atanl
long double atanl(long double);
return (CMPLXL(x, atanl(y)));
else z=atanl(fabsl(y/x)); /* safe to do y/x */
return atanl(y); /* x=1.0 */
__weak_alias(atanl, _atanl)
__weak_alias(atanl, _atanl)