How dependency works

Suppose that you have gone through the process of compiling the program, and while you are testing the program, you realize that one function in io.c has a bug in it. You edit io.c to fix the bug.

The figure above shows io.c outlined in red. By going up the graph, you notice that io.o needs to be updated because io.c has changed. Similarly, because io.o has changed, project1 needs to be updated as well.

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