'make' does not recompile when source file has been edited

Question

I\'m writing a little implementation of Conway\'s Game of Life in C. The source code is split in three files: main.c and functions.c/function

Answer 1

Because you haven't told it that recompilation depends on functions.h.

Try adding this to your Makefile:

%.o : functions.h

Alternatively, modify your existing rule to be:

%.o : %.c functions.h
    $(CC) -c $< -o $@