[issue7251] Mark expected failures of test_math, test_cmath and test_round as such.

[Mark Dickinson]

Mark Dickinson  added the comment:

Postscript:  the failure Skip reported looks like a duplicate of issue 9069, 
which was tracked down to a gcc compiler bug in gcc 4.4.x (x <= 4) and gcc 
4.5.x (x <= 0).  That compiler bug is now fixed.

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[issue7251] Mark expected failures of test_math, test_cmath and test_round as such.

[Mark Dickinson]

New submission from Mark Dickinson :

There are some buildbot failures due to platform-specific bugs that need
to be marked as expected failures, using the unittest.expectedFailure
decorator.  This may require reorganizing the tests slightly.

* tanh(-0.0) produces 0.0 instead of -0.0 on FreeBSD 6;  this causes
test_math and test_cmath to fail.  E.g.,

http://www.python.org/dev/buildbot/builders/x86%20FreeBSD%20trunk/builds/2741

* the libm round function on Debian alpha seems to be buggy;  this
causes test_round in test_builtin.py to fail.  E.g.,

http://www.python.org/dev/buildbot/builders/alpha%20Debian%20trunk/builds/30

--
assignee: mark.dickinson
components: Tests
keywords: buildbot
messages: 94821
nosy: mark.dickinson
priority: normal
severity: normal
stage: needs patch
status: open
title: Mark expected failures of test_math, test_cmath and test_round as such.
versions: Python 2.7, Python 3.2

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[issue7251] Mark expected failures of test_math, test_cmath and test_round as such.

[Mark Dickinson]

Mark Dickinson  added the comment:

Oops.  I meant 'platform' bugs, not 'platform-specific' bugs.  These are
not bugs in Python, but in the underlying C library.

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[issue7251] Mark expected failures of test_math, test_cmath and test_round as such.

[Skip Montanaro]

Skip Montanaro  added the comment:

For 2.6.4 I get a test_float failure on Solaris as well:

test test_float failed -- Traceback (most recent call last):
 File "/home/tuba/skipm/src/python/Python-2.6.4/Lib/test/test_float.py",
line 765, in test_roundtrip
   self.identical(-x, roundtrip(-x))
 File "/home/tuba/skipm/src/python/Python-2.6.4/Lib/test/test_float.py",
line 375, in identical
   self.fail('%r not identical to %r' % (x, y))
AssertionError: -0.0 not identical to 0.0

Haven't looked at 2.7 or 3.1 yet, but it seems to fall into the same
class of test failures as the tanh(-0.0) critter.

--
nosy: +skip.montanaro

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[issue7251] Mark expected failures of test_math, test_cmath and test_round as such.

[Roumen Petrov]

Roumen Petrov  added the comment:

May be one day python modules will deal with TANH_PRESERVES_ZERO_SIGN
set by configure check.

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nosy: +rpetrov

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[issue7251] Mark expected failures of test_math, test_cmath and test_round as such.

[Mark Dickinson]

Mark Dickinson  added the comment:

The round tests for large values have been broken out into their own test;  
this test is now skipped (only if it would fail) on Linux/alpha.  See 
r76176 (trunk), r76177 (py3k) and r76178 (release31-maint).

The round function itself needs fixing in release26-maint:  issue #7070.

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[issue7251] Mark expected failures of test_math, test_cmath and test_round as such.

[Mark Dickinson]

Mark Dickinson  added the comment:

The round function in release26-maint is fixed (r76179).  I'm not sure 
whether the round_large test needs to be skipped for release26-maint, 
since the Python  2.6 version of round doesn't use the libm round 
function.

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[issue7251] Mark expected failures of test_math, test_cmath and test_round as such.

[Mark Dickinson]

Mark Dickinson  added the comment:

The tanh-related failures are no longer happening, since the FreeBSD 
buildbot was upgraded from FreeBSD 6.2 to FreeBSD 6.4.

I'm still worried by Skip's report, but that's a separate issue.

Closing.

--
resolution:  -> fixed
stage: needs patch -> committed/rejected
status: open -> closed

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