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"SO" config var not getting set #63754

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"SO" config var not getting set#63754
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warsaw
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stdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

Description

@msabramo
msabramo
mannequin
opened on Nov 11, 2013
BPO 19555
Nosy @warsaw, @doko42, @vstinner, @msabramo
Files
  • issue19555.txt
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = 'https://github.com/warsaw'
closed_at = <Date 2013-11-22.16:09:39.550>
created_at = <Date 2013-11-11.17:29:57.624>
labels = ['type-bug', 'library']
title = '"SO" config var not getting set'
updated_at = <Date 2014-03-09.22:50:24.773>
user = 'https://github.com/msabramo'

    bugs.python.org fields:

    activity = <Date 2014-03-09.22:50:24.773>
actor = 'python-dev'
assignee = 'barry'
closed = True
closed_date = <Date 2013-11-22.16:09:39.550>
closer = 'barry'
components = ['Distutils']
creation = <Date 2013-11-11.17:29:57.624>
creator = 'Marc.Abramowitz'
dependencies = []
files = ['32577']
hgrepos = []
issue_num = 19555
keywords = []
message_count = 12.0
messages = ['202634', '202637', '202638', '202639', '202648', '202649', '202650', '203701', '203735', '203793', '203865', '212996']
nosy_count = 5.0
nosy_names = ['barry', 'doko', 'vstinner', 'python-dev', 'Marc.Abramowitz']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue19555'
versions = ['Python 3.4']

    Activity

    1. msabramo commented on Nov 11, 2013

      @msabramo
      msabramomannequin
      on Nov 11, 2013
      MannequinAuthor

      I just installed Python 3.0a4 from source on an Ubuntu system and noticed that it doesn't seem to set the distutils.sysconfig config var: "SO":

      vagrant@ubuntu:~/src/Python-3.4.0a4$ python3.4
Python 3.4.0a4 (default, Nov 11 2013, 17:11:59)
[GCC 4.6.3] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from distutils import sysconfig
>>> sysconfig.get_config_var("SO")
>>> sysconfig.get_config_var("SO") is None
True

      This worked fine for me in Python 3.3:

      vagrant@ubuntu:~/src/Python-3.4.0a4$ python3.3
Python 3.3.2 (default, May 16 2013, 18:32:41)
[GCC 4.6.3] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from distutils import sysconfig
>>> sysconfig.get_config_var("SO")
'.so'
    2. msabramo
      assigned
      merwok
      on Nov 11, 2013
    3. msabramo
      added
      stdlibStandard Library Python modules in the Lib/ directory
      type-bugAn unexpected behavior, bug, or error
      on Nov 11, 2013
    4. brettcannon
      unassigned
      merwok
      on Nov 11, 2013

    5. warsaw commented on Nov 11, 2013

      @warsaw
      warsaw
      on Nov 11, 2013
      Member

      Indeed, this happens for me too in default head.

    6. warsaw commented on Nov 11, 2013

      @warsaw
      warsaw
      on Nov 11, 2013
      Member

      Never mind, this is an intentional change:

      • Issue bpo-16754: Fix the incorrect shared library extension on linux. Introduce
        two makefile macros SHLIB_SUFFIX and EXT_SUFFIX. SO now has the value of
        SHLIB_SUFFIX again (as in 2.x and 3.1). The SO macro is removed in 3.4.

      Although this does introduce some backward compatibility issues. Perhaps sysconfig.get_config_var('SO') should be deprecated in 3.4 and removed in 3.5.

    7. msabramo commented on Nov 11, 2013

      @msabramo
      msabramomannequin
      on Nov 11, 2013
      MannequinAuthor

      Thanks Barry, for tracking down that this is intentional.

      I wonder how one gets this value in Python code now? For example, the reason I stumbled upon this in the first place is that there is some code in PyCrypto (https://github.com/dlitz/pycrypto/blob/master/lib/Crypto/SelfTest/PublicKey/test_RSA.py#L464) that uses get_config_var("SO") thusly:

          except ImportError:
        from distutils.sysconfig import get_config_var
        import inspect
        _fm_path = os.path.normpath(os.path.dirname(os.path.abspath(
            inspect.getfile(inspect.currentframe())))
            +"/../../PublicKey/_fastmath"+get_config_var("SO"))
        if os.path.exists(_fm_path):
            raise ImportError("While the _fastmath module exists, importing "+
                "it failed. This may point to the gmp or mpir shared library "+
                "not being in the path. _fastmath was found at "+_fm_path)

      What would be the way to express this now in Python >= 3.4?

