[issue1608] test_str.py crashes

[Guido van Rossum]

Guido van Rossum added the comment:

It would actually be better to use -fno-strict-overflow instead of
-fwrapv, if it exists (GCC 4.2 and later).

See also http://bugs.python.org/issue1621 which suggests there aren't
actually many places that need this; gcc -Wstrict-overflow should help
auditing the code.

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