cmake link with libboost_python-py32.so instead of libboost_python.so

Question

I'm trying to build python bindings for a library that i wrote, and i'm having some trouble getting cmake to understand that it should use the boost-python library for python 3.

Here is my cmake file:

cmake_minimum_required(VERSION 2.8)

FIND_PACKAGE(Boost COMPONENTS
                system
                thread
                python REQUIRED)
find_package(PythonLibs REQUIRED)

INCLUDE_DIRECTORIES(${PYTHON_LIBRARIES})
INCLUDE_DIRECTORIES(${PYTHON_INCLUDE_DIRS})
INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIRS})

ADD_LIBRARY(
  pschulze SHARED
  src/candidate_relation.cpp
  src/schulze.cpp
  src/calculate.cpp
  src/candidate.cpp
  src/ranking.cpp
  src/userinput.cpp
  python.cpp)

TARGET_LINK_LIBRARIES(pschulze ${Boost_LIBRARIES} ${PYTHON_LIBRARIES})

ADD_EXECUTABLE(
  schulze
  src/candidate_relation.cpp
  src/schulze.cpp
  src/calculate.cpp
  src/candidate.cpp
  src/ranking.cpp
  src/userinput.cpp
  src/json-spirit/json_spirit_reader.cpp
  src/json-spirit/json_spirit_value.cpp
  main.cpp)

TARGET_LINK_LIBRARIES(schulze ${Boost_LIBRARIES} ${PYTHON_LIBRARIES})

ADD_DEFINITIONS(-std=gnu++0x -Os)

add_subdirectory (tests)

set(CMAKE_BUILD_TYPE Debug)

And this is the linker error that I get:

Linking CXX executable schulze
CMakeFiles/schulze.dir/src/schulze.cpp.o: In function `arg_to_python':
/usr/include/boost/python/converter/builtin_converters.hpp:122: undefined reference to `PyInt_FromLong'
/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../lib/libboost_python.so: undefined reference to `PyString_Size'

Does changing to find_package(PythonLibs 3 REQUIRED) work? You should probably delete your CMakeCache.txt before trying. — Fraser
– Fraser, Commented Mar 3, 2013 at 18:38
the builtin_converters.hpp:122 error disappeared, but the libboost_python.so: undefined reference to `PyString_Size' is still there. — Alexander Kjäll
– Alexander Kjäll, Commented Mar 3, 2013 at 18:59
@Fraser: find_package(PythonLibs 3 REQUIRED) won't help you to find the corresponding Boost.Python library. It finds the Python "basic" language libraries only. — András Aszódi
– András Aszódi, Commented Oct 7, 2016 at 14:13

Julien Hirel · Accepted Answer · 2013-03-27 13:56:05Z

6

This might do the trick :

set(Python_ADDITIONAL_VERSIONS 3.2)

find_package(Boost COMPONENTS system thread python-py32 REQUIRED)

answered Mar 27, 2013 at 13:56

Julien Hirel

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2 Comments

András Aszódi Over a year ago

This may work e.g. on Ubuntu. But if you compile Boost from sources on the Mac, the library is called simply libboost_python3. May happen on other Linux distributions (e.g. Fedora) as well.

blanche Over a year ago

@user465139 where would you set that?

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