https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87951
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org
--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #12)
> It's not a useless warning. If I call your function from comment 7 like
> this, I get undefined behaviour:
>
> CoverMyBases( Enum{2} );
>
> Your switch is undefined for this code. That's what GCC is warning you
> about. To tell GCC you will never call the function with any value except
> Enum::A or Enum::B, add
>
> default: __builtin_unreachable();
Maybe better to add it after the switch if you want to make sure that you get a
warning with -Wswitch if a new enumerator is added.
