Removing function calls (potentially OT)

[Kenneth Pronovici]

I guess this is probably somewhat off-topic, but I'm hoping someone here
can point me in the right direction.  I apologize in advance if this is
too off-topic - feel free to take the conversation off the list if need
be.

I have a function:

   LogTrace(char *format, ...);

that is used for tracing.  For potential performance reasons in
production my boss wants the option to remove these calls entirely.  I'd
like to provide an autoconf option --without-tracing that would build a
version of my program with these calls removed, but I'm running into a
brick wall (possibly of my own making).

My initial guess was something like this:

   #ifdef WITHOUT_TRACING
      #define LogTrace
   #endif

However, that definition will turn this:

   LogTrace("%s", variable);

into this:

   ("%s", variable);

which doesn't seem like a good idea although it does seem to compile at
least some of the time.

Anyone have any suggestions on a better way to do this?  Just an example
of a package which does something similar would be a great starting
point.  I'm doing all of this work in ANSI C.

Thanks, and again, I'm sorry if this is too off-topic.
  
KEN

-- 
Kenneth J. Pronovici <address@hidden>
Personal Homepage: http://www.skyjammer.com/~pronovic/
"They that can give up essential liberty to obtain a little 
 temporary safety deserve neither liberty nor safety." 
      - Benjamin Franklin, Historical Review of Pennsylvania, 1759

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