Hi Kristis, To effect the behavior you want, I'd try to do it this way: #ifdef FIRST_MACRO #define some_function some_other_function #endif Note: for simple function substitution, I use just the identifiers. I don't recommend using a macro function... UNLESS if you need to do something with the parameters, such as change the order around, or remove a parameter, or add a fixed value... well, that's a different can-o'-worms which justifies a macro function. Now if you are trying to get that to happen *IF-AND-ONLY-IF* the FIRST_MACRO is actually *USED*... then you'll have to go through the code and drop in a #define some_function some_other_function after FIRST_MACRO is used, in each source file. Since you'd have to do that, you may as well just change the function itself, in my opinion - six of one, versus half-dozen of the other. HTH, --Eljay
