[Bug lto/46940] New: asm aliases with linker plugin segfaults

[Bug lto/46940] New: asm aliases with linker plugin segfaults

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46940

           Summary: asm aliases with linker plugin segfaults
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hubicka@gcc.gnu.org


extern __attribute__((visibility("hidden"))) void _moz_foo (void);
extern __typeof (_moz_foo) _moz_foo __asm__ ("" "INT__foo")
__attribute__((__visibility__("hidden"))) ;
void _moz_foo(void)
{
  printf ("blah\n");
}
extern __typeof (_moz_foo) EXT__foo __asm__("" "_moz_foo")
__attribute__((__alias__("" "INT__foo")));
evans:/abuild/jh/trunk-3/build-inst2/gcc/:[0]# more t2.c
extern void _moz_foo (void);
main()
{
  _moz_foo ();
}
evans:/abuild/jh/trunk-3/build-inst2/gcc/:[0]# ./xgcc -B ./ -O2 -flto t.c t2.c
-fuse-linker-plugin
t.c: In function ?_moz_foo?:
t.c:5:3: warning: incompatible implicit declaration of built-in function
?printf? [enabled by default]
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: ./xgcc returned 1 exit status
lto-wrapper failedcollect2: ld returned 1 exit status

The problem here is that we get prevailing definition of _moz_foo to be alias
that has no cgraph node (nor alias node) attached. Bah.

[Bug lto/46940] asm aliases with linker plugin segfaults

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46940

Jan Hubicka <hubicka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2010.12.14 16:20:51
             Blocks|45375                       |
     Ever Confirmed|0                           |1

--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-12-14 16:20:51 UTC ---
testing patch...

[Bug lto/46940] asm aliases with linker plugin segfaults

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46940

--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-12-14 23:22:27 UTC ---
Author: hubicka
Date: Tue Dec 14 23:22:23 2010
New Revision: 167822

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=167822
Log:
    PR lto/46940
    PR lto/44463
    * lto-symtab.c (lto_symtab_merge_cgraph_nodes_1): Construct nodes
    for aliases when they are used.

    * gcc.dg/lto/pr46940_0.c: New testcase.
    * gcc.dg/lto/pr46940_1.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/lto/pr46940_0.c
    trunk/gcc/testsuite/gcc.dg/lto/pr46940_1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/lto-symtab.c
    trunk/gcc/testsuite/ChangeLog

[Bug lto/46940] asm aliases with linker plugin segfaults

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46940

Jan Hubicka <hubicka at gcc dot gnu.org> changed:

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

--- Comment #3 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-12-14 23:23:11 UTC ---
Fixed.