http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54162
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-08-02 23:23:19 UTC --- On Thu, 2 Aug 2012, josh at joshtriplett dot org wrote: > C1X, and numerous other compilers, support static anonymous unions or structs > at file scope. For example, the following code should work with a C1X > compiler: No it shouldn't. Anonymous structures and unions are *members* of a containing structure or union, not declarations outside such a context; see C11 6.7.2.1 paragraph 13. The constraint in 6.7 paragraph 2 applies: "A declaration other than a static_assert declaration shall declare at least a declarator (other than the parameters of a function or the members of a structure or union), a tag, or the members of an enumeration.". Your union declares none of those.
