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FindPythonInterp: rework the version detection 

There are versions out there that neither understand --version nor -V. Try a
completely different approach: execute a small python script that prints the
version number (and only that) in an easily reusable way using
sys.version_info. This is documented to work since Python 2.0. Use sys.version
for older versions, which is documented to exist since 1.5. If even that
doesn't work then simply assume we are on 1.4.0.
This commit is contained in:
Rolf Eike Beer 2012-02-26 09:29:02 +01:00
parent e8e964f675
commit 7d6db93de9
1 changed files with 35 additions and 16 deletions
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51
Modules/FindPythonInterp.cmake
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@ -15,6 +15,7 @@
#=============================================================================
# Copyright 2005-2010 Kitware, Inc.
# Copyright 2011 Bjoern Ricks <bjoern.ricks@gmail.com>
# Copyright 2012 Rolf Eike Beer <eike@sf-mail.de>
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
@ -88,24 +89,42 @@ endif()
# determine python version string
if(PYTHON_EXECUTABLE)
execute_process(COMMAND "${PYTHON_EXECUTABLE}" --version
ERROR_VARIABLE _VERSION
execute_process(COMMAND "${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
OUTPUT_QUIET
ERROR_STRIP_TRAILING_WHITESPACE)
if(_PYTHON_VERSION_RESULT)
execute_process(COMMAND "${PYTHON_EXECUTABLE}" -V
ERROR_VARIABLE _VERSION
ERROR_QUIET)
if(NOT _PYTHON_VERSION_RESULT)
string(REPLACE ";" "." PYTHON_VERSION_STRING "${_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 "${PYTHON_EXECUTABLE}" -c "import sys; sys.stdout.write(sys.version)"
OUTPUT_VARIABLE _VERSION
RESULT_VARIABLE _PYTHON_VERSION_RESULT
OUTPUT_QUIET
ERROR_STRIP_TRAILING_WHITESPACE)
endif(_PYTHON_VERSION_RESULT)
if(NOT _PYTHON_VERSION_RESULT AND _VERSION MATCHES "^Python [0-9]+\\.[0-9]+.*")
string(REPLACE "Python " "" PYTHON_VERSION_STRING "${_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 "${PYTHON_VERSION_STRING}")
ERROR_QUIET)
if(NOT _PYTHON_VERSION_RESULT)
string(REGEX REPLACE " .*" "" PYTHON_VERSION_STRING "${_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_MAJOR "4")
set(PYTHON_VERSION_MAJOR "0")
endif()
endif()
unset(_PYTHON_VERSION_RESULT)