maybe_kill_then_create_inferior (char *exec, char *args, char **env)
maybe_kill_then_create_inferior (char *exec, char *args, char **env, int from_tty)
maybe_kill_then_create_inferior (char *exec, char *args, char **env){  kill_or_be_killed (0);  target_create_inferior (exec, args, env);}