librdf | Redland librdf RDF API and triple stores | Data Manipulation library

I am writing a C++ wrapper around a C library. Here is an example of my strategy.

I'm trying to use a C library which basically only exposes typedefs to structs that are used internally. The issue is that I want to use smart pointers to manage the lifetime of the raw pointers which are the interface to the library, but I cannot create the smart pointers because of an incomplete_type error. Note I have asked a previous question previous question trying to solve the same problem but the question turned out to be a poor representation of my actualy problem:

I cannot figure out how to use a smart pointer to the type that I need from the C library. Instead I've been using smart pointers to the underlying raw pointers (see below) but this isn't exactly what I'd like, and probably not ideal.

Here is some code:

I am trying to build a shared library. My aim is to pull all dependencies as static libraries into a single shared library. My understanding is that this can be done with the -Wl,--whole-archiveflag. Here is a snippet of my CMake script responsible for configuring the shared library.

Essentially I am trying to use the redland rdf libraries but I cannot link to them. When I try a simple basic program which uses the redland libraries I get these errors: