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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/65475] [5 Regression] ICE in odr_vtable_hasher::equal (Segmentation fault)
Date: Fri, 20 Mar 2015 08:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65475

--- Comment #3 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
The following should help:
Index: ipa-devirt.c
===================================================================
--- ipa-devirt.c        (revision 221528)
+++ ipa-devirt.c        (working copy)
@@ -1412,9 +1412,18 @@ add_type_duplicate (odr_type val, tree t
   if (!val->types_set)
     val->types_set = new hash_set<tree>;

+  /* Chose polymorphic type as leader (this happens only in case of ODR
+     violations.  */
+  if ((TREE_CODE (type) == RECORD_TYPE && TYPE_BINFO (type)
+       && polymorphic_type_binfo_p (TYPE_BINFO (type)))
+      && (TREE_CODE (val->type) != RECORD_TYPE || !TYPE_BINFO (val->type)
+          || !polymorphic_type_binfo_p (TYPE_BINFO (val->type))))
+    {
+      prevail = true;
+      build_bases = true;
+    }
   /* Always prefer complete type to be the leader.  */
-
-  if (!COMPLETE_TYPE_P (val->type) && COMPLETE_TYPE_P (type))
+  else if (!COMPLETE_TYPE_P (val->type) && COMPLETE_TYPE_P (type))
     {
       prevail = true;
       build_bases = TYPE_BINFO (type);