[Pythonmac-SIG] problems with boost.python on OS X

[Ronald Oussoren]

On 6 Feb, 2007, at 17:55, stephan nies wrote:

> Hello,
>
> has anyone used boost.python on OSX
> and can help me or point me
> to "hello world"-style example of a
> c++ - extension in boost.python
> that works on OSX.
>
> I have used boost.python on linux and
> am porting the app from linux to osx.
> Since the app uses a
> boost.python - extension module
> its essential for me to get the extension
> working.
>
> At the Moment everything compiles
> but i cant import the extension in python.
>
> I already posted on C++-sig but didn't get response so far.
> http://mail.python.org/pipermail/c++-sig/2007-February/011918.html
>
>
> My Situation:
>
> OS:        PPC Mac OS X 10.4.8
> Python:   python-2.4.4-macosx2006-10-18.dmg
>              from http://pythonmac.org/packages/py24-fat/dmg/
>              (this is a framework build)
> Boost:    1.33.1 build from source (./configure && make)
>
> i am building my extension by invoking:
>
> g++ -dynamic myextension.cpp
> -I/Library/Frameworks/Python.framework/Headers
> -I/System/Library/Frameworks/GLUT.framework/Headers -I/usr/include
> -I/Users/nies/src/boost_1_33_1 -c -o myextension.o
>
> and
>
> g++ -v -dynamiclib -framework Python -framework OpenGL -framework GLUT
> -L/Users/nies/src/boost_1_33_1/bin/boost/libs/python/build/ 
> libboost_python.dylib/darwin/release/shared-linkable-true/
> -lboost_python-1_33_1 myextension.o -o myextension.dylib
>
> this compiles and when i try to import the extension in pythonw:
>
> Python 2.4.4 (#1, Oct 18 2006, 10:34:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import myextension
> Traceback (most recent call last):
>  File "<stdin>", line 1, in ?
> ImportError: No module named myextension
>
> as far as i understand this is because python searches for
> .so files.  when i symbolic-link  myextension.so -> myextension.dylib
> and than try to import:
>
> Python 2.4.4 (#1, Oct 18 2006, 10:34:39)
> [GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import myextension
> Traceback (most recent call last):
>  File "<stdin>", line 1, in ?
> ImportError: Inappropriate file type for dynamic loading
>
> so what am i doing wrong here? I would really
> appreciate some hints at this point.


Why not use distutils for building the extension? Distutils knows how  
to build extensions correctly on a multitude of platforms.

Ronald