On Mon, Jul 22, 2019 at 1:15 PM Florian Weimer <fwei...@redhat.com> wrote: > > * Richard Biener: > > > On Fri, Jul 19, 2019 at 10:30 AM Florian Weimer <fwei...@redhat.com> wrote: > >> > >> * Romain Geissler: > >> > >> > That may fly in the open source world, however I expect some vendors > >> > shipping proprietary code might be fine with assembly/LTO > >> > representation of their product, but not source. > >> > >> They can't ship LTO today anyway due to the format incompatibility, so > >> that's not really an argument against source-based LTO. > > > > Source-based LTO doesn't really work unless you can re-synthesize > > source from the IL. At least I don't see how you can do whole-program > > analysis on source and then cut it into appropriate pieces, duplicating > > some things and some not to make up for the parallel final compile step. > > Oh, I meant using source code only as a portable serialization of the > program, instead of serializing unstable, compiler-specific IR. If the > whole program does not fit into memory, the compiler will still have to > maintain on-disk data structures, but at least there wouldn't a > compatibility aspect to those anymore.
OK, but then we'd need to re-do the compile and IPA analysis stage at each link with the appropriate frontend. But sure, that would be possible. Richard. > Thanks, > Florian
