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Clarify cargo fallback behavior for rustup link #1273

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Merged
merged 2 commits into from
Jun 6, 2022
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Clarify cargo fallback behavior for rustup link #1273

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6d47c22
Clarify cargo fallback behavior for rustup link
couchand Dec 8, 2021
f7b068f
Add link to rustup docs on custom toolchains
couchand Jun 6, 2022
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6 changes: 6 additions & 0 deletions src/building/how-to-build-and-run.md
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Expand Up @@ -217,6 +217,12 @@ The rustup toolchain points to the specified toolchain compiled in your `build`
so the rustup toolchain will be updated whenever `x.py build` or `x.py test` are run for
that toolchain/stage.

**Note:** the toolchain we've built does not include `cargo`. In this case, `rustup` will
fall back to using `cargo` from the installed `nightly`, `beta`, or `stable` toolchain
(in that order). If you need to use unstable `cargo` flags, be sure to run
`rustup install nightly` if you haven't already. See the
[rustup documentation on custom toolchains](https://rust-lang.github.io/rustup/concepts/toolchains.html#custom-toolchains).

## Other `x.py` commands

Here are a few other useful `x.py` commands. We'll cover some of them in detail
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