[CMake] Graphviz support in CMake

[David Somers]

Hi Andy, et al,

The graphviz support looks interesting, but it seems it only shows library 
dependencies... it would be interesting to be able to generate a graph to 
show the intra-project dependencies, i.e. what targets it makes avaialble and 
their dependencies. (For example, I have a project that makes a few tools 
required during the build, so some targets have those tools as a 
dependency... it would be nice to be able to visualize such things.)

BTW, for a project that has no library dependencies, the dot file generated is 
rather minimal, e.g.

digraph GG {
node [
  fontsize = "12"
];
}

I would have expected to have had one node for the project itself (albeit on 
its own).

Regards

-- 
David Somers
typographer/programmer/whatever