Boost python不断链接python27库

Question

Since days I am trying to get started with boost python on windows instead of my raspberry pi and I am facing issues with boost (or some of its dependencies) insisting on linking against python27.lib instead of python36.lib (I am using Python 3.6)

On my raspberry pi I was using the bundled python which happened to be 2.X and linked against boost_python. Now on windows I am linking against boost_python3. I checked all my include paths in CMake and they all point to the 3.6 python path. I even renamed all paths on my system that contain python (one standalone 2.7 and one in cygwin) in a different version (I renamed cygwin folder to cygwin2 and deleted the standalone python 2.7 folder). It still wants that library...

In my program I have one single #include related to python and that's a #include <boost/python.hpp> . I followed that include in visual studio and it leads me to the python.hpp in the boost directory that I have specified in CMake, so that resolution is working. Inside boost/python.hpp eventually you get to wrap_python.hpp which includes the python headers. I also followed these in Visual Studio and it leads me to the files in the Python 3.6 folder.

Adding a comment to that include (removing it) makes the program compile fine, so I did not accidentally add it in CMake as a library. It has to be some #pragma comment somewhere.

So to sum up:

• There is no #include <Python.h> in my code
• I only include boost/python.hpp once
• Uncommenting that include "fixes" it
• I am using python 3.6 everywhere
• I disabled auto linking for boost in CMake with add_definitions(... -DBOOST_ALL_NO_LIB -DBOOST_PYTHON_DEBUG)

My question(s):

• Who or what could be causing this? Does boost directly link the python libraries?
• Is there a possibility in Visual Studio to somehow highlight all the files/lines where the preprocessor encounters a #pragma so I can track it down (because I am pretty sure it somehow somewhere gets a 2.7 python I am not aware of...)

Answer 1

I just went through this Boost will check for PY_MAJOR_VERSION to determine which libs to link with. So in c++ > General > Additional Include Directories , add your python include path so boost can see that PY_MAJOR_VERSION == 3 . If it doesn't it will pull the 2.x libs in by default.