# Distributed under the OSI-approved BSD 3-Clause License. See accompanying # file Copyright.txt or https://cmake.org/licensing for details. #.rst: # FindPythonInterp # ---------------- # # Find python interpreter # # This module finds if Python interpreter is installed and determines # where the executables are. This code sets the following variables: # # :: # # PYTHONINTERP_FOUND - Was the Python executable found # PYTHON_EXECUTABLE - path to the Python interpreter # # # # :: # # PYTHON_VERSION_STRING - Python version found e.g. 2.5.2 # PYTHON_VERSION_MAJOR - Python major version found e.g. 2 # PYTHON_VERSION_MINOR - Python minor version found e.g. 5 # PYTHON_VERSION_PATCH - Python patch version found e.g. 2 # # # # The Python_ADDITIONAL_VERSIONS variable can be used to specify a list # of version numbers that should be taken into account when searching # for Python. You need to set this variable before calling # find_package(PythonInterp). # # If calling both ``find_package(PythonInterp)`` and # ``find_package(PythonLibs)``, call ``find_package(PythonInterp)`` first to # get the currently active Python version by default with a consistent version # of PYTHON_LIBRARIES. unset(_Python_NAMES) set(_PYTHON1_VERSIONS 1.6 1.5) set(_PYTHON2_VERSIONS 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0) set(_PYTHON3_VERSIONS 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0) if(PythonInterp_FIND_VERSION) if(PythonInterp_FIND_VERSION_COUNT GREATER 1) set(_PYTHON_FIND_MAJ_MIN "${PythonInterp_FIND_VERSION_MAJOR}.${PythonInterp_FIND_VERSION_MINOR}") list(APPEND _Python_NAMES python${_PYTHON_FIND_MAJ_MIN} python${PythonInterp_FIND_VERSION_MAJOR}) unset(_PYTHON_FIND_OTHER_VERSIONS) if(NOT PythonInterp_FIND_VERSION_EXACT) foreach(_PYTHON_V ${_PYTHON${PythonInterp_FIND_VERSION_MAJOR}_VERSIONS}) if(NOT _PYTHON_V VERSION_LESS _PYTHON_FIND_MAJ_MIN) list(APPEND _PYTHON_FIND_OTHER_VERSIONS ${_PYTHON_V}) endif() endforeach() endif() unset(_PYTHON_FIND_MAJ_MIN) else() list(APPEND _Python_NAMES python${PythonInterp_FIND_VERSION_MAJOR}) set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON${PythonInterp_FIND_VERSION_MAJOR}_VERSIONS}) endif() else() set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON3_VERSIONS} ${_PYTHON2_VERSIONS} ${_PYTHON1_VERSIONS}) endif() find_program(PYTHON_EXECUTABLE NAMES ${_Python_NAMES}) # Set up the versions we know about, in the order we will search. Always add # the user supplied additional versions to the front. set(_Python_VERSIONS ${Python_ADDITIONAL_VERSIONS}) # If FindPythonInterp has already found the major and minor version, # insert that version next to get consistent versions of the interpreter and # library. if(DEFINED PYTHONLIBS_VERSION_STRING) string(REPLACE "." ";" _PYTHONLIBS_VERSION "${PYTHONLIBS_VERSION_STRING}") list(GET _PYTHONLIBS_VERSION 0 _PYTHONLIBS_VERSION_MAJOR) list(GET _PYTHONLIBS_VERSION 1 _PYTHONLIBS_VERSION_MINOR) list(APPEND _Python_VERSIONS ${_PYTHONLIBS_VERSION_MAJOR}.${_PYTHONLIBS_VERSION_MINOR}) endif() # Search for the current active python version first list(APPEND _Python_VERSIONS ";") list(APPEND _Python_VERSIONS ${_PYTHON_FIND_OTHER_VERSIONS}) unset(_PYTHON_FIND_OTHER_VERSIONS) unset(_PYTHON1_VERSIONS) unset(_PYTHON2_VERSIONS) unset(_PYTHON3_VERSIONS) # Search for newest python version if python executable isn't found if(NOT PYTHON_EXECUTABLE) foreach(_CURRENT_VERSION IN LISTS _Python_VERSIONS) set(_Python_NAMES python${_CURRENT_VERSION}) if(CMAKE_HOST_WIN32) list(APPEND _Python_NAMES python) endif() find_program(PYTHON_EXECUTABLE NAMES ${_Python_NAMES} PATHS [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath] [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-32\\InstallPath] [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}-64\\InstallPath] ) endforeach() endif() # determine python version string if(PYTHON_EXECUTABLE) execute_process(COMMAND "${PYTHON_EXECUTABLE}" -c "import sys; sys.stdout.write(';'.join([str(x) for x in sys.version_info[:3]]))" OUTPUT_VARIABLE _VERSION RESULT_VARIABLE _PYTHON_VERSION_RESULT ERROR_QUIET) if(NOT _PYTHON_VERSION_RESULT) string(REPLACE ";" "." PYTHON_VERSION_STRING "${_VERSION}") list(GET _VERSION 0 PYTHON_VERSION_MAJOR) list(GET _VERSION 1 PYTHON_VERSION_MINOR) list(GET _VERSION 2 PYTHON_VERSION_PATCH) if(PYTHON_VERSION_PATCH EQUAL 0) # it's called "Python 2.7", not "2.7.0" string(REGEX REPLACE "\\.0$" "" PYTHON_VERSION_STRING "${PYTHON_VERSION_STRING}") endif() else() # sys.version predates sys.version_info, so use that execute_process(COMMAND "${PYTHON_EXECUTABLE}" -c "import sys; sys.stdout.write(sys.version)" OUTPUT_VARIABLE _VERSION RESULT_VARIABLE _PYTHON_VERSION_RESULT ERROR_QUIET) if(NOT _PYTHON_VERSION_RESULT) string(REGEX REPLACE " .*" "" PYTHON_VERSION_STRING "${_VERSION}") string(REGEX REPLACE "^([0-9]+)\\.[0-9]+.*" "\\1" PYTHON_VERSION_MAJOR "${PYTHON_VERSION_STRING}") string(REGEX REPLACE "^[0-9]+\\.([0-9])+.*" "\\1" PYTHON_VERSION_MINOR "${PYTHON_VERSION_STRING}") if(PYTHON_VERSION_STRING MATCHES "^[0-9]+\\.[0-9]+\\.([0-9]+)") set(PYTHON_VERSION_PATCH "${CMAKE_MATCH_1}") else() set(PYTHON_VERSION_PATCH "0") endif() else() # sys.version was first documented for Python 1.5, so assume # this is older. set(PYTHON_VERSION_STRING "1.4") set(PYTHON_VERSION_MAJOR "1") set(PYTHON_VERSION_MINOR "4") set(PYTHON_VERSION_PATCH "0") endif() endif() unset(_PYTHON_VERSION_RESULT) unset(_VERSION) endif() include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake) FIND_PACKAGE_HANDLE_STANDARD_ARGS(PythonInterp REQUIRED_VARS PYTHON_EXECUTABLE VERSION_VAR PYTHON_VERSION_STRING) mark_as_advanced(PYTHON_EXECUTABLE)