[Bug 837221] Re: "Variable referenced before initialization" using Cython 0.15 to compile extensions

[Martin Packman]

Ran an oneiric instance using the following image:

        smoser-cloud-images/ubuntu-oneiric-11.10-amd64-server-20120722

Upgraded bzr and related packaged to 2.4.2 from the -proposed archive:

	Commandline: apt-get upgrade bzr
	Upgrade: byobu:amd64 (4.37-0ubuntu1, 4.37-0ubuntu1.1), unattended-upgrades:amd64 (0.73ubuntu1, 0.73ubuntu1.1), python-bzrlib.tests:amd64 (2.4.1-1ubuntu1, 2.4.2-0ubuntu1), procps:amd64 (3.2.8-10ubuntu5, 3.2.8-10ubuntu5.1), python-bzrlib:amd64 (2.4.1-1ubuntu1, 2.4.2-0ubuntu1), bzr:amd64 (2.4.1-1ubuntu1, 2.4.2-0ubuntu1), libgcrypt11:amd64 (1.5.0-1, 1.5.0-1ubuntu0.1)

To verify that the upgrade from 2.4.1 to 2.4.2 worked as expected, ran
the test suite:

	ubuntu at test:~$ bzr selftest
	bzr selftest: /usr/bin/bzr
	   /usr/lib/python2.7/dist-packages/bzrlib
	   bzr-2.4.2 python-2.7.2 Linux-3.0.0-23-virtual-x86_64-with-Ubuntu-11.10-oneiric
	...
	----------------------------------------------------------------------
	Ran 26912 tests in 1392.984s

	FAILED (failures=1, known_failure_count=34)
	1299 tests skipped

The test failure is some minor apport/vm weirdness in bt.test_crash that
also failed prior to the package upgrade.

** Tags removed: verification-needed
** Tags added: verification-done

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https://bugs.launchpad.net/bugs/837221

Title:
  "Variable referenced before initialization" using Cython 0.15 to
  compile extensions

Status in Bazaar Version Control System:
  Fix Released
Status in Bazaar 2.4 series:
  Fix Released
Status in “bzr” package in Ubuntu:
  Fix Released
Status in “bzr” source package in Oneiric:
  Fix Committed

Bug description:
  I did a test build, upgrading to Cython 0.15 (the current latest).
  They changed the code so that now variables are no longer implicitly
  initialized. eg:

  cdef foo

  if foo is not None:
  ...

  In earlier Cython (and Pyrex) objects were always initialized to None,
  and other variables to a reasonable default (pointers to NULL, etc).

  The one bit I investigated was spurious, the variable was being set by
  a function call as an 'out' parameter. However, there were about 10
  warnings, and it would be nice to be warning free.

  This would apply to older versions of bzr as well, since the windows
  build host uses the same version of Cython across all versions.

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