https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95348
--- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> --- > Do you use it? Or do you use any of -fprofile-dir options? Ah, ok, you use it. Based on the report: -fprofile-dir=gcc_prof_dir/%p" So my recommendation would be not to use it and let GCOV run-time library merge the profiles. Of course, I'll be interested in `perf report` of such a instrumented run..