http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56848
--- Comment #10 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2013-04-05 22:27:22 UTC --- Apparently the automatic xref didn't work, here is the commit: http://gcc.gnu.org/ml/gcc-cvs/2013-04/msg00244.html