[PATCH] D49672: [CMake] Honor LLVM_EXTERNAL_<proj>_SOURCE_DIR

[Shoaib Meenai via Phabricator via llvm-commits]

smeenai added a comment.

This is pretty confusing, but there's both `LLVM_ENABLE_PROJECTS`, which assumes the side-by-side layout, and `LLVM_EXTERNAL_PROJECTS`, which assumes the corresponding `SOURCE_DIR` variables will be set. It sounds like `LLVM_EXTERNAL_PROJECTS` is what you want for your use case.


Repository:
  rL LLVM

https://reviews.llvm.org/D49672