When trying a loop collapse with gcc 4.8.1 I get warnings about unitialized internal variables.

Reduced test case:

#include <cstdlib>
#include <vector>
#include <cstdio>

int main(void) {
  size_t N=10;

#ifdef _OPENMP
#pragma omp parallel for collapse(2)
#endif
  for(size_t iix=0;iix<N;iix++)
    for(size_t iiy=0;iiy<N;iiy++)
      printf("%i\n",(int) (iix+iiy*iiy));

  return 0;
}


No errors arise with -Wall -fopenmp, but with added -O2 


$ g++ -O2 -Wall  -fopenmp test.cpp 
test.cpp: In function ‘<built-in>’:
test.cpp:11:3: warning: ‘.count.6’ may be used uninitialized in this function [-Wmaybe-uninitialized]
   for(size_t iix=0;iix<N;iix++)
   ^
test.cpp:11:3: note: ‘.count.6’ was declared here
   for(size_t iix=0;iix<N;iix++)
   ^
test.cpp:11:3: warning: ‘.count.7’ may be used uninitialized in this function [-Wmaybe-uninitialized]
   for(size_t iix=0;iix<N;iix++)
   ^
test.cpp:11:3: note: ‘.count.7’ was declared here
   for(size_t iix=0;iix<N;iix++)
   ^