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Add a paragraph on installing ninja-build in order to build LLVM #1209

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Add a paragraph on installing ninja-build in order to build LLVM #1209

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4 changes: 4 additions & 0 deletions src/building/how-to-build-and-run.md
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Expand Up @@ -52,6 +52,10 @@ If you have already built `rustc` and you change settings related to LLVM, then
execute `rm -rf build` for subsequent configuration changes to take effect. Note that `./x.py
clean` will not cause a rebuild of LLVM.

If you are building LLVM (i.e. you didn't add `download-ci-llvm = true`
to the `[llvm]` section of `config.toml`), you'll want to
[install the `ninja-build` tool](https://github.com/ninja-build/ninja/wiki/Pre-built-Ninja-packages).

## What is `x.py`?

`x.py` is the script used to orchestrate the tooling in the `rustc` repository.
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