* [Bug middle-end/38358] Could not compile gcc using large include files
[not found] <bug-38358-4@http.gcc.gnu.org/bugzilla/>
@ 2015-09-17 23:42 ` manu at gcc dot gnu.org
0 siblings, 0 replies; 7+ messages in thread
From: manu at gcc dot gnu.org @ 2015-09-17 23:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38358
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |manu at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #6 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
No testcase, old report. Please reopen if this is still a problem.
>From gcc-bugs-return-497468-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 17 23:55:23 2015
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/51270] missed warning about returning reference to temporary
Date: Thu, 17 Sep 2015 23:55:00 -0000
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |manu at gcc dot gnu.org
Depends on| |60517
--- Comment #9 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #7)
> Here's a simpler testcase for the missed warning:
>
> const int& f(long l)
> {
> const int& i = l;
> return i;
> }
>
We now warn for this testcase because of the fixes in R60517.
test.cc:5:10: warning: function returns address of local variable
[-Wreturn-local-addr]
return i;
^
test.cc:4:18: note: declared here
const int& i = l;
^
I haven't tested the other testcases here, but it seems a duplicate.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60517
[Bug 60517] warning/error for taking address of member of a temporary object
>From gcc-bugs-return-497469-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 17 23:57:25 2015
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Subject: [Bug c/50476] Warn of pointer set to object whose lifetime is limited
Date: Thu, 17 Sep 2015 23:57:00 -0000
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-09-17
Depends on| |60517
Ever confirmed|0 |1
--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Possibly a duplicate of PR60517, but this testcase is slightly different (it
involves assigning to global pointer and not a return statement).
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60517
[Bug 60517] warning/error for taking address of member of a temporary object
>From gcc-bugs-return-497470-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 18 00:04:40 2015
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Subject: [Bug c/45821] no warning when returning a local variable address within a statement expression
Date: Fri, 18 Sep 2015 00:04:00 -0000
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-09-18
CC| |manu at gcc dot gnu.org
Depends on| |60517
Ever confirmed|0 |1
--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Andrew Gaul from comment #3)
> int *function_return_local(void)
> {
> int x = 0;
> return &x;
> }
>
> int *statement_expression_return_local(void)
> {
> int *y = ({
> int x = 0;
> &x;
> });
> return y;
> }
We now warn at -O2:
test.c:14:10: warning: function returns address of local variable
[-Wreturn-local-addr]
return y;
^
test.c:11:11: note: declared here
int x = 0;
^
but only because we return y. For this testcase,
int statement_expression_return_local(void)
{
int *y = ({
int x = 0;
&x;
});
return *y;
}
we get:
test.c:14:10: warning: ‘x’ is used uninitialized in this function
[-Wuninitialized]
return *y;
^
which is a bit confusing (and not the same warning).
Possibly related to 60517.
it would be good to add the testcase
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60517
[Bug 60517] warning/error for taking address of member of a temporary object
>From gcc-bugs-return-497471-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 18 00:40:42 2015
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Subject: [Bug middle-end/24786] Missing warning on questionable use of parameter to initialize static
Date: Fri, 18 Sep 2015 00:40:00 -0000
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2005-11-11 17:59:15 |2015-9-18
CC| |manu at gcc dot gnu.org
Component|c++ |middle-end
Version|4.1.0 |6.0
--- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
GCC generates code like this:
const char *names[1];
const char *blah2() {
char x = 7;
if (first_time)
names[0] = { &x };
return names[0];
}
and we end up returning:
# .MEM_1 = PHI <.MEM_4(2), .MEM_9(4), .MEM_6(3)>
[test.c:5:17] # VUSE <.MEM_1>
# PT = nonlocal escaped { D.2254 } (escaped)
_10 = [test.c:5:17] _ZZ5blah2vE5namesD.2255[0];
# .MEM_11 = VDEF <.MEM_1>
xD.2254 ={v} {CLOBBER};
[test.c:5:17] # VUSE <.MEM_11>
return _10;
;; succ: EXIT [100.0%]
While in the non-static case we propagate &x:
;; basic block 2, loop depth 0, count 0, freq 10000, maybe hot
;; prev block 0, next block 1, flags: (NEW, REACHABLE)
;; pred: ENTRY [100.0%] (FALLTHRU,EXECUTABLE)
;; starting at line 5
# .MEM_2 = VDEF <.MEM_1(D)>
xD.2254 ={v} {CLOBBER};
[test.c:5:17] # VUSE <.MEM_2>
return &xD.2254;
;; succ: EXIT [100.0%]
This seems like a missed optimization.
