/* The first occurrence of EXPR is not evaluated due to the sizeof,
   but will trigger any pedantic warnings masked by the __extension__
   for the second occurrence.  The ternary operator is required to
   support function pointers and bit fields in this context, and to
   suppress the evaluation of variable length arrays.  */
#  define assert(expr)
  ((void) sizeof ((expr) ? 1 : 0), __extension__ ({
      if (expr)
        ; /* empty */
      else
        __assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION);
    }))

#  define assert(expr)
  ({
      if (expr)
           ; /* empty */
      else
           __assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION);
    })