https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99898
--- Comment #10 from Jan Hubicka <hubicka at ucw dot cz> --- > Many of the *.opt changes are target specific, so you'd need to test it also > across all targets, and furthermore it depends on what exactly is being > saved/restored, many options might be at the same spot. > So perhaps we want to compute some hash of the options stuff (e.g. compute it > by the awk scripts that emit options*.[ch]) and use that to determine LTO > compatibility in addition to the version? That would work. One does not really do that in lto header, simply stream the hash before streaming out the optimization_node decl. Bit sad would be that w/o version info you have no indication if you mixed new compiler with old objects or vice versa, but that is minor anoyance I guess. It would be good that compiler would just sorryclaiming that it can not read object files created by different version.. I believe we already safe a diff from default values rather than streaming out all values. An option would be tom strea the option names rather than indexes so adding/removing completely unrelated option does not disturb the file format. Honza > > -- > You are receiving this mail because: > You are on the CC list for the bug.