[PATCH] D145619: extend llvm variables for build flexibility

[Shoaib Meenai via Phabricator via llvm-commits]

smeenai added a comment.

One other alternative for Rust to consider would be to support building as part of an LLVM build using `LLVM_EXTERNAL_PROJECTS` and `LLVM_EXTERNAL_<PROJECT>_SOURCE_DIR`, so that Rust becomes part of the LLVM build graph and can easily access its targets. See https://github.com/apple/swift/blob/c95e11c011e5e6ee19f9c21332ff04df29dd49db/cmake/modules/SwiftSharedCMakeConfig.cmake#L269 for how Swift does it.


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https://reviews.llvm.org/D145619