[Bug c++/87697] Casting a base class to derived gives no warning

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* [Bug c++/87697] Casting a base class to derived gives no warning
       [not found] <bug-87697-4@http.gcc.gnu.org/bugzilla/>
@ 2018-10-23 15:18 ` jynelson at email dot sc.edu
  2022-12-23 14:54 ` arthur.j.odwyer at gmail dot com
  1 sibling, 0 replies; 2+ messages in thread
From: jynelson at email dot sc.edu @ 2018-10-23 15:18 UTC (permalink / raw)
  To: gcc-bugs

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87697

--- Comment #2 from jynelson at email dot sc.edu ---
(In reply to Jonathan Wakely from comment #1)
> (In reply to jynelson from comment #0)
> > Casting a base class to a derived class gives no warning, even with -Wall
> > -Werror enabled. I've been told on IRC that this sort of cast is undefined
> > behaviour according to spec if neither class is virtual.
> 
> It has nothing to do with whether anything is virtual or not. The relevant
> standard wording is:
> 
>    If the object of type â€œcv1 Bâ€ is actually a base class subobject of an
>    object of type D, the result refers to the enclosing object of type D.
>    Otherwise, the behavior is undefined.

Found this at http://www.open-std.org/jtc1/sc22/open/n2356/expr.html, good to
know it's undefined for sure.

> 
> > If that is the
> > case, it would be nice to have a warning.
> 
> It's only possible to warn when the compiler can statically prove that the
> pointer really isn't pointing to a derived. That's possible in your example
> because it was created right there by the 'new c1' expression, but that is a
> very silly thing to do and surely nobody does it in real code. Generally a
> function just gets passed a pointer to a base class, and can't see its
> construction, so can't tell if the cast is valid or not.

I would argue the compiler is in the best place to statically prove an invalid
downcast,
since it knows the types of every object. I'm not sure how functions relate to
this,
but if it's easier to go by a function's type signature, I think it would be
better
to warn on *any* downcast, and make the developer specifically override that
warning.
Part of the reason I opened the bug is I didn't know this was illegal at first.

> 
> > If that isn't the case, there are several more questions that arise, like
> > `why does c1 have access to c2` and `why can the const value c2::x be
> > accessed without be initialized`?
> 
> It doesn't, because there's no c2 object constructed. Obviously the code is
> silly and broken.

Of course it's silly and broken, it's an example.
In a larger project, where there's an intermediary object defined many lines
away
from this assignment, it would be much easier for this to slip by even with
code review
on the assumption that the original was the correct class.
something like this:

```
c1 original;
// ... a bunch of code ...
// looks reasonable
derived *obj = static_cast<derived*>( &original );
```

This is exacerbated by static cast never giving a warning.
This is OK for integers and floats where downcasts are well-defined,
but for undefined behaviour there should at least be a warning.

I would actually argue it should be an error, the same way
casting completely different types is an error
(https://stackoverflow.com/questions/14380275).
I'll attach some code that compiles (except for the error) as an example.

> 
> I don't think a compiler warning would be worthwhile, because it would only
> warn about code which is obviously wrong by inspection i.e. which should be
> caught by the most cursory code review.

I disagree that that it would have to be cursory.

> The general case can be diagnosed through runtime instrumentation but
> -fsanitize=undefined only gives a runtime error for an invalid static_cast
> involving polymorphic types (because the type identification is linked to
> the vtable).
> 
> -fsanitize=address does diagnose that accessing members of c2 performs an
> out-of-bounds read:
> 

This is useful, but a little obscure, I doubt it's widely used.
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From: "jynelson at email dot sc.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87697] Casting a base class to derived gives no warning
Date: Tue, 23 Oct 2018 15:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87697

--- Comment #3 from jynelson at email dot sc.edu ---
Created attachment 44884
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44884&action=edit
Casting unrelated types gives an error
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Subject: [Bug libstdc++/87704] [6/7/8/9 Regression] unique_ptr<T>(nullptr_t) requires T to be complete
Date: Tue, 23 Oct 2018 15:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87704

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue Oct 23 15:29:03 2018
New Revision: 265428

URL: https://gcc.gnu.org/viewcvs?rev=265428&root=gcc&view=rev
Log:
PR libstdc++/87704 fix unique_ptr(nullptr_t) constructors

Using a delegating constructor to implement these constructors means
that they instantiate the destructor, which requires the element_type to
be complete. In C++11 and C++14 they were specified to be delegating,
but that was changed as part of LWG 2801 so in C++17 they don't require
a complete type (as was intended all along).

        PR libstdc++/87704
        * include/bits/unique_ptr.h (unique_ptr::unique_ptr(nullptr_t)): Do
        not delegate to default constructor.
        (unique_ptr<T[], D>::unique_ptr(nullptr_t)): Likewise.
        * testsuite/20_util/unique_ptr/cons/incomplete.cc: New test.

Added:
   
branches/gcc-8-branch/libstdc++-v3/testsuite/20_util/unique_ptr/cons/incomplete.cc
Modified:
    branches/gcc-8-branch/libstdc++-v3/ChangeLog
    branches/gcc-8-branch/libstdc++-v3/include/bits/unique_ptr.h
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Subject: [Bug libstdc++/87527] uniform_real_distribution can't generate the full range of finite floating point numbers
Date: Tue, 23 Oct 2018 15:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87527

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
$ g++ -D_GLIBCXX_ASSERTIONS uniform_real.cc 
$ ./a.out
a.out: uniform_real.cc:13: int main(): Assertion `x >= low && x < high' failed.
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Subject: [Bug libstdc++/87527] uniform_real_distribution can't generate the full range of finite floating point numbers
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87527

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Oh sorry, you provided that message yourself. That assertion is there to
enforce the precondition you found.
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Subject: [Bug c/87710] New: Explicitly mentioned libraries by -lx are not in the DT_NEEDED list
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87710

