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kit
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6_5_2_2_01_builtin_nan.c (360B)

      1 /* __builtin_nan / __builtin_nanf produce quiet NaNs (the expansion of
      2  * <math.h>'s NAN). A NaN compares unequal to itself, so both self-comparisons
      3  * are true. No sysroot needed. */
      4 int test_main(void) {
      5   double n = __builtin_nan("");
      6   float nf = __builtin_nanf("");
      7   /* NaN != NaN must hold for both widths. */
      8   return (n != n && nf != nf) ? 42 : 0;
      9 }