We've also been running Windows code coverage builds with clang on CI for a while (since December), with almost all tests.
- Marco. On Friday, May 11, 2018 at 2:35:57 AM UTC+2, Anthony Jones wrote: > You may already know that the Low-Level Tools team support important tools > and code infrastructure. Lately we’ve also been improving our rustc/clang > (LLVM) story and I’d like bring everyone up to date. > > There are a lot of important and interesting things going on: > > * Michael Woerister and Nathan Froyd recently (mid-March) enabled Rust > incremental compilation for Firefox developers > * Michael is experimenting with cross language inlining[1] (rustc/clang) > using LTO > * Preliminary results show compiling LLVM with clang and using LTO on > rustc improves stylo compilation time by around 15% [on-my-machine > measurements] > * LTO requires more work to support Firefox > * Nick Nethercote has started speeding up rustc[2] and has already had a > number of wins > * David Major has got Windows clang builds working with green tests > * LTO is still buggy (but works well enough to run benchmarks) and > PGO won’t run on Windows > * Win32 - clang with LTO w/o PGO is marginally faster than MSVC with > LTO/PGO > * Win64 - clang with LTO w/o PGO is ~5-10% slower than MSVC with > LTO/PGO > * Windows users can build locally with clang[3] > * Mike Hommey is tracking improvements and regressions in the Rust > compiler (performance regression[4], crash reporting[5] and more crash > reporting[6]) > * Tom Tromey is continuing to work on first class Rust support in GDB and > LLDB > > Note: this a summary of things rustc/clang stuff that is happening only. > > Ultimately, I’d like to see us standardise on clang on all platforms because > it makes Rust/C++ integration better as well as making things simpler for > developers and build system maintainers. We’ll get more done if we make our > own lives simpler. > > I have some specific requests for you: > > Let me know if you have specific Firefox related cases where Rust is > slowing you down (thanks Jeff [7]) > Cross language inlining is coming - avoid duplication between Rust and > C++ in the name of performance > Do developer builds with clang > > Anthony > > [1] https://github.com/rust-lang/rust/issues/49879 > [2] > https://blog.mozilla.org/nnethercote/2018/04/30/how-to-speed-up-the-rust-compiler-in-2018/ > [3] > https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Building_Firefox_on_Windows_with_clang-cl > [4] https://github.com/rust-lang/rust/issues/49873 > [5] https://bugzilla.mozilla.org/show_bug.cgi?id=1456150 > [6] https://bugzilla.mozilla.org/show_bug.cgi?id=1448868 > [7] https://github.com/rust-lang/rust/issues/50584 _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
