https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81443
--- Comment #2 from Joshua Kinard <kumba at gentoo dot org> --- (In reply to Richard Biener from comment #1) > What file is it compiling? As far as I can tell, it looks somewhat random. I initially thought that 'build/genrecog.o' was a single file, but after several re-runs, I noticed there's several files getting compiled that must get merged into genrecog.o. I was running a parallel build, too, though (only -j3, 2x SMP machine), so I could have been seeing the other parallel thread(s) running. I've restarted the builod where it stopped using -j1. It takes about an hour to get back to where it will stop. I'll report what that file is, and then launch it again and see if it stays consistent.