https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86450
--- Comment #23 from Jonathan Wakely <redi at gcc dot gnu.org> --- This should be fixed now, please confirm (I can't even get a build to complete with --enable-maintainer-mode, I continue to be amazed you rely on something so fragile). --enable-maintainer-mode no longer implies -Werror for libstdc++. To get -Werror you need to use --enable-werror (as one would expect). The -Wabi warnings are fixed by using -Wabi=2 to warn about ABI changes since -fabi-version=2 (and not by removing the option entirely).
