I've been looking at this again because of new duplicate reports.


I think we need to distinguish between amd64 and x86_amd64/x86_ia64.
But using arch="x86" as the default parameter would do fine.


Re unit test:

The test will only work if 64-bit tools from the SDK are present, and
I'm not sure how to test for that other than writing an independent
find_vcvarsall2 function that checks on the first one.

I have to say that I'm using Linux 99.9% of the time, so perhaps
a Windows expert could suggest a registry based solution.