https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84995
--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> --- (In reply to Jan Hubicka from comment #16) > > Plugin interface should be good enough to allow LTO optimizing one > binary with multiple compilers (multiple versions of GCC or GCC+LLVM > combination) where obviously no cross-module optimization between > compilers will happen but still each compiler will get acurate > resolution data that will let it to optimize well within the portion of > binary it understands. > > We are missing way to specify multiple plugins to linker and some other > supporting bits I believe. Yes, the main issue is how we find lto-wrapper (COLLECT_GCC* environment) and that lto-wrapper does _not_ work across GCC versions. I guess lto-plugin would ideally partition the set of files according to the LTO byte-code version and we'd have a way to lookup gcc and lto-wrapper by LTO byte-code version. > Honza
