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FindPythonInterp.cmake
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##############################################################################
# @file FindPythonInterp.cmake
# @brief Find Python interpreter.
#
# @par Input variables:
# <table border="0">
# <tr>
# @tp @b Python_ADDITIONAL_VERSIONS @endtp
# <td>List of version numbers that should be taken into account when
# searching for Python.</td>
# </tr>
# </table>
#
# @par Output variables:
# <table border="0">
# <tr>
# @tp @b PYTHONINTERP_FOUND @endtp
# <td>Was the Python executable found.</td>
# </tr>
# <tr>
# @tp @b PYTHON_EXECUTABLE @endtp
# <td>Path to the Python interpreter.</td>
# </tr>
# <tr>
# @tp @b PYTHON_VERSION_STRING @endtp
# <td>Python version found e.g. 2.5.2.</td>
# </tr>
# <tr>
# @tp @b PYTHON_VERSION_MAJOR @endtp
# <td>Python major version found e.g. 2.</td>
# </tr>
# <tr>
# @tp @b PYTHON_VERSION_MINOR @endtp
# <td>Python minor version found e.g. 5.</td>
# </tr>
# <tr>
# @tp @b PYTHON_VERSION_PATCH @endtp
# <td>Python patch version found e.g. 2.</td>
# </tr>
# </table>
#
# @note This module has been copied from the Git repository of CMake on
# 4/12/2012, i.e., before the release of CMake 2.8.8. Once CMake 2.8.8
# or any version is available for all major platforms, consider to
# remove this module from the BASIS package.
#
# @ingroup CMakeFindModules
##############################################################################
#=============================================================================
# Copyright 2005-2010 Kitware, Inc.
# Copyright 2011 Bjoern Ricks <[email protected]>
# Copyright 2012 Rolf Eike Beer <[email protected]>
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
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 3.3 3.2 3.1 3.0)
if(PythonInterp_FIND_VERSION)
if(PythonInterp_FIND_VERSION MATCHES "^[0-9]+\\.[0-9]+(\\.[0-9]+.*)?$")
string(REGEX REPLACE "^([0-9]+\\.[0-9]+).*" "\\1" _PYTHON_FIND_MAJ_MIN "${PythonInterp_FIND_VERSION}")
string(REGEX REPLACE "^([0-9]+).*" "\\1" _PYTHON_FIND_MAJ "${_PYTHON_FIND_MAJ_MIN}")
list(APPEND _Python_NAMES python${_PYTHON_FIND_MAJ_MIN} python${_PYTHON_FIND_MAJ})
unset(_PYTHON_FIND_OTHER_VERSIONS)
if(NOT PythonInterp_FIND_VERSION_EXACT)
foreach(_PYTHON_V ${_PYTHON${_PYTHON_FIND_MAJ}_VERSIONS})
if(NOT _PYTHON_V VERSION_LESS _PYTHON_FIND_MAJ_MIN)
list(APPEND _PYTHON_FIND_OTHER_VERSIONS ${_PYTHON_V})
endif()
endforeach()
endif(NOT PythonInterp_FIND_VERSION_EXACT)
unset(_PYTHON_FIND_MAJ_MIN)
unset(_PYTHON_FIND_MAJ)
else(PythonInterp_FIND_VERSION MATCHES "^[0-9]+\\.[0-9]+(\\.[0-9]+.*)?$")
list(APPEND _Python_NAMES python${PythonInterp_FIND_VERSION})
set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON${PythonInterp_FIND_VERSION}_VERSIONS})
endif(PythonInterp_FIND_VERSION MATCHES "^[0-9]+\\.[0-9]+(\\.[0-9]+.*)?$")
else(PythonInterp_FIND_VERSION)
set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON3_VERSIONS} ${_PYTHON2_VERSIONS} ${_PYTHON1_VERSIONS})
endif(PythonInterp_FIND_VERSION)
list(APPEND _Python_NAMES python)
# Search for the current active python version first
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}
${_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 ${_Python_VERSIONS})
set(_Python_NAMES python${_CURRENT_VERSION})
if(WIN32)
list(APPEND _Python_NAMES python)
endif()
find_program(PYTHON_EXECUTABLE
NAMES ${_Python_NAMES}
PATHS [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]
)
endforeach()
endif()
# determine python version string
if(PYTHON_EXECUTABLE)
execute_process(COMMAND "${PYTHON_EXECUTABLE}" -E -c
"import sys; sys.stdout.write(';'.join([str(x) for x in sys.version_info[:3]]))"
OUTPUT_VARIABLE _VERSION
RESULT_VARIABLE _PYTHON_VERSION_RESULT
ERROR_QUIET)
if(NOT _PYTHON_VERSION_RESULT)
string(REPLACE ";" "." PYTHON_VERSION_STRING "${_VERSION}")
# just to make sure as some programs (i.e. pydoc) do not return a non-zero
# exit code even though called with unknown option. This happened by mistake
# once when pydoc was specified instead of python as PYTHON_EXECUTABLE
if(NOT PYTHON_VERSION_STRING MATCHES "^[0-9]+\\.[0-9]+\\.[0-9]+.*")
message(WARNING "Version string returned by Python executable\n"
"\tPYTHON_EXECUTABLE = ${PYTHON_EXECUTABLE}"
"\tPYTHON_VERSION_STRING = ${PYTHON_VERSION_STRING}"
"\ndoes not match the expected format: <major>.<minor>.<patch>")
endif()
list(GET _VERSION 0 PYTHON_VERSION_MAJOR)
list(GET _VERSION 1 PYTHON_VERSION_MINOR)
list(GET _VERSION 2 PYTHON_VERSION_PATCH)
if(PYTHON_VERSION_PATCH EQUAL 0)
# it's called "Python 2.7", not "2.7.0"
string(REGEX REPLACE "\\.0$" "" PYTHON_VERSION_STRING "${PYTHON_VERSION_STRING}")
endif()
else()
# sys.version predates sys.version_info, so use that
execute_process(COMMAND "${PYTHON_EXECUTABLE}" -E -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 "${PYTHON_VERSION_STRING}")
if(PYTHON_VERSION_STRING MATCHES "^[0-9]+\\.[0-9]+\\.[0-9]+.*")
string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" PYTHON_VERSION_PATCH "${PYTHON_VERSION_STRING}")
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(PYTHON_EXECUTABLE)
# handle the QUIETLY and REQUIRED arguments and set PYTHONINTERP_FOUND to TRUE if
# all listed variables are TRUE
include(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(PythonInterp REQUIRED_VARS PYTHON_EXECUTABLE VERSION_VAR PYTHON_VERSION_STRING)
mark_as_advanced(PYTHON_EXECUTABLE)