Modules/FindPythonInterp.cmake

   1 # - Find python interpreter
   2 # This module finds if Python interpreter is installed and determines where the
   3 # executables are. This code sets the following variables:
   4 #
   5 #  PYTHONINTERP_FOUND         - Was the Python executable found
   6 #  PYTHON_EXECUTABLE          - path to the Python interpreter
   7 #
   8 #  PYTHON_VERSION_STRING      - Python version found e.g. 2.5.2
   9 #  PYTHON_VERSION_MAJOR       - Python major version found e.g. 2
  10 #  PYTHON_VERSION_MINOR       - Python minor version found e.g. 5
  11 #  PYTHON_VERSION_PATCH       - Python patch version found e.g. 2
  12 #
  13 # The Python_ADDITIONAL_VERSIONS variable can be used to specify a list of
  14 # version numbers that should be taken into account when searching for Python.
  15 # You need to set this variable before calling find_package(PythonInterp).
  16
  17 #=============================================================================
  18 # Copyright 2005-2010 Kitware, Inc.
  19 # Copyright 2011 Bjoern Ricks <bjoern.ricks@gmail.com>
  20 # Copyright 2012 Rolf Eike Beer <eike@sf-mail.de>
  21 #
  22 # Distributed under the OSI-approved BSD License (the "License");
  23 # see accompanying file Copyright.txt for details.
  24 #
  25 # This software is distributed WITHOUT ANY WARRANTY; without even the
  26 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  27 # See the License for more information.
  28 #=============================================================================
  29 # (To distribute this file outside of CMake, substitute the full
  30 #  License text for the above reference.)
  31
  32 unset(_Python_NAMES)
  33
  34 set(_PYTHON1_VERSIONS 1.6 1.5)
  35 set(_PYTHON2_VERSIONS 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0)
  36 set(_PYTHON3_VERSIONS 3.3 3.2 3.1 3.0)
  37
  38 if(PythonInterp_FIND_VERSION)
  39     if(PythonInterp_FIND_VERSION MATCHES "^[0-9]+\\.[0-9]+(\\.[0-9]+.*)?$")
  40         string(REGEX REPLACE "^([0-9]+\\.[0-9]+).*" "\\1" _PYTHON_FIND_MAJ_MIN "${PythonInterp_FIND_VERSION}")
  41         string(REGEX REPLACE "^([0-9]+).*" "\\1" _PYTHON_FIND_MAJ "${_PYTHON_FIND_MAJ_MIN}")
  42         list(APPEND _Python_NAMES python${_PYTHON_FIND_MAJ_MIN} python${_PYTHON_FIND_MAJ})
  43         unset(_PYTHON_FIND_OTHER_VERSIONS)
  44         if(NOT PythonInterp_FIND_VERSION_EXACT)
  45             foreach(_PYTHON_V ${_PYTHON${_PYTHON_FIND_MAJ}_VERSIONS})
  46                 if(NOT _PYTHON_V VERSION_LESS _PYTHON_FIND_MAJ_MIN)
  47                     list(APPEND _PYTHON_FIND_OTHER_VERSIONS ${_PYTHON_V})
  48                 endif()
  49              endforeach()
  50         endif()
  51         unset(_PYTHON_FIND_MAJ_MIN)
  52         unset(_PYTHON_FIND_MAJ)
  53     else()
  54         list(APPEND _Python_NAMES python${PythonInterp_FIND_VERSION})
  55         set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON${PythonInterp_FIND_VERSION}_VERSIONS})
  56     endif()
  57 else()
  58     set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON3_VERSIONS} ${_PYTHON2_VERSIONS} ${_PYTHON1_VERSIONS})
  59 endif()
  60
  61 list(APPEND _Python_NAMES python)
  62
  63 # Search for the current active python version first
  64 find_program(PYTHON_EXECUTABLE NAMES ${_Python_NAMES})
  65
  66 # Set up the versions we know about, in the order we will search. Always add
  67 # the user supplied additional versions to the front.
