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

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cor3ntin wrote:

My understanding is that enable_if is sfinae friendly, I posted a link showing that somewhere in the PR. 
But I can't think of a solution that would work for gcc?

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