http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45114
--- Comment #8 from Dodji Seketeli <dodji at gcc dot gnu.org> 2011-10-27 19:18:33 UTC --- A candidate patch extending the patch attached in the first comment and allegedly implementing the feature was posted to http://gcc.gnu.org/ml/gcc-patches/2011-10/msg02494.html. If some people have self contained test cases, I'd be interested.