            Bug ID: 87710
           Summary: Explicitly mentioned libraries by -lx are not in the
                    DT_NEEDED list
           Product: gcc
           Version: 7.3.1
            Status: UNCONFIRMED
          Severity: normal
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          Reporter: dilyan.palauzov at aegee dot org
  Target Milestone: ---

Calling â€œmake installâ€ without DESTDIR after building libc-2.28 calls
eventually glibc-2.28/srcribts/test-installation.pl . It creates the file
test-prg7044.c with content:

#include <stdio.h>
#include <stdlib.h>
int main(void) {
  printf ("Your new glibc installation seems to be ok.\n");
  exit (0);
}

Then calls â€œgcc /src/glibc228/test-prg7044.c -lc -lBrokenLocale -lpthread
-lcrypt -ldl -lgcc_s -lnsl -lutil -lnss_dns -lnss_compat -lmvec -lresolv
-lnss_db -lm -lnss_files -lrt -lnss_hesiod -lanl -o
/src/glibc228/test-prg7044â€œ, and chechs whether â€žldd test-prg7044â€ contains
BrokenLocale.  On my system the comman above invoked with -v prints:

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/7.3.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --enable-threads=posix --enable-nls
--disable-multilib --enable-interpreter --with-system-zlib
--enable-libgcj-multifile --enable-languages=all --enable-targets=all
--with-system-unwind --without-x --with-linker-hash-style=gnu --enable-shared
--with-build-config='bootstrap-lto bootstrap-O3'
Thread model: posix
gcc version 7.3.1 20181013 (GCC) 
COLLECT_GCC_OPTIONS='-v' '-o' '/src/glibc228//test-prg7044' '-mtune=generic'
'-march=x86-64'
 /usr/local/libexec/gcc/x86_64-pc-linux-gnu/7.3.1/cc1 -quiet -v -imultiarch
x86_64-linux-gnu /src/glibc228//test-prg7044.c -quiet -dumpbase test-prg7044.c
-mtune=generic -march=x86-64 -auxbase test-prg7044 -version -o /tmp/ccDutEqy.s
GNU C11 (GCC) version 7.3.1 20181013 (x86_64-pc-linux-gnu)
        compiled by GNU C version 7.3.1 20181013, GMP version 6.1.2, MPFR
version 4.0.0, MPC version 1.1.0, isl version isl-0.19-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/include
 /usr/local/include
 /usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/include-fixed
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
GNU C11 (GCC) version 7.3.1 20181013 (x86_64-pc-linux-gnu)
        compiled by GNU C version 7.3.1 20181013, GMP version 6.1.2, MPFR
version 4.0.0, MPC version 1.1.0, isl version isl-0.19-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 8ff192ae53ef780b032a40b890e7c233
COLLECT_GCC_OPTIONS='-v' '-o' '/src/glibc228//test-prg7044' '-mtune=generic'
'-march=x86-64'

/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../x86_64-pc-linux-gnu/bin/as
-v --64 -o /tmp/ccZTddK3.o /tmp/ccDutEqy.s
GNU assembler version 2.31.51 (x86_64-pc-linux-gnu) using BFD version (GNU
Binutils) 2.31.51.20181019
COMPILER_PATH=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/7.3.1/:/usr/local/libexec/gcc/x86_64-pc-linux-gnu/7.3.1/:/usr/local/libexec/gcc/x86_64-pc-linux-gnu/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../x86_64-pc-linux-gnu/bin/
LIBRARY_PATH=/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../x86_64-linux-gnu/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../lib64/:/lib/x86_64-linux-gnu/:/lib/../lib64/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib64/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../x86_64-pc-linux-gnu/lib/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-o' '/src/glibc228//test-prg7044' '-mtune=generic'
'-march=x86-64'
 /usr/local/libexec/gcc/x86_64-pc-linux-gnu/7.3.1/collect2 -plugin
/usr/local/libexec/gcc/x86_64-pc-linux-gnu/7.3.1/liblto_plugin.so
-plugin-opt=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/7.3.1/lto-wrapper
-plugin-opt=-fresolution=/tmp/ccLuMS4y.res -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s
--eh-frame-hdr --hash-style=gnu -m elf_x86_64 -dynamic-linker
/lib64/ld-linux-x86-64.so.2 -o /src/glibc228//test-prg7044
/usr/lib/../lib64/crt1.o /usr/lib/../lib64/crti.o
/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/crtbegin.o
-L/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1
-L/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../x86_64-linux-gnu
-L/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../lib64
-L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu
-L/usr/lib/../lib64
-L/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../x86_64-pc-linux-gnu/lib
-L/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../.. /tmp/ccZTddK3.o
--no-as-needed -lc -lBrokenLocale -lpthread -lcrypt -ldl -lgcc_s -lnsl -lutil
-lnss_dns -lnss_compat -lmvec -lresolv -lnss_db -lm -lnss_files -lrt
-lnss_hesiod -lanl -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc
--as-needed -lgcc_s --no-as-needed
/usr/local/lib/gcc/x86_64-pc-linux-gnu/7.3.1/crtend.o /usr/lib/../lib64/crtn.o
COLLECT_GCC_OPTIONS='-v' '-o' '/src/glibc228//test-prg7044' '-mtune=generic'
'-march=x86-64'

and ldd test-prg prints:
        linux-vdso.so.1 (0x00007ffcb77ba000)
        libc.so.6 => /lib64/libc.so.6 (0x00007f14efb4c000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f14efb2b000)
        libgcc_s.so.1 => /usr/local/lib64/libgcc_s.so.1 (0x00007f14efb12000)
        libnss_dns.so.2 => /lib64/libnss_dns.so.2 (0x00007f14efb0b000)
        libnss_compat.so.2 => /lib64/libnss_compat.so.2 (0x00007f14efb00000)
        libmvec.so.1 => /lib64/libmvec.so.1 (0x00007f14efad4000)
        libnss_db.so.2 => /lib64/libnss_db.so.2 (0x00007f14efac5000)
        libnss_files.so.2 => /lib64/libnss_files.so.2 (0x00007f14efab0000)
        libnss_hesiod.so.2 => /lib64/libnss_hesiod.so.2 (0x00007f14efaaa000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f14efd20000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x00007f14efa91000)
        libm.so.6 => /lib64/libm.so.6 (0x00007f14ef912000)

Since libBrokenLocale and others are not listed by ldd, test-installation.pl
fails.

