http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57125 --- Comment #4 from Ryan Hill <dirtyepic at gentoo dot org> --- For 4.7, the patch in comment #1 did the trick for us. http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo/src/patchsets/gcc/4.7.3/gentoo/93_all_4.8.0_gengtype-lex_parallel_build.patch