[Bug c/54666] New: when do lto opitimizing with attribute (weak,alias), it will produce wrong code

[Bug c/54666] New: when do lto opitimizing with attribute (weak,alias), it will produce wrong code

[hcj20080469 at 163 dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54666

             Bug #: 54666
           Summary: when do lto opitimizing with attribute (weak,alias),
                    it will produce wrong code
    Classification: Unclassified
           Product: gcc
           Version: lto
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hcj20080469@163.com


gcc version is gcc4.7.1
host,build adn target is  x86 i586

test case name: weak_0.c

extern void abort(void);

int foo =0 ;

extern int bar __attribute__ ((weak,alias ("foo")));
int main(void)
{
/*      if( &foo != &bar)
        {
          abort();
        }*/
        if ( &foo != &bar)
           abort();
        return 0;
}
when compilating weaK_0.c with fllowing cmmand :
i586-target-linux-gnu-gcc weak_0.c -flto -o weak

run week

expected result: return 0;
actual   result: abort();

[Bug middle-end/54666] when do lto opitimizing with attribute (weak,alias), it will produce wrong code

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54666

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
            Version|lto                         |4.7.2
           Keywords|                            |lto, wrong-code
   Last reconfirmed|                            |2012-09-24
          Component|c                           |middle-end
                 CC|                            |hubicka at gcc dot gnu.org
     Ever Confirmed|0                           |1
      Known to fail|                            |4.7.2, 4.8.0

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-09-24 09:33:02 UTC ---
Confirmed.  4.6.x segfaults for me.

[Bug middle-end/54666] when do lto opitimizing with attribute (weak,alias), it will produce wrong code

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54666

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This was fixed for GCC 5.1.0.  The problem is the same as PR 32219 really.

[Bug middle-end/54666] when do lto opitimizing with attribute (weak,alias), it will produce wrong code

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54666

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> This was fixed for GCC 5.1.0.  The problem is the same as PR 32219 really.

That is the patch which fixes PR 32219 fixed this one.