static void _register_callback(void (*cb)(void *arg), void *arg)
{
+ (void)cb;
+ (void)arg;
}
#define register_callback(cb, arg) \
static void my_callback(char *p)
{
+ (void)p;
}
-int main(int argc, char *argv[])
+int main(void)
{
char str[] = "hello world";
#ifdef FAIL