[Python-Dev] ints not overflowing into longs?

[Derek Shockey]

You're right; among my many tests I think I muddled the situation with
a stray CFLAGS variable in my environment. Apologies for the
misinformation. The current MacPorts portfile does not add -fwrapv.
Adding -fwrapv to OPT in the Makefile solves the problem. I confirmed
by manually building the v2.7.2 tag with clang and -fwrapv, and the
overflow behavior is correct. I've notified the MacPorts package
maintainer.


-Derek

On Thu, Nov 3, 2011 at 11:07 AM, Stefan Krah <stefan at bytereef.org> wrote:
> Derek Shockey <derek.shockey at gmail.com> wrote:
>> I believe you're right. The 2.7.2 MacPorts portfile definitely passes
>> the -fwrapv flag to clang, but the bad behavior still occurs with
>> exponents.
>
> Really? Even without the fix for issue12973 the -fwrapv flag
> should be sufficient, as reported in issue13061 and Issue11149.
>
> For clang version 3.0 (trunk 139691) on FreeBSD this is the case.
>
>
> Stefan Krah
>
>
> _______________________________________________
> Python-Dev mailing list
> Python-Dev at python.org
> http://mail.python.org/mailman/listinfo/python-dev
> Unsubscribe: http://mail.python.org/mailman/options/python-dev/derek.shockey%40gmail.com
>