Somehow related to PR60517.
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Subject: [Bug c++/17729] [4.9/5/6 Regression] Duplicate __attribute__((deprecated)) warning
Date: Fri, 18 Sep 2015 01:03:00 -0000
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2006-02-01 04:38:45 |2015-9-18
--- Comment #36 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Still valid. Patch doesn't apply anymore.
test.cc:6:3: warning: ‘void func()’ is deprecated [-Wdeprecated-declarations]
func();
^
test.cc:3:6: note: declared here
void func(void) __attribute__((deprecated));
^
test.cc:6:8: warning: ‘void func()’ is deprecated [-Wdeprecated-declarations]
func();
^
test.cc:3:6: note: declared here
void func(void) __attribute__((deprecated));
^
We give one warning for "func" and another for "func()".
Breakpoint 6, warn_deprecated_use (node=node@entry=0x7ffff658bd20,
attr=<optimized out>, attr@entry=0x0) at
/home/manuel/test1/pristine/gcc/tree.c:12338
(gdb) bt
#0 warn_deprecated_use (node=node@entry=0x7ffff658bd20, attr=<optimized out>,
attr@entry=0x0) at /home/manuel/test1/pristine/gcc/tree.c:12338
#1 0x00000000006c8a69 in mark_used (decl=decl@entry=0x7ffff658bd20,
complain=complain@entry=3) at /home/manuel/test1/pristine/gcc/cp/decl2.c:5085
#2 0x00000000006c973a in mark_used (decl=decl@entry=0x7ffff658bd20) at
/home/manuel/test1/pristine/gcc/cp/decl2.c:5255
#3 0x000000000077ed79 in finish_id_expression (id_expression=0x7ffff65998f0,
decl=0x7ffff658bd20, scope=0x0, idk=0x7fffffffdc34,
integral_constant_expression_p=<optimized out>,
allow_non_integral_constant_expression_p=<optimized out>,
non_integral_constant_expression_p=0x7ffff6433a4d, template_p=false,
done=false, address_p=false, template_arg_p=false, error_msg=0x7fffffffdbc8,
location=648) at /home/manuel/test1/pristine/gcc/cp/semantics.c:3607
#4 0x00000000006e9e66 in cp_parser_primary_expression
(parser=parser@entry=0x7ffff6433a20, address_p=address_p@entry=false,
cast_p=cast_p@entry=false, template_arg_p=template_arg_p@entry=false,
decltype_p=decltype_p@entry=false, idk=idk@entry=0x7fffffffdc34) at
/home/manuel/test1/pristine/gcc/cp/parser.c:4817
#5 0x00000000006f646c in cp_parser_postfix_expression
(parser=parser@entry=0x7ffff6433a20, address_p=address_p@entry=false,
cast_p=cast_p@entry=false,
member_access_only_p=member_access_only_p@entry=false, decltype_p=false,
pidk_return=pidk_return@entry=0x0) at
/home/manuel/test1/pristine/gcc/cp/parser.c:6201
(gdb) c
Continuing.
