title: Using doxygen to create (through graphviz's dot) a graphical representation of the entire program
body: <p>A stack overflow thread (found through google of course) directed me to use doxygen to auto-create documentation (originally because I inherited a code base that was to be diagrammed, and I got tired of doing it by hand through Dia Diagram Editor).</p>
  
  <p>Now doxygen has turned out to be really quite useful. However there is one thing I still can't seem to make it do: generate an include (or call) diagram for the entire code base. It'll generate an include hierarchy for a single file, or a call diagram for a single function, but I want to see the whole thing (it's not a very large code base :D ).</p>
  
  <p>Anyone happen to know?</p>
  
  <p>P.S. this in C, but I doubt it matters.</p>