9.4. Are we debugging?

To test whether the debugging output of class yyy on channel xxx is enabled, use:

TRACE_ON  to test if TRACE is enabled
WARN_ON   to test if WARN is enabled
FIXME_ON  to test if FIXME is enabled
ERR_ON    to test if ERR is enabled
        

Examples:

if(TRACE_ON(atom)){
  ...blah...
}
        

Note: You should normally need to test only if TRACE_ON. At present, none of the other 3 tests (except for ERR_ON which is used only once!) are used in Wine.