/home/manuel/test.cc:6:3: warning: ‘void func()’ is deprecated
[-Wdeprecated-declarations]
func();
^
/home/manuel/test.cc:3:6: note: declared here
void func(void) __attribute__((deprecated));
^
Breakpoint 6, warn_deprecated_use (node=node@entry=0x7ffff658bd20,
attr=<optimized out>, attr@entry=0x0) at
/home/manuel/test1/pristine/gcc/tree.c:12338
(gdb) bt
#0 warn_deprecated_use (node=node@entry=0x7ffff658bd20, attr=<optimized out>,
attr@entry=0x0) at /home/manuel/test1/pristine/gcc/tree.c:12338
#1 0x00000000006c8a69 in mark_used (decl=decl@entry=0x7ffff658bd20,
complain=complain@entry=3) at /home/manuel/test1/pristine/gcc/cp/decl2.c:5085
#2 0x00000000005de657 in build_over_call (cand=<optimized out>, flags=1,
complain=complain@entry=3) at /home/manuel/test1/pristine/gcc/cp/call.c:7578
#3 0x00000000005ed620 in build_new_function_call (fn=fn@entry=0x7ffff658bd20,
args=args@entry=0x7fffffffdc38, koenig_p=koenig_p@entry=false,
complain=complain@entry=3) at /home/manuel/test1/pristine/gcc/cp/call.c:4136
#4 0x00000000007776bf in finish_call_expr (fn=fn@entry=0x7ffff658bd20,
args=args@entry=0x7fffffffdc38, disallow_virtual=disallow_virtual@entry=false,
koenig_p=<optimized out>, complain=3) at
/home/manuel/test1/pristine/gcc/cp/semantics.c:2391
#5 0x00000000006f651a in cp_parser_postfix_expression
(parser=parser@entry=0x7ffff6433a20, address_p=address_p@entry=false,
cast_p=cast_p@entry=false,
member_access_only_p=member_access_only_p@entry=false, decltype_p=false,
pidk_return=pidk_return@entry=0x0) at
/home/manuel/test1/pristine/gcc/cp/parser.c:6419
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgcc/66883] config/epiphany/udivsi3-float.c:52: bad if test ?
Date: Fri, 18 Sep 2015 01:13:00 -0000
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |epiphany
CC| |amylaar at gcc dot gnu.org
--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
David, you may need to CC the target maintainer for bugs in minor targets. They
do not follow gcc-bugs or peruse bugzilla.
>From gcc-bugs-return-497474-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 18 01:44:46 2015
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From: "Marco.Leise at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/53712] Does not combine unaligned load with _mm_cmpistri, redundant instruction at -O0
Date: Fri, 18 Sep 2015 01:44:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 4.6.3
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: Marco.Leise at gmx dot de
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: FIXED
X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idS712
Marco Leise <Marco.Leise at gmx dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |Marco.Leise at gmx dot de
--- Comment #9 from Marco Leise <Marco.Leise at gmx dot de> ---
If this was fixed three years ago, then how does the same test program produce
this assembly with gcc 5.2.0 (and earlier)?
Dump of assembler code for function test:
0x0000000000400596 <+0>: push rbp
0x0000000000400597 <+1>: mov rbp,rsp
0x000000000040059a <+4>: mov QWORD PTR [rbp-0x28],rdi
0x000000000040059e <+8>: mov QWORD PTR [rbp-0x30],rsi
0x00000000004005a2 <+12>: mov rax,QWORD PTR [rbp-0x30]
0x00000000004005a6 <+16>: mov QWORD PTR [rbp-0x18],rax
0x00000000004005aa <+20>: mov rax,QWORD PTR [rbp-0x18]
0x00000000004005ae <+24>: movdqu xmm0,XMMWORD PTR [rax]
0x00000000004005b2 <+28>: movaps XMMWORD PTR [rbp-0x10],xmm0
0x00000000004005b6 <+32>: mov rax,QWORD PTR [rbp-0x28]
=> 0x00000000004005ba <+36>: movdqa xmm0,XMMWORD PTR [rax]
0x00000000004005be <+40>: movdqa xmm1,xmm0
0x00000000004005c2 <+44>: movdqa xmm0,XMMWORD PTR [rbp-0x10]
0x00000000004005c7 <+49>: pcmpistri xmm0,xmm1,0x0
0x00000000004005cd <+55>: mov eax,ecx
0x00000000004005cf <+57>: pcmpistrm xmm0,xmm1,0x0
0x00000000004005d5 <+63>: pop rbp
0x00000000004005d6 <+64>: ret
gcc -v
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/5.2.0/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/5.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-5.2.0/work/gcc-5.2.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/5.2.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/5.2.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/5.2.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/5.2.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/5.2.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/5.2.0/include/g++-v5
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/5.2.0/python
--enable-languages=c,c++ --enable-obsolete --enable-secureplt --disable-werror
--with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 5.2.0 p1.1, pie-0.6.4' --enable-libstdcxx-time
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj
--enable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts
--disable-libquadmath --enable-lto --without-isl --enable-libsanitizer
Thread model: posix
gcc version 5.2.0 (Gentoo 5.2.0 p1.1, pie-0.6.4)
^ permalink raw reply [flat|nested] 7+ messages in thread