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Consider a setup without a system-wide installation of lit. Instead you pass the path to lit like this: ``` cmake ... -DLLVM_EXTERNAL_LIT=<PATH_TO_LIT_BINARY> ... ``` Then you will run into this error: ``` ninja: error: unknown target 'check-lld' ``` I have a buildbot builder that fails with this message. Here's the passage that triggers this error: https://github.com/llvm/llvm-zorg/blob/d3bfd5ccbceb542098c350e4d071ceceac6854cb/zorg/buildbot/builders/annotated/standalone-build.sh#L194-L239 By using `LLVM_EXTERNAL_LIT` instead of `LLVM_LIT` we fix this problem. See [here](https://llvm.org/docs/GettingStarted.html#stand-alone-builds) for a description: > Both the LLVM_ROOT and LLVM_EXTERNAL_LIT options are required to do stand-alone builds for all sub-projects. Additional required options for each sub-project can be found in the table below. Differential Revision: https://reviews.llvm.org/D154599
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