https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100903
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to M Welinder from comment #2) > I think the current magic-pointer code could be improved with something like > > template<class T,std::enable_if_t<std::is_same_v<T,std::nullptr_t>>> > bool operator< (..., T) = delete; Or another constructor for the __cmp_cat::__unspec type. I did try that at one point. The current code was the least bad solution of several that I tried. I didn't notice the -Wzero-as-null-pointer-constant warning because it's not enabled by default (because it's about coding style, not correctness).
