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

[Mehdi AMINI via llvm-dev]

On Sun, Oct 20, 2019 at 4:21 PM Jie Zhou via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> 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,
>

Are you saying that if you re-run `make clang` immediately after the first
invocation complete you see these files rebuilt? You're not changing
anything in the repo or running `git pull` (or equivalent)? This would
really not be expected.

-- 
Mehdi




> 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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