opencv/cmake/OpenCVDetectPython.cmake

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CMake
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if(WIN32 AND NOT PYTHON_EXECUTABLE)
# search for executable with the same bitness as resulting binaries
# standard FindPythonInterp always prefers executable from system path
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# this is really important because we are using the interpreter for numpy search and for choosing the install location
foreach(_CURRENT_VERSION ${Python_ADDITIONAL_VERSIONS} 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0)
find_host_program(PYTHON_EXECUTABLE
NAMES python${_CURRENT_VERSION} python
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PATHS
[HKEY_LOCAL_MACHINE\\\\SOFTWARE\\\\Python\\\\PythonCore\\\\${_CURRENT_VERSION}\\\\InstallPath]
[HKEY_CURRENT_USER\\\\SOFTWARE\\\\Python\\\\PythonCore\\\\${_CURRENT_VERSION}\\\\InstallPath]
NO_SYSTEM_ENVIRONMENT_PATH
)
endforeach()
endif()
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find_host_package(PythonInterp 2.0)
unset(PYTHON_USE_NUMPY CACHE)
unset(HAVE_SPHINX CACHE)
if(PYTHON_EXECUTABLE)
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if(PYTHON_VERSION_STRING)
set(PYTHON_VERSION_MAJOR_MINOR "${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}")
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set(PYTHON_VERSION_FULL "${PYTHON_VERSION_STRING}")
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else()
execute_process(COMMAND ${PYTHON_EXECUTABLE} --version
ERROR_VARIABLE PYTHON_VERSION_FULL
ERROR_STRIP_TRAILING_WHITESPACE)
string(REGEX MATCH "[0-9]+.[0-9]+" PYTHON_VERSION_MAJOR_MINOR "${PYTHON_VERSION_FULL}")
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endif()
if("${PYTHON_VERSION_FULL}" MATCHES "[0-9]+.[0-9]+.[0-9]+")
set(PYTHON_VERSION_FULL "${CMAKE_MATCH_0}")
elseif("${PYTHON_VERSION_FULL}" MATCHES "[0-9]+.[0-9]+")
set(PYTHON_VERSION_FULL "${CMAKE_MATCH_0}")
else()
unset(PYTHON_VERSION_FULL)
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endif()
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if(NOT ANDROID AND NOT IOS)
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if(CMAKE_VERSION VERSION_GREATER 2.8.8 AND PYTHON_VERSION_FULL)
find_host_package(PythonLibs ${PYTHON_VERSION_FULL} EXACT)
else()
find_host_package(PythonLibs ${PYTHON_VERSION_FULL})
endif()
# cmake 2.4 (at least on Ubuntu 8.04 (hardy)) don't define PYTHONLIBS_FOUND
if(NOT PYTHONLIBS_FOUND AND PYTHON_INCLUDE_PATH)
set(PYTHONLIBS_FOUND ON)
endif()
endif()
if(NOT ANDROID AND NOT IOS)
if(CMAKE_HOST_UNIX)
execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "from distutils.sysconfig import *; print get_python_lib()"
RESULT_VARIABLE PYTHON_CVPY_PROCESS
OUTPUT_VARIABLE PYTHON_STD_PACKAGES_PATH
OUTPUT_STRIP_TRAILING_WHITESPACE)
if("${PYTHON_STD_PACKAGES_PATH}" MATCHES "site-packages")
set(_PYTHON_PACKAGES_PATH "python${PYTHON_VERSION_MAJOR_MINOR}/site-packages")
else() #debian based assumed, install to the dist-packages.
set(_PYTHON_PACKAGES_PATH "python${PYTHON_VERSION_MAJOR_MINOR}/dist-packages")
endif()
if(EXISTS "${CMAKE_INSTALL_PREFIX}/lib${LIB_SUFFIX}/${PYTHON_PACKAGES_PATH}")
set(_PYTHON_PACKAGES_PATH "lib${LIB_SUFFIX}/${_PYTHON_PACKAGES_PATH}")
else()
set(_PYTHON_PACKAGES_PATH "lib/${_PYTHON_PACKAGES_PATH}")
endif()
elseif(CMAKE_HOST_WIN32)
get_filename_component(PYTHON_PATH "${PYTHON_EXECUTABLE}" PATH)
file(TO_CMAKE_PATH "${PYTHON_PATH}" PYTHON_PATH)
if(NOT EXISTS "${PYTHON_PATH}/Lib/site-packages")
unset(PYTHON_PATH)
get_filename_component(PYTHON_PATH "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${PYTHON_VERSION_MAJOR_MINOR}\\InstallPath]" ABSOLUTE)
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if(NOT PYTHON_PATH)
get_filename_component(PYTHON_PATH "[HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${PYTHON_VERSION_MAJOR_MINOR}\\InstallPath]" ABSOLUTE)
endif()
file(TO_CMAKE_PATH "${PYTHON_PATH}" PYTHON_PATH)
endif()
set(_PYTHON_PACKAGES_PATH "${PYTHON_PATH}/Lib/site-packages")
endif()
SET(PYTHON_PACKAGES_PATH "${_PYTHON_PACKAGES_PATH}" CACHE PATH "Where to install the python packages.")
if(NOT PYTHON_NUMPY_INCLUDE_DIR)
# Attempt to discover the NumPy include directory. If this succeeds, then build python API with NumPy
execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "import os; os.environ['DISTUTILS_USE_SDK']='1'; import numpy.distutils; print numpy.distutils.misc_util.get_numpy_include_dirs()[0]"
RESULT_VARIABLE PYTHON_NUMPY_PROCESS
OUTPUT_VARIABLE PYTHON_NUMPY_INCLUDE_DIR
OUTPUT_STRIP_TRAILING_WHITESPACE)
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if(PYTHON_NUMPY_PROCESS EQUAL 0)
file(TO_CMAKE_PATH "${PYTHON_NUMPY_INCLUDE_DIR}" _PYTHON_NUMPY_INCLUDE_DIR)
set(PYTHON_NUMPY_INCLUDE_DIR ${_PYTHON_NUMPY_INCLUDE_DIR} CACHE PATH "Path to numpy headers")
endif()
endif()
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if(PYTHON_NUMPY_INCLUDE_DIR)
set(PYTHON_USE_NUMPY TRUE)
execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "import numpy; print numpy.version.version"
RESULT_VARIABLE PYTHON_NUMPY_PROCESS
OUTPUT_VARIABLE PYTHON_NUMPY_VERSION
OUTPUT_STRIP_TRAILING_WHITESPACE)
endif()
endif(NOT ANDROID AND NOT IOS)
if(BUILD_DOCS)
find_host_program(SPHINX_BUILD sphinx-build)
if(SPHINX_BUILD)
if(UNIX)
execute_process(COMMAND sh -c "${SPHINX_BUILD} -_ 2>&1 | sed -ne 1p"
RESULT_VARIABLE SPHINX_PROCESS
OUTPUT_VARIABLE SPHINX_VERSION
OUTPUT_STRIP_TRAILING_WHITESPACE)
else()
execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "import sphinx; print sphinx.__version__"
RESULT_VARIABLE SPHINX_PROCESS
OUTPUT_VARIABLE SPHINX_VERSION
OUTPUT_STRIP_TRAILING_WHITESPACE)
endif()
if(SPHINX_PROCESS EQUAL 0)
set(HAVE_SPHINX 1)
message(STATUS "Found Sphinx ${SPHINX_VERSION}: ${SPHINX_BUILD}")
endif()
endif()
endif(BUILD_DOCS)
endif(PYTHON_EXECUTABLE)