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@lanl.gov] Sent: Wednesday, February 27, 2002 10:21 AM To: Boost-Users@yahoogroups.com 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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