FindPython*: simplify version selection

CMake already provides the version components split into variables, no need to
split them again.

Modules/FindPythonInterp.cmake

@@ -36,28 +36,30 @@ 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${_PYTHON_FIND_MAJ})
+    if(PythonInterp_FIND_VERSION_COUNT GREATER 1)
+        set(_PYTHON_FIND_MAJ_MIN "${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 ${_PYTHON${_PYTHON_FIND_MAJ}_VERSIONS})
+            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 ${_PYTHON_V})
                 endif()
              endforeach()
         endif()
         unset(_PYTHON_FIND_MAJ_MIN)
-        unset(_PYTHON_FIND_MAJ)
     else()
-        list(APPEND _Python_NAMES python${PythonInterp_FIND_VERSION})
-        set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON${PythonInterp_FIND_VERSION}_VERSIONS})
+        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()
 
+message(STATUS "names ${_Python_NAMES}")
+message(STATUS "other versions ${_PYTHON_FIND_OTHER_VERSIONS}")
 list(APPEND _Python_NAMES python)
 
 # Search for the current active python version first

Modules/FindPythonLibs.cmake

@@ -41,9 +41,8 @@ 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(PythonLibs_FIND_VERSION)
-    if(PythonLibs_FIND_VERSION MATCHES "^[0-9]+\\.[0-9]+(\\.[0-9]+.*)?$")
-        string(REGEX REPLACE "^([0-9]+\\.[0-9]+).*" "\\1" _PYTHON_FIND_MAJ_MIN "${PythonLibs_FIND_VERSION}")
-        string(REGEX REPLACE "^([0-9]+).*" "\\1" _PYTHON_FIND_MAJ "${_PYTHON_FIND_MAJ_MIN}")
+    if(PythonLibs_FIND_VERSION_COUNT GREATER 1)
+        set(_PYTHON_FIND_MAJ_MIN "${PythonLibs_FIND_VERSION_MAJOR}.${PythonLibs_FIND_VERSION_MINOR}")
         unset(_PYTHON_FIND_OTHER_VERSIONS)
         if(PythonLibs_FIND_VERSION_EXACT)
             if(_PYTHON_FIND_MAJ_MIN STREQUAL PythonLibs_FIND_VERSION)
@@ -52,16 +51,15 @@ if(PythonLibs_FIND_VERSION)
                 set(_PYTHON_FIND_OTHER_VERSIONS "${PythonLibs_FIND_VERSION}" "${_PYTHON_FIND_MAJ_MIN}")
             endif()
         else()
-            foreach(_PYTHON_V ${_PYTHON${_PYTHON_FIND_MAJ}_VERSIONS})
+            foreach(_PYTHON_V ${_PYTHON${PythonLibs_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)
-        unset(_PYTHON_FIND_MAJ)
     else()
-        set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON${PythonLibs_FIND_VERSION}_VERSIONS})
+        set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON${PythonLibs_FIND_VERSION_MAJOR}_VERSIONS})
     endif()
 else()
     set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON3_VERSIONS} ${_PYTHON2_VERSIONS} ${_PYTHON1_VERSIONS})