Neither -fuse-ld=gold nor -Wl,--no-as-needed do have any impact.

See also https://sourceware.org/bugzilla/show_bug.cgi?id=23807

I have binutils  2.31.51.20181019 and gcc 7.3.1 20181013.
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Subject: [Bug c++/87709] c++17 class template argument deduction not working in a very specific case
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Jonathan Wakely <redi at gcc dot gnu.org> changed:

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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirmed, reduced:

template <class T>
struct lit {
  lit(T) { }
};

template <class T>
int operator+(lit<T>, lit<T>) {
  return 0;
}

auto r2 = (lit(0)) + lit(0);



11 | auto r2 = (lit(0)) + lit(0);
   |            ^~~
ctad.cc:2:8: note: 'template<class T> struct lit' declared here
2 | struct lit {
  |        ^~~
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Subject: [Bug lto/87698] [lto] Shared library build with -ffat-lto-objects generates extra global absolute symbol relocations
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87698

--- Comment #5 from Romain Geissler <romain.geissler at amadeus dot com> ---
Reduced test case:

> cat test.c
void f() {}

> cat test2.c
void f();

void g()
{
    f();
}

> cat test.ver
{
    local: *;
};

> gcc -g -flto -ffat-lto-objects -fPIC -o test.fat-objects.o -c test.c
> gcc -g -flto -ffat-lto-objects -fPIC -o test2.fat-objects.o -c test2.c
> gcc -g -flto -ffat-lto-objects -fPIC -shared -o test.fat-objects.so test.fat-objects.o test2.fat-objects.o -Wl,-version-script=test.ver
> gcc -g -flto -fno-fat-lto-objects -fPIC -o test.slim-objects.o -c test.c
> gcc -g -flto -fno-fat-lto-objects -fPIC -o test2.slim-objects.o -c test2.c
> gcc -g -flto -fno-fat-lto-objects -fPIC -shared -o test.slim-objects.so test.slim-objects.o test2.slim-objects.o -Wl,-version-script=test.ver


> readelf -a test.fat-objects.so|grep ABS
    5: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  ABS f  <--- unexpected
symbol here
    29: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS crtstuff.c
    37: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS
    40: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS crtstuff.c
    42: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS
    77: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS

> readelf -a test.slim-objects.so|grep ABS
    29: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS crtstuff.c
    37: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS
    40: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS crtstuff.c
    42: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS
    65: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87698

--- Comment #6 from Romain Geissler <romain.geissler at amadeus dot com> ---
Versions of gcc and ld:

> gcc --version
gcc (GCC) 8.2.1 20181011
Copyright (C) 2018 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.

> ld --version
GNU ld (GNU Binutils) 2.31.1.20181011
Copyright (C) 2018 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.
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Subject: [Bug c++/86439] CTAD with deleted copy constructor fails due to deduction-guide taking by value
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Subject: [Bug c++/87709] c++17 class template argument deduction not working in a very specific case
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Oops, I missed the first line of the diagnostic. The error from trunk is:


ctad.cc:11:12: error: missing template arguments after 'lit'
11 | auto r2 = (lit(0)) + lit(0);
   |            ^~~
ctad.cc:2:8: note: 'template<class T> struct lit' declared here
2 | struct lit {
  |        ^~~
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Subject: [Bug libstdc++/87704] [6/7/8/9 Regression] unique_ptr<T>(nullptr_t) requires T to be complete
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue Oct 23 15:55:05 2018
New Revision: 265429

URL: https://gcc.gnu.org/viewcvs?rev=265429&root=gcc&view=rev
Log:
PR libstdc++/87704 fix unique_ptr(nullptr_t) constructors

Using a delegating constructor to implement these constructors means
that they instantiate the destructor, which requires the element_type to
be complete. In C++11 and C++14 they were specified to be delegating,
but that was changed as part of LWG 2801 so in C++17 they don't require
a complete type (as was intended all along).

        PR libstdc++/87704
        * include/bits/unique_ptr.h (unique_ptr::unique_ptr(nullptr_t)): Do
        not delegate to default constructor.
        (unique_ptr<T[], D>::unique_ptr(nullptr_t)): Likewise.
        * testsuite/20_util/unique_ptr/cons/incomplete.cc: New test.

Added:
   
branches/gcc-7-branch/libstdc++-v3/testsuite/20_util/unique_ptr/cons/incomplete.cc
Modified:
    branches/gcc-7-branch/libstdc++-v3/ChangeLog
    branches/gcc-7-branch/libstdc++-v3/include/bits/unique_ptr.h
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The linker is part of binutils. not gcc.
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Subject: [Bug c/87710] Explicitly mentioned libraries by -lx are not in the DT_NEEDED list
Date: Tue, 23 Oct 2018 16:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87710

--- Comment #2 from Ð”Ð¸Ð»ÑÐ½ ÐŸÐ°Ð»Ð°ÑƒÐ·Ð¾Ð² <dilyan.palauzov at aegee dot org> ---
I tried this with -fuse-ld=gold and -fuse-ld=bfd .

If you mean the problem is in both ld.bfd and ld.gold, I will report it there.
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Subject: [Bug c/87710] Explicitly mentioned libraries by -lx are not in the DT_NEEDED list
Date: Tue, 23 Oct 2018 16:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87710

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |MOVED

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
GCC has nothing to do with adding DT_NEEDED tags, the linker is responsible for
it (whether ld.bfd or ld.gold).
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Subject: [Bug c/87710] Explicitly mentioned libraries by -lx are not in the DT_NEEDED list
Date: Tue, 23 Oct 2018 16:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87710

--- Comment #4 from Ð”Ð¸Ð»ÑÐ½ ÐŸÐ°Ð»Ð°ÑƒÐ·Ð¾Ð² <dilyan.palauzov at aegee dot org> ---
Moved to 

for ld.bfd: https://sourceware.org/bugzilla/show_bug.cgi?id=23811
for ld.gold: https://sourceware.org/bugzilla/show_bug.cgi?id=23812
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Subject: [Bug fortran/40678] Using a function as variable: ICE with 4.3, accepts invalid with 4.4/4.5
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40678

G. Steinmetz <gscfq@t-online.de> changed:

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                 CC|                            |gscfq@t-online.de

--- Comment #4 from G. Steinmetz <gscfq@t-online.de> ---

No ICE with versions configured with --enable-checking=yes or =release.


