http://gcc.gnu.org/bugzilla/show_bug.cgi?id=7313
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-02 01:41:07 UTC --- or if it is ill-formed, it's "no diagnostic required": http://open-std.org/JTC1/SC22/WG21/docs/cwg_defects.html#564 I'm not sure whether the definitions find the same entities (and inherit their language linkage) as the extern "C" declarations.
