_dl_debug_vdprintf (_dl_debug_fd, 1, fmt, arg);
_dl_debug_vdprintf (GL(dl_debug_fd), 1, fmt, arg);
_dl_debug_printf (const char *fmt, ...){  va_list arg;  va_start (arg, fmt);  _dl_debug_vdprintf (_dl_debug_fd, 1, fmt, arg);  va_end (arg);}