[Bug libstdc++/65343] unexpected exception thrown during destruction of static object in debug mode

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65343

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
We should do something similar in src/c++11/mutex.cc

  mutex&
  __get_once_mutex()
  {
    static mutex once_mutex;
    return once_mutex;
  }