$ cat z1.f90
module m
   implicit none
contains
   subroutine s
      logical :: f
      f = g !()
   end
   logical function g()
      g = .true.
   end
end


$ gfortran-9-20181021-chk -c z1.f90
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Subject: [Bug fortran/40678] Using a function as variable: ICE with 4.3, accepts invalid with 4.4/4.5
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40678

--- Comment #5 from G. Steinmetz <gscfq@t-online.de> ---


Following program compiles smoothly and runs ...
Invocations of function h need obligatoric parenthesis, and a dummy.
On the other hand, "implicit none" would force variable h to be
explicitly declared.


$ cat z2.f90
module m
   implicit none
contains
   logical function f()
      f = h
   end function
   logical function g()
      g = .not. h
   end function
   logical function h(x)
      logical, intent(in) :: x
      h = .not. x
   end function
end
program p
   use m
   print *, f()
   print *, g()  ! .not. f()
end


$ gfortran-9-20181021-chk -Wall -Wextra -fcheck=all -static-libgfortran -g
z2.f90
$ a.out
 F
 F
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Subject: [Bug fortran/49278] ICE (segfault) when combining DATA with default initialization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49278

--- Comment #18 from G. Steinmetz <gscfq@t-online.de> ---

Update and simplified a bit, ICEs down to at least version 5 :


$ cat z1.f90
module m
   type t
      sequence
      real :: a
      real :: b = 2.0
   end type
   type(t) :: z
   data z%a /3.0/
end


$ cat z2.f90
program p
   type t
      real :: a
      real :: b = 2.0
   end type
   type(t) :: z
   data z%a /3.0/
end


$ gfortran-9-20181021 -c z2.f90
z2.f90:1:0:

    1 | program p
      |
internal compiler error: Segmentation fault
0xb1c86f crash_signal
        ../../gcc/toplev.c:325
0x6ec0cd gfc_conv_structure(gfc_se*, gfc_expr*, int)
        ../../gcc/fortran/trans-expr.c:7865
0x6fca91 gfc_conv_initializer(gfc_expr*, gfc_typespec*, tree_node*, bool, bool,
bool)
        ../../gcc/fortran/trans-expr.c:7027
0x6e1647 gfc_get_symbol_decl(gfc_symbol*)
        ../../gcc/fortran/trans-decl.c:1824
0x6e3ec7 generate_local_decl
        ../../gcc/fortran/trans-decl.c:5596
0x6a80f2 do_traverse_symtree
        ../../gcc/fortran/symbol.c:4151
0x6e4fe4 generate_local_vars
        ../../gcc/fortran/trans-decl.c:5796
0x6e4fe4 gfc_generate_function_code(gfc_namespace*)
        ../../gcc/fortran/trans-decl.c:6440
0x673426 translate_all_program_units
        ../../gcc/fortran/parse.c:6125
0x673426 gfc_parse_file()
        ../../gcc/fortran/parse.c:6328
0x6ba3ff gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:204
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Subject: [Bug fortran/49278] ICE (segfault) when combining DATA with default initialization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49278

--- Comment #19 from G. Steinmetz <gscfq@t-online.de> ---

Adding a "parameter" attribute :


$ cat z8.f90
program p
   type t
      real :: a
      real :: b = 2.0
   end type
   type(t), parameter :: z = t(4.0, 5.0)
   data z%a /3.0/
end


$ cat z9.f90
program p
   type t
      real :: a
   end type
   type(t), parameter :: z = t(4.0)
   data z%a /3.0/
end


$ gfortran-9-20181021 -c z9.f90
z9.f90:7:0:

    7 | end
      |
internal compiler error: Segmentation fault
0xb1c86f crash_signal
        ../../gcc/toplev.c:325
0x6d9481 check_constant_initializer
        ../../gcc/fortran/trans-decl.c:5198
0x6d9ef4 gfc_emit_parameter_debug_info
        ../../gcc/fortran/trans-decl.c:5262
0x6a80f2 do_traverse_symtree
        ../../gcc/fortran/symbol.c:4151
0x6e53fa gfc_generate_function_code(gfc_namespace*)
        ../../gcc/fortran/trans-decl.c:6671
0x673426 translate_all_program_units
        ../../gcc/fortran/parse.c:6125
0x673426 gfc_parse_file()
        ../../gcc/fortran/parse.c:6328
0x6ba3ff gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:204


Adding "pointer" instead of "parameter" gives pr50410 comment 0.
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Subject: [Bug fortran/87711] New: ICE in gfc_trans_transfer, at fortran/trans-io.c:2676
Date: Tue, 23 Oct 2018 16:58:00 -0000
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            Bug ID: 87711
           Summary: ICE in gfc_trans_transfer, at fortran/trans-io.c:2676
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
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          Reporter: gscfq@t-online.de
  Target Milestone: ---

Affects versions down to at least 5 :


$ cat z1.f90
program p
   character(3) :: c(2) = ['abc', 'xyz']
   print *, len_trim(c, 4)
end


$ cat z2.f90
program p
   character(3) :: c(2) = ['abc', 'xyz']
   print *, len_trim(c, 8)
end


$ gfortran-9-20181021 -c z1.f90
z1.f90:3:0:

