[issue2975] VS8 include dirs grow without bound

[Scott Dial]

Scott Dial <scott at scottdial.com> added the comment:

The path gets changed everytime a MSVCCompiler is instantiated. I've
seen the same problem with PATH before with PyPy. I agree this is a bug,
but I don't see how it can be fixed. The problem exists inside of
vcvarsall.bat if I understand this correctly. Furthermore, I don't
understand how an exception could actually be thrown; the vc_env values
are sourced from the environment after running vcvarsall.bat, so how
could they be too long?

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<http://bugs.python.org/issue2975>
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