[Bug libstdc++/90361] [9/10 Regression] Undefined symbols in libstdc++ when building with --with-default-libstdcxx-abi=gcc4-compatible

[ostash at ostash dot kiev.ua]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90361

--- Comment #3 from Viktor Ostashevskyi <ostash at ostash dot kiev.ua> ---
(In reply to Jonathan Wakely from comment #2)
> I haven't checked a build with that option for ages, so I can easily believe
> I've broken it. I'll take a look tomorrow.

It worked well in GCC 8.2.0 at least.