------- Comment #3 from jakub at gcc dot gnu dot org 2008-12-29 19:38 -------
I'd say this is invalid.
"You may specify type attributes in an enum, struct or union type
declaration or definition, or for other types in a @code{typedef}
declaration."
See PR29436.-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38611
