In a directory by itself, create this file:
Then compile and run it like this:
That works, but what you might not realize is that gcc is actually doing two steps, not one -- compilation, then linking. The compilation stage converts C code into assembly language, the linking stage ties everything together into an executable. Let's break it into two steps:
That's what gcc is ACTUALLY doing... converts the C file into an object file(.o), then links the object file into an executable.
Now let's try and use a function from another .c file. First, create this file:
Then, modify main.c to use it like this:
Finally, let's see what happens when we try and compile it, then link it:
It doesn't work. It compiles it fine since there's no syntax errors in the program, but the function it wants is not in main.o! To get that function, we'll need to give it library.o too.
It works!
Now, if you want your makefile to do that, you need to tell it that the output file needs main.o and library.o. Here's a simple makefile:
With that makefile in the main directory, let's try it:
It works!
So there you go. You'll need to find the .c file that these missing functions reside in, convert it to an object, then link it into your executable.
Last edited by Corona688; 07-11-2006 at 11:25 AM..
Reason: mistake in examples
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