[Pythonmac-SIG] Missing symbols in module compiled with distutils

[Tom Birch]

I just tried with the Python2.4.3 binary release for OSX from  
python.org and i get the same error

cheers,
Tom

On 19/06/2006, at 20:30:22, Tom Birch wrote:

> I'm just playing around with writing a Python wrapper for SearchKit,
> and when I was just getting the very basics down of the first class,
> I ran into this problem when importing my module:
>
> ImportError: Failure linking new module: /Library/Frameworks/
> Python.framework/Versions/2.4/lib/python2.4/site-packages/
> pysearchkit.so: Symbol not found: _CFRelease
>    Referenced from: /Library/Frameworks/Python.framework/Versions/2.4/
> lib/python2.4/site-packages/pysearchkit.so
>    Expected in: dynamic lookup
>
> I went and double-checked my setup.py file:
>
> module1 = Extension('pysearchkit',
>                      extra_link_args = ['-framework CoreServices', '-
> framework CoreFoundation'],
>                      sources = ['module.c','index.c'])
>
> but I couldn't find any problem. I looked at the last link command
> and it seemed ok, I tried running it again manually and it didn't  
> work:
>
> % gcc -bundle -undefined dynamic_lookup build/temp.darwin-8.6.0-
> Power_Macintosh-2.4/module.o build/temp.darwin-8.6.0-
> Power_Macintosh-2.4/index.o -o build/lib.darwin-8.6.0-
> Power_Macintosh-2.4/pysearchkit.so -framework CoreServices -framework
> CoreFoundation
> /usr/bin/ld: flag: -undefined dynamic_lookup can't be used with
> MACOSX_DEPLOYMENT_TARGET environment variable set to: 10.1
> collect2: ld returned 1 exit status
>
> so I fixed that with adding 'MACOSX_DEPLOYMENT_TARGET=10.4' to the
> start, and it worked:
>
> % MACOSX_DEPLOYMENT_TARGET=10.4 gcc -bundle -undefined dynamic_lookup
> build/temp.darwin-8.6.0-Power_Macintosh-2.4/module.o build/
> temp.darwin-8.6.0-Power_Macintosh-2.4/index.o -o build/
> lib.darwin-8.6.0-Power_Macintosh-2.4/pysearchkit.so -framework
> CoreServices -framework CoreFoundation
> %
>
> Running 'sudo python setup.py install' after this results in an
> installed module that imports correctly, so I was wondering exactly
> what the issue is. I'm sure it's something to do with the environment
> passed to the link command, but a look at
> distutils.sysconfig.get_config_vars() didn't show up anything
> interesting (although I'm not an expert on ld). I was wondering if
> anyone had an idea as to why this is broken. I'm running python2.4 on
> ppc (installed as a framework), and interestingly enough it works
> fine with python2.3. Could this be a problem with my python2.4
> install? I haven't had any problems with PyObjC and that seems to
> link things the same way as I am (and uses plenty of stuff in
> frameworks) so I'm at a complete loss as to what's happening here.
>
> The source for everything is available here if you want to try and
> replicate it:
> http://www.cse.unsw.edu.au/~tbirch/pysearchkit.tar.bz2
>
> cheers,
> Tom
> _______________________________________________
> Pythonmac-SIG maillist  -  Pythonmac-SIG at python.org
> http://mail.python.org/mailman/listinfo/pythonmac-sig