http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55014
--- Comment #4 from SquallATF <squallatf at gmail dot com> 2012-10-24 14:06:29 UTC --- may be this bus same as http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54957 there have a path in that post can solve this bug.