[libcxx-commits] [libcxx] [libc++] Avoid -Wzero-as-null-pointer-constant in operator<=> (PR #79465)

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https://github.com/cor3ntin approved this pull request.

@ldionne I think we should go with that, see how it goes.
Ideally, GCC would implement `enable_if` https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79459 . 

If they won't and GCC compatibility is important, the only other option I see is a magic attribute on the type of the parameter that clang... but that also requires vendor coordination

https://github.com/llvm/llvm-project/pull/79465