https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96203
--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> --- (In reply to H.J. Lu from comment #12) > Please this patch. /* Merge and update the -fcf-protection option. */ but here you take the setting from the last file rather than merging it, I'd have expected a |= operation and also handling of CF_FULL for the string update.