#include <stdio.h>
#include <limits.h>
#include <stdint.h>

int main (int argc, char** argv)
{
        printf ("%ld %ld\n", sizeof(long), sizeof(int));
        printf ("%ld %d\n", LONG_MAX, INT_MAX);
        printf ("%d\n", __WORDSIZE);
        return 1;
}

------------------

[wiking@sandbox ~]$ clang test.c -o test
[wiking@sandbox ~]$ ./test
8 4
9223372036854775807 2147483647
64