Python additional version support, bug #10279.

Introduced an additional variable, Python_ADDITIONAL_VERSIONS, to both
FindPythonLibs and FindPythonInterp. Changed FindPythonInterp to loop
over versions rather than hardcoding all versions (more like libs).

Modules/FindPythonInterp.cmake

@@ -2,8 +2,9 @@
 # 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
+#  PYTHONINTERP_FOUND         - Was the Python executable found
+#  PYTHON_EXECUTABLE          - path to the Python interpreter
+#  Python_ADDITIONAL_VERSIONS - list of additional Python versions to search for
 #
 
 #=============================================================================
@@ -19,25 +20,32 @@
 # (To distribute this file outside of CMake, substitute the full
 #  License text for the above reference.)
 
-FIND_PROGRAM(PYTHON_EXECUTABLE
-  NAMES python2.7 python2.6 python2.5 python2.4 python2.3 python2.2 python2.1 python2.0 python1.6 python1.5 python
-  PATHS
-  [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\2.7\\InstallPath]
-  [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\2.6\\InstallPath]
-  [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\2.5\\InstallPath]
-  [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\2.4\\InstallPath]
-  [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\2.3\\InstallPath]
-  [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\2.2\\InstallPath]
-  [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\2.1\\InstallPath]
-  [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\2.0\\InstallPath]
-  [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\1.6\\InstallPath]
-  [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\1.5\\InstallPath]
-  )
+# 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}
+  2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.6 1.5)
+
+# Run first with the Python version in the 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()
+# Now without any version if we still haven't found it
+if(NOT PYTHON_EXECUTABLE)
+  find_program(PYTHON_EXECUTABLE NAMES python)
+endif()
+
 
 # handle the QUIETLY and REQUIRED arguments and set PYTHONINTERP_FOUND to TRUE if
 # all listed variables are TRUE
-INCLUDE("${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake")
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(PythonInterp DEFAULT_MSG PYTHON_EXECUTABLE)
 
-MARK_AS_ADVANCED(PYTHON_EXECUTABLE)
-
+mark_as_advanced(PYTHON_EXECUTABLE)

Modules/FindPythonLibs.cmake

@@ -3,12 +3,12 @@
 # include files and libraries are. It also determines what the name of
 # the library is. This code sets the following variables:
 #
-#  PYTHONLIBS_FOUND       - have the Python libs been found
-#  PYTHON_LIBRARIES       - path to the python library
-#  PYTHON_INCLUDE_PATH    - path to where Python.h is found (deprecated)
-#  PYTHON_INCLUDE_DIRS    - path to where Python.h is found
-#  PYTHON_DEBUG_LIBRARIES - path to the debug library
-#
+#  PYTHONLIBS_FOUND           - have the Python libs been found
+#  PYTHON_LIBRARIES           - path to the python library
+#  PYTHON_INCLUDE_PATH        - path to where Python.h is found (deprecated)
+#  PYTHON_INCLUDE_DIRS        - path to where Python.h is found
+#  PYTHON_DEBUG_LIBRARIES     - path to the debug library
+#  Python_ADDITIONAL_VERSIONS - list of additional Python versions to search for
 
 #=============================================================================
 # Copyright 2001-2009 Kitware, Inc.
@@ -27,7 +27,13 @@ INCLUDE(CMakeFindFrameworks)
 # Search for the python framework on Apple.
 CMAKE_FIND_FRAMEWORKS(Python)
 
-FOREACH(_CURRENT_VERSION 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.6 1.5)
+# 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}
+  2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.6 1.5)
+
+FOREACH(_CURRENT_VERSION ${_Python_VERSIONS})
   STRING(REPLACE "." "" _CURRENT_VERSION_NO_DOTS ${_CURRENT_VERSION})
   IF(WIN32)
     FIND_LIBRARY(PYTHON_DEBUG_LIBRARY
@@ -53,7 +59,7 @@ FOREACH(_CURRENT_VERSION 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.6 1.5)
     PATH_SUFFIXES python${_CURRENT_VERSION}/config
   )
 
-  # For backward compatibility, honour value of PYTHON_INCLUDE_PATH, if 
+  # For backward compatibility, honour value of PYTHON_INCLUDE_PATH, if
   # PYTHON_INCLUDE_DIR is not set.
   IF(DEFINED PYTHON_INCLUDE_PATH AND NOT DEFINED PYTHON_INCLUDE_DIR)
     SET(PYTHON_INCLUDE_DIR "${PYTHON_INCLUDE_PATH}" CACHE PATH
@@ -78,9 +84,9 @@ FOREACH(_CURRENT_VERSION 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.6 1.5)
   )
 
   # For backward compatibility, set PYTHON_INCLUDE_PATH, but make it internal.
-  SET(PYTHON_INCLUDE_PATH "${PYTHON_INCLUDE_DIR}" CACHE INTERNAL 
+  SET(PYTHON_INCLUDE_PATH "${PYTHON_INCLUDE_DIR}" CACHE INTERNAL
     "Path to where Python.h is found (deprecated)")
-  
+
 ENDFOREACH(_CURRENT_VERSION)
 
 MARK_AS_ADVANCED(
@@ -103,7 +109,7 @@ FIND_PACKAGE_HANDLE_STANDARD_ARGS(PythonLibs DEFAULT_MSG PYTHON_LIBRARIES PYTHON
 
 
 # PYTHON_ADD_MODULE(<name> src1 src2 ... srcN) is used to build modules for python.
-# PYTHON_WRITE_MODULES_HEADER(<filename>) writes a header file you can include 
+# PYTHON_WRITE_MODULES_HEADER(<filename>) writes a header file you can include
 # in your sources to initialize the static python modules
 FUNCTION(PYTHON_ADD_MODULE _NAME )
   GET_PROPERTY(_TARGET_SUPPORTS_SHARED_LIBS
@@ -148,7 +154,7 @@ FUNCTION(PYTHON_WRITE_MODULES_HEADER _filename)
 
   SET(_filenameTmp "${_filename}.in")
   FILE(WRITE ${_filenameTmp} "/*Created by cmake, do not edit, changes will be lost*/\n")
-  FILE(APPEND ${_filenameTmp} 
+  FILE(APPEND ${_filenameTmp}
 "#ifndef ${_nameUpper}
 #define ${_nameUpper}
 
@@ -164,7 +170,7 @@ extern \"C\" {
     FILE(APPEND ${_filenameTmp} "extern void init${PYTHON_MODULE_PREFIX}${_currentModule}(void);\n\n")
   ENDFOREACH(_currentModule ${PY_STATIC_MODULES_LIST})
 
-  FILE(APPEND ${_filenameTmp} 
+  FILE(APPEND ${_filenameTmp}
 "#ifdef __cplusplus
 }
 #endif /* __cplusplus */
@@ -182,7 +188,7 @@ extern \"C\" {
   ENDFOREACH(_currentModule ${PY_STATIC_MODULES_LIST})
   FILE(APPEND ${_filenameTmp} "}\n\n")
   FILE(APPEND ${_filenameTmp} "#ifndef EXCLUDE_LOAD_ALL_FUNCTION\nvoid CMakeLoadAllPythonModules(void)\n{\n  ${_name}_LoadAllPythonModules();\n}\n#endif\n\n#endif\n")
-  
+
 # with CONFIGURE_FILE() cmake complains that you may not use a file created using FILE(WRITE) as input file for CONFIGURE_FILE()
   EXECUTE_PROCESS(COMMAND ${CMAKE_COMMAND} -E copy_if_different "${_filenameTmp}" "${_filename}" OUTPUT_QUIET ERROR_QUIET)