http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55742
--- Comment #18 from davidxl <xinliangli at gmail dot com> 2013-01-14 20:17:45 UTC --- All target attributes on decls not tagged with 'mv' attribute should be merged into the default definition. Any decl tagged with 'mv' should be treated as a new decl. David