title: How to use Cling to tinker with a large C++ library in a REPL?
body: <p>Cling sounds like a great way to tinker around with a the API of a large library for learning purposes. Unfortunately, there is no documentation or tutorials on how to even get started with this.  I kept running into missing symbols, and having to use C++filt and rgrep over the sources over and over again to figure out what library or header to load, until I gave up.  </p>
  
  <p>Is the right strategy to JIT the entire library from the sources, or should you link in a pre-built library?  </p>