在 OS X 上使用带有 CMake 的 Boost Python

Question

我正在 OS X 上尝试这个 boost python with cmake 示例。post 有点旧，但我找不到更新的东西。我的目标是使用 CMake（因为我使用的是 CLion）来构建 C++ 和 Python 库的集成项目。我在 OS X

上使用 Python 2.7

我的 .cpp 文件是

#include <boost/python.hpp>

char const* yay()
{
  return "Yay!";
}

BOOST_PYTHON_MODULE(libyay)
{
  using namespace boost::python;
  def("yay", yay);
}

我的CMakesLists.txt

CMAKE_MINIMUM_REQUIRED(VERSION 3.3)
IF(NOT CMAKE_BUILD_TYPE)
  SET(CMAKE_BUILD_TYPE "DEBUG")
  #SET(CMAKE_BUILD_TYPE "RELEASE")
  #SET(CMAKE_BUILD_TYPE "RELWITHDEBINFO")
  #SET(CMAKE_BUILD_TYPE "MINSIZEREL")
ENDIF()

FIND_PACKAGE(PythonLibs 2.7 REQUIRED)

FIND_PACKAGE(Boost)
IF(Boost_FOUND)
  INCLUDE_DIRECTORIES("${Boost_INCLUDE_DIRS}" "/usr/include/python2.7")
  SET(Boost_USE_STATIC_LIBS OFF)
  SET(Boost_USE_MULTITHREADED ON)
  SET(Boost_USE_STATIC_RUNTIME OFF)
  FIND_PACKAGE(Boost COMPONENTS python)

  ADD_LIBRARY(yay SHARED yay.cpp)
  TARGET_LINK_LIBRARIES(yay ${Boost_LIBRARIES} ${PYTHON_LIBRARIES})
ELSEIF(NOT Boost_FOUND)
  MESSAGE(FATAL_ERROR "Unable to find correct Boost version. Did you set BOOST_ROOT?")
ENDIF()


IF(CMAKE_COMPILER_IS_GNUCXX)
  ADD_DEFINITIONS("-Wall")
ELSE()
  SET(CMAKE_CXX_FLAGS "-Wall")
  MESSAGE("You have compiler " ${CMAKE_CXX_COMPILER_ID})
  #MESSAGE(FATAL_ERROR "CMakeLists.txt has not been tested/written for your compiler.")
  MESSAGE("CMakeLists.txt has not been tested/written for your compiler.")
ENDIF()

最后，我打开 Python 控制台并尝试此操作

from ctypes import *
ly = cdll.LoadLibrary("libyay.dylib")
print ly.yay()

产生此错误：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/Cellar/python/2.7.12_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ctypes/__init__.py", line 375, in __getattr__
    func = self.__getitem__(name)
  File "/usr/local/Cellar/python/2.7.12_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ctypes/__init__.py", line 380, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: dlsym(0x7fdb5344aec0, yay): symbol not found

我希望得到以下方面的指导：(a) 集成 C++ 和 Python 的整个方法是否过时，(b) 这个错误应该告诉我什么，以及 (c) 使用 CMake 的其他方法。

Answer 1

关键似乎是我的 Python 版本无法加载 make 生成的 .dylib 文件。我不知道为什么，所以我在 CMakeLists.txt 文件中使用了这个技巧并包含了 if(APPLE) 命令

cmake_minimum_required( VERSION 3.3 )
project( BoostPythonHelloWorld )

# Make a .so output!
if(APPLE)
set(CMAKE_SHARED_LIBRARY_SUFFIX ".so")
endif(APPLE)

# Find necessary packages
find_package( PythonLibs 2.7 REQUIRED )
include_directories( ${PYTHON_INCLUDE_DIRS} )

find_package( Boost COMPONENTS python REQUIRED )
include_directories( ${Boost_INCLUDE_DIR} )

# Build our library
add_library( greet SHARED greet.cpp )

# Define the wrapper library that wraps our library
add_library( greet_ext SHARED greet_ext.cpp )
target_link_libraries( greet_ext ${Boost_LIBRARIES} ${PYTHON_LIBRARIES} greet )
# don't prepend wrapper library name with lib
set_target_properties( greet_ext PROPERTIES PREFIX "" )

完成 cmake 和 make 后，我能够打开 Python shell 和运行

import greet_ext
greet_ext.greet()

我已经在 github. Also I was to thank Feral Chicken for a a useful post

上发布了一个完整的示例

在 OS X 上使用带有 CMake 的 Boost Python

Using Boost Python with CMake on OS X

c++

ctypes

cmake

boost-python

python-2.7