https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93514
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- The array is flexible array member and a2.a + 3 points to tail padding in the structure, I think it is just fine to store something in there.