CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

project(testfindcmake29849238)

if(NOT APPLE)
  find_package(PythonInterp REQUIRED)
  find_package(PythonLibs ${PYTHON_VERSION_STRING} EXACT REQUIRED)
  set(CUSTOM_PYTHON_EXECUTABLE ${PYTHON_EXECUTABLE})
else()
  message(STATUS "Trying custom approach for finding Python.")
  # Start off by figuring out which Python executable to use.
  find_program(CUSTOM_PYTHON_EXECUTABLE python)
  message(STATUS "Found Python program: ${CUSTOM_PYTHON_EXECUTABLE}")
  execute_process(COMMAND ${CUSTOM_PYTHON_EXECUTABLE} -c "import sys; print 'python' + sys.version[0:3]"
                  OUTPUT_VARIABLE PYTHON_LIBRARY_NAME OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "PYTHON_LIBRARY_NAME: " ${PYTHON_LIBRARY_NAME})
  # Now find the Python include directories.
  execute_process(COMMAND ${CUSTOM_PYTHON_EXECUTABLE} -c "from distutils.sysconfig import *; print get_python_inc()"
                  OUTPUT_VARIABLE PYTHON_INCLUDE_DIRS OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "PYTHON_INCLUDE_DIRS: " ${PYTHON_INCLUDE_DIRS})
  # Now find the Python libraries. We'll start by looking near the Python
  # executable. If that fails, then we'll look near the Python include
  # directories.
  execute_process(COMMAND ${CUSTOM_PYTHON_EXECUTABLE} -c "import sys; print sys.exec_prefix"
                  OUTPUT_VARIABLE PYTHON_PREFIX OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "PYTHON_PREFIX: " ${PYTHON_PREFIX})
  FIND_LIBRARY(PYTHON_LIBRARIES
               NAMES ${PYTHON_LIBRARY_NAME}
               HINTS "${PYTHON_PREFIX}"
               PATH_SUFFIXES "lib" "libs"
               NO_DEFAULT_PATH)
  message(STATUS "PYTHON_LIBRARIES: " ${PYTHON_LIBRARIES})
  # If that failed, perhaps because the user is in a virtualenv, search around
  # the Python include directories.
  if(NOT PYTHON_LIBRARIES)
    message(STATUS "Failed to find PYTHON_LIBRARIES near the Python executable, so now looking near the Python include directories.")
    FIND_LIBRARY(PYTHON_LIBRARIES
                 NAMES ${PYTHON_LIBRARY_NAME}
                 HINTS "${PYTHON_INCLUDE_DIRS}/../.."
                 PATH_SUFFIXES "lib" "libs"
                 NO_DEFAULT_PATH)
    message(STATUS "PYTHON_LIBRARIES: " ${PYTHON_LIBRARIES})
  endif()
  # If we found the Python libraries and the include directories, then continue
  # on. If not, then try find_package as a last resort, but it probably won't
  # work.
  if(PYTHON_LIBRARIES AND PYTHON_INCLUDE_DIRS)
    message(STATUS "The custom approach for finding Python succeeded.")
    SET(PYTHONLIBS_FOUND TRUE)
  else()
    message(WARNING "The custom approach for finding Python failed. Defaulting to find_package.")
    find_package(PythonInterp REQUIRED)
    find_package(PythonLibs ${PYTHON_VERSION_STRING} EXACT REQUIRED)
    set(CUSTOM_PYTHON_EXECUTABLE ${PYTHON_EXECUTABLE})
  endif()
endif()
message(STATUS "Using CUSTOM_PYTHON_EXECUTABLE: " ${CUSTOM_PYTHON_EXECUTABLE})
message(STATUS "Using PYTHON_LIBRARIES: " ${PYTHON_LIBRARIES})
message(STATUS "Using PYTHON_INCLUDE_DIRS: " ${PYTHON_INCLUDE_DIRS})