http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53528
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-05-30 13:47:38 UTC --- Note that the syntactic binding of C++11 attributes is different from that of GNU attributes in various cases, so the front end will need to track separately what attributes of each syntax have been used in various places.