[MacPorts] #31444: MacPorts Python decimal module broken; Python installed from source works correctly

[MacPorts]

#31444: MacPorts Python decimal module broken; Python installed from source works
correctly
---------------------------------+------------------------------------------
 Reporter:  josharian@…          |       Owner:  macports-tickets@…                   
     Type:  defect               |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  ports                |     Version:  2.0.3                                
 Keywords:                       |        Port:  python27                             
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 I noticed very unusual behavior in Python's decimal module, and reported
 it here: http://stackoverflow.com/questions/7590137/dividing-decimals-
 yields-invalid-results-in-python-2-5-to-2-7. It was tracked down to the
 MacPorts Python. I have since found simple reproduction instructions:

 (1) Install MacPorts Python 2.7 (2.5 and 2.6 also work). Run:

 python2.7 -m doctest
 /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/decimal.py

 Result: 6 doctest failures, including simple things like:

 Failed example:
     print Decimal(3).sqrt()
 Expected:
     1.73205080756887729
 Got:
     -8.4467440737095516


 (2) Install Python 2.7 from source (code from
 http://python.org/download/releases/2.7.2/, vanilla configure && make &&
 make install). Run:

 /usr/local/bin/python2.7 -m doctest /usr/local/lib/python2.7/decimal.py

 All doctests pass.


 The decimal.py modules are pure Python, and are identical, so the
 different must be in the compilation of Python itself.


 For reference, my MacPorts Python version reports:

 Python 2.7.2 (default, Sep 13 2011, 13:20:34)
 [GCC 4.2.1 Compatible Apple Clang 3.0 (tags/Apple/clang-211.9)] on darwin

 My from-source Python version:

 Python 2.7.2 (default, Sep 28 2011, 15:37:49)
 [GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00)] on
 darwin


 I'm running OS X 10.6.8. Please let me know what other details I can
 provide to help debug this.

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Ticket URL: <https://trac.macports.org/ticket/31444>
MacPorts <http://www.macports.org/>
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