https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99898
--- Comment #8 from Jan Hubicka <hubicka at ucw dot cz> --- > Any *.opt changes can break the streaming of optimization or target option > nodes. > And from experience with gcc plugins we have such changes ~ each month even on > release branches. It may make sense to add a simple test to our regular testers that either the new revision can consume old object files or the version was updated :) Honza