[Bug c/79755] New: ICE: segfault in cgraph_node::get, at cgraph.h:1261

["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=79755

            Bug ID: 79755
           Summary: ICE: segfault in cgraph_node::get, at cgraph.h:1261
           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: ---

Affects versions down to 4.9 (configured with --enable-checking=yes) :


$ cat z1.c
void foo () {}
#pragma weak foo = _foo
int _foo = 0;


$ gcc-7-20170226 -c z1.c
z1.c:1:6: error: 'foo' defined both normally and as 'alias' attribute
 void foo () {}
      ^~~
z1.c:1:6: error: 'foo' alias in between function and variable is not supported
z1.c:3:5: warning: '_foo' aliased declaration
 int _foo = 0;
     ^~~~
z1.c:1:6: internal compiler error: Segmentation fault
 void foo () {}
      ^~~
0xbf9f9f crash_signal
        ../../gcc/toplev.c:337
0x7f25e2 cgraph_node::get(tree_node const*)
        ../../gcc/cgraph.h:1261
0x7f25e2 cgraph_node::analyze()
        ../../gcc/cgraphunit.c:630
0x7f5d93 analyze_functions
        ../../gcc/cgraphunit.c:1118
0x7f68da symbol_table::finalize_compilation_unit()
        ../../gcc/cgraphunit.c:2599