Interfacing with C - undefined reference

[k0zmo]

GNU linkers (both default ld and gold) requires specific order of its inputs: 
    
    
     gcc -o m -Inimcache main.c libnim.a
    
    
    Run

main.c has a dependency on symbols from libnim.a thus it needs to come before 
libnim.a in a linking invocation. In your case the linker sees only unused 
symbols from libnim.a and tosses it out. Only then it reads contents from 
main.c, sees symbols it can't resolve (libnim.a is now out of the picture) and 
gives you linker errors.