Re: [Pyobjc-dev] objc 2.2 and libxml2?

[Glenn <grp...@so...>]

Thanks Ron.

For the benefit of other newbies like me: I downloaded the pyobjc-core  
tarball from http://pypi.python.org/pypi/pyobjc-core/2.2, cd'ed into  
the unzipped directory and then did the usual sudo setup.py install.  
PyObjC is behaving well for me now as I work through the excellent  
tutorial http://lethain.com/entry/2008/aug/22/an-epic-introduction-to-pyobjc-and-cocoa/ 
  .

Glenn

On Dec 8, 2009, at 12:38 PM, Ronald Oussoren wrote:

>
> On 8 Dec, 2009, at 19:50, Glenn wrote:
>
>> Hi,
>>
>> I've done a framework install of Python 2.6 on OSX10.5 and it works  
>> just fine.
>>
>> To enable Cocoa/Python apps, I've installed pyobjc 2.2 and that  
>> works well enough that the native MacOSX backend in matplotlib runs  
>> properly.
>>
>> However, when I try running my own app with Xcode, I get the  
>> following traceback:
>>
>> [Session started at 2009-12-08 10:24:30 -0800.]
>> Traceback (most recent call last):
>>   File "main.py", line 10, in <module>
>>     import objc
>>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/ 
>> python2.6/site-packages/pyobjc_core-2.2-py2.6-macosx-10.3-fat.egg/ 
>> objc/__init__.py", line 22, in <module>
>>     _update()
>>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/ 
>> python2.6/site-packages/pyobjc_core-2.2-py2.6-macosx-10.3-fat.egg/ 
>> objc/__init__.py", line 19, in _update
>>     import _objc
>> ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/ 
>> 2.6/lib/python2.6/site-packages/pyobjc_core-2.2-py2.6-macosx-10.3- 
>> fat.egg/objc/_objc.so, 2): Library not loaded: /usr/lib/ 
>> libxml2.2.dylib
>>   Referenced from: /Library/Frameworks/Python.framework/Versions/ 
>> 2.6/lib/python2.6/site-packages/pyobjc_core-2.2-py2.6-macosx-10.3- 
>> fat.egg/objc/_objc.so
>>   Reason: Incompatible library version: _objc.so requires version  
>> 10.0.0 or later, but libxml2.2.dylib provides version 9.0.0
>> 2009-12-08 10:24:30.364 py1[960:10b] *** Terminating app due to  
>> uncaught exception 'NSInternalInconsistencyException', reason: '/ 
>> Users/glenn/learningcocoa/py1/main.m:44 main() PyRun_SimpleFile  
>> failed with file '/Users/glenn/learningcocoa/py1/build/Debug/ 
>> py1.app/Contents/Resources/main.py'.  See console for errors.'
>>
>> So, to fix this, I installed the latest version of libxml2.2.dylib  
>> in /usr/local/lib. Unfortunately, subsequent installation of the  
>> latest distribution of Pyobjc doesn't fix the problem:
>>
>> easy_install pyobjc==2.2  =>  /Library/Frameworks/Python.framework/ 
>> Versions/2.6/lib/python2.6/site-packages/pyobjc_core-2.2-py2.6- 
>> macosx-10.3-fat.egg
>>
>> because that contains a precompiled _objc.so that is linked to /usr/ 
>> lib/libxml2.2.dylib.
>>
>> What is the canonical way to get a framework install of pyobjc 2.2  
>> working properly in Python 2.6 on OS-X 10.5? I've read horror  
>> stories about breaking system apps if /usr/lib/libxml2.2.dylib is  
>> messed with.
>
> The release binaries were created on 10.6, which appearently ships  
> with an updated version of libxml.
>
> The easiest workaround for now is to download the source archive of  
> pyobjc-core and install that, easy_install pyobjc==2.2 should then  
> install the framework wrappers.
>
> What really sucks is that both the 10.5 and 10.6 versions of libxml  
> are of the 2.2 branch of libxml, which AFAIK should be binary  
> compatible :-(
>
> Ronald