[issue1621] Do not assume signed integer overflow behavior

[Guido van Rossum]

Guido van Rossum added the comment:

Marc-Andre: what do you mean by breaking lots and lots of extensions? 
Extensions also contain buffer overflow checks (at least I hope they do
:-) and those should also be guaranteed safe by using -fwrapv or
-fno-strict-overflow (GCC 4.2 and higher) until we're sure there aren't any.

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