cpp: In member function ‘void
xalanc_1_8::XPath::executeMore(xalanc_1_8::XalanNode*,
xalanc_1_8::XPath::OpCodeMapPositionType, xalanc_1_8::XPathExecutionContext&,
xalanc_1_8::FormatterListener&, xalanc_1_8::XPath::MemberFunctionPtr) const’:
./PlatformDefinitions.hpp:66:35: internal compiler error: Segmentation fault
66 | #define XALAN_CPP_NAMESPACE_END }
| ^
XPath.cpp:5696:1: note: in expansion of macro ‘XALAN_CPP_NAMESPACE_END’
5696 | XALAN_CPP_NAMESPACE_END
| ^~~~~~~~~~~~~~~~~~~~~~~
0xfbcc0f crash_signal
../../src-trunk/gcc/toplev.c:326
0xb26b73 lookup_page_table_entry
../../src-trunk/gcc/ggc-page.c:632
0xb26b73 ggc_set_mark(void const*)
../../src-trunk/gcc/ggc-page.c:1531
0xd6a781 gt_ggc_mx_symtab_node(void*)
/export/gnu/import/git/gcc-test-spec-lto/bld/gcc/gtype-desc.c:1302
0xee51fd gt_ggc_ma_order
./gt-passes.h:31
0xee51fd gt_ggc_ma_order
./gt-passes.h:26
0xcf6995 ggc_mark_root_tab
../../src-trunk/gcc/ggc-common.c:77
0xcf6b9c ggc_mark_roots()
../../src-trunk/gcc/ggc-common.c:94
0xb274f5 ggc_collect()
../../src-trunk/gcc/ggc-page.c:2201
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[hjl@gnu-mic-1 build_base_lto.0000]$
-O2 -ffast-math is needed to trigger ICE.
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91391] Bogus -Wcomma-subscript
Date: Wed, 07 Aug 2019 15:29:00 -0000
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
...except when it's:
void
fn (int *a, int b, int c)
{
a[b < c, b > c]; // should warn
}
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/91285] _Pragma does not work in a useful fashion
Date: Wed, 07 Aug 2019 15:31:00 -0000
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--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Note that all the standard C pragmas are even more restricted than GCC's
statement-like pragmas - the standard pragmas (which aren't implemented in
GCC) are defined by the C standard to be allowed only "either outside
external declarations or preceding all explicit declarations and
statements inside a compound statement".
The wider the range of contexts in which a pragma is permitted, the harder
it is to define its semantics. For diagnostic pragmas, note that some
diagnostics are associated with a *range* of locations within an
expression, leading to obvious questions about the semantics if diagnostic
pragma state varies within that range. (Though that could also arise when
statement-like pragmas are used within the existing statement expression
extension.)
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |rearnsha at gcc dot gnu.org
--- Comment #16 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
I had the wrong set of insns previously. The problem cases are:
(insn/f 8031 8030 8303 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 696 [0x2b8])) [17 S8 A8])
(reg:DI 28 x28)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 28 x28)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 696 [0x2b8])) [17 S8 A8])
(reg:DI 28 x28))
(nil))))
(note 8303 8031 7890 4 NOTE_INSN_PROLOGUE_END)
(insn:TI 7890 8303 7889 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 704 [0x2c0])) [63 %sfp+-2912 S8 A64])
(reg/f:DI 2 x2 [1833])) "../include/list.h":29:13 47 {*movdi_aarch64}
(nil))
(insn 7889 7890 7887 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 712 [0x2c8])) [63 %sfp+-2904 S8 A64])
(reg/f:DI 3 x3 [1834])) "../include/list.h":29:13 47 {*movdi_aarch64}
(nil))
(insn:TI 7887 7889 229 4 (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 720 [0x2d0])) [63 %sfp+-2896 S8 A64])
(reg/f:DI 4 x4 [1838])) "log.c":422:11 47 {*movdi_aarch64}
(nil))
Which after peephole2 is transformed to:
(insn/f 8031 8030 8303 4 (set (mem/c:DI (reg:DI 7 x7) [17 S8 A8])
(reg:DI 28 x28)) 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 28 x28)
(expr_list:REG_CFA_OFFSET (set (mem/c:DI (plus:DI (reg/f:DI 31 sp)
(const_int 696 [0x2b8])) [17 S8 A8])
(reg:DI 28 x28))
(nil))))
(note 8303 8031 8556 4 NOTE_INSN_PROLOGUE_END)
(insn 8556 8303 7887 4 (parallel [
(set (mem/c:DI (plus:DI (reg:DI 7 x7)
(const_int 8 [0x8])) [63 %sfp+-2912 S8 A64])
(reg/f:DI 2 x2 [1833]))
(set (mem/c:DI (plus:DI (reg:DI 7 x7)
(const_int 16 [0x10])) [63 %sfp+-2904 S8 A64])
(reg/f:DI 3 x3 [1834]))
]) "../include/list.h":29:13 -1
(nil))
(insn:TI 7887 8556 8557 4 (set (mem/c:DI (plus:DI (reg:DI 7 x7)
(const_int 24 [0x18])) [63 %sfp+-2896 S8 A64])
(reg/f:DI 4 x4 [1838])) "log.c":422:11 47 {*movdi_aarch64}
(expr_list:REG_DEAD (reg/f:DI 4 x4 [1838])
(nil)))
In this case, it looks like one of the 4-store peepholes has been partially
applied, and then failed for some reason, but the modifications have not been
unwound. (there is then a second peephole that does match the second and third
stores which confuses things a bit).
The reason for the non-match is that one of the insns has a frame-related note
set on it, but the peephole produces three output isns and we can't handle
that.
I think the fix is to make a full copy of the mems before doing the adjust;
then if the change is unwound we haven't modified the original insns by
mistake.
>From gcc-bugs-return-650572-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 15:58:39 2019
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From: "harry.onslow at emenda dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/91392] New: g++: internal compiler error: Aborted (program cc1plus)
Date: Wed, 07 Aug 2019 15:58:00 -0000
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Bug ID: 91392
Summary: g++: internal compiler error: Aborted (program
cc1plus)
Product: gcc
Version: 6.3.0
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Component: c
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Created attachment 46685
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46685&action=edit
the preprocessed file (*.ii*) that triggers the bug
Hi Support,
Please find the required details below.
Regards,
Harry
D:\workspace\cases\6088\workspace>g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=d:/mingw/bin/../libexec/gcc/mingw32/6.3.0/lto-wrapper.exe
Target: mingw32
Configured with: ../src/gcc-6.3.0/configure --build=x86_64-pc-linux-gnu
--host=mingw32 --with-gmp=/mingw --with-mpfr=/mingw --with-mpc=/mingw
--with-isl=/mingw --prefix=/mingw --disable-win32-registry --target=mingw32
--with-arch=i586 --enable-languages=c,c++,objc,obj-c++,fortran,ada
--with-pkgversion='MinGW.org GCC-6.3.0-1' --enable-static --enable-shared
--enable-threads --with-dwarf2 --disable-sjlj-exceptions
--enable-version-specific-runtime-libs --with-libiconv-prefix=/mingw
--with-libintl-prefix=/mingw --enable-libstdcxx-debug --with-tune=generic
--enable-libgomp --disable-libvtv --enable-nls
Thread model: win32
gcc version 6.3.0 (MinGW.org GCC-6.3.0-1)
D:\workspace\cases\6088\workspace>g++ -c -std=c++14 10_MISRA.PTR.ARITH.cpp
-save-temps
10_MISRA.PTR.ARITH.cpp: In constructor
'workspace::project::Wrapper::Wrapper(workspace::project::Wrapper&&)':
10_MISRA.PTR.ARITH.cpp:8:8: internal compiler error: in finish_expr_stmt, at
cp/semantics.c:677
struct Wrapper
^~~~~~~
10_MISRA.PTR.ARITH.cpp:8:8: internal compiler error: Aborted
g++: internal compiler error: Aborted (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
>From gcc-bugs-return-650573-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 15:59:02 2019
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
Date: Wed, 07 Aug 2019 15:59:00 -0000
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--- Comment #17 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Created attachment 46686
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46686&action=edit
candidate patch
Could you try this patch please? So far only very lightly tested.
>From gcc-bugs-return-650574-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 16:00:50 2019
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Subject: [Bug tree-optimization/88771] Misleading -Werror=array-bounds error
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|9.2 |---
--- Comment #24 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jeffrey A. Law from comment #22)
> Martin cleaned up the warning message and I'm considering that as fixing the
> regression. Thus regression marker removed.
So... that means the target milestone can be removed, too, right? I'm doing
that
>
> I doubt everyone is in agreement on the overall "should we warn or not"
> question. So I'm keeping the BZ open. I wouldn't be at all surprised if
> there is no consensus possible WRT whether or not we should be warning.
> Which usually leads to a flag to enable/disable the particular behavior ;(
>From gcc-bugs-return-650575-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 16:02:00 2019
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|9.2 |---
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
non-regressions don't get a target milestone
>From gcc-bugs-return-650576-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 16:03:15 2019
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From: "tromey at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug jit/91330] JIT "dir" entry for info is incomplete
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--- Comment #1 from Tom Tromey <tromey at gcc dot gnu.org> ---
This is pretty easy to fix in gcc/jit/docs/conf.py:
diff --git a/gcc/jit/docs/conf.py b/gcc/jit/docs/conf.py
index 3e630db47ef..1224bdcc07d 100644
--- a/gcc/jit/docs/conf.py
+++ b/gcc/jit/docs/conf.py
@@ -244,7 +244,7 @@ man_pages = [
# dir menu entry, description, category)
texinfo_documents = [
('index', 'libgccjit', u'libgccjit Documentation',
- u'David Malcolm', 'libgccjit', 'One line description of project.',
+ u'David Malcolm', 'libgccjit', 'GCC-based Just In Time compiler library.',
'Miscellaneous'),
]
However, I don't have the version of sphinx that was used to generate
the docs, and when I run the version I do have, there are tons of changes.
So, maybe someone else ought to do this part.
>From gcc-bugs-return-650577-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 16:04:08 2019
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Subject: [Bug rtl-optimization/91154] [10 Regression] 456.hmmer regression on Haswell caused by r272922
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |segher at gcc dot gnu.org
--- Comment #19 from Segher Boessenkool <segher at gcc dot gnu.org> ---
So how does this cause 12% degradation (20% by some other measurements)
on power9? Pretty much everything is the *opposite* way around for us:
we do have cheap conditional moves, we do prefer integer registers.
>From gcc-bugs-return-650578-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 16:16:31 2019
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Subject: [Bug driver/91130] [9/10 Regression] -MF clashes with -flto on aarch64
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--- Comment #40 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Author: rearnsha
Date: Wed Aug 7 16:15:35 2019
New Revision: 274176
URL: https://gcc.gnu.org/viewcvs?rev=274176&root=gcc&view=rev
Log:
PR driver/91130 Use CL_DRIVER when handling of COLLECT_GCC_OPTIONS in
lto-wrapper.c
Some options are handled differently by the main driver (gcc, g++,
etc) from the back-end compiler programs (cc1, cc1plus, etc) in that
in the driver they do not take an additional argument, while in the
compiler programs they do. The processing option option CL_DRIVER
controls this alternative interpretation of the options.
The environment variable COLLECT_GCC_OPTIONS is the list of options to
add to a compile if the compiler re-invokes itself at some point. As
such, the options are driver options, so CL_DRIVER should be used when
processing this list. Currently lto-wrapper is doing this
incorrectly.
PR driver/91130
* lto-wrapper.c (find_and_merge_options): Use CL_DRIVER when
processing COLLECT_GCC_OPTIONS.
(run_gcc): Likewise.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/lto-wrapper.c
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Subject: [Bug driver/91130] [9 Regression] -MF clashes with -flto on aarch64
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Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[9/10 Regression] -MF |[9 Regression] -MF clashes
|clashes with -flto on |with -flto on aarch64
|aarch64 |
--- Comment #41 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Fixed on trunk so far.
>From gcc-bugs-return-650580-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 16:34:45 2019
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91388] -Wreturn-type "no return statement" warning in function that is already ill-formed
Date: Wed, 07 Aug 2019 16:34:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=60440
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
That's for C and this is very specifically about C++ (as I'm attempting to
suppress duplicate errors after manually diagnosing ill-formed instantiations
of a template, via type traits and if-constexpr ... none of which exist in C
:-)
Definitely appropriate for the "See Also" field though, thanks.
>From gcc-bugs-return-650581-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 16:35:37 2019
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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/91393] New: lto1: internal compiler error: decompressed stream: Destination buffer is too small
Date: Wed, 07 Aug 2019 16:35:00 -0000
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Bug ID: 91393
Summary: lto1: internal compiler error: decompressed stream:
Destination buffer is too small
Product: gcc
Version: 10.0
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Priority: P3
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Command line is
gcc -shared -fPIC -DPIC .libs/__fxstatat.o .libs/__fxstatat64.o
.libs/__getcwd_chk.o .libs/__getwd_chk.o .libs/__lxstat.o .libs/__lxstat64.o
.libs/__open.o .libs/__open64.o .libs/__open64_2.o .libs/__open_2.o
.libs/__openat64_2.o .libs/__openat_2.o .libs/__opendir2.o
.libs/__readlink_chk.o .libs/__readlinkat_chk.o .libs/__realpath_chk.o
.libs/__statfs.o .libs/__xmknod.o .libs/__xmknodat.o .libs/__xstat.o
.libs/__xstat64.o .libs/_xftw.o .libs/_xftw64.o .libs/access.o .libs/acct.o
.libs/audit_log_acct_message.o .libs/bind.o .libs/bindtextdomain.o
.libs/canonicalize_file_name.o .libs/chdir.o .libs/chmod.o .libs/chown.o
.libs/chroot.o .libs/clearenv.o .libs/connect.o .libs/creat.o .libs/creat64.o
.libs/dedotdot.o .libs/dl_iterate_phdr.o .libs/dladdr.o .libs/dlmopen.o
.libs/dlopen.o .libs/eaccess.o .libs/euidaccess.o .libs/execl.o .libs/execle.o
.libs/execlp.o .libs/execv.o .libs/execve.o .libs/execvp.o .libs/faccessat.o
.libs/fchmodat.o .libs/fchownat.o .libs/fopen.o .libs/fopen64.o .libs/freopen.o
.libs/freopen64.o .libs/fts.o .libs/fts64.o .libs/ftw.o .libs/ftw64.o
.libs/futimesat.o .libs/get_current_dir_name.o .libs/getcwd.o
.libs/getcwd_real.o .libs/getpeername.o .libs/getsockname.o .libs/getwd.o
.libs/getxattr.o .libs/glob.o .libs/glob64.o .libs/glob_pattern_p.o
.libs/inotify_add_watch.o .libs/lchmod.o .libs/lchown.o .libs/lckpwdf.o
.libs/lgetxattr.o .libs/libfakechroot.o .libs/link.o .libs/linkat.o
.libs/listxattr.o .libs/llistxattr.o .libs/lremovexattr.o .libs/lsetxattr.o
.libs/lstat.o .libs/lstat64.o .libs/lutimes.o .libs/mkdir.o .libs/mkdirat.o
.libs/mkdtemp.o .libs/mkfifo.o .libs/mkfifoat.o .libs/mknod.o .libs/mknodat.o
.libs/mkostemp.o .libs/mkostemp64.o .libs/mkostemps.o .libs/mkostemps64.o
.libs/mkstemp.o .libs/mkstemp64.o .libs/mkstemps.o .libs/mkstemps64.o
.libs/mktemp.o .libs/open.o .libs/open64.o .libs/openat.o .libs/openat64.o
.libs/opendir.o .libs/pathconf.o .libs/popen.o .libs/posix_spawn.o
.libs/posix_spawnp.o .libs/rawmemchr.o .libs/readlink.o .libs/readlinkat.o
.libs/realpath.o .libs/rel2abs.o .libs/rel2absat.o .libs/remove.o
.libs/removexattr.o .libs/rename.o .libs/renameat.o .libs/revoke.o
.libs/rmdir.o .libs/rpl_lstat.o .libs/scandir.o .libs/scandir64.o
.libs/setenv.o .libs/setxattr.o .libs/stat.o .libs/stat64.o .libs/statfs.o
.libs/statfs64.o .libs/statvfs.o .libs/statvfs64.o .libs/stpcpy.o
.libs/strchrnul.o .libs/strlcpy.o .libs/symlink.o .libs/symlinkat.o
.libs/system.o .libs/tempnam.o .libs/tmpnam.o .libs/truncate.o
.libs/truncate64.o .libs/ulckpwdf.o .libs/unlink.o .libs/unlinkat.o
.libs/utime.o .libs/utimensat.o .libs/utimes.o -ldl -Wl,-z,now
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld -O2 -g -fstack-protector-strong
-grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -Wl,-z
-Wl,relro -Wl,--as-needed -Wl,-z -Wl,now
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld -Wl,-soname
-Wl,libfakechroot.so -o .libs/libfakechroot.so
lto1: internal compiler error: decompressed stream: Destination buffer is too
small
0xb95044 lto_uncompression_zstd
../../trunk/gcc/lto-compress.c:170
0xb95044 lto_end_uncompression(lto_compression_stream*, lto_compression)
../../trunk/gcc/lto-compress.c:408
0xb92f7c lto_get_section_data(lto_file_decl_data*, lto_section_type, char
const*, unsigned long*, bool)
../../trunk/gcc/lto-section-in.c:164
0x86876c cgraph_node::get_untransformed_body()
../../trunk/gcc/cgraph.c:3578
What would I need to do to encourage zstd to use a larger buffer ?
svn blame says
272996 marxin if (ZSTD_isError (dsize))
272996 marxin internal_error ("decompressed stream: %s",
ZSTD_getErrorName (dsize));
>From gcc-bugs-return-650582-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 16:40:53 2019
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From: "tomas_paukrt at conel dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91394] New: C++ ABI incompatibility (stdexcept)
Date: Wed, 07 Aug 2019 16:40:00 -0000
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Bug ID: 91394
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Some C++ programs cross-compiled with GCC 7.4.0 using -std=gnu++11 do not work
on a system which have glibc 2.25 cross-compiled with GCC 4.9.4 even if the
symbol _GLIBCXX_USE_CXX11_ABI was set to zero during cross-compilation.
There are several places in the file "stdexcept" like this:
> class out_of_range : public logic_error
> {
> public:
> explicit out_of_range(const string& __arg) _GLIBCXX_TXN_SAFE;
> #if __cplusplus >= 201103L
> explicit out_of_range(const char*) _GLIBCXX_TXN_SAFE;
> #endif
> virtual ~out_of_range() _GLIBCXX_USE_NOEXCEPT;
> };
A program that calls constructor out_of_range(const char*) will be using symbol
_ZNSt12out_of_rangeC1EPKc@GLIBCXX_3.4.21 which is not present on the old
system, so I suggest to change the conditional compilation on such places to
this:
> #if _GLIBCXX_USE_CXX11_ABI && __cplusplus >= 201103L
> explicit out_of_range(const char*) _GLIBCXX_TXN_SAFE;
> #endif
>From gcc-bugs-return-650583-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 17:00:45 2019
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Subject: [Bug c/88451] No rounding in fixed-point arithmetic (Decimal to fixed-point conversion, multiplication)
Date: Wed, 07 Aug 2019 17:00:00 -0000
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--- Comment #6 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I don't think anyone has really been maintaining the fixed-point support
for a very long time.
>From gcc-bugs-return-650584-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 17:04:08 2019
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Subject: [Bug c++/91391] Bogus -Wcomma-subscript
Date: Wed, 07 Aug 2019 17:04:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #2)
> ...except when it's:
>
> void
> fn (int *a, int b, int c)
> {
> a[b < c, b > c]; // should warn
> }
Maybe handle it instead with a parser flag that in certain contexts you
temporarily enable or disable?
Temporarily enable when parsing the [] expression and temporarily disable when
parsing an assignment expression?
Or instead hand inline cp_parser_expression into
cp_parser_postfix_open_square_expression and do the warning in the inlined
code?
Or add another defaulted argument to cp_parser_expression and only warn if that
argument is true and only pass true if called from
cp_parser_postfix_open_square_expression?
Or somehow merge the cast_p, decltype_p and this new warn_comma_p into a
bitmask (using enum?) and just pass one argument instead of 3?
>From gcc-bugs-return-650585-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 17:05:32 2019
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Subject: [Bug c/82967] "did you mean" suggestions are way too suggestive
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|9.2 |8.5
--- Comment #14 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #11)
> Fixed on trunk; keeping open until I backport it to gcc-8-branch.
adjusting target milestone then
>From gcc-bugs-return-650586-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 17:13:38 2019
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Subject: [Bug preprocessor/81419] GCC wrongly suggests function-like macro as fixit hint for undefined object-like macro
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81419
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #2)
> (In reply to Martin Sebor from comment #1)
> > Confirmed. There are few other similar bugs for these fix-it hints (e.g.,
> > pr80567 or pr80684). I haven't looked at the implementation but from the
> > symptoms it feels like the problem is that the search doesn't fully consider
> > the context in which the undeclared is used. I.e., it doesn't distinguish
> > between a function call, other kinds of expressions, a type, or even a
> > keyword, etc.
>
> Hopefully GCC can learn to make these distinctions in time for GCC 9.
er, well, GCC 10 now
>From gcc-bugs-return-650587-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 17:18:24 2019
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Subject: [Bug c/67224] UTF-8 support for identifier names in GCC
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--- Comment #30 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
https://git.savannah.gnu.org/cgit/gnulib.git/plain/doc/Copyright/request-assign.future
is the form to complete and send to assign@gnu.org (to do an assignment
covering past and future changes to GCC, which is usually the best one to
use).
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Subject: [Bug c++/81429] maybe_unused attribute triggers syntax error when used on first argument to a constructor
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--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Wed Aug 7 17:32:12 2019
New Revision: 274181
URL: https://gcc.gnu.org/viewcvs?rev=274181&root=gcc&view=rev
Log:
PR c++/81429 - wrong parsing of constructor with C++11 attribute.
* parser.c (cp_parser_constructor_declarator_p): Handle the scenario
when a parameter declaration begins with [[attribute]].
* g++.dg/cpp0x/gen-attrs-68.C: New test.
* g++.dg/cpp0x/gen-attrs-69.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/gen-attrs-68.C
trunk/gcc/testsuite/g++.dg/cpp0x/gen-attrs-69.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/81429] maybe_unused attribute triggers syntax error when used on first argument to a constructor
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--- Comment #9 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed on trunk, will backport to 9.3 later.
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Subject: [Bug translation/90117] Replace %<%s%> with %qs
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
Martin, does -Wformat-diag catch this?
>From gcc-bugs-return-650591-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 18:33:31 2019
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Subject: [Bug c++/91391] Bogus -Wcomma-subscript
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/cp/parser.c.jj 2019-08-07 09:24:36.099089282 +0200
+++ gcc/cp/parser.c 2019-08-07 20:26:47.669663334 +0200
@@ -2102,7 +2102,7 @@ static cp_expr cp_parser_assignment_expr
static enum tree_code cp_parser_assignment_operator_opt
(cp_parser *);
static cp_expr cp_parser_expression
- (cp_parser *, cp_id_kind * = NULL, bool = false, bool = false);
+ (cp_parser *, cp_id_kind * = NULL, bool = false, bool = false, bool =
false);
static cp_expr cp_parser_constant_expression
(cp_parser *, bool = false, bool * = NULL, bool = false);
static cp_expr cp_parser_builtin_offsetof
@@ -7524,33 +7524,9 @@ cp_parser_postfix_open_square_expression
index = cp_parser_braced_list (parser, &expr_nonconst_p);
}
else
- {
- /* [depr.comma.subscript]: A comma expression appearing as
- the expr-or-braced-init-list of a subscripting expression
- is deprecated. A parenthesized comma expression is not
- deprecated. */
- if (warn_comma_subscript)
- {
- /* Save tokens so that we can put them back. */
- cp_lexer_save_tokens (parser->lexer);
-
- /* Look for ',' that is not nested in () or {}. */
- if (cp_parser_skip_to_closing_square_bracket_1 (parser,
- CPP_COMMA) == -1)
- {
- auto_diagnostic_group d;
- warning_at (cp_lexer_peek_token (parser->lexer)->location,
- OPT_Wcomma_subscript,
- "top-level comma expression in array subscript "
- "is deprecated");
- }
-
- /* Roll back the tokens we skipped. */
- cp_lexer_rollback_tokens (parser->lexer);
- }
-
- index = cp_parser_expression (parser);
- }
+ index = cp_parser_expression (parser, NULL, /*cast_p=*/false,
+ /*decltype_p=*/false,
+ /*warn_comma_p=*/warn_comma_subscript);
}
parser->greater_than_is_operator_p = saved_greater_than_is_operator_p;
@@ -9932,12 +9908,13 @@ cp_parser_assignment_operator_opt (cp_pa
CAST_P is true if this expression is the target of a cast.
DECLTYPE_P is true if this expression is the immediate operand of decltype,
except possibly parenthesized or on the RHS of a comma (N3276).
+ WARN_COMMA_P is true if a comma should be diagnosed.
Returns a representation of the expression. */
static cp_expr
cp_parser_expression (cp_parser* parser, cp_id_kind * pidk,
- bool cast_p, bool decltype_p)
+ bool cast_p, bool decltype_p, bool warn_comma_p)
{
cp_expr expression = NULL_TREE;
location_t loc = UNKNOWN_LOCATION;
@@ -9984,6 +9961,17 @@ cp_parser_expression (cp_parser* parser,
break;
/* Consume the `,'. */
loc = cp_lexer_peek_token (parser->lexer)->location;
+ if (warn_comma_p)
+ {
+ /* [depr.comma.subscript]: A comma expression appearing as
+ the expr-or-braced-init-list of a subscripting expression
+ is deprecated. A parenthesized comma expression is not
+ deprecated. */
+ warning_at (loc, OPT_Wcomma_subscript,
+ "top-level comma expression in array subscript "
+ "is deprecated");
+ warn_comma_p = false;
+ }
cp_lexer_consume_token (parser->lexer);
/* A comma operator cannot appear in a constant-expression. */
if (cp_parser_non_integral_constant_expression (parser, NIC_COMMA))
Untested fix prior to any merging of bool flags. Guess that should be done
incrementally if at all, so that the merit can be judged separately.
Wonder about the auto_diagnostic_group d; in your earlier change, isn't
something like that needed only if you call more than one diagnostic routine
and want all of them being treated as a group? In this case there is just one
warning_at, so it makes no sense to me.
The cp_parser_namespace_name use doesn't make sense to me either.
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Subject: [Bug target/91385] Zero-extended negation (*negsi2_1_zext) is not generated
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--- Comment #2 from uros at gcc dot gnu.org ---
Author: uros
Date: Wed Aug 7 18:34:11 2019
New Revision: 274183
URL: https://gcc.gnu.org/viewcvs?rev=274183&root=gcc&view=rev
Log:
PR target/91385
* config/i386/sse.md (*negsi2_1_zext): Simplify insn pattern.
(*negsi2_cmpz_zext): Ditto.
testsuite/ChangeLog:
PR target/91385
* gcc.target/i386/pr91385.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr91385.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.md
trunk/gcc/testsuite/ChangeLog
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
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Subject: [Bug c++/91391] Bogus -Wcomma-subscript
Date: Wed, 07 Aug 2019 19:01:00 -0000
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--- Comment #5 from Stephan Bergmann <sbergman at redhat dot com> ---
(In reply to Stephan Bergmann from comment #0)
[...]
> template-parameter-list, and I wonder whether it should warn about a
> (hypothetical) comma expression in a call to an overloaded operator [] at
> all.
([expr.pre]/2 "Overloaded operators obey the rules for syntax and evaluation
order specified in [expr.compound], but the requirements of operand type and
value category are replaced [...]", so it presumably shall warn there)
>From gcc-bugs-return-650595-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 19:14:51 2019
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Subject: [Bug fortran/91390] treatment of extra parameter in a subroutine call
Date: Wed, 07 Aug 2019 19:14:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-07
CC| |tkoenig at gcc dot gnu.org
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #1 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
The first one, with the two different calls, should be flagged. It does
not do so even with trunk.
Confirmed as an enhancement.
Of course, using modules would catch this.
>From gcc-bugs-return-650596-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 20:15:57 2019
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Subject: [Bug c++/91394] C++ ABI incompatibility (stdexcept)
Date: Wed, 07 Aug 2019 20:15:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to tomas_paukrt from comment #0)
> Some C++ programs cross-compiled with GCC 7.4.0 using -std=gnu++11 do not
> work on a system which have glibc 2.25 cross-compiled with GCC 4.9.4 even if
> the symbol _GLIBCXX_USE_CXX11_ABI was set to zero during cross-compilation.
What has the glibc version got to do with anything?
> A program that calls constructor out_of_range(const char*) will be using
> symbol _ZNSt12out_of_rangeC1EPKc@GLIBCXX_3.4.21 which is not present on the
> old system
If it's not present on the old system that means you're not using the
libstdc++.so from GCC 7.4.0, which you're required to do. You can't compile
with a new GCC and then use an old libstdc++.so at runtime. That's always been
true. Defining _GLIBCXX_USE_CXX11_ABI has nothing to do with that.
