https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113074
--- Comment #10 from Peter Kasting <pkasting at google dot com> --- (In reply to Jonathan Wakely from comment #9) > (In reply to Andrew Pinski from comment #5) > > Created attachment 56905 [details] > > testcase which shows libc++ and libstdc++ difference > > > > with libstdc++, both GCC and clang reject this. > > with libc++, clang accepts this (I only tested clang because it was the > > easiest to test there). > > AFAICT only libc++ from llvm trunk accepts this, even 17.0.1 gives an error > outside the immediate context, like libstdc++ does. Yes, but that was because libc++ did not implement LWG3545 until LLVM 18. When Jose reported this issue in Chromium I pushed back on fixing on our side because I thought libstdc++ had the same issue. But this is a distinct issue; std::to_address<> is not required to be SFINAE-compatible even if std::pointer_traits<> now is.
