#include <stdio.h>
 
#define DEBUG 1
//#define MYDEF 1
//#define YOURDEF 1
 
#define TRACE(x) do { if (DEBUG) printf x; } while (0)
 
#ifdef MYDEF
 
#define IF_MY(x,y) x y
 
#else
 
#define IF_MY(x,y) x
 
#endif
 
#ifdef YOURDEF
 
#define IF_MY_YOUR(x,y,z) IF_MY(x,y) z
 
#else
 
#define IF_MY_YOUR(x,y,z) IF_MY(x,y)
 
#endif
 
int main(void) {
    char *msg="aaa";
    TRACE((IF_MY_YOUR("Message: %s", " Additional stuff ", " More stuff ")"\n", msg));
	return 0;
}
 

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