>From gcc-bugs-return-650597-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 20:51:18 2019
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From: "vsevolod.livinskij at frtk dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/91178] [9 Regression] Infinite recursion in split_constant_offset in slp after r260289
Date: Wed, 07 Aug 2019 20:51:00 -0000
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--- Comment #15 from Vsevolod Livinskiy <vsevolod.livinskij at frtk dot ru> ---
I don't know if it is the same error or not, but the reproducer looks similar.
It takes about 11 minutes before GCC fails.
Reproducer:
extern int a[][1240092];
int b;
void c() {
for (int d = 2; d <= 9; d++)
for (int e = 32; e <= 41; e++)
b += a[d][5];
}
Error:
>$ gcc -march=skylake-avx512 -c -O3 small.c
gcc: internal compiler error: Segmentation fault signal terminated program cc1
GCC version:
gcc version 10.0.0 (rev. 274155)
>From gcc-bugs-return-650598-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 21:09:34 2019
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Subject: [Bug target/91385] Zero-extended negation (*negsi2_1_zext) is not generated
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Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
Fixed for gcc-10.
>From gcc-bugs-return-650599-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 21:22:33 2019
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Subject: [Bug c++/67533] internal compiler error: in build_call_a, at cp/call.c:372
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--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Wed Aug 7 21:21:57 2019
New Revision: 274200
URL: https://gcc.gnu.org/viewcvs?rev=274200&root=gcc&view=rev
Log:
PR c++/67533
* g++.dg/tls/thread_local-ice5.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/tls/thread_local-ice5.C
Modified:
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-650600-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 21:24:35 2019
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug translation/90117] Replace %<%s%> with %qs
Date: Wed, 07 Aug 2019 21:24:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Yes, it does, and most instances of this warning in GCC code should already be
cleaned up so I think we can resolve this bug as fixed.
$ cat pr90117.c && gcc -S -Wall -Wformat-diag pr90117.c
__attribute__ ((format (gcc_cdiag, 1, 2))) void
cdiag (const char*, ...);
void f (void)
{
cdiag ("%<%s%>", "");
}
pr90117.c: In function ‘f’:
pr90117.c:6:11: warning: quoted ‘%s’ directive in format; use ‘%qs’ instead
[-Wformat-diag]
6 | cdiag ("%<%s%>", "");
| ^~~~~~
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Subject: [Bug c++/67533] internal compiler error: in build_call_a, at cp/call.c:372
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #9 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Test added.
Future improvements: <https://gcc.gnu.org/ml/gcc-patches/2019-06/msg00731.html>
>From gcc-bugs-return-650602-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 21:36:19 2019
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Subject: [Bug c++/85125] constant expression with const_cast UB does not emit error
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85125
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
Status|NEW |ASSIGNED
CC| |mpolacek at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Recently I posted a patch for this:
https://gcc.gnu.org/ml/gcc-patches/2019-07/msg01914.html
With that, the original testcase now gives:
85125.C:6:22: error: non-constant condition for static assertion
6 | static_assert(f()==77, "");
| ~~~^~~~
85125.C:6:20: in ‘constexpr’ expansion of ‘f()’
85125.C:3:27: error: modifying a const object ‘(int&)(& i)’ is not allowed in a
constant expression
3 | const_cast<int&>(i) = 88;
| ~~~~~~~~~~~~~~~~~~~~^~~~
85125.C:2:17: note: originally declared ‘const’ here
2 | int const i = 77;
| ^
and the one from Comment 3 gives:
85125-2.C:12:16: error: non-constant condition for static assertion
12 | static_assert(f());
| ~^~
85125-2.C:12:16: in ‘constexpr’ expansion of ‘f()’
85125-2.C:8:12: error: modifying a const object ‘*(int*)s.S::ptr’ is not
allowed in a constant expression
8 | *s.ptr = 2;
| ~~~~~~~^~~
85125-2.C:7:16: note: originally declared ‘const’ here
7 | auto const s = S{};
| ^
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Subject: [Bug c++/86974] Support Clang's require_constant_initialization attribute
Date: Wed, 07 Aug 2019 21:40:00 -0000
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think this is now "superseded" by PR91360, C++20 constinit.
>From gcc-bugs-return-650605-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 22:02:08 2019
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Subject: [Bug c++/91360] Implement P1143R2: constinit
Date: Wed, 07 Aug 2019 22:02:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |redi at gcc dot gnu.org
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 86974 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-650604-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 22:02:08 2019
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Subject: [Bug c++/86974] Support Clang's require_constant_initialization attribute
Date: Wed, 07 Aug 2019 22:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86974
Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |DUPLICATE
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes it is.
*** This bug has been marked as a duplicate of bug 91360 ***
>From gcc-bugs-return-650606-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 07 22:22:10 2019
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Subject: [Bug fortran/88076] Shared Memory implementation for Coarrays
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kargl at gcc dot gnu.org changed:
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--- Comment #12 from kargl at gcc dot gnu.org ---
Hi Nicolas,
Any progress/update on a shared memory coarray implementation?
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
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--- Comment #14 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Wed Aug 7 22:33:27 2019
New Revision: 274201
URL: https://gcc.gnu.org/viewcvs?rev=274201&root=gcc&view=rev
Log:
2019-08-07 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/91359
* pr91359_2.f: Fix missing hyphen in dg-do
* pr91359_1.f: Ditto. Remove RESULT variable to test actual fix!
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/pr91359_1.f
trunk/gcc/testsuite/gfortran.dg/pr91359_2.f
>From gcc-bugs-return-650608-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 01:03:53 2019
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Subject: [Bug go/86535] FreeBSD/PowerPC64 - Building Go Frontend support for gcc 7.3.0 fails
Date: Thu, 08 Aug 2019 01:03:00 -0000
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--- Comment #22 from Curtis Hamilton <clhamilto at gmail dot com> ---
I've made progress in getting the go frontend to build, but have run into the
following error:
In file included from
/usr/ports/lang/gcc7/work/gcc-7.4.0/libgo/runtime/runtime.h:113:0,
from
/usr/ports/lang/gcc7/work/gcc-7.4.0/libgo/go/reflect/makefunc_ffi_c.c:5:
./runtime.inc:779:17: error: field '_kern' has incomplete type
struct __usem2 _kern;
^~~~~
In file included from
/usr/ports/lang/gcc7/work/gcc-7.4.0/libgo/runtime/runtime.h:113:0,
from
/usr/ports/lang/gcc7/work/gcc-7.4.0/libgo/go/bytes/indexbyte.c:9:
./runtime.inc:779:17: error: field '_kern' has incomplete type
struct __usem2 _kern;
^~~~~
gmake[6]: *** [Makefile:3342: bytes/index.lo] Error 1
gmake[6]: *** Waiting for unfinished jobs....
I can't find any reference to "_kern" elswhere in the code. Can someone help?
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Subject: [Bug lto/91287] LTO disables linking with scalar MASS library (Fortran only)
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--- Comment #34 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com> ---
(In reply to rguenther@suse.de from comment #32)
> On Mon, 5 Aug 2019, luoxhu at cn dot ibm.com wrote:
>
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91287
> >
> > --- Comment #31 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com> ---
> > (In reply to rguenther@suse.de from comment #30)
> > > On Fri, 2 Aug 2019, luoxhu at cn dot ibm.com wrote:
> > >
> > > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91287
> > > >
> > > > --- Comment #28 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com> ---
> > > > (In reply to Richard Biener from comment #24)
> > > > > Btw, this is controlled by symtab_node::output_to_lto_symbol_table_p which
> > > > > has
> > > > >
> > > > > /* FIXME: Builtins corresponding to real functions probably should have
> > > > > symbol table entries. */
> > > > > if (TREE_CODE (decl) == FUNCTION_DECL && fndecl_built_in_p (decl))
> > > > > return false;
> > > > >
> > > > > we could try to do sth like
> > > > >
> > > > > if (TREE_CODE (decl) == FUNCTION_DECL
> > > > > && (fndecl_built_in_p (decl, BUILT_IN_MD)
> > > > > || (fndecl_built_in_p (decl, BUILT_IN_NORMAL)
> > > > > && !associated_internal_fn (decl))))
> > > > > return false;
> > > > >
> > > > > but that would still leave us with too many undefineds I guess
> > > > > (gcc_unreachable for one).
> > > > >
> > > > > We do not currently track builtins that do have a library implementation
> > > > > (whether that it is used in the end is another thing, but less important).
> > > > >
> > > > > What we definitely can do is put a whitelist above like via the following
> > > > > which also catches the case of definitions of builtins.
> > > > >
> > > > > Index: gcc/symtab.c
> > > > > ===================================================================
> > > > > --- gcc/symtab.c (revision 273968)
> > > > > +++ gcc/symtab.c (working copy)
> > > > > @@ -2375,10 +2375,24 @@ symtab_node::output_to_lto_symbol_table_
> > > > > first place. */
> > > > > if (VAR_P (decl) && DECL_HARD_REGISTER (decl))
> > > > > return false;
> > > > > +
> > > > > /* FIXME: Builtins corresponding to real functions probably should have
> > > > > symbol table entries. */
> > > > > - if (TREE_CODE (decl) == FUNCTION_DECL && fndecl_built_in_p (decl))
> > > > > - return false;
> > > > > + if (TREE_CODE (decl) == FUNCTION_DECL
> > > > > + && !definition
> > > > > + && fndecl_built_in_p (decl))
> > > > > + {
> > > > > + if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
> > > > > + switch (DECL_FUNCTION_CODE (decl))
> > > > > + {
> > > > > + CASE_FLT_FN (BUILT_IN_ATAN2):
> > > > > + CASE_FLT_FN (BUILT_IN_SIN):
> > > > > + return true;
> > > > > + default:
> > > > > + break;
> > > > > + }
> > > > > + return false;
> > > > > + }
> > > > >
> > > > > /* We have real symbol that should be in symbol table. However try to
> > > > > trim
> > > > > down the refernces to libraries bit more because linker will otherwise
> > > >
> > > > Hi Richard, no undefineds generated with below code, what's your opinion about
> > > > the updated code, please? Thanks.
> > >
> > > It will break code calling __builtin_unreachable for example since
> > > we'll emit an UNDEF that cannot be satisfied.
> >
> > Thanks. I tried to add __builtin_unreachable() in the test case, it can also
> > works. As BUILT_IN_UNREACHABLE is defined in buitins.def instead of
> > internal-fn.def, so associated_internal_fn will return IFN_LAST for it, then no
> > UNDEF of __builtin_unreachable will be emitted to object file.
> >
> > Most of functions in internal-fn.def are math functions, I am not sure whether
> > you mean the BUILT_IN_NOP or something else?
>
> OK, so a specific example woul dbe __builtin_clz. IIRC the
> DECL_ASSEMBLER_NAME of the functions which have a libgcc fallback is
> _not_ the symbol in libgcc (you'd have to double-check).
>
> That said, using associated_internal_fn is probably mostly safe but
> not a complete fix since we have builtins like __builtin_strcpy
> as well (but of course the C library is always linked).
>
> But I'm fine with an approach that incrementally improves things
> here, but without possibly causing link-failures due to bogus
> UNDEFs
Add x = __builtin_clz(x); and __builtin_strcpy(str, "test\n") to the test code,
the object file's symbol will be:
luoxhu@genoa lto $ ~/workspace/gcc-git/gcc-master_debug/gcc/gcc-nm
-B/home/luoxhu/workspace/gcc-git/gcc-master_debug/gcc/ atan2bashzowie.o
U atan2
U __builtin_clz
00000000 T main
U rand
00000000 T rand_finite_double
00000000 C str
00000000 T zowie
_builtin_clz is also defined in internal-fn.def, it could be linked
successfully with libgcc.
__builtin_strcpy will be lowered to __builtin_memcpy in .008t.lower and linked
successfully with C library. But no UNDEFs for it as associated_internal_fn
return IFN_LAST.
Shall I send a patch to the mail-list using the associated_internal_fn method?
Thanks.
>From gcc-bugs-return-650610-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 01:36:11 2019
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Subject: [Bug c++/78209] Decltype of rvalue reference
Date: Thu, 08 Aug 2019 01:36:00 -0000
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This seems to fix it:
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -27598,6 +27598,8 @@ do_auto_deduction (tree type, tree init, tree
auto_node,
else if (AUTO_IS_DECLTYPE (auto_node))
{
tree stripped_init = tree_strip_any_location_wrapper (init);
+ if (REFERENCE_REF_P (stripped_init))
+ stripped_init = TREE_OPERAND (stripped_init, 0);
bool id = (DECL_P (stripped_init)
|| ((TREE_CODE (init) == COMPONENT_REF
|| TREE_CODE (init) == SCOPE_REF)
(then id is true and decltype deduces the right type).
>From gcc-bugs-return-650611-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 01:37:37 2019
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Subject: [Bug c++/87519] -Wsign-conversion -Wconversion explicit cast fails to silence warning
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Keith Thompson <Keith.S.Thompson at gmail dot com> changed:
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--- Comment #8 from Keith Thompson <Keith.S.Thompson at gmail dot com> ---
Another test case:
#include <cstddef>
int main() {
int i = 42;
size_t s0 = sizeof (int) + (size_t)i;
size_t s1 = sizeof (int) + static_cast<size_t>(i);
}
https://stackoverflow.com/q/57403497/827263
https://stackoverflow.com/a/57404123/827263
>From gcc-bugs-return-650612-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 02:22:45 2019
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #9 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think I have a fix. Will test tomorrow morning.
>From gcc-bugs-return-650613-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 03:03:05 2019
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--- Comment #18 from Kewen Lin <linkw at gcc dot gnu.org> ---
Created attachment 46687
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46687&action=edit
Powerpc case on vector rotation
>From gcc-bugs-return-650614-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 04:07:20 2019
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Subject: [Bug c++/68301] self-dependent reference member initialization not diagnosed
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing Manu due to this being an issue with -Wuninitialized and he's usually
pretty knowledgeable about those
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Subject: [Bug c/37041] [meta-bug] -Wc++-compat refinements
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |meta-bug
Summary|-Wc++-compat refinements |[meta-bug] -Wc++-compat
| |refinements
Alias| |Wc++-compat
--- Comment #9 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Manuel López-Ibáñez from comment #4)
> We should collect individual Wc++-compat issues here.
making it a meta-bug then; alias Wc++-compat
>From gcc-bugs-return-650616-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 04:14:38 2019
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Subject: [Bug c/49702] Undefined static functions resolve to external definitions
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #3)
> Possibly related: bug 19315? (both cases of statics becoming externs; that
> for variables, this for functions)
Update: that has since been fixed by r263556; I haven't checked to see if that
revision fixed this bug too, yet, though...
(cc-ing Iain, who did that revision)
>From gcc-bugs-return-650617-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 04:22:20 2019
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Subject: [Bug c/16804] Function pointer assignment/initialization (-Wc++-compat warning missing from -Wincompatible-pointer-types)
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
Summary|Function pointer |Function pointer
|assignment/initialization |assignment/initialization
|(missing warning) |(-Wc++-compat warning
| |missing from
| |-Wincompatible-pointer-type
| |s)
--- Comment #7 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #6)
> GCC does diagnose the initialization with -Wc++-compat so it seems that
> making this work as suggested is just a matter of including the same warning
> in -Wincompatible-pointer-types:
>
> $ gcc -S -Wc++-compat -xc z.C
> z.C:3:27: warning: pointer target types incompatible in C++ [-Wc++-compat]
> 3 | enum Moo (*Miau) (void) = quack;
> | ^~~~~
>
> Even if enums are strictly compatible with unsigned the mismatch still is
> suggestive of a mistake on the part of the programmer and the warning would
> help detect it.
Retitling to clarify
>From gcc-bugs-return-650618-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 04:27:08 2019
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From: "tomas_paukrt at conel dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91394] C++ ABI incompatibility (stdexcept)
Date: Thu, 08 Aug 2019 04:27:00 -0000
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tomas_paukrt at conel dot cz changed:
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----------------------------------------------------------------------------
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Resolution|INVALID |---
--- Comment #2 from tomas_paukrt at conel dot cz ---
> What has the glibc version got to do with anything?
We have upgraded glibc 2.25 to glibc 2.30 and it introduced similar
compatibility issue, because new symbols (e.g. fcntl64@GLIBC_2.28) were present
in a fresh cross-compiled program, so the binary cannot run on the old system,
but in this case there is a simple workaround (.symver fcntl64,fcntl@GLIBC_2.4)
that makes the program work again, so I was looking for a similar workaround
for libstdc++.so and I have found _GLIBCXX_USE_CXX11_ABI.
> If it's not present on the old system that means you're not using the
> libstdc++.so from GCC 7.4.0, which you're required to do. You can't compile
> with a new GCC and then use an old libstdc++.so at runtime. That's always
> been true. Defining _GLIBCXX_USE_CXX11_ABI has nothing to do with that.
Sorry, but this is not true. If some program is cross-compiled with GCC 7.4.0
using -std=gnu++98 and _GLIBCXX_USE_CXX11_ABI is set to zero then the binary
can be run on the old system with the old libstdc++.so from GCC 4.9.4, because
it does not use any new symbol. Maybe it is a side effect, but it does not
change the fact that it simply works.
Unfortunately _GLIBCXX_USE_CXX11_ABI does not help in case of using
-std=gnu++11, because conditional compilation in some header files ignores
_GLIBCXX_USE_CXX11_ABI and rely only on __cplusplus >= 201103. I have
cross-compiled two programs with patched "stdexcept" and they now run on the
old system too, so I believe that there is a way how to make all binaries
portable.
>From gcc-bugs-return-650619-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 04:39:35 2019
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From: "rbock at eudoxos dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/81429] maybe_unused attribute triggers syntax error when used on first argument to a constructor
Date: Thu, 08 Aug 2019 04:39:00 -0000
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--- Comment #10 from Roland B <rbock at eudoxos dot de> ---
(In reply to Marek Polacek from comment #9)
> Fixed on trunk, will backport to 9.3 later.
Thanks! Much appreciated :-)
>From gcc-bugs-return-650620-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 06:21:05 2019
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From: "ali at pivotal dot io" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/91395] New: Report an uninitialized variable on its initialization statement (setjmp)
Date: Thu, 08 Aug 2019 06:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91395
Bug ID: 91395
Summary: Report an uninitialized variable on its initialization
statement (setjmp)
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: ali at pivotal dot io
Target Milestone: ---
Version:
$ gcc-9 --version
gcc-9 (Ubuntu 9.1.0-2ubuntu2~19.04) 9.1.0
(Actually from gcc 7)
Reproducer:
```
#include <setjmp.h>
extern int other(void);
extern void trigger(int *cond1);
extern sigjmp_buf *global_exception_stack;
void
trigger(int *cond1)
{
while (1)
{
if (*cond1 == 0)
*cond1 = other();
while (*cond1)
{
sigjmp_buf *save_exception_stack =
global_exception_stack;
sigjmp_buf local_sigjmp_buf;
if (sigsetjmp(local_sigjmp_buf, 0) == 0)
global_exception_stack = &local_sigjmp_buf;
else
global_exception_stack = (sigjmp_buf *)
save_exception_stack;
global_exception_stack = (sigjmp_buf *)
save_exception_stack;
}
}
}
```
```
$ gcc-9 -O1 -Werror=uninitialized -fexpensive-optimizations -ftree-pre -c -o
/dev/null reproducer.c
reproducer.c: In function 'trigger':
reproducer.c:17:16: error: 'save_exception_stack' is used uninitialized in this
function [-Werror=uninitialized]
17 | sigjmp_buf *save_exception_stack = global_exception_stack;
| ^~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
```
Observation:
1, asm code re-ordering matters.
2, when it reports warning, initializing asm codes are before the setjmp().
When it warns:
```
sigjmp_buf *save_exception_stack = PG_exception_stack;
2f: 48 8b 1d 00 00 00 00 mov 0x0(%rip),%rbx # 36
<trigger+0x36>
36: 48 89 5c 24 18 mov %rbx,0x18(%rsp)
sigjmp_buf local_sigjmp_buf;
if (sigsetjmp(local_sigjmp_buf, 0) == 0)
```
When it doesn't complain:
```
sigjmp_buf *save_exception_stack = PG_exception_stack;
sigjmp_buf local_sigjmp_buf;
if (sigsetjmp(local_sigjmp_buf, 0) == 0)
29: 48 8d 44 24 20 lea 0x20(%rsp),%rax
2e: 48 89 44 24 08 mov %rax,0x8(%rsp)
...
sigjmp_buf *save_exception_stack = PG_exception_stack;
3c: 48 8b 1d 00 00 00 00 mov 0x0(%rip),%rbx # 43
<trigger+0x43>
43: 48 89 5c 24 18 mov %rbx,0x18(%rsp)
```
I guess it might be an optimization regression of gcc, it was always smart
enough to reorder the local variables to avoid this issue (initializing them
after setjmp() obviously has no such issue because it will be initialized as we
wish after longjmp() wherever anyway), but higher version gcc's updates lost
the optimization in some cases.
>From gcc-bugs-return-650621-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 06:59:17 2019
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Subject: [Bug libstdc++/90415] [9/10 Regression] std::is_copy_constructible<std::tuple<std::any>> is incomplete
Date: Thu, 08 Aug 2019 06:59:00 -0000
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Lei YU <mine260309 at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |mine260309 at gmail dot com
--- Comment #6 from Lei YU <mine260309 at gmail dot com> ---
This issue prevents using std::any with gmock, which I need it for the unit
tests to pass the build.
There are related SO questions:
*
https://stackoverflow.com/questions/57332965/incomplete-type-for-stdany-when-gmocking-interface
*
https://stackoverflow.com/questions/57387245/using-stdany-with-gmock-result-in-different-behavior-on-gcc-79
@Jonathan Wakely Is there a quick fix for this? I would like to test it.
>From gcc-bugs-return-650622-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:15:02 2019
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Subject: [Bug c++/91334] [10 Regression] ICE in propagate_necessity at gcc/tree-ssa-dce.c:813 since r273791
Date: Thu, 08 Aug 2019 07:15:00 -0000
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--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #9)
> [hjl@gnu-mic-1 build_base_lto.0000]$
> /export/gnu/import/git/gcc-test-spec-lto/usr/bin/g++ -S -DSPEC_CPU -DNDEBUG
> -DAPP_NO_THREADS -DXALAN_INMEM_MSG_LOADER -I. -Ixercesc -Ixercesc/dom
> -Ixercesc/dom/impl -Ixercesc/sax -Ixercesc/util/MsgLoaders/InMemory
> -Ixercesc/util/Transcoders/Iconv -Ixalanc/include -DPROJ_XMLPARSER
> -DPROJ_XMLUTIL -DPROJ_PARSERS -DPROJ_SAX4C -DPROJ_SAX2 -DPROJ_DOM
> -DPROJ_VALIDATORS -DXML_USE_NATIVE_TRANSCODER -DXML_USE_INMEM_MESSAGELOADER
> -O2 -DSPEC_CPU_LP64 -DSPEC_CPU_LINUX XPath.cpp -ffast-math
> In file included from ./XPathDefinitions.hpp:21,
> from XPath.hpp:22,
> from XPath.cpp:18:
> XPath.cpp: In member function ‘void
> xalanc_1_8::XPath::executeMore(xalanc_1_8::XalanNode*,
> xalanc_1_8::XPath::OpCodeMapPositionType,
> xalanc_1_8::XPathExecutionContext&, xalanc_1_8::FormatterListener&,
> xalanc_1_8::XPath::MemberFunctionPtr) const’:
> ./PlatformDefinitions.hpp:66:35: internal compiler error: Segmentation fault
> 66 | #define XALAN_CPP_NAMESPACE_END }
> | ^
> XPath.cpp:5696:1: note: in expansion of macro ‘XALAN_CPP_NAMESPACE_END’
> 5696 | XALAN_CPP_NAMESPACE_END
> | ^~~~~~~~~~~~~~~~~~~~~~~
> 0xfbcc0f crash_signal
> ../../src-trunk/gcc/toplev.c:326
> 0xb26b73 lookup_page_table_entry
> ../../src-trunk/gcc/ggc-page.c:632
> 0xb26b73 ggc_set_mark(void const*)
> ../../src-trunk/gcc/ggc-page.c:1531
> 0xd6a781 gt_ggc_mx_symtab_node(void*)
> /export/gnu/import/git/gcc-test-spec-lto/bld/gcc/gtype-desc.c:1302
> 0xee51fd gt_ggc_ma_order
> ./gt-passes.h:31
> 0xee51fd gt_ggc_ma_order
> ./gt-passes.h:26
> 0xcf6995 ggc_mark_root_tab
> ../../src-trunk/gcc/ggc-common.c:77
> 0xcf6b9c ggc_mark_roots()
> ../../src-trunk/gcc/ggc-common.c:94
> 0xb274f5 ggc_collect()
> ../../src-trunk/gcc/ggc-page.c:2201
> Please submit a full bug report,
> with preprocessed source if appropriate.
> Please include the complete backtrace with any bug report.
> See <https://gcc.gnu.org/bugs/> for instructions.
> [hjl@gnu-mic-1 build_base_lto.0000]$
>
> -O2 -ffast-math is needed to trigger ICE.
Hm, I can't reproduce that. How have you configured the compiler?
>From gcc-bugs-return-650623-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:16:00 2019
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/91395] Report an uninitialized variable on its initialization statement (setjmp)
Date: Thu, 08 Aug 2019 07:16:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The warning is correct due to the way sigsetjmp works.
You need to mark save_exception_stack as volatile to fix the issue.
Basically any non-volatile variable in the function scope can be incorrect.
This is what the POSIX (and C standard for setjmp) says. GCC is just taking
into account this now.
>From gcc-bugs-return-650624-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:18:44 2019
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Subject: [Bug lto/91393] lto1: internal compiler error: decompressed stream: Destination buffer is too small
Date: Thu, 08 Aug 2019 07:18:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Can you please provide the objects files so that I can reproduce it?
Which GCC version do you use?
>From gcc-bugs-return-650625-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:21:34 2019
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Subject: [Bug c/91392] g++: internal compiler error: Aborted (program cc1plus)
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Note that GCC 6 is out of support. Please try a newer release.
>From gcc-bugs-return-650626-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:36:14 2019
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Subject: [Bug sanitizer/91389] [7/8/9/10 Regression] error: control reaches end of non-void function with -fsanitize=thread since r219201
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 46688
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46688&action=edit
Original test-case
I'm fine with the approach to remove a dead code. However, I can't easily find
what to change in the original source file. The warning location does not help
much.
>From gcc-bugs-return-650627-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:37:49 2019
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Subject: [Bug libgcc/91379] internal compiler error __gcov_fork
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Clinton Bunch from comment #2)
> As I stated, I've tried to compile 4.9.4, 5.3.0, 5.5.0, 6.1.0, 6.5.0 and
> 8.3.0 I get the same error on all of them. I reported on 9.1.0 as it is the
> current version. I can't get a gcc more recent than 4.9.2 to even attempt a
> build and none of these versions will compile with the HP C/C++ compiler.
Then the only option is to build host compiler with -O0. That can be done with:
make all-host -k CFLAGS="-O0 -g" CXXFLAGS="-O0 -g"
then you'll be hopefully able to build runtime libraries.
>From gcc-bugs-return-650628-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:46:19 2019
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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--- Comment #18 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Richard Earnshaw from comment #17)
> Created attachment 46686 [details]
> candidate patch
>
> Could you try this patch please? So far only very lightly tested.
Sure, I'll test the problematic package build with your patch.
>From gcc-bugs-return-650629-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:48:54 2019
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Subject: [Bug middle-end/91395] Report an uninitialized variable on its initialization statement (setjmp)
Date: Thu, 08 Aug 2019 07:48:00 -0000
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--- Comment #2 from Adam <ali at pivotal dot io> ---
I got the point "The local variables that do not have the volatile type and
have been changed between the setjmp() invocation and longjmp() call are
indeterminate"
But save_exception_stack is not changed between the setjmp() invocation and
longjmp() call, it is defined every time. Still looks expected?
>From gcc-bugs-return-650630-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:51:04 2019
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Subject: [Bug bootstrap/91352] [10 Regression] Jobserver detection uses fcntl, which is not available on mingw-w64
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Aug 8 07:50:28 2019
New Revision: 274208
URL: https://gcc.gnu.org/viewcvs?rev=274208&root=gcc&view=rev
Log:
Fix file descriptor existence of MinGW.
2019-08-08 Martin Liska <mliska@suse.cz>
PR bootstrap/91352
* gcc.c (driver::detect_jobserver): Use is_valid_fd.
* lto-wrapper.c (jobserver_active_p): Likewise.
2019-08-08 Martin Liska <mliska@suse.cz>
PR bootstrap/91352
* libiberty.h (is_valid_fd): New function.
2019-08-08 Martin Liska <mliska@suse.cz>
PR bootstrap/91352
* lrealpath.c (is_valid_fd): New function.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gcc.c
trunk/gcc/lto-wrapper.c
trunk/include/ChangeLog
trunk/include/libiberty.h
trunk/libiberty/ChangeLog
trunk/libiberty/lrealpath.c
>From gcc-bugs-return-650631-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:52:30 2019
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Subject: [Bug sanitizer/91389] [7/8/9/10 Regression] error: control reaches end of non-void function with -fsanitize=thread since r219201
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I see dead code everywhere in the function, they must have some weirdo macro
for cases that wraps everything in case something { ... } break;
Many of those break; statements are dead code.
