https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99492
David Edelsohn <dje at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Last reconfirmed| |2021-03-10 Status|UNCONFIRMED |NEW --- Comment #2 from David Edelsohn <dje at gcc dot gnu.org> --- Confirmed. Yes, GCC does not follow the AIX ABI and places the double _Complex member at offset 8 for natural alignment instead of 4 for AIX alignment, matching the double member offset.