On Tue, Dec 27, 2022 at 9:38 PM Alexander Zaitsev <zamazan...@tut.by> wrote: > > Hello. > > We are using GCC for our C++ projects. Our projects are huge, commit > rate is quite huge, so our CI workers are always busy (so as any other > CI workers, honestly). Since we want to increase build speed, one of the > option is to optimize the compiler itself. Sounds like a good case for PGO. > > Clang has the infrastructure for building the Clang itself with PGO: > https://llvm.org/docs/HowToBuildWithPGO.html . I have tried to find > something like that for GCC but with no success. > > My proposal is: > > * add support for building PGO-optimized GCC into the GCC build > infrastructure > * add documentation to the GCC site, how to build GCC with PGO > optimizations
It is already there, see the last section of https://gcc.gnu.org/install/build.html (Building with profile feedback). It has been included in GCC and documented since June 2003. https://gcc.gnu.org/r0-50361-g8f231b5d874dcb . > * (if GCC community provides prebuilt gcc binaries) use PGO for the > prebuilt binaries. E.g. Clang and rustc already uses this approach. GCC community does not provide prebuilt gcc binaries for a few different reasons. But distros do provide more recent prebuilt binaries, you could ask them to build using PGO (some do already I think). Thanks, Andrew Pinski > > Any feedback is appreciated. > > Thanks in advance! > > -- > Best regards, > Alexander Zaitsev