>From gcc-bugs-return-650632-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:55:28 2019
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Subject: [Bug sanitizer/91389] [7/8/9/10 Regression] error: control reaches end of non-void function with -fsanitize=thread since r219201
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> I see dead code everywhere in the function, they must have some weirdo macro
> for cases that wraps everything in case something { ... } break;
Is the 'break;' really dead in such situation (when you don't have a return or
another break within the {} block)?
> Many of those break; statements are dead code.
>From gcc-bugs-return-650633-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:57:36 2019
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Subject: [Bug libstdc++/90415] [9/10 Regression] std::is_copy_constructible<std::tuple<std::any>> is incomplete
Date: Thu, 08 Aug 2019 07:57:00 -0000
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--- Comment #7 from Lei YU <mine260309 at gmail dot com> ---
Additional information.
std::experimental::fundamentals_v1::any has no problem, so the below code
compiles fine.
```
#include <experimental/any>
#include <tuple>
#include <type_traits>
bool is_copy_constructible_tuple_any() {
return
std::is_copy_constructible<std::tuple<std::experimental::any>>::value;
}
```
>From gcc-bugs-return-650634-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 07:58:06 2019
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Subject: [Bug middle-end/91395] Report an uninitialized variable on its initialization statement (setjmp)
Date: Thu, 08 Aug 2019 07:58:00 -0000
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
In theory other can cause a call to longjmp but gcc does not know it cannot.
>From gcc-bugs-return-650635-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 08:27:43 2019
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Subject: [Bug lto/91287] LTO disables linking with scalar MASS library (Fortran only)
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
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CC| |rsandifo at gcc dot gnu.org
--- Comment #35 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
I might be missing the point, but tying this decision to internal
functions seems conceptually wrong. The main distinguishing
feature of internal functions is that they're purely compiler-
internal and have no linkage. It seems odd to use them to decide
whether a built-in function actually does have linkage. ;-)
E.g. we only really have an internal function for things like
atan2 because of (the rarely used?) -mfancy-math-387. We should
be free to remove the internal function if we ever drop the
associated 387 support.
>From gcc-bugs-return-650636-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 08:27:56 2019
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Subject: [Bug sanitizer/91389] [7/8/9/10 Regression] error: control reaches end of non-void function with -fsanitize=thread since r219201
Date: Thu, 08 Aug 2019 08:27:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #4)
> (In reply to Jakub Jelinek from comment #3)
> > I see dead code everywhere in the function, they must have some weirdo macro
> > for cases that wraps everything in case something { ... } break;
>
> Is the 'break;' really dead in such situation (when you don't have a return
> or another break within the {} block)?
>
> > Many of those break; statements are dead code.
It is dead when you do have an unconditional return in there. As I said in the
other PR, we try hard to do a good job with block_may_fallthru and
gimple_seq_may_fallthru, but it can't handle everything, feel free to improve
those. And all -fsanitize=thread does is it adds a cleanup code, the same
thing as you get if you have an automatic variable with a destructor.
*** This bug has been marked as a duplicate of bug 86899 ***
>From gcc-bugs-return-650637-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 08:27:56 2019
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Subject: [Bug sanitizer/86899] [8/9/10 regression] TSAN incorrect warning: control reaches end of non-void function
Date: Thu, 08 Aug 2019 08:27:00 -0000
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
*** Bug 91389 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-650638-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 08:28:58 2019
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Subject: [Bug sanitizer/91389] [7/8/9/10 Regression] error: control reaches end of non-void function with -fsanitize=thread since r219201
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #5)
> (In reply to Martin Liška from comment #4)
> > (In reply to Jakub Jelinek from comment #3)
> > > I see dead code everywhere in the function, they must have some weirdo macro
> > > for cases that wraps everything in case something { ... } break;
> >
> > Is the 'break;' really dead in such situation (when you don't have a return
> > or another break within the {} block)?
> >
> > > Many of those break; statements are dead code.
>
> It is dead when you do have an unconditional return in there. As I said in
> the other PR, we try hard to do a good job with block_may_fallthru and
> gimple_seq_may_fallthru, but it can't handle everything, feel free to
> improve those. And all -fsanitize=thread does is it adds a cleanup code,
> the same thing as you get if you have an automatic variable with a
> destructor.
>
> *** This bug has been marked as a duplicate of bug 86899 ***
Sure, thank you for your time.
>From gcc-bugs-return-650639-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 08:30:42 2019
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Subject: [Bug sanitizer/91389] [7/8/9/10 Regression] error: control reaches end of non-void function with -fsanitize=thread since r219201
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Forgot to say, if you are just looking for a workaround for the warning (note,
-O2 -Wreturn-type doesn't warn, in this case you need also no optimizations),
then I'd just move the return from the default: clause to after the switch if
the package maintainers insist on their weird coding conventions.
>From gcc-bugs-return-650640-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 08:40:03 2019
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Subject: [Bug rtl-optimization/66087] Invalid narrowing of MEM with containing POST_INC
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--- Comment #4 from Mikael Pettersson <mikpelinux at gmail dot com> ---
Still miscompiled by gcc-10.0, 9.1, and 8.3 at -O1 and above.
>From gcc-bugs-return-650641-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 08:45:58 2019
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Subject: [Bug bootstrap/91352] [10 Regression] Jobserver detection uses fcntl, which is not available on mingw-w64
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed now.
>From gcc-bugs-return-650642-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 08:56:36 2019
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From: "ali at pivotal dot io" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/91395] Report an uninitialized variable on its initialization statement (setjmp)
Date: Thu, 08 Aug 2019 08:56:00 -0000
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--- Comment #4 from Adam <ali at pivotal dot io> ---
(In reply to Andrew Pinski from comment #3)
> In theory other can cause a call to longjmp but gcc does not know it cannot.
Thanks for the quick reply.
I got the longjmp() part, it could be called anytime. The part I don't get is
why it reports since gcc could tell that no one changes the
save_exception_stack (it has a certain short life).
The POSIX's statement as I know has two facts: "a local not-volatile variable"
and "it's been changed between setjmp() and longjmp()". Have I missed anything?
>From gcc-bugs-return-650643-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 09:18:19 2019
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
Date: Thu, 08 Aug 2019 09:18:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |10.0, 9.1.0
--- Comment #19 from Martin Liška <marxin at gcc dot gnu.org> ---
Good I can confirm the patch works for the package!
>From gcc-bugs-return-650644-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 09:30:48 2019
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From: "harry.onslow at emenda dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/91392] g++: internal compiler error: Aborted (program cc1plus)
Date: Thu, 08 Aug 2019 09:30:00 -0000
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--- Comment #2 from Harry Onslow <harry.onslow at emenda dot com> ---
Hi Martin,
Thanks for the message. I will try a newer version - Could you please advise on
where I can download the latest release please?
Regards,
Harry
>From gcc-bugs-return-650645-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 09:31:52 2019
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/91287] LTO disables linking with scalar MASS library (Fortran only)
Date: Thu, 08 Aug 2019 09:31:00 -0000
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--- Comment #36 from rguenther at suse dot de <rguenther at suse dot de> ---
On August 8, 2019 10:27:38 AM GMT+02:00, "rsandifo at gcc dot gnu.org"
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91287
>
>rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
>
> What |Removed |Added
>----------------------------------------------------------------------------
> CC| |rsandifo at gcc dot gnu.org
>
>--- Comment #35 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot
>gnu.org> ---
>I might be missing the point, but tying this decision to internal
>functions seems conceptually wrong. The main distinguishing
>feature of internal functions is that they're purely compiler-
>internal and have no linkage. It seems odd to use them to decide
>whether a built-in function actually does have linkage. ;-)
Yes indeed. Fact is we do not have the information whether a builtin has
linkage or not readily available.
>E.g. we only really have an internal function for things like
>atan2 because of (the rarely used?) -mfancy-math-387. We should
>be free to remove the internal function if we ever drop the
>associated 387 support.
>From gcc-bugs-return-650646-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 09:32:53 2019
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/91287] LTO disables linking with scalar MASS library (Fortran only)
Date: Thu, 08 Aug 2019 09:32:00 -0000
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--- Comment #37 from rguenther at suse dot de <rguenther at suse dot de> ---
On August 8, 2019 3:35:26 AM GMT+02:00, "luoxhu at cn dot ibm.com"
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91287
>
>--- Comment #34 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com> ---
>(In reply to rguenther@suse.de from comment #32)
>> On Mon, 5 Aug 2019, luoxhu at cn dot ibm.com wrote:
>>
>> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91287
>> >
>> > --- Comment #31 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com> ---
>> > (In reply to rguenther@suse.de from comment #30)
>> > > On Fri, 2 Aug 2019, luoxhu at cn dot ibm.com wrote:
>> > >
>> > > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91287
>> > > >
>> > > > --- Comment #28 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com>
>---
>> > > > (In reply to Richard Biener from comment #24)
>> > > > > Btw, this is controlled by
>symtab_node::output_to_lto_symbol_table_p which
>> > > > > has
>> > > > >
>> > > > > /* FIXME: Builtins corresponding to real functions probably
>should have
>> > > > > symbol table entries. */
>> > > > > if (TREE_CODE (decl) == FUNCTION_DECL && fndecl_built_in_p
>(decl))
>> > > > > return false;
>> > > > >
>> > > > > we could try to do sth like
>> > > > >
>> > > > > if (TREE_CODE (decl) == FUNCTION_DECL
>> > > > > && (fndecl_built_in_p (decl, BUILT_IN_MD)
>> > > > > || (fndecl_built_in_p (decl, BUILT_IN_NORMAL)
>> > > > > && !associated_internal_fn (decl))))
>> > > > > return false;
>> > > > >
>> > > > > but that would still leave us with too many undefineds I
>guess
>> > > > > (gcc_unreachable for one).
>> > > > >
>> > > > > We do not currently track builtins that do have a library
>implementation
>> > > > > (whether that it is used in the end is another thing, but
>less important).
>> > > > >
>> > > > > What we definitely can do is put a whitelist above like via
>the following
>> > > > > which also catches the case of definitions of builtins.
>> > > > >
>> > > > > Index: gcc/symtab.c
>> > > > >
>===================================================================
>> > > > > --- gcc/symtab.c (revision 273968)
>> > > > > +++ gcc/symtab.c (working copy)
>> > > > > @@ -2375,10 +2375,24 @@
>symtab_node::output_to_lto_symbol_table_
>> > > > > first place. */
>> > > > > if (VAR_P (decl) && DECL_HARD_REGISTER (decl))
>> > > > > return false;
>> > > > > +
>> > > > > /* FIXME: Builtins corresponding to real functions
>probably should have
>> > > > > symbol table entries. */
>> > > > > - if (TREE_CODE (decl) == FUNCTION_DECL && fndecl_built_in_p
>(decl))
>> > > > > - return false;
>> > > > > + if (TREE_CODE (decl) == FUNCTION_DECL
>> > > > > + && !definition
>> > > > > + && fndecl_built_in_p (decl))
>> > > > > + {
>> > > > > + if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
>> > > > > + switch (DECL_FUNCTION_CODE (decl))
>> > > > > + {
>> > > > > + CASE_FLT_FN (BUILT_IN_ATAN2):
>> > > > > + CASE_FLT_FN (BUILT_IN_SIN):
>> > > > > + return true;
>> > > > > + default:
>> > > > > + break;
>> > > > > + }
>> > > > > + return false;
>> > > > > + }
>> > > > >
>> > > > > /* We have real symbol that should be in symbol table.
>However try to
>> > > > > trim
>> > > > > down the refernces to libraries bit more because linker
>will otherwise
>> > > >
>> > > > Hi Richard, no undefineds generated with below code, what's
>your opinion about
>> > > > the updated code, please? Thanks.
>> > >
>> > > It will break code calling __builtin_unreachable for example
>since
>> > > we'll emit an UNDEF that cannot be satisfied.
>> >
>> > Thanks. I tried to add __builtin_unreachable() in the test case, it
>can also
>> > works. As BUILT_IN_UNREACHABLE is defined in buitins.def instead of
>> > internal-fn.def, so associated_internal_fn will return IFN_LAST for
>it, then no
>> > UNDEF of __builtin_unreachable will be emitted to object file.
>> >
>> > Most of functions in internal-fn.def are math functions, I am not
>sure whether
>> > you mean the BUILT_IN_NOP or something else?
>>
>> OK, so a specific example woul dbe __builtin_clz. IIRC the
>> DECL_ASSEMBLER_NAME of the functions which have a libgcc fallback is
>> _not_ the symbol in libgcc (you'd have to double-check).
>>
>> That said, using associated_internal_fn is probably mostly safe but
>> not a complete fix since we have builtins like __builtin_strcpy
>> as well (but of course the C library is always linked).
>>
>> But I'm fine with an approach that incrementally improves things
>> here, but without possibly causing link-failures due to bogus
>> UNDEFs
>
>Add x = __builtin_clz(x); and __builtin_strcpy(str, "test\n") to the
>test code,
>the object file's symbol will be:
>luoxhu@genoa lto $ ~/workspace/gcc-git/gcc-master_debug/gcc/gcc-nm
>-B/home/luoxhu/workspace/gcc-git/gcc-master_debug/gcc/ atan2bashzowie.o
> U atan2
> U __builtin_clz
That shows the bug. The builtin may have an implementation in libgcc but not
with this symbol. Thus an LTO link would fail.
>00000000 T main
> U rand
>00000000 T rand_finite_double
>00000000 C str
>00000000 T zowie
>
>_builtin_clz is also defined in internal-fn.def, it could be linked
>successfully with libgcc.
>__builtin_strcpy will be lowered to __builtin_memcpy in .008t.lower and
>linked
>successfully with C library. But no UNDEFs for it as
>associated_internal_fn
>return IFN_LAST.
>Shall I send a patch to the mail-list using the associated_internal_fn
>method?
>Thanks.
>From gcc-bugs-return-650647-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 10:04:00 2019
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/91392] g++: internal compiler error: Aborted (program cc1plus)
Date: Thu, 08 Aug 2019 10:04:00 -0000
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
I would try any of these:
https://mingw-w64.org/doku.php/download
>From gcc-bugs-return-650648-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 10:20:07 2019
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From: "niva at niisi dot msk.ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug driver/91396] New: Link error when I use -fvtable-verify=std and -static
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91396
Bug ID: 91396
Summary: Link error when I use -fvtable-verify=std and -static
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: niva at niisi dot msk.ru
Target Milestone: ---
I have built gcc-7.4.0 with --enable-vtable-verify for x86_64 under Fedora 27:
$HOME/src/gcc-7.4.0/configure --srcdir=$HOME/src/gcc-7.4.0 --verbose
--enable-vtable-verify --enable-languages=c,c++,fortran --enable-lto
--prefix=$HOME/local-gcc
When I run:
$ ~/local-gcc/bin/g++ -fvtable-verify=std -O2 -static t.C -o t.exe
the following error occurs:
~/local-gcc/lib/gcc/x86_64-pc-linux-gnu/7.4.0/vtv_end.o: In function
`__VLTprotect':
vtv_end.c:(.text.startup+0x0): multiple definition of `__VLTprotect'
~/local-gcc/lib/gcc/x86_64-pc-linux-gnu/7.4.0/../../../../lib64/libvtv.a(vtv_end.o):~/build/native-gcc/x86_64-pc-linux-gnu/libvtv/vtv_end.c:59:
first defined here
$ cat t.C
int main () {return 0;}
I have fixed the problem by deleting vtv_end.o from
~/local-gcc/lib64/libvtv.a but I'm not sure it's OK.
>From gcc-bugs-return-650649-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 10:36:11 2019
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Subject: [Bug c++/91397] New: -Wstringop-overflow specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807
Date: Thu, 08 Aug 2019 10:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91397
Bug ID: 91397
Summary: -Wstringop-overflow specified bound
18446744073709551615 exceeds maximum object size
9223372036854775807
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
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Hi,
We saw this coming only with GCC 10 (probably different inlining decisions),
but the reduced test case also triggers with 9, so I'm going to file it against
9.1.0.
This test case is reduced from MySQL 8.0 (osfile0.cc):
#include <string.h>
#include <stdlib.h>
char *allocate(unsigned long g) {
if (g == 0) return (char *)malloc(0);
for (;;)
;
}
char *i;
char *j(long k) {
char *l(allocate(k + 1));
memcpy(l, i, k);
return l;
}
atum17:~> g++-9 -O2 -Wstringop-overflow -c os0file.cc
os0file.cc: In function ‘char* j(long int)’:
os0file.cc:12:9: warning: ‘void* memcpy(void*, const void*, size_t)’ specified
bound 18446744073709551615 exceeds maximum object size 9223372036854775807
[-Wstringop-overflow=]
12 | memcpy(l, i, k);
| ~~~~~~^~~~~~~~~
I don't even understand what the warning means (“specified bound†of what?),
but it looks spurious to me. Perhaps some signed/unsigned confusion?
Since the reduction is somewhat nonsensical with the empty infinite loop in
there, I'm also including an unreduced test case. With GCC 9.1.0 and -O2, it
gives the same warning.
>From gcc-bugs-return-650650-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 10:37:21 2019
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Subject: [Bug c++/91397] -Wstringop-overflow specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807
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--- Comment #1 from Steinar H. Gunderson <steinar+gcc at gunderson dot no> ---
Created attachment 46689
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46689&action=edit
Unreduced test case
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Subject: [Bug libstdc++/90415] [9/10 Regression] std::is_copy_constructible<std::tuple<std::any>> is incomplete
Date: Thu, 08 Aug 2019 11:17:00 -0000
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--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Lei YU from comment #6)
> @Jonathan Wakely Is there a quick fix for this? I would like to test it.
If I had a fix I would have committed it.
>From gcc-bugs-return-650652-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 11:30:45 2019
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Subject: [Bug c++/91397] -Wstringop-overflow specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807
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--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
if (g == 0) return (char *)malloc(0);
for (;;)
;
so the only way this can return is if g is 0. This means that in j, k is -1,
and you are calling memcpy with a huge argument. So at least in the reduced
testcase, the warning makes some sense.
>From gcc-bugs-return-650653-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 11:35:33 2019
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Subject: [Bug c++/91397] -Wstringop-overflow specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807
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--- Comment #3 from Steinar H. Gunderson <steinar+gcc at gunderson dot no> ---
Yes, the reduced one is awkward. Thus the unreduced one :-)
>From gcc-bugs-return-650654-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 12:10:49 2019
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Subject: [Bug c++/91397] -Wstringop-overflow specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807
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--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
I guess it happens in some dead path that gcc doesn't know is dead. At some
point, you look at last_slash-path+1. Here there is a branch on whether this
number is 0, and if it is 0, nonsense happens (writing 0 at address -1, this
huge memcpy, etc). Maybe you know that last_slash is always >= path (so this
weird code path is dead) and gcc doesn't?
>From gcc-bugs-return-650655-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 12:19:38 2019
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Subject: [Bug c++/90313] [7/8/9/10 Regression] Is an assignment elided with gcc7.3 -O2?
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|needs-bisection |
CC| |marxin at gcc dot gnu.org,
| |rsandifo at gcc dot gnu.org
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r242668.
@Richard S. Can you please take a look?
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Subject: [Bug target/91306] [MSP430] libgcc/crtstuff.c: Alignment of frame_dummy .init_array entry is too big
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--- Comment #4 from Jozef Lawrynowicz <jozefl.gcc at gmail dot com> ---
Should I submit a patch which changes uses of sizeof in alignment attributes to
__alignof__? Or are you working on it?
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Subject: [Bug c++/91397] -Wstringop-overflow specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807
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--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
mem_strdupl calls allocate(len+1). If len+1 is 0, you proceed to write to
s[len] i.e. 0[-1]. I think gcc would be happier if you handled this special
case explicitly (you could error, trap, just assume it cannot happen
(__builtin_unreachable), whatever).
This type of warning can easily give false positives if your code is written
with invariants in mind that are not visible enough to the compiler.
If you had been writing to address 0, gcc would have detected that as a trap,
but it doesn't do anything special for -1.
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Subject: [Bug target/91052] [10 Regression] ICE in fix_reg_equiv_init, at ira.c:2705
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|needs-bisection |
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-08
CC| |linkw at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Known to work| |9.1.0
Ever confirmed|0 |1
Known to fail| |10.0
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r272731.
>From gcc-bugs-return-650659-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 12:42:08 2019
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Subject: [Bug c++/91397] -Wstringop-overflow specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807
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--- Comment #6 from Steinar H. Gunderson <steinar+gcc at gunderson dot no> ---
So basically GCC is worried that I might be calling allocate() with -1 bytes,
and gives a warning?
last_slash presumably has to be >= path, given that it comes out of strrchr().
But maybe GCC won't know that.
>From gcc-bugs-return-650660-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 13:01:22 2019
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From: "niva at niisi dot msk.ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug driver/91396] Link error when I use -fvtable-verify=std and -static
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niva at niisi dot msk.ru changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|unknown |7.4.0
--- Comment #1 from niva at niisi dot msk.ru ---
I've also noticed that small programs (tests) built with "vtable-verify
enabled" gcc work slower than programs built with default gcc (even when the
-fvtable-verify option is not used). This slowdown mostly concerns dynamically
linked programs.
>From gcc-bugs-return-650661-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 13:07:12 2019
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Subject: [Bug middle-end/91358] Wrong code with dynamic allocation and optional like class
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--- Comment #6 from Antony Polukhin <antoshkka at gmail dot com> ---
(In reply to Michael Matz from comment #3)
> I don't really see any, no good idea here :-/
How about moving all the optimizations based on reading uninitialized values
under a flag like -funinitialized-logic, so that users could build with -O2
-fno-uninitialized-logic ?
>From gcc-bugs-return-650662-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 13:20:30 2019
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Subject: [Bug tree-optimization/91178] [9 Regression] Infinite recursion in split_constant_offset in slp after r260289
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--- Comment #16 from Serge Belyshev <belyshev at depni dot sinp.msu.ru> ---
(In reply to Vsevolod Livinskiy from comment #15)
> I don't know if it is the same error or not, but the reproducer looks
> similar.
This one is different. It does not fail for me with -O3 -march=skylake-avx512,
just slow and consumes over 1G of memory.
But with just "-O3" it blows up the stack during predictive commoning pass via
follow_ssa_edge tree-scalar-evolution.c:1350 --> follow_ssa_edge_in_rhs
tree-scalar-evolution.c:1135 --> follow_ssa_edge_binary
tree-scalar-evolution.c:947 --> follow_ssa_edge tree-scalar-evolution.c:1350
recursion.
Git bisect points at r256634.
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Subject: [Bug c++/91397] -Wstringop-overflow specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807
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--- Comment #7 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Steinar H. Gunderson from comment #6)
> So basically GCC is worried that I might be calling allocate() with -1
> bytes, and gives a warning?
Yes, although it might not always give the warning, depends on various
heuristics.
> last_slash presumably has to be >= path, given that it comes out of
> strrchr().
It doesn't directly, there is a lot of last_slash-- with various conditions.
>From gcc-bugs-return-650664-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 13:47:39 2019
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Subject: [Bug middle-end/91358] Wrong code with dynamic allocation and optional like class
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--- Comment #7 from Michael Matz <matz at gcc dot gnu.org> ---
(In reply to Antony Polukhin from comment #6)
> (In reply to Michael Matz from comment #3)
> > I don't really see any, no good idea here :-/
>
> How about moving all the optimizations based on reading uninitialized values
> under a flag like -funinitialized-logic, so that users could build with -O2
> -fno-uninitialized-logic ?
That can't work in general. How would you propose that GCC automagically
detects that in:
struct S {int a, b;};
int foo (struct S *s) { return s->a ? s->b : 0; }
the read of ->b is uninitialized? After all, it might have been initialized
by the caller or not.
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Subject: [Bug c++/91397] -Wstringop-overflow specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807
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--- Comment #8 from Steinar H. Gunderson <steinar+gcc at gunderson dot no> ---
But all of those conditions include last_slash > path.
I tried adding this just before the mem_strdupl() call:
if (last_slash < path) {
ib::fatal() << "Logic error.";
__builtin_unreachable();
}
and the warning still triggers.
>From gcc-bugs-return-650666-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 14:02:58 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91397] -Wstringop-overflow specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807
Date: Thu, 08 Aug 2019 14:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91397
--- Comment #9 from Steinar H. Gunderson <steinar+gcc at gunderson dot no> ---
Putting this at the start of mem_strdupl() suppresses the warning:
if (len + 1 == 0) __builtin_unreachable();
This seemingly also does:
if (static_cast<long>(len) < 0) __builtin_unreachable();
So somehow, even though it knows that path >= last_slash (from before), it
doesn't know that last_slash - path >= 0. I don't know how easy or hard this is
to infer.
>From gcc-bugs-return-650667-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 14:20:59 2019
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Subject: [Bug c/91398] New: Possible missed optimization: Can a pointer be passed as hidden pointer in x86-64 System V ABI
Date: Thu, 08 Aug 2019 14:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91398
Bug ID: 91398
Summary: Possible missed optimization: Can a pointer be passed
as hidden pointer in x86-64 System V ABI
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For the following example:
struct Vec3{
double x, y, z;
};
struct Vec3 do_something(void);
void use(struct Vec3 *restrict out){
*out = do_something();
}
The resulting assembly (-O2) is:
use:
pushq %rbx
movq %rdi, %rbx
subq $32, %rsp
movq %rsp, %rdi
call do_something
movdqu (%rsp), %xmm0
movq 16(%rsp), %rax
movups %xmm0, (%rbx)
movq %rax, 16(%rbx)
addq $32, %rsp
popq %rbx
ret
Here on godbolt: https://godbolt.org/z/kUPFox
However, as out is restrict, it could be passed as hidden pointer to
do_something, which would lead to the following assembler:
use:
jmp do_something ; %rdi is now the hidden pointer
So is it a missed optimization, or is there something in x86-64 System V ABI
that would forbid the above?
>From gcc-bugs-return-650668-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 14:37:26 2019
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From: "ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
Date: Thu, 08 Aug 2019 14:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91376
--- Comment #8 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
> (In reply to Martin Liška from comment #6)
>> Good, then let me take a look.
>
> So I've just tested current master of binutils and I can see:
>
> marxin@marxinbox:/tmp> gcc --version
> gcc (GCC) 10.0.0 20190806 (experimental)
> Copyright (C) 2019 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> marxin@marxinbox:/tmp> gcc -c -flto main.c
>
> $ nm main.o
> nm: main.o: plugin needed to handle lto object
> 0000000000000001 C __gnu_lto_slim
>
> The issue here is that the installed nm can't load plugin from bfd-plugins:
>
> $ strace -f -s512 nm main.o 2>&1 | grep plugin
> openat(AT_FDCWD, "/home/marxin/bin/binutils/bin/../bin/../lib/bfd-plugins",
> O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 4
> stat("/home/marxin/bin/binutils/bin/../bin/../lib/bfd-plugins/..",
> {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
> stat("/home/marxin/bin/binutils/bin/../bin/../lib/bfd-plugins/.",
> {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
> write(2, "main.o: plugin needed to handle lto object", 42main.o: plugin needed
> to handle lto object) = 42
>
> $ nm --plugin /dev/shm/objdir/lto-plugin/.libs/liblto_plugin.so.0.0.0 main.o
> 00000000 T main
>
> So the question is if you have a LTO plugin accessible for the built gold or
> nm?
I don't see how nm would come into play here. For one, I've only
installed gas and gld from binutils trunk under non-standard names
(gas-2.32.51 and gld-2.32.51) and use them via --with-as and --with-ld.
The failing testcases boils down to (run in gcc/testsuite/g++):
#!/bin/sh
COLLECT_GCC=../../xg++ \
COLLECT_GCC_OPTIONS= \
COLLECT_LTO_WRAPPER=../../lto-wrapper \
COMPILER_PATH=../.. \
\
/vol/gcc/bin/gld-2.32.51 \
-plugin ../../liblto_plugin.so \
-plugin-opt=../../lto-wrapper \
-plugin-opt=-fresolution=cp_lto_pr90990_0.res \
-plugin-opt=-v \
-plugin-opt=-save-temps \
-o g++-dg-lto-pr90990-01.exe -r cp_lto_pr90990_0.o
$ gld.cmd
../../lto-wrapper -fresolution=cp_lto_pr90990_0.res -flinker-output=rel
cp_lto_pr90990_0.o
/vol/gcc/bin/gld-2.32.51: /var/tmp//ccKkavFd.lto.o: plugin needed to handle lto
object
[Leaving g++-dg-lto-pr90990-01.exe.lto_wrapper_args]
[Leaving /var/tmp//ccKkavFd.lto.o]
When I run this under truss (Solaris equivalent of strace), I find just
the following calls to execve:
12815: execve("../../lto-wrapper", 0xFEFFD6F4, 0xFEFFD844) argc = 2
12815: argv: ../../lto-wrapper
12815: @g++-dg-lto-pr90990-01.exe.lto_wrapper_args
12817: execve("../../xg++", 0xFEFFD5A4, 0xFEFFD990) argc = 2
12817: argv: ../../xg++ @/var/tmp//ccxh7UCb
12819: execve("../../lto1", 0x08189FD0, 0x08187784) argc = 19
12819: argv: ../../lto1 -quiet -dumpbase cp_lto_pr90990_0.o
12819: -mtune=generic -march=pentium4 -auxbase-strip
12819: /var/tmp//ccKkavFd.lto.o -O0 -fno-openmp -fno-openacc
12819: -fno-pie -fno-diagnostics-show-caret
12819: -fno-diagnostics-show-line-numbers
12819: -fresolution=cp_lto_pr90990_0.res -flinker-output=rel
12819: @/var/tmp//ccsvXE.b -o /var/tmp//ccM632hc.s
12821: execve("/vol/gcc/bin/gas-2.32.51", 0x08189FD0, 0x08187784) argc = 7
12821: argv: /vol/gcc/bin/gas-2.32.51 -Qy -s --32 -o
12821: /var/tmp//ccKkavFd.lto.o /var/tmp//ccM632hc.s
There's no nm anywhere in sight. Besides, I find it very strange that
out of hundreds if not thousends of LTO tests during this bootstrap,
only a single one shows this error. If there were a fundamental
problem, I'd expect a way larger number here.
