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

I assume you are using gcc, to simply link object files do:

$ gcc -o output file1.o file2.o

To get the object-files simply compile using

$ gcc -c file1.c

this yields file1.o and so on.

If you want to link your files to an executable do

$ gcc -o output file1.c file2.c