COmpiler switch conditional log function ??

Hi guys,

Using Borland cpp Builder 4.x

I want to do the following :

- Add debug logging features to my code which can be built via a compiler switch.

- For this I would like one or two dedicated functions.  e.g.
Log.AddToLogFile(char *Message) ;

Questions :

- How do I best use the compiler switch ?  Add in the main .h file ??

- I can of course place a switch before and after every time I call the function.  e.g. :

#if LogSwitch
Log.AddToLogFile(char *Message) ;
#endif

But this would require me to add three lines per call.

I can also add the swithc in the function itself :
e.g. :
void AddToLogFile (char * Message)
{
#if LogSwitch
LogToFile (file,Message) ;
#endif
}

But won't this slow down code that is built without the switch ?? Each time calling this function ??

The idea is to have one or more functions that do the logging but which can be switched off easily without any performance penalty when switched off ??

Thanks