finding the library in which symbol is defined.

[Jeffrey Holle]

Where are the "Py*" symbols defined on my system?
  Good question, and for me a perplexing one.
  I build python 2.3.3, so I have its source directory tree.  No *.so
  files are created in the process of building and installing it.  I
  searched through the entire directory tree for these symbols and the
  only place I find them is either in various *.o files and python, the
  actual executable.
  The only idea I've come up with considering this fact is making a
  libpython.so link to python and see what happens.  Expect the linker to
  crash.  So I have not tried...
  The most recent libpython*.so file I've got on my system is
  libpython2.2.so.  I've tried this and it resolves most, not all,
  problems but I do not mix versions unless explitely instructed to.
  This particular issue is something that I expect I need to get from
  either python or boost.python fokes.  So far no joy.
  The only question I have of you is:
  Is it normal that my simple cpptest exe has an appetite for the "Py*"
  symbols, even though they are required by a used shared library and a
  shared library which it uses?
  I'd like to dramatically simply what I'm creating.  Now it has an
  abstract interface for some 40 classes, plus a pesty class factory
  paridiagn because this was necessary for windows.  As of boost::python
  v2, python  doesn't require it.  The jury on gcc is still out.

The requested output of objdump is attached.


Ian Lance Taylor wrote:
> Jeffrey Holle <jeff.holle@verizon.net> writes:
> 
> 
>>Examples of the specific linker errors that are troubling me:
>>
>>/usr/local/lib/libboost_python.so.1.31.0: undefined reference to
>>`PySequence_DelSlice'
>>/usr/local/lib/libboost_python.so.1.31.0: undefined reference to
>>`PyNumber_InPlaceXor'
>>../cppTest/libUMLModel.so: undefined reference to `PyInt_FromLong'
> 
> 
> Where are those symbols defined on your system?
> 
> If they are defined in, e.g, /usr/lib/libpython.so.*, have you tried
> adding -lpython to your link command?
> 
> What is the output of
>     objdump -p /usr/local/lib/libboost_python.so.1.31.0
> ?
> 
> Ian
> 
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