http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53832
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-07-03 11:02:52 UTC --- I also saw this on x86_64-linux (gcc14 in the compile farm) ... not sure what's going on. In all cases it was a completely clean objdir. Will investigate further tonight.