https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84280
--- Comment #18 from Martin Liška <marxin at gcc dot gnu.org> --- (In reply to Patrik Huber from comment #14) > It even seems a few percent slower after the FDO stuff. But the ` > -fprofile-use` is a bit weird. If there is no .gcda file, it doesn't > complain. If you give it a file that doesn't exist (e.g. -fprofile-use=foo), > then it doesn't complain either. So how can I check whether it really ran > the FDO? Yep, maybe having an option that will cause failure would be a good idea. Anyway, you can use -fdump-ipa-profile and check *.065i.profile file where you should see something like: ... Read edge from 0 to 2, count:1 1 edge counts read ... Note that -fprofile-use=foo tells the compiler to search in *folder* foo for corresponding gcda files.
