I’m implementing a custom SdFat class I created, and to do that I need to disable the preprocessor. However, once I do that I start getting a whole host of other issues. From what I can tell, the compiler no longer realizes that I am declaring functions after I try to use them in the code. For example, I create a Timer object that calls writeBulkData(), which I define later in my code. The code runs fine normally, but if I disable the preprocessor I get errors saying I haven’t declare several functions. If I move the declarations up, most of the errors go away.
Regardless, can someone tell me what the preprocessor does, and what are the implications of disabling it?