https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49171
--- Comment #23 from Jonathan Wakely <redi at gcc dot gnu.org> --- What you want (and what everybody I've seen asking for similar things) is to give a compile-time constant value to a pointer. All that's needed for that is an extension to provide a compile-time constant value to a pointer, not to allow arbitrary reinterpret_casts in constexpr. A more limited extension that solves the problem is a lot more reasonable.
