I have downloaded and built Boost 1.64 on Windows by using the following
command:
b2 --build-type=complete address-model=64 toolset=msvc stage
I added a user-config.jam file in my home directory to tell Boost where to find
Python 3:
using python : 3.6 : c:\\anaconda3\\python ;
I am then trying to compile a small test project using boost::python and
boost::numpy:
#include <boost/python.hpp>
#include <boost/python/numpy.hpp>
namespace bp = boost::python;
namespace np = boost::python::numpy;
np::ndarray test_make_zeros(int rows, int cols)
{
return np::zeros(bp::make_tuple(rows, cols),
np::dtype::get_builtin<float>());
}
BOOST_PYTHON_MODULE(test_boost_python)
{
np::initialize();
bp::def("test_make_zeros", test_make_zeros);
}
I am using the following CMakeLists.txt file:
cmake_minimum_required(VERSION 3.8)
project(test_boost_python)
set(BOOST_ROOT "C:/Boost-1.64")
set(Boost_ADDITIONAL_VERSIONS 1.64)
find_package(PythonLibs 3.6 REQUIRED)
include_directories(${PYTHON_INCLUDE_DIRS})
find_package(Boost REQUIRED COMPONENTS python3 numpy3)
include_directories(${Boost_INCLUDE_DIRS})
link_directories(${Boost_LIBRARY_DIRS})
add_library(test_boost_python SHARED test_boost_python.cpp)
set_target_properties(test_boost_python PROPERTIES PREFIX "" SUFFIX
".pyd")
set_target_properties(test_boost_python PROPERTIES DEFINE_SYMBOL
"BOOST_ALL_NO_LIB")
target_link_libraries(test_boost_python ${PYTHON_LIBRARIES}
${Boost_LIBRARIES})
My boost::python library is given the name boost_python3-vc140-mt-1_64.lib and
boost::numpy ends up as boost_numpy3-vc140-mt-1_64.lib when linking against
Python 3.6.
I had to turn on BOOST_ALL_NO_LIB. If not, the compiler looks for
boost_python-vc140-mt-1_64.lib boost_numpy-vc140-mt-1_64.lib (which is under
the wrong name, with a missing number 3 after the library names - Is this a bug
on Windows?)
For my test project, I now get the following linking error:
test_boost_python.obj : error LNK2019: unresolved external symbol
"class boost::python::numpy::dtype __cdecl
boost::python::numpy::detail::get_float_dtype<32>(void)"
(??$get_float_dtype@$0CA@@detail@numpy@python@boost@@YA?AVdtype@123@XZ)
referenced in function "public: static class boost::python::numpy::dtype
__cdecl boost::python::numpy::detail::builtin_dtype<float,0>::get(void)"
(?get@?$builtin_dtype@M$0A@@detail@numpy@python@boost@@SA?AVdtype@345@XZ)
What may be the reason for this missing symbol and how should I go about to fix
it?
-Øystein
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