[Bug c/30171] non-portable va_list abuse should be diagnostic

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30171

--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(this is the last bug left open blocking bug 30334, by the way)