https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66880
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Yeah, the problem is that a case label value needs to be an integral constant expression. 0xEB << 24 contains an overflow so we weren't able to fold it, thus we emit the __builtin___ubsan_handle_shift_out_of_bounds call -- and that is rejected by the C FE later on. I'm not sure how to make this better.
