gcc/testsuite/gcc.dg/torture/builtin-sprintf.c

   1 /* PR tree-optimization/86274 - SEGFAULT when logging std::to_string(NAN)
   2    { dg-do run }
   3    { dg-options "-O2 -Wall" }
   4    { dg-additional-options "-Wl,-u,_printf_float" { target newlib_nano_io } } */
   5
   6 #define X        "0xdeadbeef"
   7 #define nan(x)   __builtin_nan (x)
   8
   9 volatile double nan_0 = nan ("0");
  10 volatile double nan_x = nan (X);
  11
  12 int main (void)
  13 {
  14   char buf[80];
  15
  16   /* Verify that folded results match those of the library calls.  */
  17   int cst_n_0 = __builtin_sprintf (buf, "%g", nan ("0"));
  18   int cst_n_x = __builtin_sprintf (buf, "%g", nan (X));
  19
  20   int var_n_0 = __builtin_sprintf (buf, "%g", nan_0);
  21   int var_n_x = __builtin_sprintf (buf, "%g", nan_x);
  22
  23   if (cst_n_0 != var_n_0)
  24     __builtin_abort ();
  25
  26   if (cst_n_x != var_n_x)
  27     __builtin_abort ();
  28
  29   return 0;
  30 }