[Bug libstdc++/71049] [6/7 Regression] libstdc++ fails to build --with-default-libstdcxx-abi=gcc4-compatible --disable-libstdcxx-dual-abi

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71049

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This should be dealt with at the same time as PR 65762