I'm trying to link an outside library in my C++ VS2013 project. Upon compiling the project I get the error:

Error 1 error LNK2019: unresolved external symbol "void __cdecl bar(void)" (?bar@@YAXXZ) referenced in function _main D:\Projects\IncludeOutsideLib\main.obj IncludeOutsideLib

I have setup Configuration Properties->C/C++->Additional Include Directories to point to the outside library folder`$(PROJECTDIR)/../Foo/`. Is there anything else I need to do?

The project/directory structure is very simple

Projects:
    Foo:
        foo.h
        foo.cpp
    IncludeOutsideLib:
        // contains C++ VS2013 project
        main.cpp

foo.h:

   #ifndef FOO_H
    #define FOO_H

    #include <cstdlib>

    void bar();

    #endif // FOO_H

foo.cpp:

#include "foo.h"

    void bar()
    {
        printf("bar\n");
    }

main.cpp:

#include <iostream>
    #include <cstdlib>
    #include "foo.h"

    int main(int argc, char** argv)
    {
        bar();
        system("pause");
        return 0;
    }