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
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