Index: cfe/trunk/CMakeLists.txt
===================================================================
--- cfe/trunk/CMakeLists.txt
+++ cfe/trunk/CMakeLists.txt
@@ -129,7 +129,6 @@
   set( CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX} )
 
   if(LLVM_INCLUDE_TESTS)
-    set(Python_ADDITIONAL_VERSIONS 2.7)
     include(FindPythonInterp)
     if(NOT PYTHONINTERP_FOUND)
       message(FATAL_ERROR
Index: compiler-rt/trunk/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/CMakeLists.txt
+++ compiler-rt/trunk/CMakeLists.txt
@@ -80,7 +80,6 @@
   endif()
 
   # Find Python interpreter.
-  set(Python_ADDITIONAL_VERSIONS 2.7 2.6 2.5)
   include(FindPythonInterp)
   if(NOT PYTHONINTERP_FOUND)
     message(FATAL_ERROR "
Index: lld/trunk/CMakeLists.txt
===================================================================
--- lld/trunk/CMakeLists.txt
+++ lld/trunk/CMakeLists.txt
@@ -56,7 +56,6 @@
   include(HandleLLVMOptions)
 
   if(LLVM_INCLUDE_TESTS)
-    set(Python_ADDITIONAL_VERSIONS 2.7)
     include(FindPythonInterp)
     if(NOT PYTHONINTERP_FOUND)
       message(FATAL_ERROR
Index: llvm/trunk/CMakeLists.txt
===================================================================
--- llvm/trunk/CMakeLists.txt
+++ llvm/trunk/CMakeLists.txt
@@ -642,8 +642,6 @@
 
 include(HandleLLVMOptions)
 
-# We support both Python 2 and 3.
-set(Python_ADDITIONAL_VERSIONS 3.7 3.6 3.5 2.7)
 include(FindPythonInterp)
 if( NOT PYTHONINTERP_FOUND )
   message(FATAL_ERROR
Index: llvm/trunk/docs/GettingStarted.rst
===================================================================
--- llvm/trunk/docs/GettingStarted.rst
+++ llvm/trunk/docs/GettingStarted.rst
@@ -598,6 +598,11 @@
 | CMAKE_INSTALL_PREFIX    | Specifies the install directory to target when     |
 |                         | running the install action of the build files.     |
 +-------------------------+----------------------------------------------------+
+| PYTHON_EXECUTABLE       | Forces CMake to use a specific Python version by   |
+|                         | passing a path to a Python interpreter. By default |
+|                         | the Python version of the interpreter in your PATH |
+|                         | is used.                                           |
++-------------------------+----------------------------------------------------+
 | LLVM_TARGETS_TO_BUILD   | A semicolon delimited list controlling which       |
 |                         | targets will be built and linked into llvm.        |
 |                         | The default list is defined as                     |