[issue9920] test_cmath on atan fails on AIX

[Sébastien Sablé]

New submission from Sébastien Sablé <sable at users.sourceforge.net>:

test_cmath will fail with the following error on AIX:

======================================================================
FAIL: test_specific_values (test.test_cmath.CMathTests)
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Traceback (most recent call last):
  File "/san_cis/home/cis/buildbot/buildbot-aix6/py3k-aix6-xlc/build/Lib/test/test_cmath.py", line 350, in test_specific_values
    msg=error_message)
  File "/san_cis/home/cis/buildbot/buildbot-aix6/py3k-aix6-xlc/build/Lib/test/test_cmath.py", line 94, in rAssertAlmostEqual
    'got {!r}'.format(a, b))
AssertionError: atan0000: atan(complex(0.0, 0.0))
Expected: complex(0.0, 0.0)
Received: complex(0.0, -0.0)
Received value insufficiently close to expected value.


There is a test concerning tanh in configure, which may be related:
checking whether tanh preserves the sign of zero... yes

----------
components: Library (Lib)
messages: 117141
nosy: sable
priority: normal
severity: normal
status: open
title: test_cmath on atan fails on AIX
type: behavior
versions: Python 2.7, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9920>
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