  68 set(_Python_VERSIONS
  69   ${Python_ADDITIONAL_VERSIONS}
  70   ${_PYTHON_FIND_OTHER_VERSIONS}
  71   )
  72
  73 unset(_PYTHON_FIND_OTHER_VERSIONS)
  74 unset(_PYTHON1_VERSIONS)
  75 unset(_PYTHON2_VERSIONS)
  76 unset(_PYTHON3_VERSIONS)
  77
  78 # Search for newest python version if python executable isn't found
  79 if(NOT PYTHON_EXECUTABLE)
  80     foreach(_CURRENT_VERSION ${_Python_VERSIONS})
  81       set(_Python_NAMES python${_CURRENT_VERSION})
  82       if(WIN32)
  83         list(APPEND _Python_NAMES python)
  84       endif()
  85       find_program(PYTHON_EXECUTABLE
  86         NAMES ${_Python_NAMES}
  87         PATHS [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]
  88         )
  89     endforeach()
  90 endif()
  91
  92 # determine python version string
  93 if(PYTHON_EXECUTABLE)
  94     execute_process(COMMAND "${PYTHON_EXECUTABLE}" -c
  95                             "import sys; sys.stdout.write(';'.join([str(x) for x in sys.version_info[:3]]))"
  96                     OUTPUT_VARIABLE _VERSION
  97                     RESULT_VARIABLE _PYTHON_VERSION_RESULT
  98                     ERROR_QUIET)
  99     if(NOT _PYTHON_VERSION_RESULT)
 100         string(REPLACE ";" "." PYTHON_VERSION_STRING "${_VERSION}")
 101         list(GET _VERSION 0 PYTHON_VERSION_MAJOR)
 102         list(GET _VERSION 1 PYTHON_VERSION_MINOR)
 103         list(GET _VERSION 2 PYTHON_VERSION_PATCH)
 104         if(PYTHON_VERSION_PATCH EQUAL 0)
 105             # it's called "Python 2.7", not "2.7.0"
 106             string(REGEX REPLACE "\\.0$" "" PYTHON_VERSION_STRING "${PYTHON_VERSION_STRING}")
 107         endif()
 108     else()
 109         # sys.version predates sys.version_info, so use that
 110         execute_process(COMMAND "${PYTHON_EXECUTABLE}" -c "import sys; sys.stdout.write(sys.version)"
 111                         OUTPUT_VARIABLE _VERSION
 112                         RESULT_VARIABLE _PYTHON_VERSION_RESULT
 113                         ERROR_QUIET)
 114         if(NOT _PYTHON_VERSION_RESULT)
 115             string(REGEX REPLACE " .*" "" PYTHON_VERSION_STRING "${_VERSION}")
 116             string(REGEX REPLACE "^([0-9]+)\\.[0-9]+.*" "\\1" PYTHON_VERSION_MAJOR "${PYTHON_VERSION_STRING}")
 117             string(REGEX REPLACE "^[0-9]+\\.([0-9])+.*" "\\1" PYTHON_VERSION_MINOR "${PYTHON_VERSION_STRING}")
 118             if(PYTHON_VERSION_STRING MATCHES "^[0-9]+\\.[0-9]+\\.[0-9]+.*")
 119                 string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" PYTHON_VERSION_PATCH "${PYTHON_VERSION_STRING}")
 120             else()
 121                 set(PYTHON_VERSION_PATCH "0")
 122             endif()
 123         else()
 124             # sys.version was first documented for Python 1.5, so assume
 125             # this is older.
 126             set(PYTHON_VERSION_STRING "1.4")
 127             set(PYTHON_VERSION_MAJOR "1")
 128             set(PYTHON_VERSION_MAJOR "4")
 129             set(PYTHON_VERSION_MAJOR "0")
 130         endif()
 131     endif()
 132     unset(_PYTHON_VERSION_RESULT)
 133     unset(_VERSION)
 134 endif()
 135
 136 # handle the QUIETLY and REQUIRED arguments and set PYTHONINTERP_FOUND to TRUE if
 137 # all listed variables are TRUE
 138 include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
 139 FIND_PACKAGE_HANDLE_STANDARD_ARGS(PythonInterp REQUIRED_VARS PYTHON_EXECUTABLE VERSION_VAR PYTHON_VERSION_STRING)
 140
 141 mark_as_advanced(PYTHON_EXECUTABLE)