C++: Compiler and Linker functionality

Question

I want to understand exactly which part of a program compiler looks at and which the linker looks at. So I wrote the following code:

#include          


        

Answer 1

Ah, but you could have NonDefinedFunction(int) in another compilation unit.

The compiler produces some output for the linker that basically says the following (among other things):

• Which symbols (functions/variables/etc) are defined.
• Which symbols are referenced but undefined. In this case the linker needs to resolve the references by searching through the other modules being linked. If it can't, you get a linker error.