[libcxx-commits] [libcxx] Simplify the __assertion_handler build logic. Be friendly to IDEs. (PR #93333)

[Christopher Di Bella via libcxx-commits]

cjdb wrote:

Would it be possible to add a CMake option to inform the build system that libc++ is being worked on (e.g. `-DLIBCXX_ENABLE_DEVELOPER_MODE=Yes`), that autogenerates the `__assertion_handler` header for in-tree use?

IIUC, this would solve @EricWF's problem without affecting the concerns raised by @ldionne and @var-const.

https://github.com/llvm/llvm-project/pull/93333