    3 |    print *, len_trim(c, 4)
      |
internal compiler error: in gfc_trans_transfer, at fortran/trans-io.c:2676
0x718686 gfc_trans_transfer(gfc_code*)
        ../../gcc/fortran/trans-io.c:2676
0x6bdbc7 trans_code
        ../../gcc/fortran/trans.c:2038
0x715dae build_dt
        ../../gcc/fortran/trans-io.c:2026
0x6bdba7 trans_code
        ../../gcc/fortran/trans.c:2010
0x6e51c4 gfc_generate_function_code(gfc_namespace*)
        ../../gcc/fortran/trans-decl.c:6505
0x673426 translate_all_program_units
        ../../gcc/fortran/parse.c:6125
0x673426 gfc_parse_file()
        ../../gcc/fortran/parse.c:6328
0x6ba3ff gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:204
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From: "mihail.zenkov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87702] [6/7/8/9 Regression] Segfault in glibc if compiled with -march=amdfam10 -O2 (x86)
Date: Tue, 23 Oct 2018 17:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87702

--- Comment #2 from Mihail Zenkov <mihail.zenkov at gmail dot com> ---
I'm not sure how to reproduce this regressions without rebuilding glibc. But I
can provide prebuilded glibc for test.

http://www.knk.uwebweb.com/glibc-segfault.tar.xz

To reproduce just unpack and run ./test.sh. You should see:

./test.sh
Regression 1
busybox               ld.so                 libc_regression_1.so 
libc_regression_2.so  test.sh
BusyBox v1.29.3 (2018-10-18 20:28:02 BY) multi-call binary.

Usage: rm [-irf] FILE...

Remove (unlink) FILEs

        -i      Always prompt before removing
        -f      Never prompt
        -R,-r   Recurse
Segmentation fault


Regression 2
busybox               ld.so                 libc_regression_1.so 
libc_regression_2.so  test.sh
Segmentation fault
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/86687] Wrong debug information for string types passed as parameters
Date: Tue, 23 Oct 2018 17:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86687

--- Comment #17 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Tue Oct 23 17:16:55 2018
New Revision: 265431

URL: https://gcc.gnu.org/viewcvs?rev=265431&root=gcc&view=rev
Log:
backport "[c++] Fix DECL_BY_REFERENCE of clone parms"

Consider test.C compiled at -O0 -g:
...
class string {
public:
  string (const char *p) { this->p = p ; }
  string (const string &s) { this->p = s.p; }

private:
  const char *p;
};

class foo {
public:
  foo (string dir_hint) {}
};

int
main (void)
{
  std::string s = "This is just a string";
  foo bar(s);
  return 0;
}
...

When parsing foo::foo, the dir_hint parameter gets a DECL_ARG_TYPE of
'struct string & restrict'.  Then during finish_struct, we call
clone_constructors_and_destructors and create clones for foo::foo, and
set the DECL_ARG_TYPE in the same way.

Later on, during finish_function, cp_genericize is called for the original
foo::foo, which sets the type of parm dir_hint to DECL_ARG_TYPE, and sets
DECL_BY_REFERENCE of dir_hint to 1.

After that, during maybe_clone_body update_cloned_parm is called with:
...
(gdb) call debug_generic_expr (parm.typed.type)
struct string & restrict
(gdb) call debug_generic_expr (cloned_parm.typed.type)
struct string
...
The type of the cloned_parm is then set to the type of parm, but
DECL_BY_REFERENCE is not set.

When doing cp_genericize for the clone later on,
TREE_ADDRESSABLE (TREE_TYPE ()) is no longer true for the updated type for
the parm, so DECL_BY_REFERENCE is not set there either.

The missing DECL_BY_REFERENCE on cloned_parm causes incorrect debug info to be
generated.

This patch fixes the problem by copying DECL_BY_REFERENCE in
update_cloned_parm.

Bootstrapped and reg-tested on x86_64.

2018-10-23  Tom de Vries  <tdevries@suse.de>

        backport from trunk:
        2018-07-31  Tom de Vries  <tdevries@suse.de>

        PR debug/86687
        * optimize.c (update_cloned_parm): Copy DECL_BY_REFERENCE.

        * g++.dg/guality/pr86687.C: New test.

Added:
    branches/gcc-6-branch/gcc/testsuite/g++.dg/guality/pr86687.C
Modified:
    branches/gcc-6-branch/gcc/cp/ChangeLog
    branches/gcc-6-branch/gcc/cp/optimize.c
    branches/gcc-6-branch/gcc/testsuite/ChangeLog
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86687

Tom de Vries <vries at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
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         Resolution|---                         |FIXED

--- Comment #18 from Tom de Vries <vries at gcc dot gnu.org> ---
patch with test-case committed to trunk, backported to release branches 6,7,8.

Marking resolved-fixed.
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Subject: [Bug c++/87699] Implement CWG 1512
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Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=81453

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
I raised bug 81453 for this against the C front end, but only to move the
warning GCC issues with -Wextra to -Wall.
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Subject: [Bug c++/87712] New: class template argument deduction fails with wrapped parentheses
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87712

            Bug ID: 87712
           Summary: class template argument deduction fails with wrapped
                    parentheses
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: barry.revzin at gmail dot com
  Target Milestone: ---

Reduced from https://stackoverflow.com/q/52950967/2069064:

template <class T>
struct lit {
    lit(T );
};

template <typename T>
void operator+(lit<T>, int);

int main() {
    auto a = lit('b');    // ok
    auto b = (lit('b'));  // ok
    lit('b') + 1;         // ok
    (lit('b')) + 1;       // error: missing template arguments after 'lit'
    (lit('b') + 1);       // ok
}
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Subject: [Bug c++/87712] class template argument deduction fails with wrapped parentheses
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:

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----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This is likely a dup of 87709.
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Subject: [Bug c++/87712] class template argument deduction fails with wrapped parentheses
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Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Looks almost identical.

