https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109405
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- It's possible to fix for the --enable-symvers=gnu-versioned-namespace build which does not promise a backwards compatible ABI. I didn't do that yet, I *think* it was because support for [[no_unique_address]] was still patchy in Clang and other non-GCC compilers. Maybe that's no longer an issue and it could be done now.