http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55203
--- Comment #5 from Lubos Lunak <l.lunak at suse dot cz> --- Gcc patch is in, r200941. Keeping open for libstdc++ to use the attribute for its relevant classes. I can try to submit a patch when I find the time, but I doubt I'll get past the most obvious classes, so anyone more knowledgeable about libstdc++ can feel free.
