https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81845
--- Comment #2 from Aleksandr Slobodeniuk <alenuke at yandex dot ru> --- Sorry, I didn't really specify the standard (and mess c with c++). C11 standard. 6.8.4.2 The switch statement. > 3 The expression of each case label shall be an integer constant expression > and no two of the case constant expressions in the same switch statement > shall have the same value after conversion. So, by C11 standard case label shall be a constant expression. Fields of const-qualified structs and unions, that were initialized with const literals ARE *constant expressions*, isn't it? ----------------- Yes, the standard also says that uninitialized part of union is undefined, but that's not that case if we have fields with the same size. ----------------- Sorry for wasting your time.
