[cfe-dev] compile_commands.json for Windows/MSVC

[Richard]

Some of the clang based tools, such as clang-check, require a
compile_commands.json file which is generated by CMake.  I tried
running Windows CMake to generate this file, but it issued an error
message and didn't write the file.

So I hacked one together using a Visual Studio project build log.  It
gets me by, but lots of warnings are spewed about unrecognized command
line arguments.

Does anyone else have a better method for generating these?  Maybe I
just need the right CMake incantation.
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