[Python-Dev] ints not overflowing into longs?

Derek Shockey derek.shockey at gmail.com
Thu Nov 3 21:30:18 CET 2011

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


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
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