https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83562
--- Comment #6 from LIU Hao <lh_mouse at 126 dot com> --- The mingw-w64 bug which you've linked has been fixed for UCRT: https://github.com/mingw-w64/mingw-w64/blob/0d42217123d3aec0341b79f6d959c76e09648a1e/mingw-w64-crt/crt/tls_atexit.c#L119