*** This bug has been marked as a duplicate of bug 87709 ***
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Subject: [Bug c++/87709] c++17 class template argument deduction not working in a very specific case
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Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |barry.revzin at gmail dot com

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 87712 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-618582-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 23 17:34:36 2018
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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87702] [6/7/8/9 Regression] Segfault in glibc if compiled with -march=amdfam10 -O2 (x86)
Date: Tue, 23 Oct 2018 17:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87702

--- Comment #3 from UroÅ¡ Bizjak <ubizjak at gmail dot com> ---
(In reply to Mihail Zenkov from comment #2)
> I'm not sure how to reproduce this regressions without rebuilding glibc. But
> I can provide prebuilded glibc for test.
> 
> http://www.knk.uwebweb.com/glibc-segfault.tar.xz
> 
> To reproduce just unpack and run ./test.sh. You should see:
> 
> ./test.sh
> Regression 1
> busybox               ld.so                 libc_regression_1.so 
> libc_regression_2.so  test.sh
> BusyBox v1.29.3 (2018-10-18 20:28:02 BY) multi-call binary.
> 
> Usage: rm [-irf] FILE...
> 
> Remove (unlink) FILEs
> 
>         -i      Always prompt before removing
>         -f      Never prompt
>         -R,-r   Recurse
> Segmentation fault

This one is unaligned access in function __run_exit_handlers:

   0xf7e2404d <+173>:   je     0xf7e24050 <__run_exit_handlers+176>
   0xf7e2404f <+175>:   lock cmpxchg %ecx,(%esi)
   0xf7e24053 <+179>:   je     0xf7e2405c <__run_exit_handlers+188>
   0xf7e24055 <+181>:   lea    (%esi),%ecx
   0xf7e24057 <+183>:   call   0xf7efd6b0 <__lll_lock_wait_private>
   0xf7e2405c <+188>:   movq   0x3720(%ebp),%xmm0
=> 0xf7e24064 <+196>:   movdqa (%esp),%xmm1
   0xf7e24069 <+201>:   pxor   %xmm0,%xmm1
   0xf7e2406d <+205>:   movdqa %xmm1,%xmm0
   0xf7e24071 <+209>:   movd   %xmm0,%ecx
   0xf7e24075 <+213>:   psrlq  $0x20,%xmm0
   0xf7e2407a <+218>:   movd   %xmm0,%eax
   0xf7e2407e <+222>:   or     %ecx,%eax
   0xf7e24080 <+224>:   jne    0xf7e23ffe <__run_exit_handlers+94>

(gdb) p $esp
$1 = (void *) 0xffffc3c8

> 
> Regression 2
> busybox               ld.so                 libc_regression_1.so 
> libc_regression_2.so  test.sh
> Segmentation fault

This one is in function _IO_vfscanf_internal:

   0xf7e6fe26 <+326>:   movaps -0x5f210(%ecx),%xmm1
   0xf7e6fe2d <+333>:   movapd -0x5f280(%ecx),%xmm2
   0xf7e6fe35 <+341>:   mov    %esi,-0x5b0(%ebp)
   0xf7e6fe3b <+347>:   movl   $0x0,-0x5b4(%ebp)
=> 0xf7e6fe45 <+357>:   movaps %xmm1,-0x5e8(%ebp)
   0xf7e6fe4c <+364>:   movl   $0x0,-0x594(%ebp)
   0xf7e6fe56 <+374>:   movl   $0x0,-0x5bc(%ebp)
   0xf7e6fe60 <+384>:   movl   $0x0,-0x5c8(%ebp)

(gdb) p $ebp
$1 = (void *) 0xffffc040

So, the best way to proceed is to isolate mentioned functions and feed them
with some test data to prepare a failing runtime testcase. Please also post
preprocessed source of failing functions, so we can see where unaligned access
comes from.
>From gcc-bugs-return-618583-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 23 17:37:32 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87712] class template argument deduction fails with wrapped parentheses
Date: Tue, 23 Oct 2018 17:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87712

--- Comment #3 from Barry Revzin <barry.revzin at gmail dot com> ---
Didn't realize the OP had filed a bug report already.
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Subject: [Bug target/87702] [6/7/8/9 Regression] Segfault in glibc if compiled with -march=amdfam10 -O2 (x86)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87702

--- Comment #4 from UroÅ¡ Bizjak <ubizjak at gmail dot com> ---
(In reply to UroÅ¡ Bizjak from comment #3)
> (In reply to Mihail Zenkov from comment #2)
> > I'm not sure how to reproduce this regressions without rebuilding glibc. But
> > I can provide prebuilded glibc for test.
> > 
> > http://www.knk.uwebweb.com/glibc-segfault.tar.xz
> > 
> > To reproduce just unpack and run ./test.sh. You should see:
> > 
> > ./test.sh
> > Regression 1
> > busybox               ld.so                 libc_regression_1.so 
> > libc_regression_2.so  test.sh
> > BusyBox v1.29.3 (2018-10-18 20:28:02 BY) multi-call binary.
> > 
> > Usage: rm [-irf] FILE...
> > 
> > Remove (unlink) FILEs
> > 
> >         -i      Always prompt before removing
> >         -f      Never prompt
> >         -R,-r   Recurse
> > Segmentation fault
> 
> This one is unaligned access in function __run_exit_handlers:
> 
>    0xf7e2404d <+173>:   je     0xf7e24050 <__run_exit_handlers+176>
>    0xf7e2404f <+175>:   lock cmpxchg %ecx,(%esi)
>    0xf7e24053 <+179>:   je     0xf7e2405c <__run_exit_handlers+188>
>    0xf7e24055 <+181>:   lea    (%esi),%ecx
>    0xf7e24057 <+183>:   call   0xf7efd6b0 <__lll_lock_wait_private>
>    0xf7e2405c <+188>:   movq   0x3720(%ebp),%xmm0
> => 0xf7e24064 <+196>:   movdqa (%esp),%xmm1
>    0xf7e24069 <+201>:   pxor   %xmm0,%xmm1
>    0xf7e2406d <+205>:   movdqa %xmm1,%xmm0
>    0xf7e24071 <+209>:   movd   %xmm0,%ecx
>    0xf7e24075 <+213>:   psrlq  $0x20,%xmm0
>    0xf7e2407a <+218>:   movd   %xmm0,%eax
>    0xf7e2407e <+222>:   or     %ecx,%eax
>    0xf7e24080 <+224>:   jne    0xf7e23ffe <__run_exit_handlers+94>
> 
> (gdb) p $esp
> $1 = (void *) 0xffffc3c8

