[ python-Bugs-840065 ] Incorrect shared library build

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Tue Nov 11 17:38:34 EST 2003

Bugs item #840065, was opened at 2003-11-11 08:29
Message generated for change (Comment added) made by jrevans
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Category: Build
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: James Evans (jrevans)
Assigned to: Nobody/Anonymous (nobody)
Summary: Incorrect shared library build

Initial Comment:
The shared library is built and linked incorrectly resulting 
in errors.

The proper method for linking a shared library is to link it 
against all libraries it is dependant upon.  This puts 
entries into a shared library's dependency table (which 
can be seen using 'ldd' on linux or 'objdump' on other 

The result of this is that any application that is linked 
againg a particular library does not need to be aware of 
any of its dependencies at link time, it merely links 
against what it is directly dependant upon.  This can be 
thought of as building a dependancy tree.

Getting a full list of all libraries an executable (or shared 
library) are dependant upon is as simple as using 'ldd' as 
this will list the full dependancy tree.

The problem with the python shared library is that it is 
not linked during your build process against any of the 
libraries it is dependant upon.  For example when 
building with the tk, readline, and expat modules 
compiled into python, the library needs to be linked 
against the respective libraries.

In this way the shared library resolves all of its own 

This is something that I have been doing for several 
years, including always having rebuilding the python 
library as a shread library by hand.  For example:
> ar -x libpythonX.X.a
> g++ -shared *.o -o libpythonX.X.so -L/path/to/libs -
lexpat -lreadline -ltk

however since you have introduced the configure flag 
for shared library support (finally) it would be nice to be 
able to use it.


>Comment By: James Evans (jrevans)
Date: 2003-11-11 14:38

Logged In: YES 

Okay,  I'll take a crack at it.


Comment By: Martin v. Löwis (loewis)
Date: 2003-11-11 12:14

Logged In: YES 

Would you be willing to contribute a patch? This feature is
essentially unmaintained, and only updated when users
contribute updates.


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