>From gcc-bugs-return-650669-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 14:52:52 2019
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Subject: [Bug c++/87519] -Wsign-conversion -Wconversion explicit cast fails to silence warning
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
--- Comment #10 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Tested fine:
https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00553.html
>From gcc-bugs-return-650670-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 14:56:20 2019
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/91399] New: parse_mtune_ctrl_str shouldn't use ix86_tune_ctrl_string
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91399
Bug ID: 91399
Summary: parse_mtune_ctrl_str shouldn't use
ix86_tune_ctrl_string
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: ubizjak at gmail dot com
Target Milestone: ---
Target: i386
There are
static void
parse_mtune_ctrl_str (bool dump)
{
if (!ix86_tune_ctrl_string)
return;
parse_mtune_ctrl_str is only called from set_ix86_tune_features, which
is only called from ix86_function_specific_restore and
ix86_option_override_internal. parse_mtune_ctrl_str shouldn't use
ix86_tune_ctrl_string which is defined with global_options. Instead,
opts should be passed to parse_mtune_ctrl_str:
diff --git a/gcc/config/i386/i386-options.c b/gcc/config/i386/i386-options.c
index 8e7c9c8363a2..b9d526ecc9d5 100644
--- a/gcc/config/i386/i386-options.c
+++ b/gcc/config/i386/i386-options.c
@@ -655,7 +655,8 @@ ix86_option_override_internal (bool main_args_p,
struct gcc_options *opts,
struct gcc_options *opts_set);
static void
-set_ix86_tune_features (enum processor_type ix86_tune, bool dump);
+set_ix86_tune_features (struct gcc_options *opts,
+ enum processor_type ix86_tune, bool dump);
/* Restore the current options */
@@ -730,7 +731,7 @@ ix86_function_specific_restore (struct gcc_options *opts,
/* Recreate the tune optimization tests */
if (old_tune != ix86_tune)
- set_ix86_tune_features (ix86_tune, false);
+ set_ix86_tune_features (opts, ix86_tune, false);
}
/* Adjust target options after streaming them in. This is mainly about
@@ -1458,13 +1464,13 @@ ix86_parse_stringop_strategy_string (char
*strategy_str, bool is_memset)
print the features that are explicitly set. */
static void
-parse_mtune_ctrl_str (bool dump)
+parse_mtune_ctrl_str (struct gcc_options *opts, bool dump)
{
- if (!ix86_tune_ctrl_string)
+ if (!opts->x_ix86_tune_ctrl_string)
return;
char *next_feature_string = NULL;
- char *curr_feature_string = xstrdup (ix86_tune_ctrl_string);
+ char *curr_feature_string = xstrdup (opts->x_ix86_tune_ctrl_string);
char *orig = curr_feature_string;
int i;
do
@@ -1503,7 +1509,8 @@ parse_mtune_ctrl_str (bool dump)
processor type. */
static void
-set_ix86_tune_features (enum processor_type ix86_tune, bool dump)
+set_ix86_tune_features (struct gcc_options *opts,
+ enum processor_type ix86_tune, bool dump)
{
unsigned HOST_WIDE_INT ix86_tune_mask = HOST_WIDE_INT_1U << ix86_tune;
int i;
@@ -1525,7 +1532,7 @@ set_ix86_tune_features (enum processor_type ix86_tune,
bool dump)
ix86_tune_features[i] ? "on" : "off");
}
- parse_mtune_ctrl_str (dump);
+ parse_mtune_ctrl_str (opts, dump);
}
@@ -2230,7 +2237,7 @@ ix86_option_override_internal (bool main_args_p,
XDELETEVEC (s);
}
- set_ix86_tune_features (ix86_tune, opts->x_ix86_dump_tunes);
+ set_ix86_tune_features (opts, ix86_tune, opts->x_ix86_dump_tunes);
#ifndef USE_IX86_FRAME_POINTER
#define USE_IX86_FRAME_POINTER 0
>From gcc-bugs-return-650671-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 15:37:23 2019
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Subject: [Bug tree-optimization/91400] New: __builtin_cpu_supports conjunction is optimized poorly
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Clang 8 optimizes both f() and g() to the same code:
bool f()
{
return __builtin_cpu_supports("popcnt") && __builtin_cpu_supports("ssse3");
}
bool g()
{
extern unsigned int cpu_model;
return (cpu_model & 64) && (cpu_model & 4);
}
f()/g():
mov eax, dword ptr [rip + cpu_model]
and eax, 68
cmp eax, 68
sete al
ret
GCC generates this code only for g(). For f() GCC generates less optimal:
f():
mov edx, DWORD PTR __cpu_model[rip+12]
mov eax, edx
shr eax, 6
and eax, 1
and edx, 4
mov edx, 0
cmove eax, edx
ret
I believe it would be great if GCC is able to generate the same code for f()
too.
>From gcc-bugs-return-650672-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 15:38:22 2019
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Subject: [Bug c++/87519] -Wsign-conversion -Wconversion explicit cast fails to silence warning
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--- Comment #11 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Thu Aug 8 15:37:46 2019
New Revision: 274211
URL: https://gcc.gnu.org/viewcvs?rev=274211&root=gcc&view=rev
Log:
PR c++/87519 - bogus warning with -Wsign-conversion.
* typeck.c (cp_build_binary_op): Use same_type_p instead of comparing
the types directly.
* g++.dg/warn/Wsign-conversion-5.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/warn/Wsign-conversion-5.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/typeck.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/87519] -Wsign-conversion -Wconversion explicit cast fails to silence warning
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--- Comment #12 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed on trunk, will backport to 9.3 later.
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Subject: [Bug c/91401] schedule + dist_schedule clauses rejected on distribute parallel for
Date: Thu, 08 Aug 2019 15:43:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Ever confirmed|0 |1
>From gcc-bugs-return-650674-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 15:43:24 2019
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Subject: [Bug c/91401] New: schedule + dist_schedule clauses rejected on distribute parallel for
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91401
Bug ID: 91401
Summary: schedule + dist_schedule clauses rejected on
distribute parallel for
Product: gcc
Version: 9.1.1
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void
foo (void)
{
int i;
#pragma omp distribute parallel for schedule (static) dist_schedule (static)
for (i = 0; i < 64; i++)
;
}
is incorrectly rejected due to a typo.
>From gcc-bugs-return-650676-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 16:09:30 2019
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Subject: [Bug c++/91334] [10 Regression] ICE in propagate_necessity at gcc/tree-ssa-dce.c:813 since r273791
Date: Thu, 08 Aug 2019 16:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91334
--- Comment #11 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Martin Liška from comment #10)
> (In reply to H.J. Lu from comment #9)
> > [hjl@gnu-mic-1 build_base_lto.0000]$
> > /export/gnu/import/git/gcc-test-spec-lto/usr/bin/g++ -S -DSPEC_CPU -DNDEBUG
> > -DAPP_NO_THREADS -DXALAN_INMEM_MSG_LOADER -I. -Ixercesc -Ixercesc/dom
> > -Ixercesc/dom/impl -Ixercesc/sax -Ixercesc/util/MsgLoaders/InMemory
> > -Ixercesc/util/Transcoders/Iconv -Ixalanc/include -DPROJ_XMLPARSER
> > -DPROJ_XMLUTIL -DPROJ_PARSERS -DPROJ_SAX4C -DPROJ_SAX2 -DPROJ_DOM
> > -DPROJ_VALIDATORS -DXML_USE_NATIVE_TRANSCODER -DXML_USE_INMEM_MESSAGELOADER
> > -O2 -DSPEC_CPU_LP64 -DSPEC_CPU_LINUX XPath.cpp -ffast-math
> > In file included from ./XPathDefinitions.hpp:21,
> > from XPath.hpp:22,
> > from XPath.cpp:18:
> > XPath.cpp: In member function ‘void
> > xalanc_1_8::XPath::executeMore(xalanc_1_8::XalanNode*,
> > xalanc_1_8::XPath::OpCodeMapPositionType,
> > xalanc_1_8::XPathExecutionContext&, xalanc_1_8::FormatterListener&,
> > xalanc_1_8::XPath::MemberFunctionPtr) const’:
> > ./PlatformDefinitions.hpp:66:35: internal compiler error: Segmentation fault
> > 66 | #define XALAN_CPP_NAMESPACE_END }
> > | ^
> > XPath.cpp:5696:1: note: in expansion of macro ‘XALAN_CPP_NAMESPACE_END’
> > 5696 | XALAN_CPP_NAMESPACE_END
> > | ^~~~~~~~~~~~~~~~~~~~~~~
> > 0xfbcc0f crash_signal
> > ../../src-trunk/gcc/toplev.c:326
> > 0xb26b73 lookup_page_table_entry
> > ../../src-trunk/gcc/ggc-page.c:632
> > 0xb26b73 ggc_set_mark(void const*)
> > ../../src-trunk/gcc/ggc-page.c:1531
> > 0xd6a781 gt_ggc_mx_symtab_node(void*)
> > /export/gnu/import/git/gcc-test-spec-lto/bld/gcc/gtype-desc.c:1302
> > 0xee51fd gt_ggc_ma_order
> > ./gt-passes.h:31
> > 0xee51fd gt_ggc_ma_order
> > ./gt-passes.h:26
> > 0xcf6995 ggc_mark_root_tab
> > ../../src-trunk/gcc/ggc-common.c:77
> > 0xcf6b9c ggc_mark_roots()
> > ../../src-trunk/gcc/ggc-common.c:94
> > 0xb274f5 ggc_collect()
> > ../../src-trunk/gcc/ggc-page.c:2201
> > Please submit a full bug report,
> > with preprocessed source if appropriate.
> > Please include the complete backtrace with any bug report.
> > See <https://gcc.gnu.org/bugs/> for instructions.
> > [hjl@gnu-mic-1 build_base_lto.0000]$
> >
> > -O2 -ffast-math is needed to trigger ICE.
>
> Hm, I can't reproduce that. How have you configured the compiler?
I used:
--enable-clocale=gnu --with-system-zlib --enable-shared --enable-cet
--with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran,lto
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Subject: [Bug driver/91396] Link error when I use -fvtable-verify=std and -static
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |link-failure
CC| |cmtice at google dot com,
| |egallager at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing libvtv maintainer
>From gcc-bugs-return-650678-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 16:19:10 2019
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/63391] Erroneous -Wsign-conversion with offsetof
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |mpolacek at gcc dot gnu.org
Resolution|--- |FIXED
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed now by r274211.
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rsandifo at gcc dot gnu.org
--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Mine.
>From gcc-bugs-return-650680-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 16:39:13 2019
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/91227] pointer relational expression not folded but equivalent inequality is
Date: Thu, 08 Aug 2019 16:39:00 -0000
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--- Comment #18 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I don't expect people to do such comparisons with addresses of local
variables directly. It is plausible that they have a memmove-like
function, and once it gets inlined the compiler can see that, at a
particular call site, it's doing such comparisons involving addresses of
local variables. The question then is whether this might result in
problems if e.g. the comparisons say two arrays are both before and after
each other and the memmove-like function isn't prepared for that. And,
then, whether we say that's OK and such a function needs to cast to
uintptr_t as the way to make something that's valid in
C-with-ABI-boundaries into something that works in GNU C in the presence
of (possibly LTO) inlining.
>From gcc-bugs-return-650681-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 16:44:08 2019
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Subject: [Bug c++/80061] error on constexpr function with an unevaluated throw
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Comment 1 compiles fine since r264171.
>From gcc-bugs-return-650683-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 16:46:34 2019
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Subject: [Bug c++/81930] [meta-bug] Issues with -Weffc++
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Bug 81930 depends on bug 57854, which changed state.
Bug 57854 Summary: Would like to have a warning for virtual overrides without C++11 "override" keyword
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57854
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>From gcc-bugs-return-650682-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 16:46:33 2019
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Subject: [Bug c++/57854] Would like to have a warning for virtual overrides without C++11 "override" keyword
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
-Wsuggest-override is already present, closing.
>From gcc-bugs-return-650684-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 16:50:18 2019
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Subject: [Bug middle-end/91395] Report an uninitialized variable on its initialization statement (setjmp)
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--- Comment #5 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
It's *accessible objects* whose value on second return from setjmp is the
same as when longjmp is called (unless non-volatile, automatic storage
duration and changed between setjmp and longjmp). The point is that when
longjmp is called, save_exception_stack may not be an accessible object
(because of having gone out of scope), so has no defined value, so it's
just like goto jumping into the block where save_exception_stack is
declared and thus bypassing its initialization - it's valid to jump into
the scope like that (unless jumping into the scope of a declaration with
variably modified type), but the variable is uninitialized.
>From gcc-bugs-return-650685-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 17:02:27 2019
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Subject: [Bug c/91398] Possible missed optimization: Can a pointer be passed as hidden pointer in x86-64 System V ABI
Date: Thu, 08 Aug 2019 17:02:00 -0000
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--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
ABI question: is a function that returns a value through such a hidden
pointer required not to write anything to the storage pointed to until it
knows that it will definitely be returning normally (rather than e.g.
through longjmp)? The ABI document seems silent on this matter. This
optimization is only valid if there is such a requirement, since *out in
the example given must not be written if the function returns through
longjmp.
>From gcc-bugs-return-650686-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 17:06:28 2019
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Subject: [Bug c++/88102] Implement P0542R5, C++20 contracts
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Since contracts were pulled out of C++20, I'm closing this PR.
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Subject: [Bug c++/88323] implement C++20 language features.
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Bug 88323 depends on bug 88102, which changed state.
Bug 88102 Summary: Implement P0542R5, C++20 contracts
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88102
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88323
Bug 88323 depends on bug 88330, which changed state.
Bug 88330 Summary: Implement P0542R5, P1289R1, C++20 contract based programming.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88330
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
>From gcc-bugs-return-650688-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 17:28:42 2019
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Subject: [Bug c++/88330] Implement P0542R5, P1289R1, C++20 contract based programming.
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Since contracts were pulled out of C++20, I'm closing this PR.
>From gcc-bugs-return-650690-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 17:50:36 2019
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Subject: [Bug c++/79520] Spurious caching for constexpr arguments
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed by r255788. Probably it's worth to add the new test.
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From: "andrewdkaster at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91402] New: PowerPC unecessary -Wignored-attriubte warnings on template specialization with -mlongcall
Date: Thu, 08 Aug 2019 17:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91402
Bug ID: 91402
Summary: PowerPC unecessary -Wignored-attriubte warnings on
template specialization with -mlongcall
Product: gcc
Version: 7.4.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: andrewdkaster at gmail dot com
Target Milestone: ---
Host: x86_64-linux-gnu
Target: powerpc-linux-gnu
Build: x86_64-linux-gnu
Created attachment 46690
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46690&action=edit
Reproducer
When using the option -mlongcall for powerpc, g++ appears to treat my template
parameter for my template specialization as a function declaration and add the
longcall attribute, which then is later ignored and generates a warning.
~: powerpc-linux-gnu-g++ -mlongcall -Wall -Wextra -c test.cpp -o test.o
test.cpp:5:15: warning: ignoring attributes on template argument ‘R(A)’
[-Wignored-attributes]
struct S <R(A)> {};
^
test.cpp:11:18: warning: ignoring attributes on template argument ‘Ret(Arg)’
[-Wignored-attributes]
struct D<Ret(Arg)> {
^
I am using this class to wrap a generic delegate, per the second example.
Tested on Ubuntu 18.04.03, powerpc-linux-gnu-g++ version 7.4.0
~: powerpc-linux-gnu-g++ -v
Using built-in specs.
COLLECT_GCC=powerpc-linux-gnu-g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc-cross/powerpc-linux-gnu/7/lto-wrapper
Target: powerpc-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
7.4.0-1ubuntu1~18.04.1' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-7 --enable-shared
--enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm
--disable-libquadmath --disable-libquadmath-support --enable-plugin
--with-system-zlib --enable-secureplt --disable-softfloat --with-cpu=default32
--disable-softfloat --enable-targets=powerpc-linux,powerpc64-linux
--enable-multiarch --disable-werror --with-long-double-128 --enable-multilib
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=powerpc-linux-gnu --program-prefix=powerpc-linux-gnu-
--includedir=/usr/powerpc-linux-gnu/include
Thread model: posix
gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
The same results happen when using a version of g++ 8.1 obtained from WindRiver
to target PowerPC VxWorks (running on Rhel-7):
./powerpc-linux-gnu-g++ -v
Reading specs from
/opt/workbench4-r2/compilers/gnu-8.1.0.1/x86_64-linux2/bin/../lib/gcc/powerpc-linux-gnu/8.1.0/../../../../powerpc-linux-gnu/lib/specs
COLLECT_GCC=./powerpc-linux-gnu-g++
COLLECT_LTO_WRAPPER=/opt/workbench4-r2/compilers/gnu-8.1.0.1/x86_64-linux2/bin/../libexec/gcc/powerpc-linux-gnu/8.1.0/lto-wrapper
Target: powerpc-linux-gnu
Configured with:
/folk/prj-llvm-build/gcc/build-storage/master/20190313_161647/wr-gcc/gcc/configure
--target=powerpc-linux-gnu --prefix=/usr/local/wind/tmp/compilers
--with-pkgversion='Wind River VxWorks GCC 8.1.0.1 - 2019.03.13' --disable-nls
--enable-languages=c,c++ --enable-targets=all --disable-multilib
--enable-threads --enable-tls --enable-__cxa_atexit --enable-secureplt
Thread model: posix
gcc version 8.1.0 (Wind River VxWorks GCC 8.1.0.1 - 2019.03.13)
>From gcc-bugs-return-650692-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 17:55:33 2019
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Subject: [Bug c++/79520] Spurious caching for constexpr arguments
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Thu Aug 8 17:54:58 2019
New Revision: 274214
URL: https://gcc.gnu.org/viewcvs?rev=274214&root=gcc&view=rev
Log:
PR c++/79520
* g++.dg/cpp1y/constexpr-79520.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp1y/constexpr-79520.C
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/79520] Spurious caching for constexpr arguments
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Done.
>From gcc-bugs-return-650694-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 18:14:50 2019
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Subject: [Bug go/86535] FreeBSD/PowerPC64 - Building Go Frontend support for gcc 7.3.0 fails
Date: Thu, 08 Aug 2019 18:14:00 -0000
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--- Comment #23 from Ian Lance Taylor <ian at airs dot com> ---
Look for _kern in runtime.inc. See what struct it is part of. The struct is
likely defined in the generated file runtime_sysinfo.go. You may need to
modify libgo/mkrsysinfo.sh to not add that struct to runtime_sysinfo.go, or you
may need to modify mkrsysinfo.sh to define __usem2.
>From gcc-bugs-return-650695-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 18:15:40 2019
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From: "vsevolod.livinskij at frtk dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/91178] [9 Regression] Infinite recursion in split_constant_offset in slp after r260289
Date: Thu, 08 Aug 2019 18:15:00 -0000
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--- Comment #17 from Vsevolod Livinskiy <vsevolod.livinskij at frtk dot ru> ---
(In reply to Serge Belyshev from comment #16)
> (In reply to Vsevolod Livinskiy from comment #15)
> > I don't know if it is the same error or not, but the reproducer looks
> > similar.
>
> This one is different. It does not fail for me with -O3
> -march=skylake-avx512, just slow and consumes over 1G of memory.
>
> But with just "-O3" it blows up the stack during predictive commoning pass
> via follow_ssa_edge tree-scalar-evolution.c:1350 --> follow_ssa_edge_in_rhs
> tree-scalar-evolution.c:1135 --> follow_ssa_edge_binary
> tree-scalar-evolution.c:947 --> follow_ssa_edge tree-scalar-evolution.c:1350
> recursion.
>
> Git bisect points at r256634.
Thank you! I'll open a new bug to keep them separated.
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Subject: [Bug tree-optimization/91403] New: GCC fails with ICE.
Date: Thu, 08 Aug 2019 18:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91403
Bug ID: 91403
Summary: GCC fails with ICE.
Product: gcc
Version: tree-ssa
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: vsevolod.livinskij at frtk dot ru
Target Milestone: ---
GCC fails with an internal compiler error. Sometimes the compilation takes
about 12 minutes before it fails. Originally the bug was reported in r91178.
Reproducer:
extern int a[][1240092];
int b;
void c() {
for (int d = 2; d <= 9; d++)
for (int e = 32; e <= 41; e++)
b += a[d][5];
}
Error:
>$ gcc -march=skylake-avx512 -c -O3 small.c
gcc: internal compiler error: Segmentation fault signal terminated program cc1
GCC version:
gcc version 10.0.0 (rev. 274155)
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From: "andrewdkaster at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91402] PowerPC unecessary -Wignored-attriubte warnings on template specialization with -mlongcall
Date: Thu, 08 Aug 2019 18:29:00 -0000
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--- Comment #1 from Andrew Kaster <andrewdkaster at gmail dot com> ---
As a note, I was able to reproduce using godbolt, but they don't have very
recent versions of gcc for powerpc:
https://godbolt.org/z/20lNhf
Of the available compilers:
No warnings:
power64le clang (trunk)
powerpc64 clang (trunk)
PowerPC gcc 4.8.5
Warnings:
power64 AT 12.0
power64le AT 12.0
power64le gcc 6.3.0
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91334] [10 Regression] ICE in propagate_necessity at gcc/tree-ssa-dce.c:813 since r273791
Date: Thu, 08 Aug 2019 18:31:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |FIXED
--- Comment #12 from H.J. Lu <hjl.tools at gmail dot com> ---
I opened PR 91404.
>From gcc-bugs-return-650698-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 18:31:06 2019
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Subject: [Bug ipa/91404] New: [10 Regression] internal compiler error: Segmentation fault
Date: Thu, 08 Aug 2019 18:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91404
Bug ID: 91404
Summary: [10 Regression] internal compiler error: Segmentation
fault
Product: gcc
Version: 10.0
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On x86-64, when building 483.xalancbmk in SPEC CPU 2006, r273857 caused:
$ gcc -S -DSPEC_CPU -DNDEBUG -DAPP_NO_THREADS -DXALAN_INMEM_MSG_LOADER -I.
-Ixercesc -Ixercesc/dom -Ixercesc/dom/impl -Ixercesc/sax
-Ixercesc/util/MsgLoaders/InMemory -Ixercesc/util/Transcoders/Iconv
-Ixalanc/include -DPROJ_XMLPARSER -DPROJ_XMLUTIL -DPROJ_PARSERS -DPROJ_SAX4C
-DPROJ_SAX2 -DPROJ_DOM -DPROJ_VALIDATORS -DXML_USE_NATIVE_TRANSCODER
-DXML_USE_INMEM_MESSAGELOADER -O2 -DSPEC_CPU_LP64 -DSPEC_CPU_LINUX
XPath.cpp -ffast-math
./PlatformDefinitions.hpp:66:35: internal compiler error: Segmentation fault
66 | #define XALAN_CPP_NAMESPACE_END }
| ^
0xfbc09f crash_signal
../../src-trunk/gcc/toplev.c:326
0xb26383 lookup_page_table_entry
../../src-trunk/gcc/ggc-page.c:632
0xb26383 ggc_set_mark(void const*)
../../src-trunk/gcc/ggc-page.c:1531
0xd69c41 gt_ggc_mx_symtab_node(void*)
/export/gnu/import/git/gcc-test-spec-lto/bld/gcc/gtype-desc.c:1302
0xee468d gt_ggc_ma_order
./gt-passes.h:31
0xee468d gt_ggc_ma_order
./gt-passes.h:26
0xcf6115 ggc_mark_root_tab
../../src-trunk/gcc/ggc-common.c:77
0xcf631c ggc_mark_roots()
../../src-trunk/gcc/ggc-common.c:94
0xb26d05 ggc_collect()
../../src-trunk/gcc/ggc-page.c:2201
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
It doesn't fail with pre-processed file.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/91403] GCC fails with ICE.
Date: Thu, 08 Aug 2019 18:32:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Doesn't ICE for me, but SLP during vectorization goes wild, for very short
*.ifcvt
<bb 2> [local count: 12199019]:
b_lsm.4_24 = b;
<bb 3> [local count: 97603136]:
# d_69 = PHI <2(2), d_9(5)>
# b_lsm.4_17 = PHI <b_lsm.4_24(2), _79(5)>
# ivtmp_76 = PHI <8(2), ivtmp_73(5)>
_14 = a[d_69][5];
_16 = _14 + b_lsm.4_17;
_23 = _14 + _16;
_30 = _14 + _23;
_37 = _14 + _30;
_44 = _14 + _37;
_51 = _14 + _44;
_58 = _14 + _51;
_65 = _14 + _58;
_72 = _14 + _65;
_79 = _14 + _72;
d_9 = d_69 + 1;
ivtmp_73 = ivtmp_76 - 1;
if (ivtmp_73 != 0)
goto <bb 5>; [87.50%]
else
goto <bb 4>; [12.50%]
<bb 5> [local count: 85404116]:
goto <bb 3>; [100.00%]
<bb 4> [local count: 12199019]:
# _80 = PHI <_79(3)>
b = _80;
return;
it creates a *.vect dump with 1860297 lines, with:
vect__14.10_5 = MEM <vector(8) int> [(int *)vectp_a.8_7];
vectp_a.8_4 = vectp_a.8_7 + 32;
vect__14.11_3 = MEM <vector(8) int> [(int *)vectp_a.8_4];
vectp_a.8_2 = vectp_a.8_4 + 32;
vect__14.12_1 = MEM <vector(8) int> [(int *)vectp_a.8_2];
vectp_a.8_10 = vectp_a.8_2 + 32;
vect__14.13_15 = MEM <vector(8) int> [(int *)vectp_a.8_10];
vectp_a.8_31 = vectp_a.8_10 + 32;
...
where there are 620046 those MEM loads that nothing consumes and 620046
additions of 32.
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From: "belyshev at depni dot sinp.msu.ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/91403] GCC fails with ICE.
Date: Thu, 08 Aug 2019 18:53:00 -0000
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Serge Belyshev <belyshev at depni dot sinp.msu.ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |belyshev at depni dot sinp.msu.ru
--- Comment #2 from Serge Belyshev <belyshev at depni dot sinp.msu.ru> ---
Crashes here in predcom:
Program received signal SIGSEGV, Segmentation fault.
...
(gdb) bt -100
...
