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pythoncshared-librarieswrapperswig
Maximilian
Maximilian

Reputation: 1375

How can I wrap a C-Library in SWIG, which has usually to be linked during C-compilation?

Given a C-library, which has to be linked during compilation if I want to use its functions. I want to access these functions in Python using SWIG. I can only find examples and introductions where C-Code (example.c) is wrapped using SWIG, no method how to wrap a dynamic library (example.so).

Upvotes: 0

Views: 390

Answers (1)

Flexo - Save the data dump
Flexo - Save the data dump

Reputation: 88711

All you need to do to make the .so (or .a) library case work is to link the library appropriately when you do the compile step of the example build process. You will still have to compile the example_wrap.c that gets generated, this is where you can link against things.

So modified from the SWIG docs that would be:

$ swig -python example.i
$ gcc -O2 -fPIC -c example.c
$ gcc -O2 -fPIC -c example_wrap.c -I/usr/local/include/python2.5
$ gcc -shared example_wrap.o -o _example.so -lmylib.so

In reality you can also skip this at the compile time linker step and use dlopen at runtime instead by injecting some extra code into the Python part of your module that calls dlopen before the shared object from SWIG gets loaded.

Upvotes: 2

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