Changelog

All notable changes to bootstrap will be documented in this file.

The format is based on Keep a Changelog.

[Changes since the last major version]

  • llvm-libunwind now accepts in-tree (formerly true), system or no (formerly false) #77703

Non-breaking changes

  • x.py check needs opt-in to check tests (--all-targets) #77473
  • The default bootstrap profiles are now located at bootstrap/defaults/config.$PROFILE.toml (previously they were located at bootstrap/defaults/config.toml.$PROFILE) #77558
  • If you have Rust already installed, x.py will now infer the host target from the default rust toolchain. #78513

[Version 2] - 2020-09-25

  • host now defaults to the value of build in all cases
    • Previously host defaulted to an empty list when target was overridden, and to build otherwise

Non-breaking changes

  • Add x.py setup #76631
  • Add a changelog for x.py #76626
  • Optionally, download LLVM from CI on Linux and NixOS. This can be enabled with download-ci-llvm = true under [llvm].
  • Distribute rustc sources as part of rustc-dev #76856
  • Make the default stage for x.py configurable #76625. This can be enabled with build-stage = N, doc-stage = N, etc.
  • Add a dedicated debug-logging option #76588. Previously, debug-logging could only be set with debug-assertions, slowing down the compiler more than necessary.
  • Add sample defaults for x.py #76628
  • Add --keep-stage-std, which behaves like keep-stage but allows the stage 0 compiler artifacts (i.e., stage1/bin/rustc) to be rebuilt if changed #77120.

[Version 1] - 2020-09-11

This is the first changelog entry, and it does not attempt to be an exhaustive list of features in x.py. Instead, this documents the changes to bootstrap in the past 2 months.

  • Improve defaults in x.py #73964 (see blog post for details)
  • Set ninja = true by default #74922
  • Avoid trying to inversely cross-compile for build triple from host triples #76415
  • Allow blessing expect-tests in tools #75975
  • x.py check checks tests/examples/benches #76258
  • Fix rust.use-lld when linker is not set #76326
  • Build tests with LLD if use-lld = true was passed #76378