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Specify dependency on rust-src component in rust-toolchain

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Philipp Oppermann
2021-02-07 19:07:41 +01:00
parent 943f950c54
commit f9f9b969bb
1 changed files with 13 additions and 1 deletions
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14
blog/content/edition-3/posts/01-minimal-kernel/index.md
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@@ -637,7 +637,19 @@ unable to build with the standard library, try:
It still fails. The problem is that cargo needs a copy of the Rust source code in order to recompile the `core` crate. The error message helpfully suggest to provide such a copy by installing the `rust-src` component.
After running the suggested `rustup component add rust-src` command, the build should now finally succeed:
Instead of running the suggested `rustup component add rust-src` command, we an also record the dependency on the `rust-src` component in our `rust-toolchain` file:
```toml
# in rust-toolchain
[toolchain]
channel = "nightly"
components = ["rust-src"]
```
This way, `rustup` will automatically download the required components so that no manual steps are necessary.
After installing the `rust-src` component (either manually or automatically), the build should finally succeeds:
```
> cargo build --target x86_64-blog_os.json -Z build-std=core