#662173 0x00000000012f7c09 in follow_ssa_edge (loop=0x7ffff78cd000,
def=0x7fffd8be5160, halting_phi=0x7ffff78d4200,
evolution_of_loop=0x7fffffffdf00, limit=0) at
../../gcc/gcc/tree-scalar-evolution.c:1350
#662174 0x00000000012f6f22 in follow_ssa_edge_binary (loop=0x7ffff78cd000,
at_stmt=0x7fffd8be51b8, type=0x7ffff78c31f8, rhs0=0x7fffd8be6120,
code=POINTER_PLUS_EXPR, rhs1=0x7ffff7775d38, halting_phi=0x7ffff78d4200,
evolution_of_loop=0x7fffffffdf00, limit=0) at
../../gcc/gcc/tree-scalar-evolution.c:947
#662175 0x00000000012f769e in follow_ssa_edge_in_rhs (loop=0x7ffff78cd000,
stmt=0x7fffd8be51b8, halting_phi=0x7ffff78d4200,
evolution_of_loop=0x7fffffffdf00, limit=0) at
../../gcc/gcc/tree-scalar-evolution.c:1135
#662176 0x00000000012f7c09 in follow_ssa_edge (loop=0x7ffff78cd000,
def=0x7fffd8be51b8, halting_phi=0x7ffff78d4200,
evolution_of_loop=0x7fffffffdf00, limit=0) at
../../gcc/gcc/tree-scalar-evolution.c:1350
#662177 0x00000000012f6f22 in follow_ssa_edge_binary (loop=0x7ffff78cd000,
at_stmt=0x7ffff78ccf20, type=0x7ffff78c31f8, rhs0=0x7fffd8be61b0,
code=POINTER_PLUS_EXPR, rhs1=0x7ffff7775d38, halting_phi=0x7ffff78d4200,
evolution_of_loop=0x7fffffffdf00, limit=0) at
../../gcc/gcc/tree-scalar-evolution.c:947
#662178 0x00000000012f769e in follow_ssa_edge_in_rhs (loop=0x7ffff78cd000,
stmt=0x7ffff78ccf20, halting_phi=0x7ffff78d4200,
evolution_of_loop=0x7fffffffdf00, limit=0) at
../../gcc/gcc/tree-scalar-evolution.c:1135
#662179 0x00000000012f7c09 in follow_ssa_edge (loop=0x7ffff78cd000,
def=0x7ffff78ccf20, halting_phi=0x7ffff78d4200,
evolution_of_loop=0x7fffffffdf00, limit=0) at
../../gcc/gcc/tree-scalar-evolution.c:1350
#662180 0x00000000012f812d in analyze_evolution_in_loop
(loop_phi_node=0x7ffff78d4200, init_cond=0x7ffff78ce0d8) at
../../gcc/gcc/tree-scalar-evolution.c:1467
#662181 0x00000000012f864d in interpret_loop_phi (loop=0x7ffff78cd000,
loop_phi_node=0x7ffff78d4200) at ../../gcc/gcc/tree-scalar-evolution.c:1630
#662182 0x00000000012fa1bd in analyze_scalar_evolution_1 (loop=0x7ffff78cd000,
var=0x7ffff777fee8) at ../../gcc/gcc/tree-scalar-evolution.c:2044
#662183 0x00000000012fa393 in analyze_scalar_evolution (loop=0x7ffff78cd000,
var=0x7ffff777fee8) at ../../gcc/gcc/tree-scalar-evolution.c:2108
#662184 0x00000000012fa49e in analyze_scalar_evolution_in_loop
(wrto_loop=0x7ffff78cd000, use_loop=0x7ffff78cd000, version=0x7ffff777fee8,
folded_casts=0x7fffffffe0df) at ../../gcc/gcc/tree-scalar-evolution.c:2210
#662185 0x00000000012fd082 in simple_iv_with_niters (wrto_loop=0x7ffff78cd000,
use_loop=0x7ffff78cd000, op=0x7ffff777fee8, iv=0x7fffffffe280, iv_niters=0x0,
allow_nonconstant_step=true) at ../../gcc/gcc/tree-scalar-evolution.c:3288
#662186 0x00000000012fd8e0 in simple_iv (wrto_loop=0x7ffff78cd000,
use_loop=0x7ffff78cd000, op=0x7ffff777fee8, iv=0x7fffffffe280,
allow_nonconstant_step=true) at ../../gcc/gcc/tree-scalar-evolution.c:3413
#662187 0x000000000207e0ef in dr_analyze_innermost (drb=0x3166a50,
ref=0x7ffff78e11b8, loop=0x7ffff78cd000, stmt=0x7ffff78d8dc0) at
../../gcc/gcc/tree-data-ref.c:950
#662188 0x000000000207f342 in create_data_ref (nest=0x7ffff78d0f00,
loop=0x7ffff78cd000, memref=0x7ffff78e11b8, stmt=0x7ffff78d8dc0, is_read=true,
is_conditional_in_stmt=false) at ../../gcc/gcc/tree-data-ref.c:1255
#662189 0x0000000002089d1c in find_data_references_in_stmt
(nest=0x7ffff78cd000, stmt=0x7ffff78d8dc0, datarefs=0x7fffffffe7f8) at
../../gcc/gcc/tree-data-ref.c:5149
#662190 0x0000000002089f0e in find_data_references_in_bb (loop=0x7ffff78cd000,
bb=0x7ffff78da410, datarefs=0x7fffffffe7f8) at
../../gcc/gcc/tree-data-ref.c:5203
#662191 0x0000000002089fce in find_data_references_in_loop
(loop=0x7ffff78cd000, datarefs=0x7fffffffe7f8) at
../../gcc/gcc/tree-data-ref.c:5236
#662192 0x000000000208a604 in compute_data_dependences_for_loop
(loop=0x7ffff78cd000, compute_self_and_read_read_dependences=true,
loop_nest=0x7fffffffe750, datarefs=0x7fffffffe7f8,
dependence_relations=0x7fffffffe7f0) at ../../gcc/gcc/tree-data-ref.c:5411
#662193 0x00000000012d7b7e in tree_predictive_commoning_loop
(loop=0x7ffff78cd000) at ../../gcc/gcc/tree-predcom.c:3192
#662194 0x00000000012d8134 in tree_predictive_commoning () at
../../gcc/gcc/tree-predcom.c:3314
#662195 0x00000000012d81b4 in run_tree_predictive_commoning
(fun=0x7ffff78c6000) at ../../gcc/gcc/tree-predcom.c:3339
#662196 0x00000000012d8222 in (anonymous namespace)::pass_predcom::execute
(this=0x2fc7cb0, fun=0x7ffff78c6000) at ../../gcc/gcc/tree-predcom.c:3368
#662197 0x000000000102b1c3 in execute_one_pass (pass=0x2fc7cb0) at
../../gcc/gcc/passes.c:2474
...
Bisected to r256634, reverting manually "fixes" the problem.
>From gcc-bugs-return-650702-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 19:05:35 2019
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Subject: [Bug target/91229] RISC-V ABI problem with zero-length bit-fields and float struct fields
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91229
--- Comment #3 from Jim Wilson <wilson at gcc dot gnu.org> ---
Author: wilson
Date: Thu Aug 8 19:04:56 2019
New Revision: 274215
URL: https://gcc.gnu.org/viewcvs?rev=274215&root=gcc&view=rev
Log:
RISC-V: Fix C ABI for flattened struct with 0-length bitfield.
gcc/
PR target/91229
* config/riscv/riscv.c (riscv_flatten_aggregate_field): New arg
ignore_zero_width_bit_field_p. Skip zero size bitfields when true.
Pass into recursive call.
(riscv_flatten_aggregate_argument): New arg. Pass to
riscv_flatten_aggregate_field.
(riscv_pass_aggregate_in_fpr_pair_p): New local warned. Call
riscv_flatten_aggregate_argument twice, with false and true as last
arg. Process result twice. Compare results and warn if different.
(riscv_pass_aggregate_in_fpr_and_gpr_p): Likewise.
gcc/testsuite/
* gcc.target/riscv/flattened-struct-abi-1.c: New test.
* gcc.target/riscv/flattened-struct-abi-2.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/riscv/flattened-struct-abi-1.c
trunk/gcc/testsuite/gcc.target/riscv/flattened-struct-abi-2.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/riscv/riscv.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-650703-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 19:06:43 2019
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Subject: [Bug target/91229] RISC-V ABI problem with zero-length bit-fields and float struct fields
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Jim Wilson <wilson at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jim Wilson <wilson at gcc dot gnu.org> ---
Fixed on mainline.
>From gcc-bugs-return-650704-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 19:26:11 2019
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Subject: [Bug tree-optimization/91227] pointer relational expression not folded but equivalent inequality is
Date: Thu, 08 Aug 2019 19:26:00 -0000
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--- Comment #19 from Martin Sebor <msebor at gcc dot gnu.org> ---
That's a valid concern. Issuing a warning (either at the same time as or in
lieu of the folding) would be a way to detect and prevent these kinds of
problems. Exposing it to enough code (like in a whole distro rebuild) would
give us a pretty good idea about what the appropriate defaults ought to be.
>From gcc-bugs-return-650705-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 19:31:44 2019
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Subject: [Bug c++/91405] New: [concepts] internal compiler error: in synthesize_implicit_template_parm, at cp/parser.c:41206
Date: Thu, 08 Aug 2019 19:31:00 -0000
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Bug ID: 91405
Summary: [concepts] internal compiler error: in
synthesize_implicit_template_parm, at
cp/parser.c:41206
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
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Created attachment 46691
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46691&action=edit
Wrong usage of concepts leads to ICE
The compiler ICE's on the attached file. There are some simular bug reports
which might be the same problem or a related one, but they report a different
parser.c line.
I believe the code is incorrect and would have expected an error message like
"cannot use concept as type specifier, use template arguments instead". But it
gives an ICE.
The error happens with both g++ 7.4.0 and 9.1.0, using -fconcepts and latest
supported std version.
>From gcc-bugs-return-650706-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 19:33:28 2019
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Subject: [Bug c++/91405] [concepts] internal compiler error: in synthesize_implicit_template_parm, at cp/parser.c:41206
Date: Thu, 08 Aug 2019 19:33:00 -0000
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--- Comment #1 from Michael de Lang <kingoipo at gmail dot com> ---
Correction, the reported line number for 7.4.0 is cp.parser.c:38874
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Subject: [Bug libgcc/91379] internal compiler error __gcov_fork
Date: Thu, 08 Aug 2019 20:07:00 -0000
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--- Comment #4 from Clinton Bunch <cbunch at cfhp dot com> ---
Setting the CFLAGS and CXXFLAGS to -O0 -g as suggested didn't help. It still
blew up at the same point building libgcc.
Interestingly, I noticed that it doesn't blow up if the code is compiled in
-mlp64 mode, only in the default -milp32 mode. The process successfully builds
a 64-bit libgcc_s.so
>From gcc-bugs-return-650708-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 20:14:55 2019
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Subject: [Bug c++/91394] C++ ABI incompatibility (stdexcept)
Date: Thu, 08 Aug 2019 20:14:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Forwards compatible is not guaranteed; only backwards compatible.
That is you can compile with X and run with (X+1) libraries but not the
opposite way around. This is true with almost all software including but not
limited to GLIBC, GCC, libstdc++ (and even Windows).
>From gcc-bugs-return-650709-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 20:50:41 2019
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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/47779] Problem cross-compiling trunk for bfin
Date: Thu, 08 Aug 2019 20:50:00 -0000
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Jeffrey A. Law <law at redhat dot com> changed:
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----------------------------------------------------------------------------
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CC| |law at redhat dot com
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--- Comment #8 from Jeffrey A. Law <law at redhat dot com> ---
Per c#7.
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Subject: [Bug driver/91406] New: gcc -Q -v lies about what flags are enabled
Date: Thu, 08 Aug 2019 21:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91406
Bug ID: 91406
Summary: gcc -Q -v lies about what flags are enabled
Product: gcc
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If you run 'gcc -Q -v x.c' and look at the 'options enabled:' list, it is not
accurate. For example, on aarch64 it will show '-fprefetch-loop-arrays' which
is not on by default for a generic aarch64 compiles (even at -O3). The problem
is that this flag is initialized to -1 and it might be overridden by
aarch64_override_options_internal in some cases to turn it on but if it is not
overridden it stays at -1 and then option_enabled (opts-common.c) checks
to see if it is zero or not-zero and if not-zero it returns true and says it
is enabled. Note that in this case the compiler will not actually generate
prefetch instructions because the gate function is checking for 'x > 0', not
'x != 0' like option_enabled does.
This can affect any option in commons.opt (or elsewhere) that is initialized to
-1. There are also flags that are initialized to 1 but probably should not
show up if compiling at -O0 because in that case the pass that would check the
flag is never called, such as -faggressive-loop-optimizations for example. If
you run a '-Q -v -O0' compilation on x86 the list of enabled options will
include -faggressive-loop-optimizations which I am sure is not actually run. I
guess you could claim it is enabled but not run, but that seems unhelpful.
I could fix the specific aarch64 '-fprefetch-loop-arrays' bug by having
aarch64_override_options_internal set the prefetch flag to 0 in those cases
where it is not setting it to 1. That way it would never be -1 when
option_enabled checks it, but I am not sure this the right/best fix.
>From gcc-bugs-return-650711-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 21:33:50 2019
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Subject: [Bug c++/91394] C++ ABI incompatibility (stdexcept)
Date: Thu, 08 Aug 2019 21:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91394
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Some programs which happen to not use any new features might work with an older
version of libstdc++.so but that is not guaranteed, and definitely not
supported.
Removing one or two functions from a header is not going to solve the problem
in the general case. Using _GLIBCXX_USE_CXX11_ABI is also not a solution for
this, that's not what it's for.
If you want to run with the libstdc++.so from GCC 4.9.4 then compile with GCC
4.9.4, that's guaranteed to work.
>From gcc-bugs-return-650712-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 21:40:30 2019
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Subject: [Bug c++/90473] gcc does not call function in comma operator for default argument
Date: Thu, 08 Aug 2019 21:40:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This is where we lose the side-effect:
check_default_argument
13174 /* Avoid redundant -Wzero-as-null-pointer-constant warnings at
13175 the call sites. */
13176 if (TYPE_PTR_OR_PTRMEM_P (decl_type)
13177 && null_ptr_cst_p (arg))
13178 return nullptr_node;
Poking more...
>From gcc-bugs-return-650713-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 22:11:58 2019
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Subject: [Bug c++/90473] gcc does not call function in comma operator for default argument
Date: Thu, 08 Aug 2019 22:11:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think checking TREE_SIDE_EFFECTS there should be enough.
>From gcc-bugs-return-650714-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 22:40:21 2019
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Subject: [Bug tree-optimization/89176] Vectorizer fails to consider narrower vector width for res[i] = v1[i] < v2[i] ? v2[i] : v1[i]
Date: Thu, 08 Aug 2019 22:40:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |crazylht at gmail dot com
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Richard Biener from comment #1)
>
> The epilogue vectorization issue also needs investigation.
Epilogue vectorization doesn't seem to work:
[hjl@gnu-cfl-1 pr89176]$ cat x.i
extern float *v1;
extern float *v2;
extern float *res;
void
foo (int n)
{
int i;
for (i = 0; i < n; i++)
res[i] = v2[i] * v1[i];
}
[hjl@gnu-cfl-1 pr89176]$ make x.s
/export/build/gnu/tools-build/gcc-debug/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/tools-build/gcc-debug/build-x86_64-linux/gcc/ -O3
-march=skylake -S x.i
[hjl@gnu-cfl-1 pr89176]$ cat x.s
.file "x.i"
.text
.p2align 4
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
testl %edi, %edi
jle .L23
movq v2(%rip), %rcx
movq res(%rip), %rdx
movq v1(%rip), %rsi
leaq 31(%rcx), %r8
subq %rdx, %r8
cmpq $62, %r8
leaq 31(%rsi), %r8
seta %r9b
subq %rdx, %r8
cmpq $62, %r8
seta %r8b
leal -1(%rdi), %eax
testb %r8b, %r9b
je .L3
cmpl $6, %eax
jbe .L3
movl %edi, %r8d
shrl $3, %r8d
salq $5, %r8
xorl %eax, %eax
.p2align 4,,10
.p2align 3
.L4:
vmovups (%rcx,%rax), %ymm1
vmulps (%rsi,%rax), %ymm1, %ymm0
vmovups %ymm0, (%rdx,%rax)
addq $32, %rax
cmpq %r8, %rax
jne .L4
movl %edi, %eax
andl $-8, %eax
testb $7, %dil
je .L22
movl %eax, %r8d
vmovss (%rcx,%r8,4), %xmm0
vmulss (%rsi,%r8,4), %xmm0, %xmm0
vmovss %xmm0, (%rdx,%r8,4)
leal 1(%rax), %r8d
cmpl %r8d, %edi
jle .L22
movslq %r8d, %r8
vmovss (%rcx,%r8,4), %xmm0
vmulss (%rsi,%r8,4), %xmm0, %xmm0
vmovss %xmm0, (%rdx,%r8,4)
leal 2(%rax), %r8d
cmpl %r8d, %edi
jle .L22
movslq %r8d, %r8
vmovss (%rcx,%r8,4), %xmm0
vmulss (%rsi,%r8,4), %xmm0, %xmm0
vmovss %xmm0, (%rdx,%r8,4)
leal 3(%rax), %r8d
cmpl %r8d, %edi
jle .L22
movslq %r8d, %r8
vmovss (%rcx,%r8,4), %xmm0
vmulss (%rsi,%r8,4), %xmm0, %xmm0
vmovss %xmm0, (%rdx,%r8,4)
leal 4(%rax), %r8d
cmpl %r8d, %edi
jle .L22
movslq %r8d, %r8
vmovss (%rcx,%r8,4), %xmm0
vmulss (%rsi,%r8,4), %xmm0, %xmm0
vmovss %xmm0, (%rdx,%r8,4)
leal 5(%rax), %r8d
cmpl %r8d, %edi
jle .L22
movslq %r8d, %r8
vmovss (%rcx,%r8,4), %xmm0
addl $6, %eax
vmulss (%rsi,%r8,4), %xmm0, %xmm0
vmovss %xmm0, (%rdx,%r8,4)
cmpl %eax, %edi
jle .L22
cltq
vmovss (%rcx,%rax,4), %xmm0
vmulss (%rsi,%rax,4), %xmm0, %xmm0
vmovss %xmm0, (%rdx,%rax,4)
vzeroupper
ret
.p2align 4,,10
.p2align 3
.L22:
vzeroupper
.L23:
ret
.p2align 4,,10
.p2align 3
.L3:
movl %eax, %edi
xorl %eax, %eax
.p2align 4,,10
.p2align 3
.L6:
vmovss (%rcx,%rax,4), %xmm0
movq %rax, %r8
vmulss (%rsi,%rax,4), %xmm0, %xmm0
vmovss %xmm0, (%rdx,%rax,4)
incq %rax
cmpq %rdi, %r8
jne .L6
ret
.cfi_endproc
.LFE0:
.size foo, .-foo
.ident "GCC: (GNU) 10.0.0 20190723 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-1 pr89176]$
>From gcc-bugs-return-650715-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 22:48:43 2019
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug driver/80545] option -Wstringop-overflow not recognized by Fortran
Date: Thu, 08 Aug 2019 22:48:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #8 from Martin Sebor <msebor at gcc dot gnu.org> ---
I believe r273771 fully this bug.
>From gcc-bugs-return-650716-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 08 22:48:44 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug ada/82813] warning: '.builtin_memcpy' writing between 2 and 6 bytes into a region of size 0 overflows the destination [-Wstringop-overflow=]
Date: Thu, 08 Aug 2019 22:48:00 -0000
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Bug 82813 depends on bug 80545, which changed state.
Bug 80545 Summary: option -Wstringop-overflow not recognized by Fortran
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80545
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
>From gcc-bugs-return-650717-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 00:57:45 2019
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/90473] gcc does not call function in comma operator for default argument
Date: Fri, 09 Aug 2019 00:57:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00597.html
>From gcc-bugs-return-650718-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 01:16:48 2019
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91397] -Wstringop-overflow specified bound 18446744073709551615 exceeds maximum object size 9223372036854775807
Date: Fri, 09 Aug 2019 01:16:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #10 from Martin Sebor <msebor at gcc dot gnu.org> ---
GCC assumes that no object can be bigger than PTRDIFF_MAX - 1 bytes and warns
when it detects code that expects otherwise. A more general condition to add
to mem_strdupl() to avoid the warning is:
if (len >= PTRDIFF_MAX)
__builtin_unreachable ();
GCC doesn't track pointer ranges as well as it does integers and it easily
"loses" information about their relationships. For instance, in the functions
below, GCC folds the first test to false but it doesn't fold the second.
void f (long a, long b)
{
if (a < b)
return;
if (a - b < 0) // folded to false
__builtin_abort ();
}
void g (int *a, int *b)
{
if (a < b)
return;
if (a - b < 0) // not folded
__builtin_abort ();
}
>From gcc-bugs-return-650719-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 04:16:52 2019
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Subject: [Bug c++/80078] Incorrect classification of address of volatile as not constant
Date: Fri, 09 Aug 2019 04:16:00 -0000
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--- Comment #3 from Christopher Head <headch at gmail dot com> ---
I tried 9.1 at gcc.godbolt.org and it looks like this is fixed. Anyone else
care to take a look? If there are no further comments, I guess I’ll close this
ticket in a few days.
>From gcc-bugs-return-650720-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 04:19:28 2019
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Subject: [Bug target/48595] score-elf fails to build with --enable-werror-always
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |build
Status|UNCONFIRMED |WAITING
Last reconfirmed|2013-02-25 00:00:00 |2019-08-09
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--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #1)
> does this still happen?
WAITING on a reply
>From gcc-bugs-return-650721-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 06:44:09 2019
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Subject: [Bug c++/91377] [8/9/10 Regression] ICE with non-static block scope constexpr, captured in lambda, used as template parameter
Date: Fri, 09 Aug 2019 06:44:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |marxin at gcc dot gnu.org
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 46692
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46692&action=edit
Reduced test-case
>From gcc-bugs-return-650722-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 06:58:54 2019
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
Date: Fri, 09 Aug 2019 06:58:00 -0000
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--- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #8)
> > --- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
> > (In reply to Martin Liška from comment #6)
> >> Good, then let me take a look.
> >
> > So I've just tested current master of binutils and I can see:
> >
> > marxin@marxinbox:/tmp> gcc --version
> > gcc (GCC) 10.0.0 20190806 (experimental)
> > Copyright (C) 2019 Free Software Foundation, Inc.
> > This is free software; see the source for copying conditions. There is NO
> > warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> >
> > marxin@marxinbox:/tmp> gcc -c -flto main.c
> >
> > $ nm main.o
> > nm: main.o: plugin needed to handle lto object
> > 0000000000000001 C __gnu_lto_slim
> >
> > The issue here is that the installed nm can't load plugin from bfd-plugins:
> >
> > $ strace -f -s512 nm main.o 2>&1 | grep plugin
> > openat(AT_FDCWD, "/home/marxin/bin/binutils/bin/../bin/../lib/bfd-plugins",
> > O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 4
> > stat("/home/marxin/bin/binutils/bin/../bin/../lib/bfd-plugins/..",
> > {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
> > stat("/home/marxin/bin/binutils/bin/../bin/../lib/bfd-plugins/.",
> > {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
> > write(2, "main.o: plugin needed to handle lto object", 42main.o: plugin needed
> > to handle lto object) = 42
> >
> > $ nm --plugin /dev/shm/objdir/lto-plugin/.libs/liblto_plugin.so.0.0.0 main.o
> > 00000000 T main
> >
> > So the question is if you have a LTO plugin accessible for the built gold or
> > nm?
>
> I don't see how nm would come into play here.
I thought you see the failure for all tests. Then one could use nm to identify
if LTO plugin is properly loaded.
> For one, I've only
> installed gas and gld from binutils trunk under non-standard names
> (gas-2.32.51 and gld-2.32.51) and use them via --with-as and --with-ld.
>
> The failing testcases boils down to (run in gcc/testsuite/g++):
>
> #!/bin/sh
>
> COLLECT_GCC=../../xg++ \
> COLLECT_GCC_OPTIONS= \
> COLLECT_LTO_WRAPPER=../../lto-wrapper \
> COMPILER_PATH=../.. \
> \
> /vol/gcc/bin/gld-2.32.51 \
> -plugin ../../liblto_plugin.so \
> -plugin-opt=../../lto-wrapper \
> -plugin-opt=-fresolution=cp_lto_pr90990_0.res \
> -plugin-opt=-v \
> -plugin-opt=-save-temps \
> -o g++-dg-lto-pr90990-01.exe -r cp_lto_pr90990_0.o
>
> $ gld.cmd
> ../../lto-wrapper -fresolution=cp_lto_pr90990_0.res -flinker-output=rel
> cp_lto_pr90990_0.o
> /vol/gcc/bin/gld-2.32.51: /var/tmp//ccKkavFd.lto.o: plugin needed to handle
> lto object
> [Leaving g++-dg-lto-pr90990-01.exe.lto_wrapper_args]
> [Leaving /var/tmp//ccKkavFd.lto.o]
Can you please send me the *.o files so that I can investigate them?
>
> When I run this under truss (Solaris equivalent of strace), I find just
> the following calls to execve:
>
> 12815: execve("../../lto-wrapper", 0xFEFFD6F4, 0xFEFFD844) argc = 2
> 12815: argv: ../../lto-wrapper
> 12815: @g++-dg-lto-pr90990-01.exe.lto_wrapper_args
>
> 12817: execve("../../xg++", 0xFEFFD5A4, 0xFEFFD990) argc = 2
> 12817: argv: ../../xg++ @/var/tmp//ccxh7UCb
>
> 12819: execve("../../lto1", 0x08189FD0, 0x08187784) argc = 19
> 12819: argv: ../../lto1 -quiet -dumpbase cp_lto_pr90990_0.o
> 12819: -mtune=generic -march=pentium4 -auxbase-strip
> 12819: /var/tmp//ccKkavFd.lto.o -O0 -fno-openmp -fno-openacc
> 12819: -fno-pie -fno-diagnostics-show-caret
> 12819: -fno-diagnostics-show-line-numbers
> 12819: -fresolution=cp_lto_pr90990_0.res -flinker-output=rel
> 12819: @/var/tmp//ccsvXE.b -o /var/tmp//ccM632hc.s
>
> 12821: execve("/vol/gcc/bin/gas-2.32.51", 0x08189FD0, 0x08187784) argc = 7
> 12821: argv: /vol/gcc/bin/gas-2.32.51 -Qy -s --32 -o
> 12821: /var/tmp//ccKkavFd.lto.o /var/tmp//ccM632hc.s
>
> There's no nm anywhere in sight. Besides, I find it very strange that
> out of hundreds if not thousends of LTO tests during this bootstrap,
> only a single one shows this error. If there were a fundamental
> problem, I'd expect a way larger number here.
That's strange! The test-case is not special to me.
>From gcc-bugs-return-650723-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:00:55 2019
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/91404] [10 Regression] internal compiler error: Segmentation fault
Date: Fri, 09 Aug 2019 07:00:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-08-09
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Ok, I'm trying to reproduce that.
>From gcc-bugs-return-650724-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:01:16 2019
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/91403] GCC fails with ICE.
Date: Fri, 09 Aug 2019 07:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91403
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-08-09
Version|tree-ssa |10.0
Ever confirmed|0 |1
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yeah, I know. I tried to fix this for PR91178 but needed to revert. The
vectorizer issue uncovers places where we run into compile-time issues with
these large increment chains and I've fixed some but in the end a vectorizer
fix is required.
My mind tells me that at some point we limited the group gap but I didn't
find records of that. In the end it should be "easy" to avoid the bad
codegen, but vectorizable_load is kind-of a mess and hairy to adjust ...
I'll give it another try.
>From gcc-bugs-return-650725-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:06:48 2019
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From: "asorenji at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91407] New: Wnon-virtual-dtor should't fire for classes with operator deleteÞlete
Date: Fri, 09 Aug 2019 07:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91407
Bug ID: 91407
Summary: Wnon-virtual-dtor should't fire for classes with
operator delete=delete
Product: gcc
Version: 8.3.0
Status: UNCONFIRMED
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Okay, attempt of delete polymorphic class without virtual destructor, lead to
UB. But, I want trivially destructible class with virtual functions. So, I just
mark operator delete as delete. No delete expression - no problem. But gcc
still show me a warning.
gcc (Debian 8.3.0-6) 8.3.0
Command line:
gcc main.cpp -Wnon-virtual-dtor
Source:
class Test
{
public:
virtual void foo(){}
void operator delete(void*)=delete;
};
int main()
{
return 0;
}
Yes, yes, although "delete pointer" don't work, "::delete pointer" still
worked. But it's just a shoot in the foot.
>From gcc-bugs-return-650726-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:21:26 2019
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/91408] New: [10 Regression] ICE in extract_insn, at recog.c:2310 since r273981
Date: Fri, 09 Aug 2019 07:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91408
Bug ID: 91408
Summary: [10 Regression] ICE in extract_insn, at recog.c:2310
since r273981
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
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Starting from the revision, I see ICE for:
$ cat ice.i
long long a;
unsigned char b;
short *c;
int d;
void fn1(long long *p1) {
unsigned char *e = (char *)p1;
int f, g;
d = 0;
for (; d < 8; d++) {
f = b - e[d];
if (f < 0)
f = -f;
g += f;
}
c[0] = g;
}
void fn2() { fn1(&a); }
$ gcc -O2 -ftree-loop-vectorize -O2 -fno-tree-forwprop ice.i -c
ice.i: In function ‘fn2’:
ice.i:17:1: error: unrecognizable insn:
17 | void fn2() { fn1(&a); }
| ^~~~
(insn 13 12 14 2 (set (reg:V1DI 99)
(unspec:V1DI [
(reg:V8QI 93)
(mem/c:V8QI (reg/f:DI 97) [0 MEM <vector(8) unsigned char>
[(unsigned char *)&a]+0 S8 A64])
] UNSPEC_PSADBW)) -1
(nil))
during RTL pass: vregs
ice.i:17:1: internal compiler error: in extract_insn, at recog.c:2310
0x6a4bb7 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/home/marxin/Programming/gcc/gcc/rtl-error.c:108
0x6a4bd3 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/home/marxin/Programming/gcc/gcc/rtl-error.c:116
0x6a2d47 extract_insn(rtx_insn*)
/home/marxin/Programming/gcc/gcc/recog.c:2310
0xab4f63 instantiate_virtual_regs_in_insn
/home/marxin/Programming/gcc/gcc/function.c:1606
0xab4f63 instantiate_virtual_regs
/home/marxin/Programming/gcc/gcc/function.c:1976
0xab4f63 execute
/home/marxin/Programming/gcc/gcc/function.c:2025
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-650727-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:21:40 2019
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Subject: [Bug target/91408] [10 Regression] ICE in extract_insn, at recog.c:2310 since r273981
Date: Fri, 09 Aug 2019 07:21:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-09
Known to work| |9.1.0
Target Milestone|--- |10.0
Ever confirmed|0 |1
Known to fail| |10.0
>From gcc-bugs-return-650728-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:23:39 2019
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/91401] schedule + dist_schedule clauses rejected on distribute parallel for
Date: Fri, 09 Aug 2019 07:23:00 -0000
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Aug 9 07:23:03 2019
New Revision: 274226
URL: https://gcc.gnu.org/viewcvs?rev=274226&root=gcc&view=rev
Log:
PR c/91401
c/
* c-parser.c (c_parser_omp_clause_dist_schedule): Fix up typos in the
check_no_duplicate_clause call. Comment it out, instead emit a
warning for duplicate dist_schedule clauses.
cp/
* parser.c (cp_parser_omp_clause_dist_schedule): Comment out the
check_no_duplicate_clause call, instead emit a warning for duplicate
dist_schedule clauses.
testsuite/
* c-c++-common/gomp/pr91401-1.c: New test.
