185de5f41a
Allow building rustdoc without first building rustc (MVP) ## Motivation The compile times for rustc are extremely long and a major issue for recruiting new contributors to rustdoc. People interested in joining often give up after running into issues with submodules or python versions. stage1 rustdoc fundamentally doesn't care about bootstrapping or stages, it just needs `rustc_private` available. ## Summary of Changes - Add an opt-in `[rust] download_rustc` option - Determine the version of the compiler to download using `log --author=bors` - Do no work for any component other than `Rustdoc` for any stage. Instead, copy the CI artifacts from the downloaded sysroot stage0/ to stage0-sysroot/ or stage1/ in `Sysroot`. This is done with an `ENABLE_DOWNLOAD_STAGE1` constant which is off by default. - Don't download different versions of rustfmt or cargo - those should still use the beta version (rustfmt especially). The vast majority of work is done in bootstrap.py, which downloads the artifacts and extracts them to stage0/ in place of the beta compiler. Rustbuild just takes care of copying the artifacts to stage1 if necessary. ## Future work - I turned off verification for the commit tarballs because the .sha256 URLs gave a 404. This seems not ideal, it would be nice to start signing them. - This will break if you rebase an old enough branch (I think commits are kept at most 160 days?). This doesn't need to be supported, but it would be nice to give a reasonable error. https://github.com/rust-lang/rust/pull/79540#issuecomment-751481291 - Right now, every time you rebase, stage0 tools (bootstrap, tidy, ...) will have to be recompiled. Additionally running `x.py setup tools` will compile rustbuild twice. Instead, this should download a separate beta compiler for stage0 and only use CI artifacts for stage1 onward. https://github.com/rust-lang/rust/pull/79540#issuecomment-757047321 - Add `x.py setup tools` to enable this conveniently (it doesn't make sense to use this for compiler developers). |
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|---|---|---|
| .. | ||
| bootstrap | ||
| build_helper | ||
| ci | ||
| doc | ||
| etc | ||
| librustdoc | ||
| llvm-project@70d09f218d | ||
| rustdoc-json-types | ||
| test | ||
| tools | ||
| README.md | ||
| stage0.txt | ||
| version | ||
README.md
This directory contains the source code of the rust project, including:
- The test suite
- The bootstrapping build system
- Various submodules for tools, like rustdoc, rls, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.