rust/src/bootstrap/flags.rs, branch 1.52.1

avoid full-slicing slices

2021-02-15T23:31:11+00:00

If we already have a slice, there is no need to get another full-range slice from that, just use the original. clippy::redundant_slicing

Support non-stage0 check

2021-01-16T15:07:09+00:00

Utilize PGO for rustc linux dist builds

2020-12-22T17:23:37+00:00

This implements support for applying PGO to the rustc compilation step (not standard library or any tooling, including rustdoc). Expanding PGO to more tools is not terribly difficult but will involve more work and greater CI time commitment. For the same reason of avoiding greater time commitment, this currently avoids implementing for platforms outside of x86_64-unknown-linux-gnu, though in practice it should be quite simple to extend over time to more platforms. The initial implementation is intentionally minimal here to avoid too much work investment before we start seeing wins for a subset of Rust users. The choice of workloads to profile here is somewhat arbitrary, but the general rationale was to aim for a small set that largely avoided time regressions on perf.rust-lang.org's full suite of crates. The set chosen is libcore, cargo (and its dependencies), and a few ad-hoc stress tests from perf.rlo. The stress tests are arguably the most controversial, but they benefit those cases (avoiding regressions) and do not really remove wins from other benchmarks. The primary next step after this PR lands is to implement support for PGO in LLVM. It is unclear whether we can afford a full LLVM rebuild in CI, though, so the approach taken there may need to be more staggered. rustc-only PGO seems well affordable on linux at least, giving us up to 20% wall time wins on some crates for 15 minutes of extra CI time (1 hour up from 45 minutes). The PGO data is uploaded to allow others to reuse it if attempting to reproduce the CI build or potentially, in the future, on other platforms where an off-by-one strategy is used for dist builds at minimal performance cost.

Add `--color` support to bootstrap

2020-11-12T21:31:21+00:00

This allows using bootstrap with https://github.com/Canop/bacon.

Add --fix support to `x.py clippy`

2020-10-26T22:58:52+00:00

x.py test --test-args flag description enhancement

2020-10-23T19:06:37+00:00

x.py: setup: Provide a description of what it does

2020-10-14T10:40:53+00:00

Co-authored-by: Joshua Nelson

x.py: setup: Refactor to centralise list of profiles

2020-10-14T10:40:53+00:00

Put all()'s otuput in the order we want to print things in, and add a comment about why they are in this order. Provide purpose() and all_for_help(). Use these things everywhere. Move all the abbrev character ("a", "b", etc.) processing into interactive_path. No functional change. Signed-off-by: Ian Jackson

bootstrap: add --include-default-paths to ./x.py

2020-10-12T17:53:25+00:00

Rollup merge of #77624 - akoptelov:c-all-targets-fix, r=jyn514

2020-10-06T22:16:16+00:00

Add c as a shorthand check alternative for new options #77603 There is a missing "c" that is a shorthand for "check" in newly added match arm for handling check-specific options.