llvm-gcc-4.2/gcc/testsuite/gcc.dg/pr27639.c

/* { dg-do compile } */
/* { dg-options "-O2 -std=c99" } */

char heap[50000];

int
main ()
{
  for (unsigned ix = sizeof (heap); ix--;)
    heap[ix] = ix;
  return 0;
}