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Certain versions of CMake specify /W3 as part of CMAKE_CXX_FLAGS by default, before you do anything. Appending /W4 to the end of this and using the Ninja generator results in cl : Command line warning D9025 : overriding '/W3' with '/W4'. It is not possible to suppress this since it is a command line warning and not a compiler warning, so we must fix the command line to contain only one value for /Wn. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234907 91177308-0d34-0410-b5e6-96231b3b80d8
See docs/CMake.html for instructions on how to build LLVM with CMake.