* c-c++-common/gomp/pr91401-2.c: New test.
Added:
trunk/gcc/testsuite/c-c++-common/gomp/pr91401-1.c
trunk/gcc/testsuite/c-c++-common/gomp/pr91401-2.c
Modified:
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-parser.c
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-650729-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:27:29 2019
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Subject: [Bug lto/91393] [10 Regression] lto1: internal compiler error: decompressed stream: Destination buffer is too small
Date: Fri, 09 Aug 2019 07:27:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |10.0
Summary|lto1: internal compiler |[10 Regression] lto1:
|error: decompressed stream: |internal compiler error:
|Destination buffer is too |decompressed stream:
|small |Destination buffer is too
| |small
>From gcc-bugs-return-650730-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:30:50 2019
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Subject: [Bug other/91396] Link error when I use -fvtable-verify=std and -static
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|driver |other
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Likely
#define GNU_USER_TARGET_STARTFILE_SPEC \
...
%{fvtable-verify=none:%s; \
fvtable-verify=preinit:vtv_start_preinit.o%s; \
fvtable-verify=std:vtv_start.o%s} " \
should either be conditional on !static or indeed the copy removed from the
static libvtv.
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Subject: [Bug c/91398] Possible missed optimization: Can a pointer be passed as hidden pointer in x86-64 System V ABI
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
On GIMPLE we see stores to the RESULT_DECL where accesses to that are not
expected to trap, this means on GIMPLE nothing prevents hoisting before EH
handling for example. There probably isn't any incentive for a pass to do
that but nothing prevents it.
So I'd argue such ABI restriction cannot be implemented unless the caller
caters for it by using a temporary like we do in the "unwanted unoptimized"
code example.
I think also that C++ language semantics require that if a function F
throws an assignment as part of the function call is not carried out,
so it isn't an ABI issue alone. (and for C we support -fexceptions
as well).
For EH we'd have stmt_could_throw_p () but I don't think we have anything
that tells us a callee does not return via longjmp.
Thus I don't see how to implement this correctly.
>From gcc-bugs-return-650732-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:46:02 2019
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Subject: [Bug target/91400] __builtin_cpu_supports conjunction is optimized poorly
Date: Fri, 09 Aug 2019 07:46:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |x86_64-*-*, i?86-*-*
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-09
Component|tree-optimization |target
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. The issue is that the target builds a new(!) VAR_DECL for
__cpu_mode for _each_(!) invocation of __builtin_cpu_supports so the GIMPLE
level optimizers have no chance to CSE the loads. The two VAR_DECLs for
this testcase are
<var_decl 0x7ffff7fefb40 __cpu_model type <record_type 0x7ffff69c8888
__processor_model>
public static external weak preserve BLK (null):0:0
size <integer_cst 0x7ffff69ade10 constant 160>
unit-size <integer_cst 0x7ffff69ade40 constant 20>
align:32 warn_if_not_align:0>
<var_decl 0x7ffff7fefab0 __cpu_model type <record_type 0x7ffff69c8498
__processor_model>
public static external weak preserve BLK (null):0:0
size <integer_cst 0x7ffff69ade10 constant 160>
unit-size <integer_cst 0x7ffff69ade40 constant 20>
align:32 warn_if_not_align:0>
so you can see that we even re-build the RECORD_TYPE from scratch... :/
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Subject: [Bug ipa/91404] [10 Regression] ICE in gt_ggc_mx_symtab_node at gcc/gtype-desc.c:1302
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |10.0
>From gcc-bugs-return-650734-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:47:09 2019
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Subject: [Bug target/91408] [10 Regression] ICE in extract_insn, at recog.c:2310 since r273981
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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>From gcc-bugs-return-650735-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:48:47 2019
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Subject: [Bug target/91408] [10 Regression] ICE in extract_insn, at recog.c:2310 since r273981
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--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
Just change vector_operand predicates in usadv8qi to register_operand.
>From gcc-bugs-return-650736-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 07:49:19 2019
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Subject: [Bug driver/91406] gcc -Q -v lies about what flags are enabled
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
-Q -v is only a wild guess given whether options are enabled or disabled may
depend on the function context. There's really no way to implement it
accurately
(this -1 trick for "auto-detection" could eventually be handled in some
generic way, saying not enabled/disabled but "<auto>" or "<unknown>")
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Subject: [Bug target/91408] [10 Regression] ICE in extract_insn, at recog.c:2310 since r273981
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Yeah, that is what I'm testing. Both instructions use register_mmxmem_operand
which is for mmx with sse actually a register_operand.
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Subject: [Bug target/91408] [10 Regression] ICE in extract_insn, at recog.c:2310 since r273981
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 46693
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46693&action=edit
gcc10-pr91408.patch
Full untested patch.
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Subject: [Bug lto/91393] [10 Regression] lto1: internal compiler error: decompressed stream: Destination buffer is too small
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--- Comment #2 from David Binderman <dcb314 at hotmail dot com> ---
Created attachment 46694
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xz compressed tar file
cat bug1.txz | xz -d | tar xvf - should do it.
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--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
Created attachment 46695
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46695&action=edit
xz compressed tar file
cat bug2.txz | xz -d | tar xvf - should do it.
First attachment contains object files [_a-m]* and second has
[n-z]*.
I used recent trunk compiler. x86_64, if that makes any difference.
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
Date: Fri, 09 Aug 2019 08:16:00 -0000
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--- Comment #10 from Rainer Orth <ro at gcc dot gnu.org> ---
Created attachment 46696
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i386-pc-solaris2.11 input objects
>From gcc-bugs-return-650743-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 08:21:48 2019
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From: "ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
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--- Comment #11 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
> (In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #8)
[...]
>> I don't see how nm would come into play here.
>
> I thought you see the failure for all tests. Then one could use nm to identify
> if LTO plugin is properly loaded.
Ok, I see.
>> $ gld.cmd
>> ../../lto-wrapper -fresolution=cp_lto_pr90990_0.res -flinker-output=rel
>> cp_lto_pr90990_0.o
>> /vol/gcc/bin/gld-2.32.51: /var/tmp//ccKkavFd.lto.o: plugin needed to handle
>> lto object
>> [Leaving g++-dg-lto-pr90990-01.exe.lto_wrapper_args]
>> [Leaving /var/tmp//ccKkavFd.lto.o]
>
> Can you please send me the *.o files so that I can investigate them?
Sure, attached.
>> There's no nm anywhere in sight. Besides, I find it very strange that
>> out of hundreds if not thousends of LTO tests during this bootstrap,
>> only a single one shows this error. If there were a fundamental
>> problem, I'd expect a way larger number here.
>
> That's strange! The test-case is not special to me.
So one would think. However, the fact that I'm not the only one seeing
this particular failure suggests otherwise...
>From gcc-bugs-return-650742-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 08:21:14 2019
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Subject: [Bug lto/91393] [10 Regression] lto1: internal compiler error: decompressed stream: Destination buffer is too small
Date: Fri, 09 Aug 2019 08:21:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
I can reproduce that now with:
$ gcc .libs/open.o
lto1: internal compiler error: decompressed stream: Destination buffer is too
small
0xb3d04b lto_uncompression_zstd
/home/marxin/Programming/gcc/gcc/lto-compress.c:170
0xb3d7ce lto_end_uncompression(lto_compression_stream*, lto_compression)
/home/marxin/Programming/gcc/gcc/lto-compress.c:408
0xb3b66c lto_get_section_data(lto_file_decl_data*, lto_section_type, char
const*, unsigned long*, bool)
/home/marxin/Programming/gcc/gcc/lto-section-in.c:164
0x86ec4c cgraph_node::get_untransformed_body()
/home/marxin/Programming/gcc/gcc/cgraph.c:3578
0x87b36e cgraph_node::expand()
/home/marxin/Programming/gcc/gcc/cgraphunit.c:2164
0x87c3db expand_all_functions
/home/marxin/Programming/gcc/gcc/cgraphunit.c:2332
0x87c3db symbol_table::compile()
/home/marxin/Programming/gcc/gcc/cgraphunit.c:2688
0x7da5f1 lto_main()
/home/marxin/Programming/gcc/gcc/lto/lto.c:644
>From gcc-bugs-return-650744-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 08:26:03 2019
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Subject: [Bug lto/91393] [10 Regression] lto1: internal compiler error: decompressed stream: Destination buffer is too small
Date: Fri, 09 Aug 2019 08:26:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Where the problematic section is:
$ readelf -S -W .libs/open.o
There are 27 section headers, starting at offset 0x3048:
Section Headers:
[Nr] Name Type Address Off Size ES Flg
Lk Inf Al
...
[15] .gnu.lto_open.e5c71689fb58e64f PROGBITS 0000000000000000 000954
000a9d 00 E 0 0 1
...
@David: Can you please create a pro-processed file for open.o and the full
command line that was used to create the object?
>From gcc-bugs-return-650745-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 08:32:46 2019
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Subject: [Bug ipa/91404] [10 Regression] ICE in gt_ggc_mx_symtab_node at gcc/gtype-desc.c:1302
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Perhaps try -fdirectives-only preprocessing?
>From gcc-bugs-return-650746-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 08:43:26 2019
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Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
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--- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #11)
> > --- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
> > (In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #8)
> [...]
> >> I don't see how nm would come into play here.
> >
> > I thought you see the failure for all tests. Then one could use nm to identify
> > if LTO plugin is properly loaded.
>
> Ok, I see.
>
> >> $ gld.cmd
> >> ../../lto-wrapper -fresolution=cp_lto_pr90990_0.res -flinker-output=rel
> >> cp_lto_pr90990_0.o
> >> /vol/gcc/bin/gld-2.32.51: /var/tmp//ccKkavFd.lto.o: plugin needed to handle
> >> lto object
> >> [Leaving g++-dg-lto-pr90990-01.exe.lto_wrapper_args]
> >> [Leaving /var/tmp//ccKkavFd.lto.o]
> >
> > Can you please send me the *.o files so that I can investigate them?
>
> Sure, attached.
When using current binutils master I see:
$ ~/bin/binutils/bin/nm --version
GNU nm (GNU Binutils) 2.32.51.20190809
$ ~/bin/binutils/bin/nm --plugin
/dev/shm/objdir/lto-plugin/.libs/liblto_plugin.so.0.0.0 ccKkavFd.lto.o
U __gxx_personality_v0
00000000 W _ZN1AC1Ev
00000000 W _ZN1AC2Ev
U _ZN1BixEi
00000000 W _ZN1CclE1A
U _ZN1D5m_fn1Ev
00000000 T _ZN1FC1ER1DRK1A
00000000 T _ZN1FC2ER1DRK1A
$ ~/bin/binutils/bin/nm ccKkavFd.lto.o
/home/marxin/bin/binutils/bin/nm: ccKkavFd.lto.o: plugin needed to handle lto
object
00000001 C __gnu_lto_slim
So as seen, if the plugin is loaded, then I can't see the error message.
>
> >> There's no nm anywhere in sight. Besides, I find it very strange that
> >> out of hundreds if not thousends of LTO tests during this bootstrap,
> >> only a single one shows this error. If there were a fundamental
> >> problem, I'd expect a way larger number here.
> >
> > That's strange! The test-case is not special to me.
>
> So one would think. However, the fact that I'm not the only one seeing
> this particular failure suggests otherwise...
Can you please send me links to the test-suite reports?
>From gcc-bugs-return-650747-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 08:48:29 2019
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Subject: [Bug lto/91393] [10 Regression] lto1: internal compiler error: decompressed stream: Destination buffer is too small
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--- Comment #6 from David Binderman <dcb314 at hotmail dot com> ---
Command line seems to be
/home/dcb/gcc/results.274150/bin/gcc -O3 -flto -g -pipe -Wall
-Werror=format-se
curity -fexceptions -fstack-protector-strong -grecord-gcc-switches
-fasynchr
onous-unwind-tables -fstack-clash-protection -c -fPIC /tmp/q.i
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Subject: [Bug lto/91393] [10 Regression] lto1: internal compiler error: decompressed stream: Destination buffer is too small
Date: Fri, 09 Aug 2019 08:50:00 -0000
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--- Comment #7 from David Binderman <dcb314 at hotmail dot com> ---
Created attachment 46697
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46697&action=edit
preprocessed C source code
Preprocessed source code for open.c (aka /tmp/q.i in previous comment)
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Subject: [Bug ipa/91404] [10 Regression] ICE in gt_ggc_mx_symtab_node at gcc/gtype-desc.c:1302
Date: Fri, 09 Aug 2019 08:52:00 -0000
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Good, now I can reproduce it. I was wrongly building xalancbmk from SPEC2017.
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From: "tanaya_patil at persistent dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug plugins/90924] lto-plugin/lto-plugin.c heap memory corruption due to insufficient sanitization.
Date: Fri, 09 Aug 2019 09:18:00 -0000
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Tanaya Patil <tanaya_patil at persistent dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tanaya_patil at persistent dot com
--- Comment #11 from Tanaya Patil <tanaya_patil at persistent dot com> ---
Hello,
May I know if Binutils-2.31 is also affected and requires this fix? Any heads
up will be appreciated.
Thank you in advance.
Best Regards,
>From gcc-bugs-return-650751-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 09:25:05 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/91393] [10 Regression] lto1: internal compiler error: decompressed stream: Destination buffer is too small
Date: Fri, 09 Aug 2019 09:25:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |ASSIGNED
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=88220
--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Thank you David, now I can see it:
$ cat pr91393.i
void __open_alias(int, ...) __asm__("open");
void __open_alias(int flags, ...) {}
extern __inline __attribute__((__gnu_inline__)) int open() {}
struct {
void *func;
} a = {open};
$ gcc -flto -O pr91393.i
lto1: internal compiler error: decompressed stream: Destination buffer is too
small
0xb3d04b lto_uncompression_zstd
/home/marxin/Programming/gcc/gcc/lto-compress.c:170
0xb3d7ce lto_end_uncompression(lto_compression_stream*, lto_compression)
/home/marxin/Programming/gcc/gcc/lto-compress.c:408
0xb3b66c lto_get_section_data(lto_file_decl_data*, lto_section_type, char
const*, unsigned long*, bool)
/home/marxin/Programming/gcc/gcc/lto-section-in.c:164
0x86ec4c cgraph_node::get_untransformed_body()
/home/marxin/Programming/gcc/gcc/cgraph.c:3578
0x87b36e cgraph_node::expand()
/home/marxin/Programming/gcc/gcc/cgraphunit.c:2164
0x87c3db expand_all_functions
/home/marxin/Programming/gcc/gcc/cgraphunit.c:2332
0x87c3db symbol_table::compile()
/home/marxin/Programming/gcc/gcc/cgraphunit.c:2688
0x7da5f1 lto_main()
/home/marxin/Programming/gcc/gcc/lto/lto.c:644
Looks to me very similar to PR88220.
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Subject: [Bug c++/90313] [7/8/9/10 Regression] Is an assignment elided with gcc7.3 -O2?
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--- Comment #4 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Author: rsandifo
Date: Fri Aug 9 09:37:55 2019
New Revision: 274234
URL: https://gcc.gnu.org/viewcvs?rev=274234&root=gcc&view=rev
Log:
Reject tail calls that read from an escaped RESULT_DECL (PR90313)
In this PR we have two return paths from a function "map". The common
code sets <result> to the value returned by one path, while the other
path does:
<retval> = map (&<retval>, ...);
We treated this call as tail recursion, losing the copy semantics
on the value returned by the recursive call.
We'd correctly reject the same thing for variables:
local = map (&local, ...);
The problem is that RESULT_DECLs didn't get the same treatment.
2019-08-09 Richard Sandiford <richard.sandiford@arm.com>
gcc/
PR middle-end/90313
* tree-tailcall.c (find_tail_calls): Reject calls that might
read from an escaped RESULT_DECL.
gcc/testsuite/
PR middle-end/90313
* g++.dg/torture/pr90313.cc: New test.
Added:
trunk/gcc/testsuite/g++.dg/torture/pr90313.cc
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-tailcall.c
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Subject: [Bug c++/90313] [7/8/9 Regression] Is an assignment elided with gcc7.3 -O2?
Date: Fri, 09 Aug 2019 09:40:00 -0000
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[7/8/9/10 Regression] Is an |[7/8/9 Regression] Is an
|assignment elided with |assignment elided with
|gcc7.3 -O2? |gcc7.3 -O2?
--- Comment #5 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Fixed on trunk so far. Will backport in a week or so if there are no problems.
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Subject: [Bug ipa/91404] [10 Regression] ICE in gt_ggc_mx_symtab_node at gcc/gtype-desc.c:1302
Date: Fri, 09 Aug 2019 10:04:00 -0000
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
I've got a patch candidate..
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/91154] [10 Regression] 456.hmmer regression on Haswell caused by r272922
Date: Fri, 09 Aug 2019 11:03:00 -0000
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--- Comment #20 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 7 Aug 2019, segher at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91154
>
> Segher Boessenkool <segher at gcc dot gnu.org> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |segher at gcc dot gnu.org
>
> --- Comment #19 from Segher Boessenkool <segher at gcc dot gnu.org> ---
> So how does this cause 12% degradation (20% by some other measurements)
> on power9? Pretty much everything is the *opposite* way around for us:
> we do have cheap conditional moves, we do prefer integer registers.
Might be that speculating the jump (which is very very well predicted)
is still a lot faster than the conditional move.
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From: "mserdarsanli at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/91409] New: Missed optimization on `labels as values` expression
Date: Fri, 09 Aug 2019 11:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91409
Bug ID: 91409
Summary: Missed optimization on `labels as values` expression
Product: gcc
Version: 9.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
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I recently posted about this on SO, but it did not gain much traction:
https://stackoverflow.com/questions/55987401/gcc-clang-labels-as-values-computing-offsets-at-runtime
The missed optimization is when using `labels as values` feature and computing
address difference. The expression `&&label2 - &&label1` generates code that
does the subtraction on runtime, while it might be possible to compute it on
compile time.
Godbolt link: https://godbolt.org/z/zZdFYo
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Subject: [Bug target/91409] Missed optimization on `labels as values` expression
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |x86_64-*-*, i?86-*-*
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-09
Component|tree-optimization |target
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think the issue is that &&L1 - &&L2 is not treated as a constant expression
and thus is expanded as
(insn 8 6 9 2 (set (reg:DI 86)
(label_ref:DI [4 deleted])) "t.i":5:13 -1
(insn_list:REG_LABEL_OPERAND 4 (nil)))
(insn 9 8 10 2 (parallel [
(set (reg:DI 85)
(minus:DI (reg:DI 86)
(label_ref:DI [6 deleted])))
(clobber (reg:CC 17 flags))
]) "t.i":5:13 -1
(insn_list:REG_LABEL_OPERAND 6 (nil)))
that might be ultimatively a target issue (the actual difference is to be
resolved by the assembler of course). Simple testcase:
int foo()
{
L1:
L2:
return &&L1 - &&L2;
}
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Subject: [Bug lto/88220] LTO ICE with GNU inline and alias's
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Good, I've got a patch for it.
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Subject: [Bug lto/91393] [10 Regression] lto1: internal compiler error: decompressed stream: Destination buffer is too small
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--- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
I've got a patch candidate for it.
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Subject: [Bug ipa/91404] [10 Regression] ICE in gt_ggc_mx_symtab_node at gcc/gtype-desc.c:1302
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Patch candidate:
https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00628.html
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Subject: [Bug middle-end/64501] Unreachable catch BB for try blocks that cannot create an exception of specific type
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Martin Liška <marxin at gcc dot gnu.org> changed:
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>From gcc-bugs-return-650762-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 13:59:10 2019
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Subject: [Bug tree-optimization/90838] Detect table-based ctz implementation
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Wilco <wilco at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Wilco <wilco at gcc dot gnu.org> ---
I'll have a look at this, I think it could easily be done in match.pd if we add
support for matching array references.
>From gcc-bugs-return-650763-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 14:39:47 2019
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From: "judicael.grasset at stfc dot ac.uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/91410] New: OpenMP error message when compiling OpenACC code
Date: Fri, 09 Aug 2019 14:39:00 -0000
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Bug ID: 91410
Summary: OpenMP error message when compiling OpenACC code
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: judicael.grasset at stfc dot ac.uk
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Hello,
When compiling the code below, the compiler generates error messages about
OpenMP syntax errors, but the code only uses OpenACC pragmas.
Also I think the code should compile and work fine.
I'm using GCC 9.1 with Power8 CPU
main.f:
program main
type t
integer, allocatable :: inside(:)
end type t
type(t) :: my_t
integer :: i
allocate(my_t%inside(100))
!$acc enter data copyin(my_t, my_t%inside)
!$acc parallel loop present(my_t, my_t%inside)
do i=1,100
my_t%inside(i) = i
end do
!$acc exit data copyout(my_t%inside, my_t)
write(*,*)my_t%inside
end program main
Compiling with:
gfortran main.f -Wall -Wextra -fopenacc
Error messages:
main.f:9:34:
9 | !$acc enter data copyin(my_t, my_t%inside)
| 1
Error: Syntax error in OpenMP variable list at (1)
main.f:10:38:
10 | !$acc parallel loop present(my_t, my_t%inside)
| 1
Error: Syntax error in OpenMP variable list at (1)
main.f:14:28:
14 | !$acc exit data copyout(my_t%inside, my_t)
| 1
Error: Syntax error in OpenMP variable list at (1)
$gfortran -v
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/gpfs/paragon/local/HCRI016/dre03/jxg58-dre03/softs/gcc-9.1/libexec/gcc/powerpc64le-unknown-linux-gnu/9.1.0/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
Target: powerpc64le-unknown-linux-gnu
Configured with:
/gpfs/paragon/local/HCRI016/dre03/jxg58-dre03/gcc-9.1.0/configure
--enable-offload-targets=nvptx-none
--with-cuda-driver-include=/gpfs/paragon/local/apps/cuda/9.2//include
--with-cuda-driver-lib=/gpfs/paragon/local/apps/cuda/9.2//lib64
--disable-bootstrap --disable-multilib --enable-languages=c,c++,fortran,lto
--with-cpu-64=power8 --with-tune-64=power8
--prefix=/gpfs/paragon/local/HCRI016/dre03/jxg58-dre03/softs/gcc-9.1
Thread model: posix
gcc version 9.1.0 (GCC)
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Subject: [Bug plugins/90924] lto-plugin/lto-plugin.c heap memory corruption due to insufficient sanitization.
Date: Fri, 09 Aug 2019 15:19:00 -0000
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Nick Clifton <nickc at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |nickc at gcc dot gnu.org
--- Comment #12 from Nick Clifton <nickc at gcc dot gnu.org> ---
Hi Tanaya,
(In reply to Tanaya Patil from comment #11)
> May I know if Binutils-2.31 is also affected and requires this fix? Any
> heads up will be appreciated.
Yes it is. As is 2.32 as well.
I have however updated the binutils mainline sources so version 2.33,
which is due out soon, will contain the fix.
Cheers
Nick
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From: "tromey at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/91411] New: Extraneous size & location attributes for members in DWARF
Date: Fri, 09 Aug 2019 16:14:00 -0000
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Bug ID: 91411
Summary: Extraneous size & location attributes for members in
DWARF
Product: gcc
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Consider this test case:
struct x
{
int a : 5;
int b : 2;
};
struct x x;
Compile with -g -c and then examine the DWARF.
For x::a, I get:
<2><28>: Abbrev Number: 3 (DW_TAG_member)
<29> DW_AT_name : a
<2b> DW_AT_decl_file : 1
<2c> DW_AT_decl_line : 3
<2d> DW_AT_decl_column : 7
<2e> DW_AT_type : <0x45>
<32> DW_AT_byte_size : 4
<33> DW_AT_bit_size : 5
<34> DW_AT_bit_offset : 27
<35> DW_AT_data_member_location: 0
This has two minor bugs.
First, DWARF 5 section 5.7.6 ("Data Member Entries") says:
The member entry corresponding to a data member that is defined in a structure,
union or class may have either a DW_AT_data_member_location attribute or a
DW_AT_data_bit_offset attribute.
I think that is an exclusive "or", meaning that having both attributes
is incorrect.
Second, the same section says:
If the size of a data member is not the same as the size of the type given for
the
data member, the data member has either a DW_AT_byte_size or a
DW_AT_bit_size attribute whose integer constant value (see Section 2.19 on
page 55) is the amount of storage needed to hold the value of the data member.
Again, to me this indicates that GCC should only emit one of the two
attributes.
>From gcc-bugs-return-650766-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 16:15:52 2019
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
Date: Fri, 09 Aug 2019 16:15:00 -0000
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--- Comment #20 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Author: rearnsha
Date: Fri Aug 9 16:14:59 2019
New Revision: 274238
URL: https://gcc.gnu.org/viewcvs?rev=274238&root=gcc&view=rev
Log:
[aarch64] PR target/91386 Use copy_rtx to avoid modifying original insns in
peep2 pattern
PR target/91386 is a situation where a peephole2 pattern substitution
is discarded late because the selected instructions contain
frame-related notes that we cannot redistribute (because the pattern
has more than one insn in the output). Unfortunately, the original
insns were being modified during the generation, so after the undo we
are left with corrupt RTL.
We avoid this by ensuring that the modifications are always made on a
copy, so that the original insns are never changed.
PR target/91386
* config/aarch64/aarch64.c (aarch64_gen_adjusted_ldpstp): Use copy_rtx
to preserve the contents of the original insns.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/aarch64.c
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Subject: [Bug target/91386] open-iscsi iscsiadm miscompiled by LTO on aarch64
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Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Known to fail|10.0 |
--- Comment #21 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Fixed on trunk.
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Subject: [Bug tree-optimization/90879] fold zero-equality of strcmp between a longer string and a smaller array
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |patch
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00640.html
>From gcc-bugs-return-650769-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 16:42:51 2019
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>From gcc-bugs-return-650770-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 17:11:44 2019
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Subject: [Bug target/48595] score-elf fails to build with --enable-werror-always
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--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
The score port was removed in 2014. All open bugs for it should have been
closed at that time.
>From gcc-bugs-return-650771-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 17:18:16 2019
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Subject: [Bug target/48595] score-elf fails to build with --enable-werror-always
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to joseph@codesourcery.com from comment #3)
> The score port was removed in 2014. All open bugs for it should have been
> closed at that time.
ah ok; closing this one now then.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44756
Bug 44756 depends on bug 48595, which changed state.
Bug 48595 Summary: score-elf fails to build with --enable-werror-always
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48595
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-650773-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 18:12:17 2019
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Subject: [Bug c/91398] Possible missed optimization: Can a pointer be passed as hidden pointer in x86-64 System V ABI
Date: Fri, 09 Aug 2019 18:12:00 -0000
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--- Comment #3 from ead <noone@turm-lahnstein.de> ---
Thank you for the expanations and your time!
>From gcc-bugs-return-650774-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 18:40:38 2019
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From: "clhamilto at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug go/86535] FreeBSD/PowerPC64 - Building Go Frontend support for gcc 7.3.0 fails
Date: Fri, 09 Aug 2019 18:40:00 -0000
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--- Comment #24 from Curtis Hamilton <clhamilto at gmail dot com> ---
Okay, I modified the code and got pass that issue. But have run into another
issue that has me stumped. I'm getting the below error:
/usr/ports/lang/gcc9/work/gcc-9-20190217/libgo/go/runtime/os_freebsd.go:22:9:
error: reference to undefined name 'sysctl'
22 | ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil,
0)
| ^
>From gcc-bugs-return-650775-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 18:50:00 2019
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From: "alisdairm at me dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91412] New: Unexpectedly correct raw string literal
Date: Fri, 09 Aug 2019 18:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91412
Bug ID: 91412
Summary: Unexpectedly correct raw string literal
Product: gcc
Version: 9.1.1
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Per several existing bug reports (e.g.,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38433) in phase one of
translation, when mapping source character set to basic character set, a '\'
character followed by trailing whitespace until the newline is mapped to a
single '\' character and the newline. Therefore, comments with what the author
believes to be significant trailing whitespace (e.g., to preserve ASCII art in
documentation) is mapped into a line-continuation in a comment, potentially
swallowing code in the following line.
So far, so good.
However, the following program does not follow that same mapping:
#include <iostream>
int main() {
std::cout << R"(Hello\
World!)";
}
(note that there are 3 space characters after the '\' that may get swallowed by
HTML/bugzilla)
In this case, the line-splice for '\' occurs in phase 2 of translation, and
then gets undone in phase 7. However, this does not undo the source-to-basic
character mapping in phase 1, only the splicing of a '\' immediately followed
by a newline, so there should be no whitespace following 'Hello' in the emitted
output. Yet when the program is compiled and run, three space characters are
indeed present.
Either the source-to-basic-character set mapping needs updating to further
special case trailing whitespace in what will later be determined to be a raw
string literal, or the raw literal should not contain the three spaces.
>From gcc-bugs-return-650776-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 19:49:06 2019
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Subject: [Bug go/86535] FreeBSD/PowerPC64 - Building Go Frontend support for gcc 7.3.0 fails
Date: Fri, 09 Aug 2019 19:48:00 -0000
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--- Comment #25 from Ian Lance Taylor <ian at airs dot com> ---
The code in os_freebsd.go is written for the gc toolchain. You'll need to look
at it and see whether it makes sense for gccgo.
