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Include information about setup defaults in how-to-build guide #1694

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Jun 21, 2023
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Include information about setup defaults in how-to-build guide #1694

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7 changes: 5 additions & 2 deletions src/building/how-to-build-and-run.md
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Expand Up @@ -67,8 +67,11 @@ You can install it with `cargo install --path src/tools/x`.

## Create a `config.toml`

To start, run `./x.py setup`. This will do some initialization and create a
`config.toml` for you with reasonable defaults.
To start, run `./x.py setup` and select the `compiler` defaults. This will do some initialization
and create a `config.toml` for you with reasonable defaults. If you use a different default (which
you'll likely want to do if you want to contribute to an area of rust other than the compiler, such
as rustdoc), make sure to read information about that default (located in `src/bootstrap/defaults`)
as the build process may be different for other defaults.

Alternatively, you can write `config.toml` by hand. See `config.example.toml` for all the available
settings and explanations of them. See `src/bootstrap/defaults` for common settings to change.
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