http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59350
--- Comment #21 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- What I don't get in that in comment 8 there is a command line with a PASS and then FAIL has "prev.cmd -march=corei7 -mtune=corei7" but the two options are already in the former command line... Could you post only the command line passed to cc1plus that FAILs?