creating a dylib for a plugin with external classes

[themolecule]

I am able to create a plugin interface and link it, and the pluginLoader likes it, but if I try to include any classes from my main app, it won't link.

I would really like something like:

#include <C.h>
 
class A : public AInterface
{
   public:
       C *instance() { return new B(); }
};
 
class B : public C
{
    B() {}
};
 
Q_EXPORT_PLUGIN2(app_A, A)

#include <C.h>

class A : public AInterface
{
   public:
       C *instance() { return new B(); }
};

class B : public C
{
    B() {}
};

Q_EXPORT_PLUGIN2(app_A, A)

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but I cannot figure out a way to get C.o to link when I create the dylib. It doesn't seem to make sense to add a LIBS line to the .pro that points to the .o file in:

[objectsdir]/Release/*build/Objects-normal/i386/C.o

because it doesn't feel right -- if I change machines, OSs, or distros it will break.

How do I get this link to work?