cmake/OpenCVDetectPython.cmake

   1 # Find specified Python version
   2 # Arguments:
   3 #   preferred_version (value): Version to check for first
   4 #   min_version (value): Minimum supported version
   5 #   library_env (value): Name of Python library ENV variable to check
   6 #   include_dir_env (value): Name of Python include directory ENV variable to check
   7 #   found (variable): Set if interpreter found
   8 #   executable (variable): Output of executable found
   9 #   version_string (variable): Output of found version
  10 #   version_major (variable): Output of found major version
  11 #   version_minor (variable): Output of found minor version
  12 #   libs_found (variable): Set if libs found
  13 #   libs_version_string (variable): Output of found libs version
  14 #   libraries (variable): Output of found Python libraries
  15 #   library (variable): Output of found Python library
  16 #   debug_libraries (variable): Output of found Python debug libraries
  17 #   debug_library (variable): Output of found Python debug library
  18 #   include_path (variable): Output of found Python include path
  19 #   include_dir (variable): Output of found Python include dir
  20 #   include_dir2 (variable): Output of found Python include dir2
  21 #   packages_path (variable): Output of found Python packages path
  22 #   numpy_include_dirs (variable): Output of found Python Numpy include dirs
  23 #   numpy_version (variable): Output of found Python Numpy version
  24 function(find_python preferred_version min_version library_env include_dir_env
  25          found executable version_string version_major version_minor
  26          libs_found libs_version_string libraries library debug_libraries
  27          debug_library include_path include_dir include_dir2 packages_path
  28          numpy_include_dirs numpy_version)
  29
  30   ocv_check_environment_variables(${executable})
  31   if(${executable})
  32     set(PYTHON_EXECUTABLE "${${executable}}")
  33   endif()
  34
  35   if(WIN32 AND NOT ${executable})
  36     # search for executable with the same bitness as resulting binaries
  37     # standard FindPythonInterp always prefers executable from system path
  38     # this is really important because we are using the interpreter for numpy search and for choosing the install location
  39     foreach(_CURRENT_VERSION ${Python_ADDITIONAL_VERSIONS} "${preferred_version}" "${min_version}")
  40       find_host_program(executable
  41         NAMES python${_CURRENT_VERSION} python
  42         PATHS
  43           [HKEY_LOCAL_MACHINE\\\\SOFTWARE\\\\Python\\\\PythonCore\\\\${_CURRENT_VERSION}\\\\InstallPath]
  44           [HKEY_CURRENT_USER\\\\SOFTWARE\\\\Python\\\\PythonCore\\\\${_CURRENT_VERSION}\\\\InstallPath]
  45         NO_SYSTEM_ENVIRONMENT_PATH
  46       )
  47     endforeach()
  48   endif()
  49
  50   find_host_package(PythonInterp "${preferred_version}")
  51   if(NOT PYTHONINTERP_FOUND)
  52     find_host_package(PythonInterp "${min_version}")
  53   endif()
  54
  55   if(PYTHONINTERP_FOUND)
  56     # Copy outputs
  57     set(_found ${PYTHONINTERP_FOUND})
  58     set(_executable ${PYTHON_EXECUTABLE})
  59     set(_version_string ${PYTHON_VERSION_STRING})
  60     set(_version_major ${PYTHON_VERSION_MAJOR})
  61     set(_version_minor ${PYTHON_VERSION_MINOR})
  62     set(_version_patch ${PYTHON_VERSION_PATCH})
  63
  64     # Clear find_host_package side effects
  65     unset(PYTHONINTERP_FOUND)
  66     unset(PYTHON_EXECUTABLE CACHE)
  67     unset(PYTHON_VERSION_STRING)
  68     unset(PYTHON_VERSION_MAJOR)
  69     unset(PYTHON_VERSION_MINOR)
  70     unset(PYTHON_VERSION_PATCH)
  71   endif()
  72
  73   if(_found)
  74     set(_version_major_minor "${_version_major}.${_version_minor}")
  75
  76     if(NOT ANDROID AND NOT IOS)
  77       ocv_check_environment_variables(${library_env} ${include_dir_env})
  78       if(${library})
  79           set(PYTHON_LIBRARY "${${library_env}}")
  80       endif()
  81       if(${include_dir})
  82           set(PYTHON_INCLUDE_DIR "${${include_dir_env}}")
  83       endif()
  84
  85       # not using _version_string here, because it might not conform to the CMake version format
  86       find_host_package(PythonLibs "${_version_major_minor}.${_version_patch}" EXACT)
  87
  88       if(PYTHONLIBS_FOUND)
  89         # Copy outputs
  90         set(_libs_found ${PYTHONLIBS_FOUND})
  91         set(_libraries ${PYTHON_LIBRARIES})
  92         set(_include_path ${PYTHON_INCLUDE_PATH})
  93         set(_include_dirs ${PYTHON_INCLUDE_DIRS})
  94         set(_debug_libraries ${PYTHON_DEBUG_LIBRARIES})
  95         set(_libs_version_string ${PYTHONLIBS_VERSION_STRING})
  96         set(_debug_library ${PYTHON_DEBUG_LIBRARY})
  97         set(_library ${PYTHON_LIBRARY})
  98         set(_library_debug ${PYTHON_LIBRARY_DEBUG})
  99         set(_library_release ${PYTHON_LIBRARY_RELEASE})
 100         set(_include_dir ${PYTHON_INCLUDE_DIR})
 101         set(_include_dir2 ${PYTHON_INCLUDE_DIR2})
 102
 103         # Clear find_host_package side effects
 104         unset(PYTHONLIBS_FOUND)
 105         unset(PYTHON_LIBRARIES)
 106         unset(PYTHON_INCLUDE_PATH)
 107         unset(PYTHON_INCLUDE_DIRS)
 108         unset(PYTHON_DEBUG_LIBRARIES)
 109         unset(PYTHONLIBS_VERSION_STRING)
 110         unset(PYTHON_DEBUG_LIBRARY CACHE)
 111         unset(PYTHON_LIBRARY)
 112         unset(PYTHON_LIBRARY_DEBUG)
 113         unset(PYTHON_LIBRARY_RELEASE)
 114         unset(PYTHON_LIBRARY CACHE)
 115         unset(PYTHON_LIBRARY_DEBUG CACHE)
 116         unset(PYTHON_LIBRARY_RELEASE CACHE)
 117         unset(PYTHON_INCLUDE_DIR CACHE)
 118         unset(PYTHON_INCLUDE_DIR2 CACHE)
 119       endif()
 120     endif()
 121
 122     if(NOT ANDROID AND NOT IOS)
 123       if(CMAKE_HOST_UNIX)
 124         execute_process(COMMAND ${_executable} -c "from distutils.sysconfig import *; print(get_python_lib())"
 125                         RESULT_VARIABLE _cvpy_process
 126                         OUTPUT_VARIABLE _std_packages_path
 127                         OUTPUT_STRIP_TRAILING_WHITESPACE)
 128         if("${_std_packages_path}" MATCHES "site-packages")
 129           set(_packages_path "python${_version_major_minor}/site-packages")
 130         else() #debian based assumed, install to the dist-packages.
 131           set(_packages_path "python${_version_major_minor}/dist-packages")
 132         endif()
 133         if(EXISTS "${CMAKE_INSTALL_PREFIX}/lib${LIB_SUFFIX}/${${packages_path}}")
 134           set(_packages_path "lib${LIB_SUFFIX}/${_packages_path}")
 135         else()
 136           set(_packages_path "lib/${_packages_path}")
 137         endif()
 138       elseif(CMAKE_HOST_WIN32)
 139         get_filename_component(_path "${_executable}" PATH)
 140         file(TO_CMAKE_PATH "${_path}" _path)
 141         if(NOT EXISTS "${_path}/Lib/site-packages")
 142           unset(_path)
 143           get_filename_component(_path "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_version_major_minor}\\InstallPath]" ABSOLUTE)
 144           if(NOT _path)
 145              get_filename_component(_path "[HKEY_CURRENT_USER\\SOFTWARE\\Python\\PythonCore\\${_version_major_minor}\\InstallPath]" ABSOLUTE)
 146           endif()
 147           file(TO_CMAKE_PATH "${_path}" _path)
 148         endif()
 149         set(_packages_path "${_path}/Lib/site-packages")
 150         unset(_path)
 151       endif()
 152
 153       set(_numpy_include_dirs ${${numpy_include_dirs}})
 154
 155       if(NOT _numpy_include_dirs)
 156         if(CMAKE_CROSSCOMPILING)
 157           message(STATUS "Cannot probe for Python/Numpy support (because we are cross-compiling OpenCV)")
 158           message(STATUS "If you want to enable Python/Numpy support, set the following variables:")
 159           message(STATUS "  PYTHON2_INCLUDE_PATH")
 160           message(STATUS "  PYTHON2_LIBRARIES")
 161           message(STATUS "  PYTHON2_NUMPY_INCLUDE_DIRS")
 162           message(STATUS "  PYTHON3_INCLUDE_PATH")
 163           message(STATUS "  PYTHON3_LIBRARIES")
 164           message(STATUS "  PYTHON3_NUMPY_INCLUDE_DIRS")
 165         else()
 166           # Attempt to discover the NumPy include directory. If this succeeds, then build python API with NumPy
 167           execute_process(COMMAND "${_executable}" -c "import os; os.environ['DISTUTILS_USE_SDK']='1'; import numpy.distutils; print(os.pathsep.join(numpy.distutils.misc_util.get_numpy_include_dirs()))"
 168                           RESULT_VARIABLE _numpy_process
 169                           OUTPUT_VARIABLE _numpy_include_dirs
 170                           OUTPUT_STRIP_TRAILING_WHITESPACE)
 171
 172           if(NOT _numpy_process EQUAL 0)
 173               unset(_numpy_include_dirs)
 174           endif()
 175         endif()
 176       endif()
 177
 178       if(_numpy_include_dirs)
 179         file(TO_CMAKE_PATH "${_numpy_include_dirs}" _numpy_include_dirs)
 180         if(CMAKE_CROSSCOMPILING)
 181           if(NOT _numpy_version)
 182             set(_numpy_version "undefined - cannot be probed because of the cross-compilation")
 183           endif()
 184         else()
 185           execute_process(COMMAND "${_executable}" -c "import numpy; print(numpy.version.version)"
 186                           RESULT_VARIABLE _numpy_process
 187                           OUTPUT_VARIABLE _numpy_version
 188                           OUTPUT_STRIP_TRAILING_WHITESPACE)
 189         endif()
 190       endif()
 191     endif(NOT ANDROID AND NOT IOS)
 192   endif()
 193
 194   # Export return values
 195   set(${found} "${_found}" PARENT_SCOPE)
 196   set(${executable} "${_executable}" CACHE FILEPATH "Path to Python interpretor")
 197   set(${version_string} "${_version_string}" PARENT_SCOPE)
 198   set(${version_major} "${_version_major}" PARENT_SCOPE)
 199   set(${version_minor} "${_version_minor}" PARENT_SCOPE)
 200   set(${libs_found} "${_libs_found}" PARENT_SCOPE)
 201   set(${libs_version_string} "${_libs_version_string}" PARENT_SCOPE)
 202   set(${libraries} "${_libraries}" PARENT_SCOPE)
 203   set(${library} "${_library}" CACHE FILEPATH "Path to Python library")
 204   set(${debug_libraries} "${_debug_libraries}" PARENT_SCOPE)
 205   set(${debug_library} "${_debug_library}" CACHE FILEPATH "Path to Python debug")
 206   set(${include_path} "${_include_path}" PARENT_SCOPE)
 207   set(${include_dir} "${_include_dir}" CACHE PATH "Python include dir")
 208   set(${include_dir2} "${_include_dir2}" CACHE PATH "Python include dir 2")
 209   set(${packages_path} "${_packages_path}" CACHE PATH "Where to install the python packages.")
