[Python-Dev] Debian/alpha test_math failures (original) (raw)

Mark Dickinson dickinsm at gmail.com
Wed Apr 30 23:06:01 CEST 2008

Hello all, test_math is currently failing on the Debian/alpha buildbots (trunk and py3k). I've been trying, unsuccessfully, to figure out what's going wrong, and I'm starting to run out of ideas, so I thought I'd ask the list for help to see if anyone has any useful suggestions.

Details of the failure: running the following code:

from math import log ar = 9.88e-324 x = log(ar)

produces:

ValueError: math domain error

Somehow, it looks like errno is getting set to something nonzero in math_1_from_whatever in mathmodule.c, but I really can't figure out how.

I've tried adding '-mieee' to the gcc compile flags, and I've added a bunch of autoconf tests to verify that log(9.88e-324) succeeds, produces roughly the right result, and doesn't set errno to anything nonzero. All the autoconf tests that should pass do. So I can't find anything wrong with the libm implementation of log.

test_math is fine on Tru64/alpha.

Does anyone have access to a Linux/alpha machine, and a few minutes to figure out exactly what's failing? Or any suggestions about what might be failing. I'm open to wild ideas at this point... :-)

Mark -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20080430/abd62b60/attachment.htm>

More information about the Python-Dev mailing list