https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99105
--- Comment #11 from Martin Liška <marxin at gcc dot gnu.org> --- > Yep, this is usual profile I see. Perhaps you want to try profile "make > check" Ah, yeah, that will make a big difference. So clang is using 'make check', running a test-suite for a PGO build, right?