cmake/debian/patches/0001-Prefer-default-Python-version.patch

From: =?utf-8?q?Timo_R=C3=B6hling?= <roehling@debian.org>
Date: Thu, 24 Nov 2022 21:40:09 +0100
Subject: Prefer default Python version

This patch prefers /usr/bin/python3 as interpreter over all others,
subject to version restrictions. CMP0094 is forced to the NEW
behavior, because the OLD behavior will always end up with the newest
installed Python version.

Forwarded: not-needed
---
 Modules/FindPython/Support.cmake | 9 ++-------
 Modules/FindPythonInterp.cmake   | 1 +
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/Modules/FindPython/Support.cmake b/Modules/FindPython/Support.cmake
index 7a127e4..cfa852d 100644
--- a/Modules/FindPython/Support.cmake
+++ b/Modules/FindPython/Support.cmake
@@ -1250,12 +1250,7 @@ endif()
 unset (${_PYTHON_PREFIX}_SOABI)
 
 # Define lookup strategy
-cmake_policy (GET CMP0094 _${_PYTHON_PREFIX}_LOOKUP_POLICY)
-if (_${_PYTHON_PREFIX}_LOOKUP_POLICY STREQUAL "NEW")
-  set (_${_PYTHON_PREFIX}_FIND_STRATEGY "LOCATION")
-else()
-  set (_${_PYTHON_PREFIX}_FIND_STRATEGY "VERSION")
-endif()
+set (_${_PYTHON_PREFIX}_FIND_STRATEGY "LOCATION")
 if (DEFINED ${_PYTHON_PREFIX}_FIND_STRATEGY)
   if (NOT ${_PYTHON_PREFIX}_FIND_STRATEGY MATCHES "^(VERSION|LOCATION)$")
     message (AUTHOR_WARNING "Find${_PYTHON_PREFIX}: ${${_PYTHON_PREFIX}_FIND_STRATEGY}: invalid value for '${_PYTHON_PREFIX}_FIND_STRATEGY'. 'VERSION' or 'LOCATION' expected.")
@@ -1436,7 +1431,7 @@ if (DEFINED ${_PYTHON_PREFIX}_FIND_UNVERSIONED_NAMES)
     set (_${_PYTHON_PREFIX}_FIND_UNVERSIONED_NAMES ${${_PYTHON_PREFIX}_FIND_UNVERSIONED_NAMES})
   endif()
 else()
-  set (_${_PYTHON_PREFIX}_FIND_UNVERSIONED_NAMES LAST)
+  set (_${_PYTHON_PREFIX}_FIND_UNVERSIONED_NAMES FIRST)
 endif()
 
 
diff --git a/Modules/FindPythonInterp.cmake b/Modules/FindPythonInterp.cmake
index 7ad3587..70f4446 100644
--- a/Modules/FindPythonInterp.cmake
+++ b/Modules/FindPythonInterp.cmake
@@ -94,6 +94,7 @@ if(DEFINED PYTHONLIBS_VERSION_STRING)
 endif()
 # Search for the current active python version first
 list(APPEND _Python_VERSIONS ";")
+list(APPEND _Python_VERSIONS "3")
 list(APPEND _Python_VERSIONS ${_PYTHON_FIND_OTHER_VERSIONS})
 
 unset(_PYTHON_FIND_OTHER_VERSIONS)