#ifdef tool?

[Michael Dorin]

Anybody know of a tool that could strip unused ifdefs right from your code?

Something that could look at your include path and your -D's and generate
a source file, with comments, with all the undefined code removed?

Could you do this with the cpp?

If have a collection of code with lots of #ifdefs.  I would really like
to be able easily see what I am compiling.  

Thanks for any advice.

-Mike 



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