http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54419
--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-08-31 17:16:36 UTC --- Is it clear which are the specific requirements for the various x86* targets? I'm wondering if after all it's just matter of updating: http://gcc.gnu.org/install/specific.html