[Bug c/79732] New: ICE in set_ssa_default_def, at tree-dfa.c:327

["gerhard dot steinmetz dot fortran at t-online dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79732

            Bug ID: 79732
           Summary: ICE in set_ssa_default_def, at tree-dfa.c:327
           Product: gcc
           Version: 7.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gerhard.steinmetz.fortran@t-online.de
  Target Milestone: ---

With a mismatch (int/void), down to at least 4.8,
at -Os, -O1 or higher. No ICE seen with 4.9 :


$ cat z1.c
int bar () __attribute__ ((alias ("foo")));
void foo () { }
int main () { return bar(); }


$ gcc-7-20170226 -O2 -c z1.c
z1.c: In function 'main':
z1.c:3:22: internal compiler error: Segmentation fault
 int main () { return bar(); }
                      ^~~~~
0xbf9f9f crash_signal
        ../../gcc/toplev.c:337
0xc4fe42 set_ssa_default_def(function*, tree_node*, tree_node*)
        ../../gcc/tree-dfa.c:327
0xc7e012 expand_call_inline
        ../../gcc/tree-inline.c:4790
0xc7f4a4 gimple_expand_calls_inline
        ../../gcc/tree-inline.c:4868
0xc7f4a4 optimize_inline_calls(tree_node*)
        ../../gcc/tree-inline.c:5008
0x1328d91 early_inliner(function*)
        ../../gcc/ipa-inline.c:2721