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Hello, I work on CMake upstream. I'd like to find out in what ways CMake upstream does not fit the needs of llvm/clang, and then fill those gaps. The recent update of the minimum version to CMake 2.8.8 is a good start. Before being able to assess what is missing, it should be ensured that the current codebase is as modern as the minimum version allows, and it needs to be cleaned up. 1)