[Python-bugs-list] [ python-Bugs-832799 ] Please link modules with shared lib

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Bugs item #832799, was opened at 2003-10-29 20:36
Message generated for change (Comment added) made by benson_basis
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Category: Build
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: benson margulies (benson_basis)
Assigned to: Nobody/Anonymous (nobody)
Summary: Please link modules with shared lib

Initial Comment:
We've been working with libraries that are loaded with 
dlopen (on Linux and Solaris, the land of ELF) and 
which, in turn, use the embedded python interpreter.

Due to the behavior of the dynamic linker, this would 
work much better if modules were, by default, linked 
with -lpython2.3 instead of just left with hanging 
undefined symbols. Here's why.

The main executable isn't linked with python, and none 
of it's direct dependents are. So, the python symbols 
aren't in the global namespace.

The dlopened library is linked with python. However, 
when the dlopened library dlopens the modules, the 
linux linker is not clever enough to allow the second-
order library to use symbols from its parent. (Solaris 
has such a feature, but not linux). So, one has to 
manually dlopen the python library with RTLD_GLOBAL 
to make it work.

If each module had a NEED for the python lib (via -l at 
linktime), all this would just work.

I've got some local patches to build_ext.py for this 
purpose, but it would be nice to have official support.


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>Comment By: benson margulies (benson_basis)
Date: 2003-10-31 07:22

Message:
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To turn my patches into things that anyone else would want, 
I need to know what to put in the -L that will be required. At 
the time we're building the main python distro, that's 
straightforward. When a user builds an individual module, is 
there a sensible path relative to PYTHONHOME I can use?

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Comment By: Martin v. Löwis (loewis)
Date: 2003-10-31 05:05

Message:
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user_id=21627

Please do provide patches. Take into account that modules
may be built either with distutils, or through Modules/Setup.

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