cmake: update FindPython3 module

* use the one shiped by the latest CMake (ab379e5054aa792df9572078dcf95bddd75f7661)
* use the new policy to use the new find strategy.
* accomodate the vanilla FindPython3 module to Ceph by:
  - dropping the `cmake_policy()` calls which set the policy not supported
    by 3.16.
  - `include (FindPackageHandleStandardArgs)` without specifying the
    relative path.
  - dropping the `HANDLE_VERSION_RANGE` from `FindPackageHandleStandardArgs()` call.
    this option was introduced by CMake v3.19, see
    https://cmake.org/cmake/help/latest/module/FindPackageHandleStandardArgs.html
    but Ubuntu focal comes with CMake 3.16, which is our minimal required CMake version.

the new FindPython3 module from CMake:

* enables us to find the recent Python intepreter and development files up to
  CPython 3.13.
* finds Python intepreter with the new `Python_FIND_STRATEGY`. the old and
  default strategy always finds the most recent version with all specified name
  and in all locations. so, if /usr/bin/python exists, it would accept, even
  if it is a symlink to python3.9 and what we want is python3.6. the
  new policy stops at the one which satisfies the constraints. this
  helps us to address the problem of issue we have when recreating
  the building system after the CMakeLists.txt is updated.

Fixes: https://tracker.ceph.com/issues/62428
Signed-off-by: Kefu Chai <tchaikov@gmail.com>

diff --git a/cmake/modules/FindPython/Support.cmake b/cmake/modules/FindPython/Support.cmake
index 5e1d6f62ecc64b1680b666a027120c5984d00e59..141c261dff65bedd749b7192995b4a5c9ea91ec4 100644 (file)
--- a/cmake/modules/FindPython/Support.cmake
+++ b/cmake/modules/FindPython/Support.cmake
@@ -24,7 +24,7 @@ if (NOT DEFINED _${_PYTHON_PREFIX}_REQUIRED_VERSION_MAJOR)
   message (FATAL_ERROR "FindPython: INTERNAL ERROR")
 endif()
 if (_${_PYTHON_PREFIX}_REQUIRED_VERSION_MAJOR EQUAL "3")
-  set(_${_PYTHON_PREFIX}_VERSIONS 3.12 3.11 3.10 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0)
+  set(_${_PYTHON_PREFIX}_VERSIONS 3.13 3.12 3.11 3.10 3.9 3.8 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0)
 elseif (_${_PYTHON_PREFIX}_REQUIRED_VERSION_MAJOR EQUAL "2")
   set(_${_PYTHON_PREFIX}_VERSIONS 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0)
 else()
@@ -3863,7 +3863,6 @@ endforeach()
 find_package_handle_standard_args (${_PYTHON_PREFIX}
                                    REQUIRED_VARS ${_${_PYTHON_PREFIX}_REQUIRED_VARS}
                                    VERSION_VAR ${_PYTHON_PREFIX}_VERSION
-                                   HANDLE_VERSION_RANGE
                                    HANDLE_COMPONENTS
                                    REASON_FAILURE_MESSAGE "${_${_PYTHON_PREFIX}_REASON_FAILURE}")