[Bug libstdc++/69266] bootstrap failure undefined reference to `std::basic_ios<char, std::char_traits<char> >::

[tprince at computer dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69266

--- Comment #2 from tprince at computer dot org ---
It is possible to bootstrap by configure --disable-libstdcxx.  Then it is
possible to configure and build (but not make check?) in libstdc++-v3. I'm not
sure of the consequences of this.