[issue1621] Do not assume signed integer overflow behavior

[Ismail Donmez]

Ismail Donmez added the comment:

To Neal,

Can you try with -Wstrict-overflow=3 , but yes I am using gcc 4.3 trunk.

To Guido,

I'll check _csv.c issue closely. Shall I create the new bug reports or
will reviewers will do so and CC me maybe?

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