CPIP is a C/C++ pre-processor implemented in Python. Instead of regard pre-processing as a dirty job that just has to be done as quickly as possible CPIP records every detail of preprocessing for inspection.
Have a look at CPIP’s pre-processing visulisation of the Linux Kernel file: cpu.c.
NOTE: CPIP’s project page has now moved to https://github.com/paulross/cpip. This is no reflection on Sourceforge, indeed I am very grateful for them hosting CPIP for may years. It is merely because I can't manage two workflows! The original project page is here: https://sourceforge.net/projects/cpip/
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