[PATCH] D137724: [CMake] Warn when the version is older than 3.20.0.

[Fangrui Song via Phabricator via cfe-commits]

MaskRay accepted this revision as: MaskRay.
MaskRay added a comment.

I think `if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)` checks for standalone builds is not necessary. The check in `llvm/CMakeLists.txt` suffices.
It's unlikely the users will use different cmake versions to configure llvm and a subproject like clang.


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  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D137724/new/

https://reviews.llvm.org/D137724