Weird behaviour

foo.h

#include <climits>

const int toEnd = INT_MAX;

main.cc

#include <iostream>
#include <foo.h>
#include <climits>


int _end = toEnd;  // Adding const makes it behave nicely
int mx = INT_MAX;

int main() {
  std::cout << "INT_MAX " << mx << std::endl;
  std::cout << "_end    " << _end << std::endl;
  std::cout << "toEnd   " << toEnd << std::endl;

/* Output (gcc 4.6.3, x86_64)
  INT_MAX 2147483647
  _end    0           // !!
  toEnd   2147483647
*/

}