[Mingw-notify] [ mingw-Bugs-2830386 ] stat produces incorrect result with w64-mingw under -O2

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Bugs item #2830386, was opened at 2009-07-31 11:54
Message generated for change (Settings changed) made by earnie
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>Category: None
>Group: 64 bit feature request
>Status: Closed
>Resolution: Invalid
Priority: 5
Private: No
Submitted By: Paul Pluzhnikov (ppluzhnikov)
Assigned to: Nobody/Anonymous (nobody)
Summary: stat produces incorrect result with w64-mingw under -O2

Initial Comment:
This is a continuation of http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40909

Test:
--- t.c ---
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>

int main(int argc, char *argv[])
{
    struct stat st;
    if (0 == stat(argv[0], &st))
        printf("mode = %x\n", st.st_mode);
    return 0;
}
--- t.c ---

Using   x86_64-w64-mingw32-gcc (GCC) 4.5.0 20090726 (experimental)
from here:
http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Automated%20Builds/mingw-w64-bin_i686-cygwin-1.5.25-15_20090726.tar.bz2/download

/usr/local/mingw-w64/bin/x86_64-w64-mingw32-gcc -g t.c -O2 && ./a.exe
mode = 0

/usr/local/mingw-w64/bin/x86_64-w64-mingw32-gcc -g t.c -O0 && ./a.exe
mode = 81ff

/usr/local/mingw-w64/bin/x86_64-w64-mingw32-gcc -g t.c -O2 -fno-strict-aliasing && ./a.exe
mode = 81ff

According to GCC developers, this:
  extern __inline__ int __attribute__((__cdecl__)) stat(const char *_Filename,struct stat *_Stat) {
   return _stat64i32(_Filename,(struct _stat64i32 *)_Stat);
is an aliasing violation.

----------------------------------------------------------------------

Comment By: Paul Pluzhnikov (ppluzhnikov)
Date: 2009-07-31 12:06

Message:
>From sezeroz at gmail dot com:

Wrong project tracker. Please go to
https://sourceforge.net/tracker/?group_id=202880 for the mingw-w64
tracker.
BTW, I worked around the issue in our svn by adding optimize("0")
attributes to
those one-line inlines for now.  Use revision 1108 and it'll be fine.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=102435&aid=2830386&group_id=2435