[cfe-dev] How to generate compile_commands.json for clang?

[Guangqing Chen via cfe-dev]

Hi,
I'm new to clang.
I follow the [get_started](https://clang.llvm.org/get_started.html) to
build clang (on linux).
However, if I add `-DCMAKE_EXPORT_COMPILER_COMMANDS` to the cmake command,
the resulted compile_commands.json only contains llvm related cpp.
What should I do to get that of clang?
Thanks for any help!
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