https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115211
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- (In reply to Richard Biener from comment #3) [..] > Ah! Use -Q --help=optimizers (how intuititve...) Or when invoking cc1 omit -quiet. remember to put --help=optimziers after optimization options.