Bug 169187

When compiling programs on an amd64 machine with the -m32 compiler flag, uint64_t variables are incorrectly sized, resulting in sizeof(uint64_t) == 4.  Presumably this affects int64_t as well, and any types that are typedef'ed to one of these.

Fix: 

The file <machine/_types.h> defines __uint64_t as unsigned long on amd64 platforms.  When compiling with -m32, however, the compiler makes unsigned long a 32-bit integer, which seems to be the root of the problem.

A simple fix is to detect when sizeof(unsigned long) == 4, and define __uint64_t as unsigned long long instead.
How-To-Repeat: Compile the following program:

#include <stdio.h>
#include <stdlib.h>

int main() { printf("%d\n", sizeof(uint64_t)); return 0; }

with the following command:

gcc -m32 -o test test.c

The output will be "4" as opposed to "8" like it should be.