Remove Python2 fallback and only advertise Python3 in the doc

Differential Revision: https://www.youtube.com/watch?v=RsL0cipURA0

clang/CMakeLists.txt

@@ -135,20 +135,7 @@ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
   set( CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX} )
 
   if(LLVM_INCLUDE_TESTS)
-    find_package(Python3 COMPONENTS Interpreter)
+    find_package(Python3 REQUIRED COMPONENTS Interpreter)
-    if(NOT Python3_Interpreter_FOUND)
-      message(WARNING "Python3 not found, using python2 as a fallback")
-      find_package(Python2 COMPONENTS Interpreter REQUIRED)
-      if(Python2_VERSION VERSION_LESS 2.7)
-        message(SEND_ERROR "Python 2.7 or newer is required")
-      endif()
-
-      # Treat python2 as python3
-      add_executable(Python3::Interpreter IMPORTED)
-      set_target_properties(Python3::Interpreter PROPERTIES
-        IMPORTED_LOCATION ${Python2_EXECUTABLE})
-      set(Python3_EXECUTABLE ${Python2_EXECUTABLE})
-    endif()
 
     # Check prebuilt llvm/utils.
     if(EXISTS ${LLVM_TOOLS_BINARY_DIR}/FileCheck${CMAKE_EXECUTABLE_SUFFIX}

clang/tools/scan-build-py/README.md

@@ -19,7 +19,7 @@ Should be working on UNIX operating systems.
 Prerequisites
 -------------
 
-1. **python** interpreter (version 2.7, 3.2, 3.3, 3.4, 3.5).
+1. **python** interpreter (version 3.6 or later).
 
 
 How to use

clang/tools/scan-build/bin/set-xcode-analyzer

@@ -5,8 +5,8 @@
 # This one has the scripting bridge enabled.
 
 import sys
-if sys.version_info < (2, 7):
+if sys.version_info < (3, 6):
-    print "set-xcode-analyzer requires Python 2.7 or later"
+    print "set-xcode-analyzer requires Python 3.6 or later"
     sys.exit(1)
 
 import os

lld/CMakeLists.txt

@@ -57,20 +57,7 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
   include(CheckAtomic)
 
   if(LLVM_INCLUDE_TESTS)
-    find_package(Python3 COMPONENTS Interpreter)
+    find_package(Python3 REQUIRED COMPONENTS Interpreter)
-    if(NOT Python3_Interpreter_FOUND)
-      message(WARNING "Python3 not found, using python2 as a fallback")
-      find_package(Python2 COMPONENTS Interpreter REQUIRED)
-      if(Python2_VERSION VERSION_LESS 2.7)
-        message(SEND_ERROR "Python 2.7 or newer is required")
-      endif()
-
-      # Treat python2 as python3
-      add_executable(Python3::Interpreter IMPORTED)
-      set_target_properties(Python3::Interpreter PROPERTIES
-        IMPORTED_LOCATION ${Python2_EXECUTABLE})
-      set(Python3_EXECUTABLE ${Python2_EXECUTABLE})
-    endif()
 
     # Check prebuilt llvm/utils.
     if(EXISTS ${LLVM_TOOLS_BINARY_DIR}/FileCheck${CMAKE_EXECUTABLE_SUFFIX}

lldb/docs/resources/build.rst

@@ -73,7 +73,7 @@ commands below.
   > yum install libedit-devel libxml2-devel ncurses-devel python-devel swig
   > sudo apt-get install build-essential subversion swig python3-dev libedit-dev libncurses5-dev
   > pkg install swig python
-  > pkgin install swig python27 cmake ninja-build
+  > pkgin install swig python36 cmake ninja-build
   > brew install swig cmake ninja
 
 Note that there's an `incompatibility

llvm/CMakeLists.txt

@@ -708,20 +708,7 @@ set(ENABLE_EXPERIMENTAL_NEW_PASS_MANAGER FALSE CACHE BOOL
 
 include(HandleLLVMOptions)
 
-find_package(Python3 COMPONENTS Interpreter)
+find_package(Python3 REQUIRED COMPONENTS Interpreter)
-if(NOT Python3_Interpreter_FOUND)
-  message(WARNING "Python3 not found, using python2 as a fallback")
-  find_package(Python2 COMPONENTS Interpreter REQUIRED)
-  if(Python2_VERSION VERSION_LESS 2.7)
-    message(SEND_ERROR "Python 2.7 or newer is required")
-  endif()
-
-  # Treat python2 as python3
-  add_executable(Python3::Interpreter IMPORTED)
-  set_target_properties(Python3::Interpreter PROPERTIES
-    IMPORTED_LOCATION ${Python2_EXECUTABLE})
-  set(Python3_EXECUTABLE ${Python2_EXECUTABLE})
-endif()
 
 ######
 

llvm/docs/GettingStarted.rst

@@ -170,7 +170,7 @@ Package                                                     Version      Notes
 =========================================================== ============ ==========================================
 `CMake <http://cmake.org/>`__                               >=3.13.4     Makefile/workspace generator
 `GCC <http://gcc.gnu.org/>`_                                >=5.1.0      C/C++ compiler\ :sup:`1`
-`python <http://www.python.org/>`_                          >=2.7        Automated test suite\ :sup:`2`
+`python <http://www.python.org/>`_                          >=3.6        Automated test suite\ :sup:`2`
 `zlib <http://zlib.net>`_                                   >=1.2.3.4    Compression library\ :sup:`3`
 `GNU Make <http://savannah.gnu.org/projects/make>`_         3.79, 3.79.1 Makefile/build processor\ :sup:`4`
 =========================================================== ============ ==========================================

llvm/docs/GettingStartedVS.rst

@@ -51,7 +51,7 @@ You will also need the `CMake <http://www.cmake.org/>`_ build system since it
 generates the project files you will use to build with.
 
 If you would like to run the LLVM tests you will need `Python
-<http://www.python.org/>`_. Version 2.7 and newer are known to work. You will
+<http://www.python.org/>`_. Version 3.6 and newer are known to work. You will
 need `GnuWin32 <http://gnuwin32.sourceforge.net/>`_ tools, too.
 
 Do not install the LLVM directory tree into a path containing spaces (e.g.

llvm/docs/HowToBuildOnARM.rst

@@ -41,7 +41,6 @@ on the ARMv6 and ARMv7 architectures and may be inapplicable to older chips.
 
      Use Ninja instead of Make: "-G Ninja"
      Build with assertions on: "-DLLVM_ENABLE_ASSERTIONS=True"
-     Force Python2: "-DPYTHON_EXECUTABLE=/usr/bin/python2"
      Local (non-sudo) install path: "-DCMAKE_INSTALL_PREFIX=$HOME/llvm/install"
      CPU flags: "DCMAKE_C_FLAGS=-mcpu=cortex-a15" (same for CXX_FLAGS)
 

llvm/docs/TestingGuide.rst

@@ -23,7 +23,7 @@ Requirements
 ============
 
 In order to use the LLVM testing infrastructure, you will need all of the
-software required to build LLVM, as well as `Python <http://python.org>`_ 2.7 or
+software required to build LLVM, as well as `Python <http://python.org>`_ 3.6 or
 later.
 
 LLVM Testing Infrastructure Organization