https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50639
--- Comment #4 from Andi Kleen <andi-gcc at firstfloor dot org> --- I doubt it's fixed. It's a race so can be unstable. Especially since judging from the growing cc list other people keep seeing it It may not be something that gcc can fix, if anything it's more likely in make or in Linux.
