[Bug libstdc++/123908] [16 regression] Undefined reference to std::__get_once_call()

[manisandro at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123908

--- Comment #6 from Sandro Mani <manisandro at gmail dot com> ---
They are missing:

$ nm --defined-only /usr/x86_64-w64-mingw32/sys-root/mingw/lib/libstdc++.dll.a
| grep -F __get_once_call
$ objdump -p /usr/x86_64-w64-mingw32/sys-root/mingw/bin/libstdc++-6.dll | grep
-F __get_once_call