https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101352
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever confirmed|0 |1 Last reconfirmed| |2021-07-07 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- because DECL_ARG_TYPE is arg-type <integer_type 0xfffff59b05e8 int> I don't think __attribute__((vector_size)) works well outside of typedefs ... OTOH maybe it's a K&R style arg parsing issue.