[CMake] Graphviz support in CMake

[Filipe Sousa]

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Andy Cedilnik wrote:
> Hello,
> 
> I got tired of tracing dependencies between libraries by hand, so I 
> added support in CMake to dump out a graphviz file of all dependencies 
> between libraries. Example can be seen here:
> 
> http://www.cmake.org/Wiki/CMake:For_CMake_Hackers
> 
> To use it, run cmake in the build tree:
> 
> cmake --graphviz=test.dot .

Please, add it to cmake --help

> Ok, current issues:
> 1. If you have too many targets (like VTK, ITK, and pretty much anything 
> else) you will not see anything
> 2. All things are same color, so no way to differentiate
> 3. No differentiation between full path to the library and library itself
> 4. Layout could be improved

Another problem I see is with TARGET_LINK_LIBRARIES(target debug
debug_lib optimized opt_lib). Only one of the libraries is used but both
appear in graphviz (See PndK.dot)

> Look at it and give me suggestions.

Instead of cmake --graphviz=test.dot . wouldn't be better make graphviz,
the name of the output file would be the name of the project.


- --
Filipe Sousa
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