Message 270371 - Python tracker

Message270371

Author	martin.panter
Recipients	BreamoreBoy, belopolsky, flox, martin.panter, python-dev, vstinner
Date	2016-07-14.05:41:47
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1468474909.35.0.161582020963.issue13312@psf.upfronthosting.co.za>
In-reply-to

Content
If you enable GCC’s -ftrapv option, the subtraction overflow triggers an abort. Alexander’s patch works around the problem for asctime(), but the problem still exists in other cases, such as: >>> time.mktime((-2*31 + 1899, (0,) * 8)) Aborted (core dumped) [Exit 134] Attaching a version of the patch without the conflicting whitespace changes. Why does Python even need to support such extreme time values? It would seem much simpler to raise an exception.

Content

If you enable GCC’s -ftrapv option, the subtraction overflow triggers an abort. Alexander’s patch works around the problem for asctime(), but the problem still exists in other cases, such as:

>>> time.mktime((-2**31 + 1899, *(0,) * 8))
Aborted (core dumped)
[Exit 134]

Attaching a version of the patch without the conflicting whitespace changes.

Why does Python even need to support such extreme time values? It would seem much simpler to raise an exception.

History
Date	User	Action	Args
2016-07-14 05:41:49	martin.panter	set	recipients: + martin.panter, belopolsky, vstinner, flox, BreamoreBoy, python-dev
2016-07-14 05:41:49	martin.panter	set	messageid: <1468474909.35.0.161582020963.issue13312@psf.upfronthosting.co.za>
2016-07-14 05:41:49	martin.panter	link	issue13312 messages
2016-07-14 05:41:49	martin.panter	create