[issue1621] Do not assume signed integer overflow behavior

[Ismail Donmez]

Ismail Donmez added the comment:

Neal,

You could btw check
http://repo.or.cz/w/pytest.git?a=shortlog;h=overflow-fix which have each
fix seperate so that reviewing is easy. Just ignore configure changes
thats for later.

Thanks,
ismail

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