http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57413
--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > Closing this bug was premature: as I've mentioned before, I've been > working on a patch to detect if the necessary support is present. Sorry, but the "mentioned before" is not part of the audit trail. Could you provide a pointer to the relevant post?
