Undefined boost python symbol: boost::python::detail::init_module

Question

I get an undefined symbol error when trying to import an extension compiled with boost python, and the symbol is one that should be included in the boost library.

I

Answer 1

The undefined symbol is

boost::python::detail::init_module(char const*, void (*)())

not

boost::python::detail::init_module(PyModuleDef&, void (*)())

on http://www.boost.org/doc/libs/1_46_1/boost/python/module_init.hpp I see that the method signature has changed to the latter one in Python 3.

You should make sure that PY_VERSION_HEX is set correctly when the boost python headers are processed.

On my system, I see that this is e.g. defined in /usr/include/python3.1/patchlevel.h (but I had to install the python 3.1 development package first)