[CMake] Don't set Python_ADDITIONAL_VERSIONS

Until recently, Python_ADDITIONAL_VERSIONS was used to limit LLVM's Python support to 2.7. Now that both LLVM and LLDB both support Python 3, there's no longer a need to put an arbitrary limit on this. However, instead of removing the variable, r365692 expanded the list, which has the (presumably unintentional) side-effect of expression preference for Python 3. Instead, as Michal proposed in the original code review, we should just not set the list at all, and let CMake pick whatever Python interpreter you have in your path. This patch removes the Python_ADDITIONAL_VERSIONS variable in llvm, clang and lld. I've also updated the docs with the default behavior and how to force a different Python version to be used. Differential revision: https://reviews.llvm.org/D64894 llvm-svn: 366447
dabrahams · Jul 18, 2019 · a5359b1 · a5359b1
1 parent ac958c2
commit a5359b1
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Showing 5 changed files with 5 additions and 5 deletions.
diff --git a/clang/CMakeLists.txt b/clang/CMakeLists.txt
@@ -129,7 +129,6 @@ 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)
-    set(Python_ADDITIONAL_VERSIONS 2.7)
     include(FindPythonInterp)
     if(NOT PYTHONINTERP_FOUND)
       message(FATAL_ERROR

diff --git a/compiler-rt/CMakeLists.txt b/compiler-rt/CMakeLists.txt
@@ -80,7 +80,6 @@ if (COMPILER_RT_STANDALONE_BUILD)
   endif()
 
   # Find Python interpreter.
-  set(Python_ADDITIONAL_VERSIONS 2.7 2.6 2.5)
   include(FindPythonInterp)
   if(NOT PYTHONINTERP_FOUND)
     message(FATAL_ERROR "

diff --git a/lld/CMakeLists.txt b/lld/CMakeLists.txt
@@ -56,7 +56,6 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
   include(HandleLLVMOptions)
 
   if(LLVM_INCLUDE_TESTS)
-    set(Python_ADDITIONAL_VERSIONS 2.7)
     include(FindPythonInterp)
     if(NOT PYTHONINTERP_FOUND)
       message(FATAL_ERROR

diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
@@ -642,8 +642,6 @@ option(LLVM_ENABLE_PLUGINS "Enable plugin support" ${LLVM_ENABLE_PLUGINS_default
 
 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

diff --git a/llvm/docs/GettingStarted.rst b/llvm/docs/GettingStarted.rst
@@ -598,6 +598,11 @@ used by people developing LLVM.
 | 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                     |