RE: [Boost-Users] Linking an Archive

From: Tom Matelich (tmatelich_at_[hidden])
Date: 2002-02-27 14:08:44

The first getting_started1.so contains all the symbols from all of the
objects linked into it.

The second one only contains the symbols from getting_started.o and the
symbols from libboost_python.a which satisfy unsatified symbols of
getting_started1.o.  Linking shared library is like linking an executable,
it only takes the symbols from archives that it needs to satisfy itself.

The first question is why you want libboost_python.a.  If it is a valid
reason, then you need to find a way to get all the code you need out of it
into the shared lib.  The first would be to use ar to get all the objects
out, then take those and put them into the shared library.  The second would
be to keep adding unsatified symbols to getting_started.o until
getting_started1.so has everything it needs.

Tom

> -----Original Message-----
> From: doak87508 [mailto:jdoak_at_[hidden]]
> Sent: Wednesday, February 27, 2002 10:21 AM
> To: Boost-Users_at_[hidden]
> Subject: [Boost-Users] Linking an Archive
> 
> 
> I am playing around with using an archive to created a shared library
> (.so file) instead of linking all the individual objects. I have
> success when I link individual objects:
> 
> % g++ -shared classes.o conversions.o errors.o extension_class.o
> functions.o init_function.o module_builder.o objects.o types.o
> cross_module.o getting_started1.o -o getting_started1.so
> 
> % python
> 1;31mh[1] >>> import getting_started1
> 1;31mh[1] >>> getting_started1.greet()
> 'hello, world'
> 
> Now, I create an archive:
> 
> % ar r libboost_python.a classes.o conversions.o errors.o
> extension_class.o functions.o init_function.o module_builder.o
> objects.o types.o cross_module.o
> 
> Then, I link that archive into the shared library:
> 
> % g++ -shared libboost_python.a getting_started1.o -o
> getting_started1.so
> 
> % python
> 1;31mh[1] >>> import getting_started1.so
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> ImportError: ./getting_started1.so: undefined symbol:
> add__Q35boost6python19module_builder_basePQ45boost
> 6python6detail8functionPCc
> 
> I have also tried linking as follows with no change in result:
> 
> % g++ -shared -L. -lboost_python getting_started1.o -o
> getting_started1.so
> 
> Does someone know how to get linking working with an archive file?
> 
> JD
> 
> 
> 
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