How do I link object files in C? Fails with “Undefined symbols for architecture x86_64”

Question

So I\'m trying trying to use a function defined in another C (file1.c) file in my file (file2.c). I\'m including the header of file1 (file1.h) in order to do this.

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Answer 1

You could compile and link in one command:

gcc file1.c file2.c -o myprogram

And run with:

./myprogram

But to answer the question as asked, simply pass the object files to gcc:

gcc file1.o file2.o -o myprogram