 210   set(${numpy_include_dirs} ${_numpy_include_dirs} CACHE PATH "Path to numpy headers")
 211   set(${numpy_version} "${_numpy_version}" PARENT_SCOPE)
 212 endfunction(find_python)
 213
 214 find_python(2.7 "${MIN_VER_PYTHON2}" PYTHON2_LIBRARY PYTHON2_INCLUDE_DIR
 215     PYTHON2INTERP_FOUND PYTHON2_EXECUTABLE PYTHON2_VERSION_STRING
 216     PYTHON2_VERSION_MAJOR PYTHON2_VERSION_MINOR PYTHON2LIBS_FOUND
 217     PYTHON2LIBS_VERSION_STRING PYTHON2_LIBRARIES PYTHON2_LIBRARY
 218     PYTHON2_DEBUG_LIBRARIES PYTHON2_LIBRARY_DEBUG PYTHON2_INCLUDE_PATH
 219     PYTHON2_INCLUDE_DIR PYTHON2_INCLUDE_DIR2 PYTHON2_PACKAGES_PATH
 220     PYTHON2_NUMPY_INCLUDE_DIRS PYTHON2_NUMPY_VERSION)
 221
 222 find_python(3.4 "${MIN_VER_PYTHON3}" PYTHON3_LIBRARY PYTHON3_INCLUDE_DIR
 223     PYTHON3INTERP_FOUND PYTHON3_EXECUTABLE PYTHON3_VERSION_STRING
 224     PYTHON3_VERSION_MAJOR PYTHON3_VERSION_MINOR PYTHON3LIBS_FOUND
 225     PYTHON3LIBS_VERSION_STRING PYTHON3_LIBRARIES PYTHON3_LIBRARY
 226     PYTHON3_DEBUG_LIBRARIES PYTHON3_LIBRARY_DEBUG PYTHON3_INCLUDE_PATH
 227     PYTHON3_INCLUDE_DIR PYTHON3_INCLUDE_DIR2 PYTHON3_PACKAGES_PATH
 228     PYTHON3_NUMPY_INCLUDE_DIRS PYTHON3_NUMPY_VERSION)
 229
 230 # Use Python 2 as default Python interpreter
 231 if(PYTHON2LIBS_FOUND)
 232     set(PYTHON_DEFAULT_AVAILABLE "TRUE")
 233     set(PYTHON_DEFAULT_EXECUTABLE "${PYTHON2_EXECUTABLE}")
 234 endif()
 235
 236 unset(HAVE_SPHINX CACHE)
 237
 238 if(BUILD_DOCS)
 239   find_host_program(SPHINX_BUILD sphinx-build)
 240   find_host_program(PLANTUML plantuml)
 241   if(SPHINX_BUILD)
 242       execute_process(COMMAND "${SPHINX_BUILD}"
 243                       OUTPUT_QUIET
 244                       ERROR_VARIABLE SPHINX_OUTPUT
 245                       OUTPUT_STRIP_TRAILING_WHITESPACE)
 246       if(SPHINX_OUTPUT MATCHES "Sphinx v([0-9][^ \n]*)")
 247         set(SPHINX_VERSION "${CMAKE_MATCH_1}")
 248         set(HAVE_SPHINX 1)
 249         message(STATUS "Found Sphinx ${SPHINX_VERSION}: ${SPHINX_BUILD}")
 250       endif()
 251   endif()
 252 endif(BUILD_DOCS)