[libcxx-commits] [libcxx] [libc++] Adds a new feature-test macro generator class. (PR #90889)

[Mark de Wever via libcxx-commits]

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mordante wrote:

We don't have a precedence for a good location under test. Let's discuss the location next time after which I'm happy to make the change and update all tests to use the new location.

https://github.com/llvm/llvm-project/pull/90889