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Zachary Turner 8e996791d5 [msvc] Strip /W[0-4] before appending /W4
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.

llvm-svn: 234907
2015-04-14 16:57:54 +00:00
..

See docs/CMake.html for instructions on how to build LLVM with CMake.