[llvm-dev] How to configure cmake to not rebuild .inc (tablegen) files?

[Jie Zhou via llvm-dev]

Dear all,

I’m developing Clang&LLVM on MacOS Catalina 10.15.
Now every time I "make clang", the building systems rebuilds
all the .inc files generated by cmake, which essentially
rebuilds all the tablegen files in llvm, although I did not
change any of the tablegen files. The building is unnecessary
and slow, especially when it builds the X86GenSubtargetInfo.inc.
Is there a way to prevent cmake generating Makefiles that
rebuilds all the tablegen files?

Here is my command line to run cmake for generating Makefiles:

cmake -G “Unix Makefiles” -DLLVM_TARGETS_TO_BUILD=“X86" -DCMAKE_BUILD_TYPE=Debug $(LLVM_SRC)

The cmake version is 3.13.4. And I did not experience the same behavior on a Linux.

Thanks,
- Jie
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