That said, that call to sysctl does seem to make sense. You'll need to add
something like this to os_freebsd.go:
//go:noescape
//extern sysctl
func sysctl(*uint32, uint32, *byte, *uintptr, unsafe.Pointer, uintptr) int32
>From gcc-bugs-return-650777-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 20:30:42 2019
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Subject: [Bug c++/59570] Warning for semicolon trailing closing curly brackets
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
GCC already warns with -Wpedantic:
void f()
{
};
59570.C:3:2: warning: extra ‘;’ [-Wpedantic]
3 | };
| ^
>From gcc-bugs-return-650778-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 20:33:17 2019
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Subject: [Bug c++/59681] SVN 197248 adding N3582 support broke Boost.Regex with -std=c++1y
Date: Fri, 09 Aug 2019 20:33:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
$ xg++ -c 59681.C -std=c++1y
# nothing
so assuming fixed.
>From gcc-bugs-return-650779-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 20:39:31 2019
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83003] Using the detection idiom and void_t causes an error
Date: Fri, 09 Aug 2019 20:39:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This is now rejected:
$ xg++ -c 83003.C
83003.C: In substitution of ‘template<class T> using Zod_t = typename Zod::type
[with T = int]’:
83003.C:15:10: required from here
83003.C:10:26: error: no type named ‘type’ in ‘struct Zod<int>’
10 | template <class T> using Zod_t = typename Zod<T>::type;
| ^~~~~
So fixed in r270433.
>From gcc-bugs-return-650780-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 20:42:10 2019
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Subject: [Bug c++/83798] Enhancement to Wmain warnings
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
No feedback, so closing as a dup.
*** This bug has been marked as a duplicate of bug 83797 ***
>From gcc-bugs-return-650781-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 20:42:10 2019
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Subject: [Bug c++/83797] Inconsistent error messages for main
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--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
*** Bug 83798 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-650782-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 20:48:42 2019
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/71790] C++ attributes on expression statements result in compile error
Date: Fri, 09 Aug 2019 20:48:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
G++ 9+ now gives:
71790.C: In function ‘int main(int, char**)’:
71790.C:3:3: warning: attributes at the beginning of statement are ignored
[-Wattributes]
3 | [[arbitrary_attribute]]
| ^~~~~~~~~~~~~~~~~~~~~~~
>From gcc-bugs-return-650783-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 20:51:14 2019
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Subject: [Bug c++/71369] Compile failure about template function call operator
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
It compiles if I use
functor.template operator()<t>();
>From gcc-bugs-return-650784-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 21:00:40 2019
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Subject: [Bug c++/50184] Segmentation fault. Copy Constructor.
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I can't reproduce the crash anymore, assuming fixed.
>From gcc-bugs-return-650785-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 21:12:59 2019
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Subject: [Bug c++/91122] alignas gives up evaluating a constant expression in template context
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Yes. This was fixed by r272217 (trunk) and backported to gcc-9: r272219. It
is PR 90736.
>From gcc-bugs-return-650786-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 09 21:22:41 2019
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Subject: [Bug other/91396] Link error when I use -fvtable-verify=std and -static
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ctice at gcc dot gnu.org changed:
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--- Comment #4 from ctice at gcc dot gnu.org ---
I would prefer that we make it condition on !static, rather than removing it.
I will work on a patch for that.
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Subject: [Bug fortran/88072] gfortran crashes with an internal compiler error
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kargl at gcc dot gnu.org changed:
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>From gcc-bugs-return-650788-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 00:48:46 2019
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Subject: [Bug fortran/88072] gfortran crashes with an internal compiler error
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--- Comment #2 from kargl at gcc dot gnu.org ---
Patch submitted.
>From gcc-bugs-return-650789-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 02:22:30 2019
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From: "peter at cordes dot ca" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/91398] Possible missed optimization: Can a pointer be passed as hidden pointer in x86-64 System V ABI
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Peter Cordes <peter at cordes dot ca> changed:
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--- Comment #4 from Peter Cordes <peter at cordes dot ca> ---
EAD neglected to link previous discussion about this in the initial bug report.
https://stackoverflow.com/a/57377890/224132 points out that the SysV ABI
wording is
> If the type has class MEMORY, then **the caller provides space** for the return value and passes the address of this storage in %rdi
We can argue semantics, but in my answer on the same question, I argued that
the implication is that that space won't alias any other space. (Because the
return-value object exists in the C abstract machine, so the default assumption
should be that it exists for real in the calling convention.)
----
Whether it's practical to look for this optimization or not, I'm still curious
about the point that @M.M made about the semantics of restrict
https://stackoverflow.com/questions/57377314/what-prevents-the-usage-of-a-function-argument-as-hidden-pointer/57436765#comment101288442_57403379
Does the callee do_something() reading a global count as happening inside the
block scope of use(Vec3 *restrict out) { ... }? The ISO C standard wording
talks about reaching the end of a block, which hasn't happened even though
`out` is not in scope inside the other function.
If so, then calling use(&global) creates UB when *out = do_something();
executes because it writes the pointed-to memory via a restrict-pointer in the
same block where it reads it from a pointer that's not derived from out.
If so, restrict would make this optimization safe if we can prove that
do_something is "noexcept" and doesn't longjmp.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90893
--- Comment #3 from ibuclaw at gcc dot gnu.org ---
Author: ibuclaw
Date: Sat Aug 10 05:25:44 2019
New Revision: 274249
URL: https://gcc.gnu.org/viewcvs?rev=274249&root=gcc&view=rev
Log:
Fix ODR violation in d/runtime.cc
gcc/d/ChangeLog:
PR d/90893
* runtime.cc (enum libcall_type): Rename to...
(enum d_libcall_type): ...this.
(get_libcall_type): Use d_libcall_type.
(build_libcall_decl): Likewise.
Modified:
trunk/gcc/d/ChangeLog
trunk/gcc/d/runtime.cc
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Subject: [Bug d/90893] ODR violation
Date: Sat, 10 Aug 2019 05:26:00 -0000
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Iain Buclaw <ibuclaw at gdcproject dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
Fixed in r274249.
>From gcc-bugs-return-650792-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 06:01:07 2019
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From: "frankhb1989 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/66970] Add __has_builtin() macro
Date: Sat, 10 Aug 2019 06:01:00 -0000
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frankhb1989 at gmail dot com changed:
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CC| |frankhb1989 at gmail dot com
--- Comment #20 from frankhb1989 at gmail dot com ---
(In reply to Jonathan Wakely from comment #11)
> I hate that behaviour. Having to use !__is_identifier(__builtin_launder) is
> confusing (and not just to me, but to developers of LLVM's own libc++, who
> I've had to explain the problem to).
>
> But consistency with Clang is probably more important than making
> __has_builtin behave sanely.
What if breaking that insane compatibility? How does it make things worse?
`__has_builtin` is expected to be OK even with false negative results (but
surely not false positive ones). Is there any real examples showing that
relying on something like `!__has_builtin(__builtin_offsetof)` necessary for
the needs in practice?
Note that there is already no warranty by the standard with the use of `__`,
and I don't ever find reasons that things like `int __builtin_abort = 0;`
should work besides the leaked implementation details. Such abuse seems not
documented at all. Even such use is eventually guaranteed to work, the extent
should be justified by `__is_identifier`, with nothing to do with the
`__builtin_` prefix.
>From gcc-bugs-return-650793-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 07:04:10 2019
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Subject: [Bug c/91398] Possible missed optimization: Can a pointer be passed as hidden pointer in x86-64 System V ABI
Date: Sat, 10 Aug 2019 07:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91398
--- Comment #5 from rguenther at suse dot de <rguenther at suse dot de> ---
On August 10, 2019 4:22:25 AM GMT+02:00, peter at cordes dot ca
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91398
>
>Peter Cordes <peter at cordes dot ca> changed:
>
> What |Removed |Added
>----------------------------------------------------------------------------
> CC| |peter at cordes dot ca
>
>--- Comment #4 from Peter Cordes <peter at cordes dot ca> ---
>If so, restrict would make this optimization safe if we can prove that
>do_something is "noexcept" and doesn't longjmp.
Yes.
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Subject: [Bug target/91408] [10 Regression] ICE in extract_insn, at recog.c:2310 since r273981
Date: Sat, 10 Aug 2019 10:14:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Sat Aug 10 10:13:52 2019
New Revision: 274251
URL: https://gcc.gnu.org/viewcvs?rev=274251&root=gcc&view=rev
Log:
PR target/91408
* config/i386/mmx.md (usadv8qi): Use register_operand instead of
vector_operand.
* gcc.target/i386/pr91408.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr91408.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/mmx.md
trunk/gcc/testsuite/ChangeLog
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From: "jb at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/91413] New: [F2018]: Procedures are recursive by default; switching from stack to static allocation is not safe
Date: Sat, 10 Aug 2019 11:36:00 -0000
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Bug ID: 91413
Summary: [F2018]: Procedures are recursive by default;
switching from stack to static allocation is not safe
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
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As of Fortran 2018, procedures are recursive by default. However, currently
GFortran places automatic arrays larger than the limit specified by
-fmax-stack-var-size= (default 32768 bytes(?)) in static memory, which breaks
reentrancy and thread-safety. Removing this outright, in effect making
-frecursize the default, is probably not OK either as that would cause many
applications to crash due to exhausting stack space. The remaining option then
would be to switch to using heap memory rather than static memory for local
arrays going over the limit.
For a thread on this topic, see
https://gcc.gnu.org/ml/fortran/2017-12/msg00082.html
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From: "jb at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/91414] New: Improved PRNG
Date: Sat, 10 Aug 2019 11:40:00 -0000
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Bug ID: 91414
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Currently GFortran uses the xorshift1024* PRNG. The author of that PRNG has an
improved PRNG "xoshiro" at http://prng.di.unimi.it/ , described in detail at
https://arxiv.org/abs/1805.01407 . GFortran could (should?) switch to this
improved algorithm.
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Subject: [Bug d/91238] internal compiler error: in add_expr, at tree.c:7794
Date: Sat, 10 Aug 2019 14:12:00 -0000
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--- Comment #5 from ibuclaw at gcc dot gnu.org ---
Author: ibuclaw
Date: Sat Aug 10 14:11:49 2019
New Revision: 274253
URL: https://gcc.gnu.org/viewcvs?rev=274253&root=gcc&view=rev
Log:
d: Fix internal compiler error: in add_expr, at tree.c:7794
gcc/d/ChangeLog:
PR d/91238
* d-codegen.cc (build_address): If taking the address of a CALL_EXPR,
wrap it in a TARGET_EXPR.
gcc/testsuite/ChangeLog:
PR d/91238
* gdc.dg/pr91238.d: New test.
Added:
trunk/gcc/testsuite/gdc.dg/pr91238.d
Modified:
trunk/gcc/d/ChangeLog
trunk/gcc/d/d-codegen.cc
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug d/91238] internal compiler error: in add_expr, at tree.c:7794
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--- Comment #6 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
Fixed in trunk in r274253.
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From: "maxim.yegorushkin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91415] New: Invalid warning for C++17 sequencing of shift operator E1<<E2.
Date: Sat, 10 Aug 2019 14:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91415
Bug ID: 91415
Summary: Invalid warning for C++17 sequencing of shift operator
E1<<E2.
Product: gcc
Version: 8.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: maxim.yegorushkin at gmail dot com
Target Milestone: ---
When compiling the following code with g++ (Ubuntu 8.3.0-6ubuntu1~18.04.1)
8.3.0, flags -std=gnu++17 -W{all,extra,error}
int main() {
int i = 0;
int j = i++ << i++;
}
The following warning/error is produced:
test.cc:3:14: error: operation on ‘i’ may be undefined [-Werror=sequence-point]
int j = i++ << i++;
~^~
Whereas C++17 in Shift operators [expr.shift] requires that in E1 << E2 the
expression E1 is sequenced before the expression E2.
>From gcc-bugs-return-650800-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 14:57:49 2019
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Subject: [Bug c++/91415] Invalid warning for C++17 sequencing of shift operator E1<<E2.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91415
--- Comment #1 from Maxim Egorushkin <maxim.yegorushkin at gmail dot com> ---
gcc-9.1 produces the same warning.
>From gcc-bugs-return-650801-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 16:06:08 2019
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Subject: [Bug c++/91415] Invalid warning for C++17 sequencing of shift operator E1<<E2.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91415
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org,
| |mpolacek at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So shall we emit no warnings with -std=c++17 -Wsequence-point on:
struct S { int a[10]; };
void
foo (int i, int (&x)[10][10], int y[10], S z[10], S *w[10])
{
int b = x[i++][i++];
int c = i++ << i++;
int d = i++ >> i++;
int e = i++ && i++;
int f = i++ ? i++ : i++;
int g = (i++, i++);
int h = z[i++].a[i++];
int j = w[i++]->a[i++];
y[i++] = y[i++];
}
and warnings on 6 lines for -std=c++14? Right now we emit warnings on those 6
lines in both standard modes. clang 7 does the same, clang 9 emits them just
on <<, >> and assignment. + add a testcase for .* and ->* too, what else?
>From gcc-bugs-return-650802-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 16:18:08 2019
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Subject: [Bug c++/91415] Invalid warning for C++17 sequencing of shift operator E1<<E2.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91415
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/c-family/c-common.c.jj 2019-07-30 08:27:49.987555303 +0200
+++ gcc/c-family/c-common.c 2019-08-10 18:13:20.821949299 +0200
@@ -1889,6 +1889,7 @@ verify_tree (tree x, struct tlist **pbef
case COMPOUND_EXPR:
case TRUTH_ANDIF_EXPR:
case TRUTH_ORIF_EXPR:
+ sequenced_binary:
tmp_before = tmp_nosp = tmp_list2 = tmp_list3 = 0;
verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
warn_for_collisions (tmp_nosp);
@@ -2031,8 +2032,18 @@ verify_tree (tree x, struct tlist **pbef
x = TREE_OPERAND (x, 0);
goto restart;
}
- gcc_fallthrough ();
+ goto do_default;
+
+ case LSHIFT_EXPR:
+ case RSHIFT_EXPR:
+ case COMPONENT_REF:
+ case ARRAY_REF:
+ if (cxx_dialect >= cxx17)
+ goto sequenced_binary;
+ goto do_default;
+
default:
+ do_default:
/* For other expressions, simply recurse on their operands.
Manual tail recursion for unary expressions.
Other non-expressions need not be processed. */
fixes most of this, except for the assignment operator case, plus the .*/->
case isn't addressed either.
>From gcc-bugs-return-650803-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 16:37:28 2019
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Subject: [Bug c++/91415] Invalid warning for C++17 sequencing of shift operator E1<<E2.
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Testcase also with PMF:
struct S { int a[10]; void bar (); void baz (); };
typedef void (S::*pmf) ();
void
foo (int i, int x[10][10], int y[10], struct S z[10], struct S *w[10], pmf
u[10])
{
int b = x[i++][i++];
int c = i++ << i++;
int d = i++ >> i++;
int e = i++ && i++;
int f = i++ ? i++ : i++;
int g = (i++, i++);
int h = z[i++].a[i++];
int j = w[i++]->a[i++];
(z[i++].*u[i++]) ();
(w[i++]->*u[i++]) ();
y[i++] = y[i++];
}
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Subject: [Bug c++/91415] Invalid warning for C++17 sequencing of shift operator E1<<E2.
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-10
Ever confirmed|0 |1
>From gcc-bugs-return-650805-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 17:10:16 2019
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Subject: [Bug c++/91415] Invalid warning for C++17 sequencing of shift operator E1<<E2.
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--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think this is
P0145R3 Refining Expression Evaluation Order for Idiomatic C++
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0145r3.pdf
which says
4. A SOLUTION
In summary, the following expressions are evaluated in the order a, then b,
then c, then d:
1. a.b
2. a->b
3. a->*b
4. a(b1, b2, b3)
5. b @=a
6. a[b]
7. a << b
8. a >> b
>From gcc-bugs-return-650806-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 17:35:06 2019
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/91414] Improved PRNG
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P5
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-10
CC| |kargl at gcc dot gnu.org
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #1 from kargl at gcc dot gnu.org ---
I've set this to NEW, P5, enhancement request. Janne
if you're working on replacing the prng. Feel free to
ping with a patch.
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Subject: [Bug fortran/91359] logical function X returns .TRUE. - Warning: spaghetti code
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |kargl at gcc dot gnu.org
--- Comment #15 from kargl at gcc dot gnu.org ---
Take the PR. Waiting or 9-branch to open.
>From gcc-bugs-return-650808-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 18:21:44 2019
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Subject: [Bug fortran/91413] [F2018]: Procedures are recursive by default; switching from stack to static allocation is not safe
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
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CC| |tkoenig at gcc dot gnu.org
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--- Comment #1 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-650809-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 18:58:08 2019
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From: "p.vanhoof at oma dot be" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91416] New: ICE in cp_check_const_attributes, at cp/decl2.c:1408
Date: Sat, 10 Aug 2019 18:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91416
Bug ID: 91416
Summary: ICE in cp_check_const_attributes, at cp/decl2.c:1408
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: p.vanhoof at oma dot be
Target Milestone: ---
Created attachment 46698
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46698&action=edit
code that triggers the ICE
The attached code ICEs with the following build of the trunk:
% g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/local/gcc1000/lib/gcc/x86_64-pc-linux-gnu/10.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-mainline/configure --prefix=/usr/local/gcc1000
--enable-languages=c,c++,fortran
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.0.0 20190804 (experimental) (GCC)
This is r274099.
The command to trigger the ICE is:
% g++ -g -c bug.cc
The output is:
bug.cc:11:3: internal compiler error: tree check: expected tree_list, have
ggc_freed in cp_check_const_attributes, at cp/decl2.c:1408
11 | } ql;
| ^~
0x7f5a7b tree_check_failed(tree_node const*, char const*, int, char const*,
...)
../../gcc-mainline/gcc/tree.c:9905
0x61da78 tree_check(tree_node*, char const*, int, char const*, tree_code)
../../gcc-mainline/gcc/tree.h:3257
0x61da78 cp_check_const_attributes(tree_node*)
../../gcc-mainline/gcc/cp/decl2.c:1408
0x959148 cp_check_const_attributes(tree_node*)
../../gcc-mainline/gcc/cp/decl2.c:1401
0x959148 cplus_decl_attributes(tree_node**, tree_node*, int)
../../gcc-mainline/gcc/cp/decl2.c:1565
0x9489f8 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
../../gcc-mainline/gcc/cp/decl.c:5167
0x9edfbf cp_parser_init_declarator
../../gcc-mainline/gcc/cp/parser.c:20374
0x9d06ce cp_parser_simple_declaration
../../gcc-mainline/gcc/cp/parser.c:13541
0x9f4e01 cp_parser_declaration
../../gcc-mainline/gcc/cp/parser.c:13238
0x9f5580 cp_parser_translation_unit
../../gcc-mainline/gcc/cp/parser.c:4709
0x9f5580 c_parse_file()
../../gcc-mainline/gcc/cp/parser.c:41688
0xaff99b c_common_parse_file()
../../gcc-mainline/gcc/c-family/c-opts.c:1160
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
The attached code compiles correctly with g++ 9.1.0.
Unfortunately this appears to be a heisenbug. I tried generating the
preprocessed file with -save-temps, but the ICE goes away when using that file
(or even when generating the file). So I can only hope you can reproduce it
with the attached file... Let me know if there is anything else I can do.
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Subject: [Bug c++/91416] ICE in cp_check_const_attributes, at cp/decl2.c:1408
Date: Sat, 10 Aug 2019 19:01:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-10
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-650811-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 19:01:41 2019
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Subject: [Bug c++/91416] [10 Regression] ICE in cp_check_const_attributes, at cp/decl2.c:1408
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Summary|ICE in |[10 Regression] ICE in
|cp_check_const_attributes, |cp_check_const_attributes,
|at cp/decl2.c:1408 |at cp/decl2.c:1408
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Seems to be a 10 regression.
>From gcc-bugs-return-650812-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 19:09:48 2019
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Subject: [Bug c++/91416] [10 Regression] ICE in cp_check_const_attributes, at cp/decl2.c:1408
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
(In reply to p.vanhoof@oma.be from comment #0)
> Unfortunately this appears to be a heisenbug. I tried generating the
> preprocessed file with -save-temps, but the ICE goes away when using that
> file (or even when generating the file). So I can only hope you can
> reproduce it with the attached file... Let me know if there is anything else
> I can do.
--param ggc-min-expand=0 --param ggc-min-heapsize=0
can be useful when dealing with bugs like this, BTW.
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Subject: [Bug c++/91416] [10 Regression] ICE in cp_check_const_attributes, at cp/decl2.c:1408
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
__attribute__ ((unused)) const struct S {
S() { }
} s;
ICEs with --param ggc-min-expand=0 --param ggc-min-heapsize=0
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Subject: [Bug c++/91416] [10 Regression] ICE in cp_check_const_attributes, at cp/decl2.c:1408
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |10.0
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91416] ICE in cp_check_const_attributes, at cp/decl2.c:1408
Date: Sat, 10 Aug 2019 20:32:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|10.0 |---
Summary|[10 Regression] ICE in |ICE in
|cp_check_const_attributes, |cp_check_const_attributes,
|at cp/decl2.c:1408 |at cp/decl2.c:1408
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I was wrong about the regression, even r110003 crashes. So the problem is
ancient.
>From gcc-bugs-return-650816-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 20:36:45 2019
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Subject: [Bug fortran/91413] [F2018]: Procedures are recursive by default; switching from stack to static allocation is not safe
Date: Sat, 10 Aug 2019 20:36:00 -0000
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Janne Blomqvist <jb at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |https://gcc.gnu.org/ml/gcc-
| |patches/2019-08/msg00679.ht
| |ml
Assignee|unassigned at gcc dot gnu.org |jb at gcc dot gnu.org
--- Comment #2 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Patch at https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00679.html
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Subject: [Bug fortran/91414] Improved PRNG
Date: Sat, 10 Aug 2019 20:40:00 -0000
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Janne Blomqvist <jb at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Janne Blomqvist <jb at gcc dot gnu.org> ---
I have a cunning plan..
>From gcc-bugs-return-650818-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 21:17:21 2019
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Subject: [Bug middle-end/90597] [9/10 Regression] FAIL: gcc.dg/attr-vector_size.c (internal compiler error)
Date: Sat, 10 Aug 2019 21:17:00 -0000
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--- Comment #6 from John David Anglin <danglin at gcc dot gnu.org> ---
I suppose an assert could be generated to avoid running the test on hppa64,
but this is a compiler ICE and the error shouldn't occur.
>From gcc-bugs-return-650819-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 10 22:22:48 2019
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Subject: [Bug c++/91416] ICE in cp_check_const_attributes, at cp/decl2.c:1408
Date: Sat, 10 Aug 2019 22:22:00 -0000
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--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This is where we free the memory occupied by the parsed attribute:
(gdb) bt
#0 __memset_avx2_unaligned_erms () at
../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S:180
#1 0x0000000000c8e052 in poison_pages () at
/home/mpolacek/src/gcc/gcc/ggc-page.c:2112
#2 0x0000000000c8e1d6 in ggc_collect () at
/home/mpolacek/src/gcc/gcc/ggc-page.c:2207
#3 0x0000000000d66a3d in cgraph_node::finalize_function (
decl=<function_decl 0x7fffeaa7f400 __ct_base >, no_collect=false)
at /home/mpolacek/src/gcc/gcc/cgraphunit.c:492
#4 0x0000000000b47b60 in expand_or_defer_fn (fn=<function_decl 0x7fffeaa7f400
__ct_base >)
at /home/mpolacek/src/gcc/gcc/cp/semantics.c:4380
#5 0x0000000000a260d5 in maybe_clone_body (fn=<function_decl 0x7fffeaa7f200
__ct >)
at /home/mpolacek/src/gcc/gcc/cp/optimize.c:710
#6 0x0000000000b47a21 in expand_or_defer_fn_1 (fn=<function_decl
0x7fffeaa7f200 __ct >)
at /home/mpolacek/src/gcc/gcc/cp/semantics.c:4348
#7 0x0000000000b47b30 in expand_or_defer_fn (fn=<function_decl 0x7fffeaa7f200
__ct >)
at /home/mpolacek/src/gcc/gcc/cp/semantics.c:4375
#8 0x0000000000a5e3cd in cp_parser_function_definition_after_declarator
(parser=0x7fffea9527b8,
inline_p=true) at /home/mpolacek/src/gcc/gcc/cp/parser.c:28080
#9 0x0000000000a60c71 in cp_parser_late_parsing_for_member
(parser=0x7fffea9527b8,
member_function=<function_decl 0x7fffeaa7f200 __ct >) at
/home/mpolacek/src/gcc/gcc/cp/parser.c:28960
#10 0x0000000000a563a2 in cp_parser_class_specifier_1 (parser=0x7fffea9527b8)
at /home/mpolacek/src/gcc/gcc/cp/parser.c:23790
#11 0x0000000000a56473 in cp_parser_class_specifier (parser=0x7fffea9527b8)
at /home/mpolacek/src/gcc/gcc/cp/parser.c:23816
#12 0x0000000000a48f90 in cp_parser_type_specifier (parser=0x7fffea9527b8,
flags=1,
decl_specs=0x7fffffffd030, is_declaration=true,
declares_class_or_enum=0x7fffffffcfa4,
is_cv_qualifier=0x7fffffffcfa3) at
/home/mpolacek/src/gcc/gcc/cp/parser.c:17453
#13 0x0000000000a43890 in cp_parser_decl_specifier_seq (parser=0x7fffea9527b8,
flags=1,
decl_specs=0x7fffffffd030, declares_class_or_enum=0x7fffffffd02c)
at /home/mpolacek/src/gcc/gcc/cp/parser.c:14152
#14 0x0000000000a420c0 in cp_parser_simple_declaration (parser=0x7fffea9527b8,
function_definition_allowed_p=true, maybe_range_for_decl=0x0)
at /home/mpolacek/src/gcc/gcc/cp/parser.c:13447
#15 0x0000000000a42048 in cp_parser_block_declaration (parser=0x7fffea9527b8,
statement_p=false)
at /home/mpolacek/src/gcc/gcc/cp/parser.c:13394
#16 0x0000000000a41d2b in cp_parser_declaration (parser=0x7fffea9527b8)
at /home/mpolacek/src/gcc/gcc/cp/parser.c:13266
#17 0x0000000000a41e26 in cp_parser_toplevel_declaration
(parser=0x7fffea9527b8)
at /home/mpolacek/src/gcc/gcc/cp/parser.c:13295
#18 0x0000000000a2f1d5 in cp_parser_translation_unit (parser=0x7fffea9527b8)
at /home/mpolacek/src/gcc/gcc/cp/parser.c:4711
#19 0x0000000000a8863c in c_parse_file () at
/home/mpolacek/src/gcc/gcc/cp/parser.c:41855
#20 0x0000000000c467fa in c_common_parse_file () at
/home/mpolacek/src/gcc/gcc/c-family/c-opts.c:1164
#21 0x000000000140b37c in compile_file () at
/home/mpolacek/src/gcc/gcc/toplev.c:456
#22 0x000000000140e0a5 in do_compile () at
/home/mpolacek/src/gcc/gcc/toplev.c:2190
#23 0x000000000140e398 in toplev::main (this=0x7fffffffd3be, argc=7,
argv=0x7fffffffd4b8)
at /home/mpolacek/src/gcc/gcc/toplev.c:2325
#24 0x000000000232855a in main (argc=7, argv=0x7fffffffd4b8) at
/home/mpolacek/src/gcc/gcc/main.c:39
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Subject: [Bug target/87438] ICE building gfortran for MicroBlaze target
Date: Sat, 10 Aug 2019 22:38:00 -0000
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--- Comment #1 from Zach van Rijn <me at zv dot io> ---
Created attachment 46699
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46699&action=edit
Test case. Triggers bug on 8.x to at least 10-20190721.
