gcc/testsuite/g++.dg/torture/stackalign/check.h

#include <stddef.h>
#ifdef DEBUG
#include <stdio.h>
#endif

#ifdef  __cplusplus
extern "C" void abort (void);
#else
extern void abort (void);
#endif

int
check_int (int *i, int align)
{
  *i = 20;
  if ((((ptrdiff_t) i) & (align - 1)) != 0)
    {
#ifdef DEBUG
      printf ("\nUnalign address (%d): %p!\n", align, i);
#endif
      abort ();
    }
  return *i;
}

void
check (void *p, int align)
{
  if ((((ptrdiff_t) p) & (align - 1)) != 0)
    {
#ifdef DEBUG
      printf ("\nUnalign address (%d): %p!\n", align, p);
#endif
      abort ();
    }
}