https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114931
--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> --- Created attachment 58097 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58097&action=edit patch I am testing So I'm testing this. It definitely will "split brain" at the point the FE mucks with TYPE_CANONICAL of any existing type (and it will break an existing hash entry in the canonical type hash if it does so - looking it doesn't seem to muck with TYPE_CANONICAL of types that are possibly in the hash already though).