Python binding acceleration

Question

I am adding boost.python for my game. I write wrappers for my classes to use in scripts. The problem is with this library with my application. I am using cmake build system.

Now I have a simple application with 1 file and a makefile for it:

 PYTHON = /usr/include/python2.7 BOOST_INC = /usr/include BOOST_LIB = /usr/lib TARGET = main $(TARGET).so: $(TARGET).o g++ -shared -Wl,--export-dynamic \ $(TARGET).o -L$(BOOST_LIB) -lboost_python \ -L/usr/lib/python2.7/config -lpython2.7 \ -o $(TARGET).so $(TARGET).o: $(TARGET).cpp g++ -I$(PYTHON) -I$(BOOST_INC) -c -fPIC $(TARGET).cpp 

And it works. It creates a “so” file for me, which I can import from python.

Now the question is: how to do this for cmake?

I wrote in the main CMakeList.txt :

 ... find_package(Boost COMPONENTS filesystem system date_time python REQUIRED) message("Include dirs of boost: " ${Boost_INCLUDE_DIRS} ) message("Libs of boost: " ${Boost_LIBRARIES} ) include_directories( ${Boost_INCLUDE_DIRS} ... ) target_link_libraries(Themisto ${Boost_LIBRARIES} ... ) ... 

message shows:

 Include dirs of boost: /usr/include Libs of boost: /usr/lib/libboost_filesystem-mt.a/usr/lib/libboost_system-mt.a/usr/lib/libboost_date_time-mt.a/usr/lib/libboost_python-mt.a 

Ok, so I added a simple .cpp file for my project with the inclusion of <boost/python.hpp> . I get a compilation error:

 /usr/include/boost/python/detail/wrap_python.hpp:50:23: fatal error: pyconfig.h: No such file or directory 

Therefore, you do not need to include all directories.

And the second question:

How to organize two-stage building script-cpp files? In the makefile that I showed, there are TARGET.o and TARGET.so , how to handle these 2 commands in cmake?

As I understand it, the best way is to create a subproject and do something there.

Thanks.

Answer 1

You are missing the include and libs directory for python in your CMakeList.txt. Use the PythonFindLibs macro or the same find_package strategy you used for Boost

 find_package(Boost COMPONENTS filesystem system date_time python REQUIRED) message("Include dirs of boost: " ${Boost_INCLUDE_DIRS} ) message("Libs of boost: " ${Boost_LIBRARIES} ) find_package(PythonLibs REQUIRED) message("Include dirs of Python: " ${PYTHON_INCLUDE_DIRS} ) message("Libs of Python: " ${PYTHON_LIBRARIES} ) include_directories( ${Boost_INCLUDE_DIRS} ${PYTHON_INCLUDE_DIRS} # <------- ... ) target_link_libraries(Themisto ${Boost_LIBRARIES} ${PYTHON_LIBRARIES} # <------ ... ) ...