https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66367
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Chris Loonam from comment #2) > I think that being able to use `id` as an argument to va_arg is the expected > behavior, not an extension provided by the compiler. This has nothing to do with id but rather variable arguments is not being parsed as it is not supported yet. Variadic have not implemented in the objective-C front-end of GCC. And that is why it is an extension to the language.
