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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/46940] New: asm aliases with linker plugin segfaults
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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.