Program received signal SIGSEGV, Segmentation fault.
0xf7e24064 in __run_exit_handlers (status=1, listp=0xf7fca3fc <__exit_funcs>,
run_list_atexit=true, run_dtors=true)
    at exit.c:114
warning: Source file is more recent than executable.
114               if (__glibc_unlikely (new_exitfn_called !=
__new_exitfn_called))

(gdb) list
109                   break;
110                 }
111               /* Re-lock again before looking at global state.  */
112               __libc_lock_lock (__exit_funcs_lock);
113
114               if (__glibc_unlikely (new_exitfn_called !=
__new_exitfn_called))
115                 /* The last exit function, or another thread, has
registered
116                    more exit functions.  Start the loop over.  */
117                 goto restart;
118             }

> 
> > 
> > Regression 2
> > busybox               ld.so                 libc_regression_1.so 
> > libc_regression_2.so  test.sh
> > Segmentation fault
> 
> This one is in function _IO_vfscanf_internal:
> 
>    0xf7e6fe26 <+326>:   movaps -0x5f210(%ecx),%xmm1
>    0xf7e6fe2d <+333>:   movapd -0x5f280(%ecx),%xmm2
>    0xf7e6fe35 <+341>:   mov    %esi,-0x5b0(%ebp)
>    0xf7e6fe3b <+347>:   movl   $0x0,-0x5b4(%ebp)
> => 0xf7e6fe45 <+357>:   movaps %xmm1,-0x5e8(%ebp)
>    0xf7e6fe4c <+364>:   movl   $0x0,-0x594(%ebp)
>    0xf7e6fe56 <+374>:   movl   $0x0,-0x5bc(%ebp)
>    0xf7e6fe60 <+384>:   movl   $0x0,-0x5c8(%ebp)
> 
> (gdb) p $ebp
> $1 = (void *) 0xffffc040

Program received signal SIGSEGV, Segmentation fault.
_IO_vfscanf_internal (s=0xffffc068, format=0x80ae357
"%llu%llu%u%u%u%u%u%u%llu%llu%u%u%u%u%u%u", 
    argptr=0xffffc140
"\354\273\v\bÜ»\v\b\374\273\v\b\004\274\v\b,\274\v\b(\274\v\b\020\274\v\b\f\274\v\b\364\273\v\b\344\273\v\b",
errp=0x0) at vfscanf.c:2447
warning: Source file is more recent than executable.
2447                    *ARG (float *) = negative ? -d : d;
(gdb) list
2442              else
2443                {
2444                  float d = __strtof_internal
2445                    (char_buffer_start (&charbuf), &tw, flags & GROUP);
2446                  if (!(flags & SUPPRESS) && tw != char_buffer_start
(&charbuf))
2447                    *ARG (float *) = negative ? -d : d;
2448                }
2449
2450              if (__glibc_unlikely (tw == char_buffer_start (&charbuf)))
2451                conv_error ();
>From gcc-bugs-return-618585-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 23 18:21:05 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87633] [9 Regression] ice in compare_range_wit h_value, at vr-values.c:1702
Date: Tue, 23 Oct 2018 18:21:00 -0000
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Yury Gribov <ygribov at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #11 from Yury Gribov <ygribov at gcc dot gnu.org> ---
.
>From gcc-bugs-return-618586-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 23 18:27:39 2018
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Subject: [Bug target/87702] [6/7/8/9 Regression] Segfault in glibc if compiled with -march=amdfam10 -O2 (x86)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87702

--- Comment #5 from UroÅ¡ Bizjak <ubizjak at gmail dot com> ---
(In reply to UroÅ¡ Bizjak from comment #4)

> Program received signal SIGSEGV, Segmentation fault.
> 0xf7e24064 in __run_exit_handlers (status=1, listp=0xf7fca3fc
> <__exit_funcs>, run_list_atexit=true, run_dtors=true)
>     at exit.c:114
> warning: Source file is more recent than executable.
> 114               if (__glibc_unlikely (new_exitfn_called !=
> __new_exitfn_called))
> 
> (gdb) list
> 109                   break;
> 110                 }
> 111               /* Re-lock again before looking at global state.  */
> 112               __libc_lock_lock (__exit_funcs_lock);
> 113
> 114               if (__glibc_unlikely (new_exitfn_called !=
> __new_exitfn_called))
> 115                 /* The last exit function, or another thread, has
> registered
> 116                    more exit functions.  Start the loop over.  */
> 117                 goto restart;
> 118             }

Here is what happens:

   0xf7e2405c <+188>:   movq   0x3720(%ebp),%xmm0
2> 0xf7e24064 <+196>:   movdqa (%esp),%xmm1
   0xf7e24069 <+201>:   pxor   %xmm0,%xmm1
   0xf7e2406d <+205>:   movdqa %xmm1,%xmm0
   0xf7e24071 <+209>:   movd   %xmm0,%ecx
   0xf7e24075 <+213>:   psrlq  $0x20,%xmm0
   0xf7e2407a <+218>:   movd   %xmm0,%eax
   0xf7e2407e <+222>:   or     %ecx,%eax
   0xf7e24080 <+224>:   jne    0xf7e23ffe <__run_exit_handlers+94>
   0xf7e24086 <+230>:   mov    0x4(%edi),%ecx
   0xf7e24089 <+233>:   test   %ecx,%ecx
   0xf7e2408b <+235>:   je     0xf7e24110 <__run_exit_handlers+368>
   0xf7e24091 <+241>:   lea    -0x1(%ecx),%eax
   0xf7e24094 <+244>:   mov    0x3724(%ebp),%edx
   0xf7e2409a <+250>:   mov    %eax,0x4(%edi)
   0xf7e2409d <+253>:   mov    0x3720(%ebp),%eax
1> 0xf7e240a3 <+259>:   mov    %edx,0x4(%esp)
   0xf7e240a7 <+263>:   mov    %eax,(%esp)

At 1>, new_exitfn_called is copied from __new_exitfn_called to a stack
location. At point 2>, the (unaligned) location is accessed with full 128 bit
movdqa access (which seems wrong, probably movq should be emitted here).

