From a9e6de2acc1ac2e51b4d737b3abbeee3bf43832c Mon Sep 17 00:00:00 2001
From: Matt McCormick <matt.mccormick@kitware.com>
Date: Wed, 5 Mar 2014 17:01:26 -0500
Subject: FindPythonInterp: Use consistent version with PythonLibs (#13794)

If

  find_package(PythonLibs)
  find_package(PythonInterp)

is called, help PythonInterp to get a version of PYTHON_EXECUTABLE
consistent with the library versions found by PythonLibs.
---
 Modules/FindPythonInterp.cmake | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/Modules/FindPythonInterp.cmake b/Modules/FindPythonInterp.cmake
index 8da848c..780cda8 100644
--- a/Modules/FindPythonInterp.cmake
+++ b/Modules/FindPythonInterp.cmake
@@ -71,18 +71,23 @@ if(PythonInterp_FIND_VERSION)
 else()
     set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON3_VERSIONS} ${_PYTHON2_VERSIONS} ${_PYTHON1_VERSIONS})
 endif()
-
-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}
-  )
+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)
@@ -91,7 +96,7 @@ unset(_PYTHON3_VERSIONS)
 
 # Search for newest python version if python executable isn't found
 if(NOT PYTHON_EXECUTABLE)
-    foreach(_CURRENT_VERSION ${_Python_VERSIONS})
+    foreach(_CURRENT_VERSION IN LISTS _Python_VERSIONS)
       set(_Python_NAMES python${_CURRENT_VERSION})
       if(WIN32)
         list(APPEND _Python_NAMES python)
-- 
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