[libcxx-commits] [libcxx] [libc++][CMake] Adds option to disable clang-tidy. (PR #95654)

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EricWF wrote:

On second thought, This setups allows for clang-tidy tests to be silently turned off if the auto-configuration fails, right?
I don't like when tests can turn themselves off silently and automagically, and I really like the clang-tidy tests.

If this is the case, should this option have three values? `ON`, `FORCE_ON`, and `OFF`? Where the default is `ON` ,  and is set to `FORCE_ON` in the CI?  

https://github.com/llvm/llvm-project/pull/95654