a.c

void
sfunc(int room)
{
	if (room)
		go();
}

void
func(int argc)
{
	struct {
		int argc;
	} *obj = go();

	setjmp(123);

	obj->argc = argc;
	if (obj->argc)
		sfunc(argc);
	else {
		if (argc > 0)
			argc = 1;
		sfunc(obj);
	}
	if (obj->argc > 0)
		abc();
}