https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65794
--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> --- (In reply to coypu from comment #4) > Hi, > > It's probably a setup/configuration issue for everyone reporting this issue. > It's hard to debug, my patch helps with figuring out the problem - but > doesn't fix it. > > I didn't ping this bug report because I don't understand what the other > patch described here does. The patch described here appears to simply add a rule to create auto-build.h from the Makefile; as Marcin said, though, it might not be correct... probably worth continuing to pursue your own patch separately...