[gentoo-catalyst] sem_open inconsistency in installed Python versions

["W. Trevor King" <wking@tremily.us>]

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I've been bumping into failures installing Matplotlib 1.2.0-r2:

  # cat /tmp/livecd-stage1.log
  …
  /build/lib/matplotlib/tests/baseline_images/test_delaunay
  Traceback (most recent call last):
    File "/usr/lib/python3.2/multiprocessing/synchronize.py", line 54, in <module>
      from _multiprocessing import SemLock
  ImportError: cannot import name SemLock
  …
  ImportError: This platform lacks a functioning sem_open implementation,
   therefore, the required synchronization primitives needed will not function,
   see issue 3770.
  …

Looking through my logs, it seems that some versions of Python 3.2.3
found a sem_open implementation, but some did not:

  $ cd /var/log/catalyst
  $ grep sem_open dev-lang\:python-3.2.3\:*
  dev-lang:python-3.2.3:20130310-213508.log:checking for sem_open... yes
  dev-lang:python-3.2.3:20130310-222606.log:checking for sem_open... no
  dev-lang:python-3.2.3:20130310-234410.log:checking for sem_open... yes

I cleaned out my logs before my last run, so we can match those build
times up with stages:

  $ grep dev-lang/python-3.2.3 /tmp/*.log
  /tmp/stage1.log:>>> Emerging (14 of 17) dev-lang/python-3.2.3
  /tmp/stage1.log:>>> Installing (14 of 17) dev-lang/python-3.2.3
  /tmp/stage1.log:>>> Emerging (72 of 75) dev-lang/python-3.2.3 for /tmp/stage1root/
  /tmp/stage1.log:>>> Installing (72 of 75) dev-lang/python-3.2.3 to /tmp/stage1root/
  /tmp/stage3.log:>>> Emerging (99 of 189) dev-lang/python-3.2.3
  /tmp/stage3.log:>>> Installing (99 of 189) dev-lang/python-3.2.3

So the stage1 seed_update emerge finds sem_open, but the stage1root
setup does not.  I'm not sure why this would happen, but since the
stage3 emerge *does* find sem_open, I'm not sure why the Matplotlib
emerge is failing in livecd-stage1.  Does anyone want to take a guess?

Thanks,
Trevor

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