There is no direct method for this but if you look at the libraries supplied with DC you will see how they use a macro to allow you turn on and off debug for each library.
For example, ip.lib has the following:
#define _ip_nodebug __debug
#define _ip_nodebug __nodebug
Each function then has _ip_nodebug as a prefix so you can turn on and off debug for the lib by defining the IP_DEBUG macro if you want debugging or leaving it undefined if you do not.