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Merge pull request #2482 from jieyouxu/download-rustc

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Add temporary broken `./x test library/std` advisory
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Jakub Beránek 2025-06-29 08:10:52 +02:00 • committed by GitHub
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src/doc/rustc-dev-guide/src/building/how-to-build-and-run.md
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@ -2,6 +2,24 @@
<!-- toc -->
<div class="warning">
For `profile = "library"` users, or users who use `download-rustc = true | "if-unchanged"`, please be advised that
the `./x test library/std` flow where `download-rustc` is active (i.e. no compiler changes) is currently broken.
This is tracked in <https://github.com/rust-lang/rust/issues/142505>. Only the `./x test` flow is affected in this
case, `./x {check,build} library/std` should still work.
In the short-term, you may need to disable `download-rustc` for `./x test library/std`. This can be done either by:
1. `./x test library/std --set rust.download-rustc=false`
2. Or set `rust.download-rustc=false` in `bootstrap.toml`.
Unfortunately that will require building the stage 1 compiler. The bootstrap team is working on this, but
implementing a maintainable fix is taking some time.
</div>
The compiler is built using a tool called `x.py`. You will need to
have Python installed to run it.