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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]

• Vendoring is no longer done automatically when building from git sources. To use vendoring, run cargo vendor manually, or use the pre-vendored rustc-src tarball.
• llvm-libunwind now accepts in-tree (formerly true), system or no (formerly false) #77703
• The options infodir, localstatedir, and gpg-password-file are no longer allowed in config.toml. Previously, they were ignored without warning. Note that infodir and localstatedir are still accepted by ./configure, with a warning. #82451
• Change the names for dist commands to match the component they generate. #90684
• The build.fast-submodules option has been removed. Fast submodule checkouts are enabled unconditionally. Automatic submodule handling can still be disabled with build.submodules = false.
• Several unsupported ./configure options have been removed: optimize, parallel-compiler. These can still be enabled with --set, although it isn’t recommended.
• remote-test-server’s verbose argument has been removed in favor of the --verbose flag
• remote-test-server’s remote argument has been removed in favor of the --bind flag. Use --bind 0.0.0.0:12345 to replicate the behavior of the remote argument.
• x.py fmt now formats only files modified between the merge-base of HEAD and the last commit in the master branch of the rust-lang repository and the current working directory. To restore old behaviour, use x.py fmt .. The check mode is not affected by this change. #105702
• The llvm.version-check config option has been removed. Older versions were never supported. If you still need to support older versions (e.g. you are applying custom patches), patch check_llvm_version in bootstrap to change the minimum version. #108619
• The rust.ignore-git option has been renamed to rust.omit-git-hash. #110059
• --exclude no longer accepts a Kind as part of a Step; instead it uses the top-level Kind of the subcommand. If this matches how you were already using –exclude (e.g. x test --exclude test::std), simply remove the kind: --exclude std. If you were using a kind that did not match the top-level subcommand, please open an issue explaining why you wanted this feature.

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
• Add options for enabling overflow checks, one for std (overflow-checks-std) and one for everything else (overflow-checks). Both default to false.
• Add llvm option enable-warnings to have control on llvm compilation warnings. Default to false.
• Add rpath option in target section to support set rpath option for each target independently. #111242

[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].
  • #76439
  • #76667
  • #76708
• 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.
• File locking is now used to avoid collisions between multiple running instances of x.py (e.g. when using rust-analyzer and x.py at the same time). Note that Solaris and possibly other non Unix and non Windows systems don’t support it #108607. This might possibly lead to build data corruption.

[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