extern void abort(void);
extern void __assert_fail(const char *, const char *, unsigned int, const char *) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
void reach_error() { __assert_fail("0", "float-to-double2.c", 3, "reach_error"); }

int main(void)
{
  float f   = -0x1.0p-127f;
  double d  = -0x1.0p-127;
  double fp = (double)f;

  if(!(d == fp)) {reach_error();abort();}

  return 0;
}