https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85391
--- Comment #14 from Jan Hubicka <hubicka at gcc dot gnu.org> --- Created attachment 43947 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43947&action=edit Proposed fix We looked into this with Maritn todday. There are two bugs: one is the fact that lto.c forgets to register the type in case it was within strongly connected component after its outer type. The order depends on hash values and is not well determined. We do not want to test TYPE_CANONICAL being non-NULL. Martin is testing it. Other is the fact that Eric's last change make odr types compatible when one of them is incomplete. This is not necessarily the case. The patch should fix the ordering issue by going the slow path in case type already in hashtable is incomplete. In this case it won't take long to compare it with the other type anyway.
