https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88181
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- (In reply to Jan Hubicka from comment #4) > It is possible that the verifier is just overzelaous here, but it seems it > really does not make sense to have packed variant of nonpacked structure and > vice versa because the memory layout is different. So i would say it is FE > bug to create non-packed variant of packed type? Yes. Probably -fpack-struct is simply broken/bit-rotten.