https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64593
--- Comment #3 from Jacek Sieka <arnetheduck at gmail dot com> --- I've run a few more tests, and it turns out the culprit is profiledbootstrap. 'make profiledbootstrap' fails even when bootstrap-lto is taken out from the configure line. Plain 'make' works both with and without bootstrap-lto.
