https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63579
--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> --- The following was adopted for C++20 http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0840r2.html ABI description (not merged yet) https://github.com/itanium-cxx-abi/cxx-abi/pull/50
