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add note about rebuilding llvm

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Mark Mansi 2019-06-15 16:08:35 -05:00 committed by Who? Me?!
parent f706365749
commit 6ad9c2f2d3
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src/how-to-build-and-run.md
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@ -42,7 +42,9 @@ debug = true
```
If you have already built `rustc`, then you may have to execute `rm -rf build` for subsequent
configuration changes to take effect.
configuration changes to take effect. Note that `./x.py clean` will not cause a
rebuild of LLVM, so if your configuration change affects LLVM, you will need to
manually `rm -rf build/` before rebuilding.
### What is `x.py`?