https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66027
--- Comment #9 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Actually it turns out I already fixed this on mainline. The following hunk
should be backported to GCC 5 I guess.
Index: ipa-devirt.c
===================================================================
--- ipa-devirt.c (revision 223252)
+++ ipa-devirt.c (working copy)
@@ -1536,6 +1536,7 @@ odr_types_equivalent_p (tree t1, tree t2
break;
}
case VOID_TYPE:
+ case NULLPTR_TYPE:
break;
default:
