http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29467
--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-04-23 21:22:38 UTC --- I'd say it's a quality-of-implementation issue, but it probably would be best to diagnose this. I've added such diagnostics for C11 keywords such as _Noreturn and _Static_assert outside C11 mode when adding support for those keywords, for example.