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Subject: [Bug target/87438] ICE building gfortran for MicroBlaze target
Date: Sat, 10 Aug 2019 22:40:00 -0000
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--- Comment #2 from Zach van Rijn <me at zv dot io> ---
Using GCC 8-20180706 snapshot,
gcc -c -O2 -fPIC grapes.c
during RTL pass: reload
grapes.c: In function 'smaxval_r8':
grapes.c:57:1: internal compiler error: in gen_reg_rtx, at emit-rtl.c:1155
}
^
0x408422 gen_reg_rtx(machine_mode)
../../src_gcc/gcc/emit-rtl.c:1155
0x5e6ba6 force_reg(machine_mode, rtx_def*)
../../src_gcc/gcc/explow.c:665
0xc25604 gen_movdf(rtx_def*, rtx_def*)
../../src_gcc/gcc/config/microblaze/microblaze.md:1224
0x5fe6c5 insn_gen_fn::operator()(rtx_def*, rtx_def*) const
../../src_gcc/gcc/recog.h:301
0x5fe6c5 emit_move_insn_1(rtx_def*, rtx_def*)
../../src_gcc/gcc/expr.c:3666
0x603b45 gen_move_insn(rtx_def*, rtx_def*)
../../src_gcc/gcc/expr.c:3782
0x80e858 gen_reload
../../src_gcc/gcc/reload1.c:8740
0x8171a7 emit_input_reload_insns
../../src_gcc/gcc/reload1.c:7632
0x8171a7 do_input_reload
../../src_gcc/gcc/reload1.c:7919
0x8171a7 emit_reload_insns
../../src_gcc/gcc/reload1.c:8107
0x8171a7 reload_as_needed
../../src_gcc/gcc/reload1.c:4647
0x81ab76 reload(rtx_insn*, int)
../../src_gcc/gcc/reload1.c:1050
0x7044ea do_reload
../../src_gcc/gcc/ira.c:5477
0x7044ea execute
../../src_gcc/gcc/ira.c:5649
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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ada/91417] New: [10 regression] acats c761003 fails for powerpc targets
Date: Sun, 11 Aug 2019 00:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91417
Bug ID: 91417
Summary: [10 regression] acats c761003 fails for powerpc
targets
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ada
Assignee: unassigned at gcc dot gnu.org
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Target Milestone: ---
between r273839 and 273914 c761003 has begun to fail on powerpc (32 and 64b),
at least powerpc-darwin9 and powerpc64-linux-gnu are affected.
on powerpc64-linux-gnu:
splitting /home/iains/gcc-trunk/bld/gcc/testsuite/ada/acats2/tests/c7/c761003.a
into:
c761003_support.ads
c761003_support.adb
c761003_0.ads
c761003_1.ads
c761003_2.ads
c761003_0.adb
c761003_1.adb
c761003.adb
BUILD c761003.adb
/home/iains/gcc-trunk/bld/gcc/gnatmake
--GNATBIND=/home/iains/gcc-trunk/bld/gcc/gnatbind
--GNATLINK=/home/iains/gcc-trunk/bld/gcc/gnatlink
--GCC=/home/iains/gcc-trunk/bld/gcc/xgcc -B/home/iains/gcc-trunk/bld/gcc/ -
gnatws -O2 -gnat95
-I/home/iains/gcc-trunk/bld/gcc/testsuite/ada/acats2/../acats/support
c761003.adb -largs --GCC=/home/iains/gcc-trunk/bld/gcc/xgcc
-B/home/iains/gcc-trunk/bld/gcc/
/home/iains/gcc-trunk/bld/gcc/xgcc -c -B/home/iains/gcc-trunk/bld/gcc/ -gnatws
-O2 -gnat95
-I/home/iains/gcc-trunk/bld/gcc/testsuite/ada/acats2/../acats/support
c761003.adb
raised STORAGE_ERROR : stack overflow or erroneous memory access
gnatmake: "c761003.adb" compilation error
FAIL: c761003
on powerpc-darwin9:
/Volumes/scratch/10-5-leo/powerpc-trunk/gcc/xgcc -c
-B/Volumes/scratch/10-5-leo/powerpc-trunk/gcc/ -gnatws -O2 -gnat95
-I/Volumes/scratch/10-5-leo/powerpc-trunk/gcc/testsuite/ada/acats1/../acats/support
c761003.adb
+===========================GNAT BUG DETECTED==============================+
| 10.0.0 20190810 (experimental) [trunk revision 274249]
(powerpc-apple-darwin9) GCC error:|
| in ggc_set_mark, at ggc-page.c:1532 |
| Error detected around c761003.adb:199:5 |
| Please submit a bug report; see https://gcc.gnu.org/bugs/ . |
| Use a subject line meaningful to you and us to track the bug. |
| Include the entire contents of this bug box in the report. |
| Include the exact command that you entered. |
| Also include sources listed below. |
+==========================================================================+
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Subject: [Bug ada/91417] [10 regression] acats c761003 fails for powerpc targets
Date: Sun, 11 Aug 2019 00:12:00 -0000
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Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |powerpc*-*-*
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-08-11
Ever confirmed|0 |1
>From gcc-bugs-return-650823-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 11 00:12:27 2019
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From: "Darrell.Wright at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91418] New: Nested class of templated class cannot declare parent class friend
Date: Sun, 11 Aug 2019 00:12:00 -0000
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Bug ID: 91418
Summary: Nested class of templated class cannot declare parent
class friend
Product: gcc
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As seen here https://gcc.godbolt.org/z/FvHncw. One cannot express
friend class Parent;
when parent is templated from a nested class within a member function
As a workaround, it will work with
friend class Parent<Arg>;
>From gcc-bugs-return-650825-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 11 02:19:18 2019
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Subject: [Bug c++/91418] Nested class of templated class cannot declare parent class friend
Date: Sun, 11 Aug 2019 02:19:00 -0000
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--- Comment #1 from Darrell Wright <Darrell.Wright at gmail dot com> ---
The template isn't part of it,
https://gcc.godbolt.org/z/KCok90
>From gcc-bugs-return-650826-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 11 02:46:01 2019
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Subject: [Bug tree-optimization/91419] New: [10 Regression]: gcc.dg/tree-ssa/pr91091-2.c, ssa-fre-61.c, ssa-fre-61.c with r273232
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Bug ID: 91419
Summary: [10 Regression]: gcc.dg/tree-ssa/pr91091-2.c,
ssa-fre-61.c, ssa-fre-61.c with r273232
Product: gcc
Version: 10.0
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Target: cris-elf, pru-elf, m68k-unknown-linux-gnu
Commit r273232 (of 2019-07-08) introduced these regressions for (at least)
cris-elf, pru-elf and m68k-unknown-linux-gnu:
FAIL: gcc.dg/tree-ssa/pr91091-2.c scan-tree-dump-times fre1 "x = " 1
FAIL: gcc.dg/tree-ssa/ssa-fre-61.c (test for excess errors)
FAIL: gcc.dg/tree-ssa/ssa-fre-61.c scan-tree-dump-times fre1 "Replaced \\*p" 3
FAIL: gcc.dg/tree-ssa/ssa-fre-77.c scan-tree-dump fre1 "return 1;"
For cris-elf, the "excess errors" are (from gcc.log):
Excess errors:
ssa-fre-61.c:(.text+0x16): undefined reference to `link_error'
ssa-fre-61.c:(.text+0x30): undefined reference to `link_error'
ssa-fre-61.c:(.text+0x4a): undefined reference to `link_error'
The revision is confirmed for cris-elf by own testing. For
pru-elf and m68k-unknown-linux-gnu entries before and after
r273232 on gcc-testresults@ were compared, for example:
Before:
<https://gcc.gnu.org/ml/gcc-testresults/2019-07/msg00954.html>
(Results for
10.0.020190708(experimental)[trunkrevision273226](GCC) testsuite
on pru-unknown-elf)
<https://gcc.gnu.org/ml/gcc-testresults/2019-07/msg00932.html>
(Results for 10.0.0 20190707 (experimental) [trunk revision
273184] (GCC) testsuite on m68k-unknown-linux-gnu)
After:
<https://gcc.gnu.org/ml/gcc-testresults/2019-07/msg01192.html>
(Results for
10.0.020190710(experimental)[trunkrevision273328](GCC) testsuite
on pru-unknown-elf)
<https://gcc.gnu.org/ml/gcc-testresults/2019-07/msg01052.html>
(Results for 10.0.0 20190708 (experimental) [trunk revision
273247] (GCC) testsuite on m68k-unknown-linux-gnu)
Also, more recent gcc-testresults entries confirms that the regressions
remain.
I'm guessing that some target-ABI-structure-related knob has been overlooked,
common to these targets but different to more mainstream targets. One that
seems to match that criteria is PCC_BITFIELD_TYPE_MATTERS.
FWIW, the new test ssa-fre-78.c passes.
>From gcc-bugs-return-650827-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 11 05:19:00 2019
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91416] ICE in cp_check_const_attributes, at cp/decl2.c:1408
Date: Sun, 11 Aug 2019 05:18:00 -0000
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--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This sort of problem, accidentally collecting live data, is typically fixed by
adding
++function_depth;
// whatever
--function_depth;
Here we're in cp_parser_late_parsing_for_member, which calls
start_preparsed_function (++function_depth) and then actually parses the body
using cp_parser_function_definition_after_declarator.
cp_parser_function_definition_after_declarator does
28077 /* Finish the function. */
28078 fn = finish_function (inline_p);
28079 /* Generate code for it, if necessary. */
28080 expand_or_defer_fn (fn);
and finish_function does --function_depth. Then the call to expand_or_defer_fn
triggers calling ggc_collect.
This is similar to PR c++/88180.
>From gcc-bugs-return-650828-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 11 05:20:07 2019
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Subject: [Bug c++/91416] ICE in cp_check_const_attributes, at cp/decl2.c:1408
Date: Sun, 11 Aug 2019 05:20:00 -0000
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--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This patch seems to fix the problem. It follows cp_parser_lambda_body in its
handling of function_depth.
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -28934,6 +28934,8 @@ cp_parser_late_parsing_for_member (cp_parser* parser,
tree member_function)
function_scope = current_function_decl;
if (function_scope)
push_function_context ();
+ else
+ ++function_depth;
/* Push the body of the function onto the lexer stack. */
cp_parser_push_lexer_for_tokens (parser, tokens);
@@ -28966,6 +28968,9 @@ cp_parser_late_parsing_for_member (cp_parser* parser,
tree member_function)
/* Leave the scope of the containing function. */
if (function_scope)
pop_function_context ();
+ else
+ --function_depth;
+
cp_parser_pop_lexer (parser);
}
More tomorrow...
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From: "felix.von.s at posteo dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/41492] Please ignore #! on the first line of a file
Date: Sun, 11 Aug 2019 06:14:00 -0000
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felix <felix.von.s at posteo dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |felix.von.s at posteo dot de
--- Comment #2 from felix <felix.von.s at posteo dot de> ---
Please reconsider. For one thing, this extension does not in any way interfere
with normal preprocessor syntax. For another, stripping the shebang line in an
external preprocessor introduces overhead and complications: one has to create
a temporary source file, probably insert a #line directive in the shebang
line's place, and arrange for the temporary file to be deleted when compilation
finishes. Being able to have the compiler read the file directly would make
this so much simpler.
Also, I sometimes develop small C programs by alternating between rapid
write-compile-run cycle with Tiny C Compiler and running the program though a
normal compiler to look for warnings and produce an optimised binary. Right
now, if I do this, I have to comment out or remove the shebang line when
compiling, and add it back when I want to invoke the source file directly from
the command line through TCC. This hardly stops me dead in my tracks, but is
sure irritating.
Plus, the compiler can easily keep generating a warning for erroneous shebang
lines (or for all shebang lines when -Wpedantic is in force), so the likelihood
of this feature leading to accepting erroneous code is minimal.
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Subject: [Bug d/90601] ICE: gimplification failed (gimplify.c at 13436)
Date: Sun, 11 Aug 2019 06:53:00 -0000
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--- Comment #3 from ibuclaw at gcc dot gnu.org ---
Author: ibuclaw
Date: Sun Aug 11 06:53:14 2019
New Revision: 274263
URL: https://gcc.gnu.org/viewcvs?rev=274263&root=gcc&view=rev
Log:
d: Fix ICE: gimplification failed (gimplify.c at 13436)
The expression that caused the ICE
++(a += 1.0);
The D front-end rewrites and applies implicit type conversions so the
expression gets simplified as
(int)((double) a += 1.0) += 1
The codegen pass would subsequently generate the following invalid code
(int)(double) a = (int)((double) a + 1.0) + 1
The LHS expression `(int)(double) a', represented as a FIX_TRUNC_EXPR
being what trips as it is not a valid lvalue for assignment.
While LHS casts are stripped away, convert_expr adds a double cast
because it converts the expression to its original type before
converting it to its target type. There is no valid reason why this is
done, so it has been removed.
gcc/d/ChangeLog:
PR d/90601
* d-convert.cc (convert_expr): Don't convert an expression to its
original front-end type before converting to its target type.
gcc/testsuite/ChangeLog:
PR d/90601
* gdc.dg/pr90601.d: New test.
Added:
trunk/gcc/testsuite/gdc.dg/pr90601.d
Modified:
trunk/gcc/d/ChangeLog
trunk/gcc/d/d-convert.cc
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug d/90601] ICE: gimplification failed (gimplify.c at 13436)
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Iain Buclaw <ibuclaw at gdcproject dot org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
Fixed in r274263.
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Subject: [Bug c++/91418] Nested class of templated class cannot declare parent class friend
Date: Sun, 11 Aug 2019 07:49:00 -0000
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Harald van Dijk <harald at gigawatt dot nl> changed:
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----------------------------------------------------------------------------
CC| |harald at gigawatt dot nl
--- Comment #2 from Harald van Dijk <harald at gigawatt dot nl> ---
The `auto` also is not part of it. An even simpler example:
class A {
void func();
};
void A::func() {
class B {
B() {}
friend class A;
};
B();
}
was accepted in GCC 3.4, but started getting rejected in GCC 4.0.
It works with `friend class ::A;` or `friend A;` (the latter since GCC 4.7+).
MSVC and clang do accept it with `friend class A;`, but Intel agrees with GCC.
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Subject: [Bug fortran/91414] Improved PRNG
Date: Sun, 11 Aug 2019 09:38:00 -0000
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Janne Blomqvist <jb at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |https://gcc.gnu.org/ml/gcc-
| |patches/2019-08/msg00686.ht
| |ml
--- Comment #3 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Patch at https://gcc.gnu.org/ml/gcc-patches/2019-08/msg00686.html
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Subject: [Bug fortran/91413] [F2018]: Procedures are recursive by default; switching from stack to static allocation is not safe
Date: Sun, 11 Aug 2019 09:43:00 -0000
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--- Comment #3 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Author: jb
Date: Sun Aug 11 09:42:41 2019
New Revision: 274264
URL: https://gcc.gnu.org/viewcvs?rev=274264&root=gcc&view=rev
Log:
PR fortran/91413 Generate warning when making array static
When moving a local variable from the stack to static storage, the
procedure is no longer safe to be called recursively or concurrently
from multiple threads. Thus generate a warning when this is done.
Also double the default limit for switching from stack to static.
Regtested on x86_64-pc-linux-gnu.
gcc/fortran/ChangeLog:
2019-08-11 Janne Blomqvist <jb@gcc.gnu.org>
PR fortran/91413
* invoke.texi (-fmax-stack-var-size): Document increased default.
* options.c (gfc_post_options): Increase default stack var size to
65536 bytes.
* trans-decl.c (gfc_finish_var_decl): Generate warning when local
array moved to static storage.
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/invoke.texi
trunk/gcc/fortran/options.c
trunk/gcc/fortran/trans-decl.c
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From: "ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/91376] g++.dg/lto/pr90990 FAILs with gld 2.32.51
Date: Sun, 11 Aug 2019 09:53:00 -0000
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--- Comment #13 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> ---
> (In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #11)
>> > --- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
>> > (In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #8)
>> [...]
>> >> I don't see how nm would come into play here.
>> >
>> > I thought you see the failure for all tests. Then one could use nm to
>> > identify
>> > if LTO plugin is properly loaded.
>>
>> Ok, I see.
>>
>> >> $ gld.cmd
>> >> ../../lto-wrapper -fresolution=cp_lto_pr90990_0.res -flinker-output=rel
>> >> cp_lto_pr90990_0.o
>> >> /vol/gcc/bin/gld-2.32.51: /var/tmp//ccKkavFd.lto.o: plugin needed to handle
>> >> lto object
>> >> [Leaving g++-dg-lto-pr90990-01.exe.lto_wrapper_args]
>> >> [Leaving /var/tmp//ccKkavFd.lto.o]
>> >
>> > Can you please send me the *.o files so that I can investigate them?
>>
>> Sure, attached.
>
> When using current binutils master I see:
>
> $ ~/bin/binutils/bin/nm --version
> GNU nm (GNU Binutils) 2.32.51.20190809
>
> $ ~/bin/binutils/bin/nm --plugin
> /dev/shm/objdir/lto-plugin/.libs/liblto_plugin.so.0.0.0 ccKkavFd.lto.o
> U __gxx_personality_v0
> 00000000 W _ZN1AC1Ev
> 00000000 W _ZN1AC2Ev
> U _ZN1BixEi
> 00000000 W _ZN1CclE1A
> U _ZN1D5m_fn1Ev
> 00000000 T _ZN1FC1ER1DRK1A
> 00000000 T _ZN1FC2ER1DRK1A
>
> $ ~/bin/binutils/bin/nm ccKkavFd.lto.o
> /home/marxin/bin/binutils/bin/nm: ccKkavFd.lto.o: plugin needed to handle lto
> object
> 00000001 C __gnu_lto_slim
Same here...
> So as seen, if the plugin is loaded, then I can't see the error message.
... however I *do* it from gld!
>> >> There's no nm anywhere in sight. Besides, I find it very strange that
>> >> out of hundreds if not thousends of LTO tests during this bootstrap,
>> >> only a single one shows this error. If there were a fundamental
>> >> problem, I'd expect a way larger number here.
>> >
>> > That's strange! The test-case is not special to me.
>>
>> So one would think. However, the fact that I'm not the only one seeing
>> this particular failure suggests otherwise...
>
> Can you please send me links to the test-suite reports?
I just grepped for the test name in an rsynced copy of the
gcc-testresults archive. However, there's no need for that: you can
easily reproduce the failure yourself. I've just ran a
x86_64-pc-linux-gnu bootstrap with --with-as=/path/to/gas-2.32.51
--with-ld=/path/to/gld-2.32.51 and the current testcase was the only
one that regressed.
$ gld-2.32.51 --version
GNU ld (GNU Binutils) 2.32.51.20190805
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Subject: [Bug c++/83300] Segmentation fault with template and __attribute__((vector_size (sizeof(int) * N)));
Date: Sun, 11 Aug 2019 14:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83300
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |mpolacek at gcc dot gnu.org
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--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This is fixed in gcc 8, 9, and trunk. Going to assume we won't backport to 7
at this point.
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Subject: [Bug lto/83997] ICE with alias template and attribute
Date: Sun, 11 Aug 2019 14:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83997
Bug 83997 depends on bug 83300, which changed state.
Bug 83300 Summary: Segmentation fault with template and __attribute__((vector_size (sizeof(int) * N)));
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83300
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Subject: [Bug c++/88180] [7 Regression] ICE in vec<tree_node*, va_gc, vl_embed>::quick_push(tree_node* const&)
Date: Sun, 11 Aug 2019 14:03:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Can this be closed now? I don't suppose you want to backport it to 7 now.
>From gcc-bugs-return-650839-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 11 14:05:08 2019
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Subject: [Bug c++/90108] ICE: Segmentation fault (in c_tree_chain_next)
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Jakub, do you plan to backport it to 7? If not, let's close it.
>From gcc-bugs-return-650840-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 11 14:09:51 2019
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Subject: [Bug driver/29931] following argv[0] symlink in process_command breaks symlinked-together toolchain
Date: Sun, 11 Aug 2019 14:09:00 -0000
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--- Comment #11 from Harald van Dijk <harald at gigawatt dot nl> ---
Thinking about this a bit more, the logic should probably be: pick a file known
to exist. libgcc.a could be a good candidate, but there could be better
options. Look this up twice, once following symlinks, one without. If they both
succeed, and they are the same file (comparing the dev and ino numbers after a
stat() call), do not follow symlinks. If they both succeed, and they are not
the same file, do follow symlinks. And if only one lookup succeeds, go with the
one that succeeds. (If neither succeeds, something is seriously wrong.) This is
a bit complicated, but that's because there is one case where it seems
important to me to continue following symlinks: if you have two GCC builds of
the same version (one probably containing a patch that the other doesn't),
configured exactly the same way, install the first into its configured prefix,
and the second to a custom prefix, calling the second compiler should not pick
up any bits of the first.
>From gcc-bugs-return-650841-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 11 14:12:12 2019
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Subject: [Bug c++/88180] [7 Regression] ICE in vec<tree_node*, va_gc, vl_embed>::quick_push(tree_node* const&)
Date: Sun, 11 Aug 2019 14:12:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|7.5 |8.3
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Yeah, not severe enough to backport to 7.x.
>From gcc-bugs-return-650842-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 11 14:39:06 2019
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Subject: [Bug c++/91416] ICE in cp_check_const_attributes, at cp/decl2.c:1408
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |GC, patch
Status|NEW |ASSIGNED
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--- Comment #9 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Testing went fine, will post the patch.
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From: "fink at snaggledworks dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/90834] Header and startup objects not found on macOS 10.15
Date: Sun, 11 Aug 2019 22:26:00 -0000
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fink at snaggledworks dot com changed:
What |Removed |Added
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CC| |fink at snaggledworks dot com
--- Comment #12 from fink at snaggledworks dot com ---
(In reply to Iain Sandoe from comment #11)
> (In reply to Iain Sandoe from comment #10)
> > (In reply to John Marshall from comment #9)
>
> > > This has an unfortunate side-effect that the compiler looks in the
> > > non-existent /Library/.../MacOSX.sdk/usr/local/include instead of
> > > /usr/local/include [2].
> >
> > That's an irritation, indeed.
>
> > It's possible we could work around the /usr/include/local thing relatively
> > easily, one can add un-sysrooted paths (and also compiler-relative paths).
>
> Having said this, what does clang do?
> We probably want to avoid doing things too much differently, or people's
> build systems will behave in unexpected ways with GCC c.f. clang.
>
> on a regular Xcode installation what do you get for
>
> clang -xc /dev/null -fsyntax-only -v
>
> ?
Below is from 10.15b5 with Xcode11beta.
-- 8< ---- 8< ---- 8< ----
Apple clang version 11.0.0 (clang-1100.0.32.5)
Target: x86_64-apple-darwin19.0.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
"/Library/Developer/CommandLineTools/usr/bin/clang" -cc1 -triple
x86_64-apple-macosx10.15.0 -Wdeprecated-objc-isa-usage
-Werror=deprecated-objc-isa-usage -fsyntax-only -disable-free
-disable-llvm-verifier -discard-value-names -main-file-name null
-mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim
-fno-strict-return -masm-verbose -munwind-tables -target-sdk-version=10.15
-target-cpu penryn -dwarf-column-info -debugger-tuning=lldb -ggnu-pubnames
-target-linker-version 512.1.1 -v -resource-dir
/Library/Developer/CommandLineTools/usr/lib/clang/11.0.0 -isysroot
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -I/usr/local/include
-Wno-framework-include-private-from-public -Wno-atimport-in-framework-header
-Wno-extra-semi-stmt -Wno-quoted-include-in-framework-header
-fdebug-compilation-dir /Users/nieder -ferror-limit 19 -fmessage-length 0
-stack-protector 1 -fstack-check -mdarwin-stkchk-strong-link -fblocks
-fencode-extended-block-signature -fregister-global-dtors-with-atexit
-fobjc-runtime=macosx-10.15.0 -fmax-type-align=16 -fdiagnostics-show-option -x
c /dev/null
clang -cc1 version 11.0.0 (clang-1100.0.32.5) default target
x86_64-apple-darwin19.0.0
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/local/include"
ignoring nonexistent directory
"/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:
/Library/Developer/CommandLineTools/usr/lib/clang/11.0.0/include
/Library/Developer/CommandLineTools/usr/include
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks
(framework directory)
End of search list.
-- 8< ---- 8< ---- 8< ----
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From: "harald at gigawatt dot nl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91418] Nested class of templated class cannot declare parent class friend
Date: Mon, 12 Aug 2019 02:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91418
--- Comment #3 from Harald van Dijk <harald at gigawatt dot nl> ---
I believe GCC is correct here. [class.friend]p11
(http://eel.is/c++draft/class.friend#11) specifies that `friend class A;`, with
an unqualified name, does not find the global scope class A, but makes a (never
defined) local class A a friend of B. An example that actually defines it shows
how this could be used:
class A {
public:
void func() {
class B {
B() = default;
friend class A;
};
class A {
public:
A() { B(); }
};
A();
}
};
>From gcc-bugs-return-650845-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 12 02:47:15 2019
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From: "Darrell.Wright at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91418] Nested class of templated class cannot declare parent class friend
Date: Mon, 12 Aug 2019 02:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91418
--- Comment #4 from Darrell Wright <Darrell.Wright at gmail dot com> ---
The weird part is, other than compilers don't agree, but the lookup finds it if
you put the template argument in
template<typename T>
struct A {
auto func( ) {
class B {
B( ) = default;
friend class A<T>;
};
return B( );
}
};
I don't think a local class can be a template anyways, but it does find global
A here
>From gcc-bugs-return-650846-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 12 02:47:15 2019
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From: "bmeng.cn at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91420] New: relocation truncated to fit: R_RISCV_HI20 against `.LC0' with GCC 8.2/8.3 on RISC-V
Date: Mon, 12 Aug 2019 02:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91420
Bug ID: 91420
Summary: relocation truncated to fit: R_RISCV_HI20 against
`.LC0' with GCC 8.2/8.3 on RISC-V
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bmeng.cn at gmail dot com
Target Milestone: ---
Created attachment 46700
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46700&action=edit
test case
Please use attached test case "riscv_cpp_test.c" to trigger the bug.
$ riscv64-unknown-linux-gnu-g++ -O2 riscv_cpp_test.c
/tmp/ccCpODP4.o: In function `.L0 ':
riscv_cpp_test.c:(.text.startup+0x4): relocation truncated to fit: R_RISCV_HI20
against `.LC0'
/share/toolchains/riscv/lib/gcc/riscv64-unknown-linux-gnu/8.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld:
final link failed: Symbol needs debug section which does not exist
collect2: error: ld returned 1 exit status
Workaround: using "-O0" makes the linking procedure happy.
$ riscv64-unknown-linux-gnu-g++ -O0 riscv_cpp_test.c
>From gcc-bugs-return-650847-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 12 02:48:54 2019
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Subject: [Bug c++/91420] relocation truncated to fit: R_RISCV_HI20 against `.LC0' with GCC 8.2/8.3 on RISC-V
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91420
--- Comment #1 from Bin Meng <bmeng.cn at gmail dot com> ---
Created attachment 46701
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46701&action=edit
test log of "riscv64-unknown-linux-gnu-g++ -v -save-temps -O2 riscv_cpp_test.c"
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From: Andrew Waterman <andrew@sifive.com>
Date: Mon, 12 Aug 2019 03:05:00 -0000
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Subject: Re: [Bug c++/91420] New: relocation truncated to fit: R_RISCV_HI20 against `.LC0' with GCC 8.2/8.3 on RISC-V
To: "bmeng.cn at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
Cc: gcc-bugs@gcc.gnu.org
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The RISC-V code models currently in existence place a 2 GiB limit on
the extent of the statically linked portion of a binary. Rather than
a bug, I would describe this as a limitation of the existing code
models, which we should eventually lift by introducing larger code
models.
Note that it's possible to get similar errors on other
architecture/code model combinations. Here's an example from x86-64
with the "kernel" code model:
$ g++ -mcmodel=kernel -O2 riscv_cpp_test.c
tmp/ccEm3wfH.o: In function `main':
test.c:(.text.startup+0x20): relocation truncated to fit: R_X86_64_32S
against `.LC0'
collect2: error: ld returned 1 exit status
On Sun, Aug 11, 2019 at 7:47 PM bmeng.cn at gmail dot com
<gcc-bugzilla@gcc.gnu.org> wrote:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id‘420
>
> Bug ID: 91420
> Summary: relocation truncated to fit: R_RISCV_HI20 against
> `.LC0' with GCC 8.2/8.3 on RISC-V
> Product: gcc
> Version: 8.2.0
> Status: UNCONFIRMED
> Severity: normal
> Priority: P3
> Component: c++
> Assignee: unassigned at gcc dot gnu.org
> Reporter: bmeng.cn at gmail dot com
> Target Milestone: ---
>
> Created attachment 46700
> --> https://gcc.gnu.org/bugzilla/attachment.cgi?idF700&actioníit
> test case
>
> Please use attached test case "riscv_cpp_test.c" to trigger the bug.
>
> $ riscv64-unknown-linux-gnu-g++ -O2 riscv_cpp_test.c
> /tmp/ccCpODP4.o: In function `.L0 ':
> riscv_cpp_test.c:(.text.startup+0x4): relocation truncated to fit: R_RISCV_HI20
> against `.LC0'
> /share/toolchains/riscv/lib/gcc/riscv64-unknown-linux-gnu/8.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld:
> final link failed: Symbol needs debug section which does not exist
> collect2: error: ld returned 1 exit status
>
> Workaround: using "-O0" makes the linking procedure happy.
>
> $ riscv64-unknown-linux-gnu-g++ -O0 riscv_cpp_test.c
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug libfortran/90374] Fortran 2018: Support d0.d, e0.d, es0.d, en0.d, g0.d and ew.d e0 edit descriptors for output
[not found] <bug-90374-4@http.gcc.gnu.org/bugzilla/>
2019-08-02 19:10 ` [Bug libfortran/90374] Fortran 2018: Support d0.d, e0.d, es0.d, en0.d, g0.d and ew.d e0 edit descriptors for output jvdelisle at gcc dot gnu.org
@ 2021-05-04 12:25 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-05-04 12:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90374
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |NEW
^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <bug-90374-4@http.gcc.gnu.org/bugzilla/>
2019-08-02 19:10 ` [Bug libfortran/90374] Fortran 2018: Support d0.d, e0.d, es0.d, en0.d, g0.d and ew.d e0 edit descriptors for output jvdelisle at gcc dot gnu.org
2021-05-04 12:25 ` rguenth at gcc dot gnu.org
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