[Bug middle-end/57500] [4.9 Regression] Segfault in ipa_record_reference

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57500

--- Comment #6 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
OK, the problem here is that the symbol is not created yet, but decl exists.
Why it happens with -g only is bit strange. The following should fix it however
Index: cgraphunit.c
===================================================================
--- cgraphunit.c        (revision 199591)
+++ cgraphunit.c        (working copy)
@@ -656,8 +656,11 @@ cgraph_process_same_body_aliases (void)
   symtab_node node;
   FOR_EACH_SYMBOL (node)
     if (node->symbol.cpp_implicit_alias && !node->symbol.analyzed)
-      symtab_resolve_alias (node,
-                           symtab_get_node (node->symbol.alias_target));
+      symtab_resolve_alias
+        (node,
+         TREE_CODE (node->symbol.alias_target) == VAR_DECL
+         ? (symtab_node)varpool_node_for_decl (node->symbol.alias_target)
+         : (symtab_node)cgraph_get_create_node (node->symbol.alias_target));
   cpp_implicit_aliases_done = true;
 }