    8. warsaw commented on Nov 11, 2013

      @warsaw
      warsaw
      on Nov 11, 2013
      Member

      Here's a patch, sans NEWS and any docs.

    9. warsaw
      changed the title [-]"SO" config var not getting set[/-] [+]SO configuration variable should be deprecated in 3.4[/+] on Nov 11, 2013

    10. warsaw commented on Nov 11, 2013

      @warsaw
      warsaw
      on Nov 11, 2013
      Member

      Note that obviously the DeprecationWarning is not raised if you do

      sysconfig.get_config_vars()['SO']

      but it still gets mapped to EXT_SUFFIX in that case.

    11. warsaw commented on Nov 11, 2013

      @warsaw
      warsaw
      on Nov 11, 2013
      Member

      On Nov 11, 2013, at 06:27 PM, Marc Abramowitz wrote:

      What would be the way to express this now in Python >= 3.4?

      For now, use sysconfig.get_config_var('EXT_SUFFIX') though if no one objects
      to my patch, I'll restore 'SO' for 3.4. We'll add a DeprecationWarning and
      get rid of it in 3.5.

    12. warsaw
      changed the title [-]SO configuration variable should be deprecated in 3.4[/-] [+]"SO" config var not getting set[/+] on Nov 11, 2013

    13. python-dev commented on Nov 21, 2013

      @python-dev
      python-devmannequin
      on Nov 21, 2013
      Mannequin

      New changeset fedc2b8fbb6e by Barry Warsaw in branch 'default':

    14. warsaw
      closed this as completedon Nov 22, 2013

    15. vstinner commented on Nov 22, 2013

      @vstinner
      vstinner
      on Nov 22, 2013
      Member

      Test is failing on Windows:

      http://buildbot.python.org/all/builders/x86%20Windows%20Server%202003%20%5BSB%5D%203.x/builds/1758/steps/test/logs/stdio

      ======================================================================
      ERROR: test_SO_in_vars (test.test_sysconfig.TestSysConfig)
      ----------------------------------------------------------------------

      Traceback (most recent call last):
  File "E:\Data\buildslave\cpython\3.x.snakebite-win2k3r2sp2-x86\build\lib\test\test_sysconfig.py", line 388, in test_SO_in_vars
    self.assertIsNotNone(vars['SO'])
KeyError: 'SO'

      ======================================================================
      FAIL: test_SO_value (test.test_sysconfig.TestSysConfig)
      ----------------------------------------------------------------------

      Traceback (most recent call last):
  File "E:\Data\buildslave\cpython\3.x.snakebite-win2k3r2sp2-x86\build\lib\test\test_sysconfig.py", line 382, in test_SO_value
    sysconfig.get_config_var('EXT_SUFFIX'))
AssertionError: None != '.pyd'
    16. vstinner
      reopened this on Nov 22, 2013
    17. warsaw
      self-assigned this
      on Nov 22, 2013

    18. python-dev commented on Nov 22, 2013

      @python-dev
      python-devmannequin
      on Nov 22, 2013
      Mannequin

      New changeset 331b7a8bb830 by Barry Warsaw in branch 'default':
      A fix for bpo-19555 on Windows.
      http://hg.python.org/cpython/rev/331b7a8bb830

    19. warsaw
      closed this as completedon Nov 22, 2013

    20. python-dev commented on Nov 22, 2013

      @python-dev
      python-devmannequin
      on Nov 22, 2013
      Mannequin

      New changeset 8a130fd92255 by Barry Warsaw in branch 'default':
      bpo-19555 for distutils, plus a little clean up (pyflakes, line lengths).
      http://hg.python.org/cpython/rev/8a130fd92255

    21. python-dev commented on Mar 9, 2014

      @python-dev
      python-devmannequin
      on Mar 9, 2014
      Mannequin

      New changeset ac2ee9fc353a by R David Murray in branch 'default':
      whatsnew: deprecation of sysconfig SO key (bpo-19555).
      http://hg.python.org/cpython/rev/ac2ee9fc353a

    22. ezio-melotti
      transferred this issue fromon Apr 10, 2022
    23. bryanwweber
      added a commit that references this issue on Apr 18, 2022

      Removes SO config variable in sysconfig

      5a55f2b
    24. warsaw
      added a commit that references this issue on Apr 18, 2022

      gh-91670: Removes `SO` config variable in `sysconfig.py` (#91671)

      0860b26
    25. sumslogs
      added 3 commits that reference this issue on Dec 12, 2022

      Fix: Python3 build failure

      d4018b5

      Fix: distutils related build failure in python 3.11, removal in 3.12

      e215efc

      Fix: distutils related build failure in python 3.11, removal in 3.12

      c6fce52
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