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

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https://github.com/cor3ntin commented:

Thanks a lot for working on this.
I like this approach a lot! 

Honestly I don't understand the "literal" requirement knowing it's unimplementable without compiler magic (at least not in a way that  gives a good user experience).
And I don't like that this wording introduces UB into something that ought to be compile-time checked. Maybe this is LWG issue material. WDYT?

I would rather go with your solution than a magic attribute if we can avoid. (the magic attribute would only have an extremely narrow use case)

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