https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106437
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> --- With the exception of '_exit', exit family of functions (exit, _Exit, quick_exit) are also marked leaf despite exit and quick_exit invoking atexit/on_exit/at_quick_exit handlers. Only _Exit is specified not to invoke handlers. All four can resume a vfork.
