Undefined symbols for architecture x86_64:
"_get_string", referenced from:
_main in hello-63ed8b.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [hello] Error 1
Undefined symbols for architecture x86_64: "_get_string", referenced from: _main in hello-63ed8b.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [hello] Error 1