On Fri, 2020-06-05 at 19:23 +0200, Florian Weimer wrote: > * Jeff Law: > > > I'm not suggesting switching the default. I'm suggesting the compiler > > choice be made by the upstream projects. Some prefer LLVM, others > > prefer GCC. Fedora should get out of the way and use the same tools > > that the upstream projects are using. > > Do we know how many upstream projects actually recommend building with a > recent Clang upstream release? Chromium explicitly does not: Not really. I'm not in a great position to know the set of upstream projects that recommend Clang/LLVM. > > > Chromium ships a prebuilt clang binary. It's just upstream clang built > > at a known-good revision that we bump every two weeks or so. > > > > This is the only supported compiler for building Chromium. > > <https://chromium.googlesource.com/chromium/src/+/master/docs/clang.md> Yea, Tom mentioned this tidbit to me privately. > > Currently, it's this build: > > $ ./src/third_party/llvm-build/Release+Asserts/bin/clang++ --version > clang version 11.0.0 (https://github.com/llvm/llvm-project/ > a6ae333a0c23fc9b0783ca45e2676abac00c6723) > Target: x86_64-unknown-linux-gnu > Thread model: posix > InstalledDir: /home/test/chromium/./src/third_party/llvm- > build/Release+Asserts/bin > > So something pulled recently from the development branch, not a release > branch. > > In my experience, this is pretty typical: Upstreams leaning towards > Clang expect that you use their prebuilt compiler, not a system > compiler. I suspect you're right. > > Using Clang downstream may make things simpler for packagers, but a > system-supplied Clang compiler is rarely a preferred upstream choice > (not even on Macos, where there is no real choice anymore). I'm not sure making this distinction is that useful. If upstream prefers an pre- built clang, then ISTM we'd either be using that pre-built clang or our system clang. Forcing a packager to use GCC seems wrong in this case. > > On the other hand, there is demand from users (not just packagers) for > the LLVM-based toolchain, and increased use by Fedora packagers will > help us to improve the quality of Fedora's version of it. Fortunately, > for this effect, it does not matter *why* Fedora packagers choose Clang. Right. jeff > _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
