https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78501 --- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- Ugh, and lto does lto/lto-lang.c: ptrdiff_type_node = integer_type_node; (bogus, possibly causes wrong-code if it's ever used, make sure to remove that init as well)