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Clarified issues when building miri with a custom rustc #2112

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May 10, 2022
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Clarified issues when building miri with a custom rustc #2112

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Clarified issues when building miri with a custom rustc
y86-dev May 10, 2022
4632b2c
tweak wording
RalfJung May 10, 2022
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8 changes: 8 additions & 0 deletions CONTRIBUTING.md
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Expand Up @@ -206,6 +206,14 @@ rustup toolchain link stage2 build/x86_64-unknown-linux-gnu/stage2
rustup override set stage2
```

Important: You need to delete the Miri cache when you change the stdlib; otherwise the
old, chached version will be used. On Linux, the cache is located at `~/.cache/miri`; the exact
location is printed after the library build: "A libstd for Miri is now available in ...".

Note: `./x.py --stage 2 compiler/rustc` currently errors with `thread 'main'
panicked at 'fs::read(stamp) failed with No such file or directory (os error 2)`,
you can simply ignore that error; Miri will build anyway.

For more information about building and configuring a local compiler,
see <https://rustc-dev-guide.rust-lang.org/building/how-to-build-and-run.html>.

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