I have code written in C++:
#include <boost/python.hpp>
char const* greet()
{
return "Yay!";
}
BOOST_PYTHON_MODULE(libtest)
{
using namespace boost::python;
def("greet", greet);
}
Now i want to import this dynamic library to python by:
import libtest
But I get:
ImportError: /usr/lib/libboost_python.so.1.54.0: undefined symbol: PyClass_Type
What should I do? My OS is Arch Linux.
Ok, I have found solution for this problem. The simplest options is to compile by:
g++ testing.cpp -I/usr/include/python3.3m -I/usr/include/boost -lboost_python3 -lpython3.3m -o testing.so -shared -fPIC
Previously I used -lboost_python instead of -lboost_python3 ... But this solution is not cross platform so we can achieve this by cmake:
cmake_minimum_required(VERSION 2.6)
find_package(Boost 1.54 EXACT REQUIRED COMPONENTS python3)
INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIRS} "/usr/include/python3.3m/" )
find_package(PythonLibs)
ADD_LIBRARY(testing SHARED testing.cpp)
TARGET_LINK_LIBRARIES(testing ${Boost_LIBRARIES} ${PythonLibs_LIBRARIES})
Of course "/usr/include/python3.3m" won't be path to pythons include directory in all linux distros.
Use the same version of Python when building both Boost.Python and the libtest
module, as well as when importing libtest
.
PyClass_Type
is is part of the Python 2 C API and not part of the Python 3 C API. Hence, the Boost.Python library was likely built against Python 2. However, it is being loaded by a Python 3 interpreter, where the PyClass_Type
is not available.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With