DEBUG_LEVEL
_nc_tracing |= DEBUG_LEVEL(n)
#define DEBUG(n, a) if (_nc_tracing >= DEBUG_LEVEL(n)) _tracef a
if (_nc_tracing >= DEBUG_LEVEL(8)) {
if (_nc_tracing >= DEBUG_LEVEL(7)) {
if (_nc_tracing >= DEBUG_LEVEL(1)) {
if (fp == 0 && !MyInit && _nc_tracing >= DEBUG_LEVEL(1))
if (_nc_tracing > DEBUG_LEVEL(2)) \
else if (_nc_tracing == DEBUG_LEVEL(2)) \
if (_nc_tracing >= DEBUG_LEVEL(level)) {