https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110345 --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- The fallthrough stuff is still outstanding I think and I'll have a look. part is done in r14-5561-g52eedfa00960f2d255ec542626e3531a65aa8bb8 The rest unresolved.