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document how to use system llvm

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Aleksey Kladov 2019-08-13 18:20:22 +03:00 committed by Who? Me?!
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@ -469,6 +469,18 @@ You can also use `--keep-stage 1` when running tests. Something like this:
- Initial test run: `./x.py test -i --stage 1 src/test/ui` - Initial test run: `./x.py test -i --stage 1 src/test/ui`
- Subsequent test run: `./x.py test -i --stage 1 src/test/ui --keep-stage 1` - Subsequent test run: `./x.py test -i --stage 1 src/test/ui --keep-stage 1`
### Building with system LLVM
By default, LLVM is built from source, and that can take significant amount of time.
An alternative is to use LLVM already installed on your computer.
This is specified in the `target` section of `config.toml`:
```toml
[target.x86_64-unknown-linux-gnu]
llvm-config = "/path/to/llvm/llvm-7.0.1/bin/llvm-config"
```
### Other `x.py` commands ### Other `x.py` commands
Here are a few other useful `x.py` commands. We'll cover some of them in detail Here are a few other useful `x.py` commands. We'll cover some of them in detail