Please provide a preprocessed source of exit.c (the file is called exit.i and
can be generated by adding --save-temps to the compile command that compiled
exit.c) from the build and the exact compile flags that produce the above
assembly.
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Subject: [Bug target/87702] [6/7/8/9 Regression] Segfault in glibc if compiled with -march=amdfam10 -O2 (x86)
Date: Tue, 23 Oct 2018 18:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87702

--- Comment #6 from UroÅ¡ Bizjak <ubizjak at gmail dot com> ---
(In reply to UroÅ¡ Bizjak from comment #4)
> Program received signal SIGSEGV, Segmentation fault.
> _IO_vfscanf_internal (s=0xffffc068, format=0x80ae357
> "%llu%llu%u%u%u%u%u%u%llu%llu%u%u%u%u%u%u", 
>     argptr=0xffffc140
> "\354\273\v\bÜ»\v\b\374\273\v\b\004\274\v\b,
> \274\v\b(\274\v\b\020\274\v\b\f\274\v\b\364\273\v\b\344\273\v\b", errp=0x0)
> at vfscanf.c:2447
> warning: Source file is more recent than executable.
> 2447                    *ARG (float *) = negative ? -d : d;
> (gdb) list
> 2442              else
> 2443                {
> 2444                  float d = __strtof_internal
> 2445                    (char_buffer_start (&charbuf), &tw, flags & GROUP);
> 2446                  if (!(flags & SUPPRESS) && tw != char_buffer_start
> (&charbuf))
> 2447                    *ARG (float *) = negative ? -d : d;
> 2448                }
> 2449
> 2450              if (__glibc_unlikely (tw == char_buffer_start (&charbuf)))
> 2451                conv_error ();

Also here, please provide preprocessed source of vfscanf.c from the build and
exact compile flags that will generate the failing assembly.
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From: "wilson at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87690] [RISCV][ABI] GCC fails to sign-extend floats passed in the lp64 ABI
Date: Tue, 23 Oct 2018 18:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87690

--- Comment #3 from Jim Wilson <wilson at gcc dot gnu.org> ---
As far as I know, combined tree builds for RISC-V have never worked.  When
using a combined tree build, configure makes assumptions about gas/ld features
instead of doing run-time gas/ld checks.  Because of our reliance on link time
optimization to reduce code size, we can't support some uses of
.uleb128/.sleb128 that expect code label differences to resolve to a constant,
since this is not a constant at assembly time for RISC-V.  The result is that
the combined tree build gas/ld feature assumptions are wrong, and the build
fails.  I haven't tried to fix this as combined tree builds are obsolete and
not recommended practice anymore.

I have been using the github riscv/riscv-gnu-toolchain for cross builds.  I use
git remote add to add in the FSF git trees I want.  You can do something like
this
    git remote add upstream git://gcc.gnu.org/git/gcc.git
    git fetch upstream
    git checkout -b upstream-trunk --track upstream/trunk
You can do the same thing with binutils using
git://sourceware.org/git/binutils-gdb.git and master instead of trunk.

Another option is to use crosstool-NG.
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Subject: [Bug c++/87713] New: single character underlined in an error message instead of the whole token
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87713

            Bug ID: 87713
           Summary: single character underlined in an error message
                    instead of the whole token
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
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Every now and then I notice a diagnostic where only a single character of a
token (identifier?) is underlined but up until now I haven't had luck
reproducing it (often times it involves macros).  The ill-formed C++ test case
below shows one situation when this happens without macros.  Note the
underlining in the second error.

$ cat t.C && gcc -S  -Wall t.C
int i = sizeof ((int));
t.C:1:18: error: expected primary-expression before â€˜intâ€™
    1 | int i = sizeof ((int));
      |                  ^~~
t.C:1:18: error: expected â€˜)â€™ before â€˜intâ€™
    1 | int i = sizeof ((int));
      |                 ~^~~
      |                  )
t.C:1:23: error: expected â€˜)â€™ before â€˜;â€™ token
    1 | int i = sizeof ((int));
      |                ~      ^
      |                       )

Other C++ compilers as well as GCC's C front end handle this more gracefully. 
They print just a single message along the lines of:

t.C:1:22: error: expected expression before â€˜)â€™ token
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^ permalink raw reply	[flat|nested] 2+ messages in thread

* [Bug c++/87697] Casting a base class to derived gives no warning
       [not found] <bug-87697-4@http.gcc.gnu.org/bugzilla/>
  2018-10-23 15:18 ` [Bug c++/87697] Casting a base class to derived gives no warning jynelson at email dot sc.edu
@ 2022-12-23 14:54 ` arthur.j.odwyer at gmail dot com
  1 sibling, 0 replies; 2+ messages in thread
From: arthur.j.odwyer at gmail dot com @ 2022-12-23 14:54 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87697

Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |arthur.j.odwyer at gmail dot com

--- Comment #4 from Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> ---
jynelson: Static-casting from Base& to Derived& is the foundation of the
"Curiously Recurring Template Pattern" in C++, and therefore can't be allowed
to trigger any diagnostic with -Wall -Wextra. (Many industry codebases build
with -Wall -Wextra, and also use the CRTP.)
*Aside* from that practical consideration, I don't think there's anything wrong
with casting from one type to another. The point of type-cast syntax is to say
"Don't worry, compiler, I know what I'm doing." If one doesn't know what one's
doing, then one shouldn't use casts at all, and just stick to the implicit
conversions. It's already an error to *implicitly convert* from Base& to
Derived&, so if you stick to implicit conversions you'll get exactly the
behavior you want.

Suggest closing this issue as NOTABUG.
But see also #96765 (for this kind of cast specifically *inside a
constructor*).

^ permalink raw reply	[flat|nested] 2+ messages in thread

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