http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55062
--- Comment #8 from Iain Sandoe <iains at gcc dot gnu.org> 2012-10-25 13:13:12 UTC --- r192798 bootstrapped c,lto,c++,objc using apple's gcc-4.2.1 as bootstrap it is on stage3 for all languages + Ada and OjbC++ using gcc-4.7(with Ada) as botostrap. so, it looks like the problem has been resolved on trunk.