[Bug c/117059] Enhancement: Make -Wzero-as-null-pointer-constant available in C

[jsm28 at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117059

--- Comment #11 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
This does not currently warn about zero of enum, bool or _BitInt type except in
contexts where integer promotions result in bool being promoted to int before
the diagnostic applies.