[Bug libstdc++/97949] Recursive calls of std::call_once together with cout leads to deadlock under mingw64

[fiesh at zefix dot tv via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97949

--- Comment #8 from fiesh at zefix dot tv ---
Created attachment 61892
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61892&action=edit
unreduced test case