http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51242
--- Comment #22 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-11-26 13:39:17 UTC --- I mean, with the grokbitfield tweak we obtain a behavior for Comment #1 which in terms of warnings it's just a variant of Comment #13: if we already decided that it's fine to warn when the underlying type is fixed for Comment #13, we have in my opinion to consistently warn for Comment #1.