Question

I have a linking error which I’m supposed to fix using the nm command on Unix.

If I have the following linking error: undefined reference to 'program_name', and when running nm on that object file, program_name symbol is shown as follows in the symbol table: U program_name.

I know program_name is undefined, and is defined in another object file which needs to be included with the original object file. My question is: how can I find which object file it is? Is that possible? I have a bunch of object files in a directory and it would be one of them. There’s way too many to try all of them.

Answer 1

You can do this:

$ nm *.o 

Look for program_name in the output (assuming you have a .o extension on your object files).