FindPython: ensure reproductibility between CMake calls

Ensures, when CMake is re-launched with some artifacts specified by the user,
that the multiple runs of CMake give always the same result.

Fixes: #26778

Modules/FindPython/Support.cmake

@@ -79,6 +79,53 @@ function (_PYTHON_MARK_AS_INTERNAL)
 endfunction()
 
 
+function (_PYTHON_RESET_ARTIFACTS comp)
+  set(components ${comp})
+  if (comp STREQUAL "Interpreter")
+    list (APPEND components Compiler Development NumPy)
+  endif()
+  if (comp STREQUAL "Development")
+    list (APPEND components NumPy)
+  endif()
+  set(find_components ${${_PYTHON_BASE}_FIND_COMPONENTS})
+  list(TRANSFORM find_components REPLACE "^Development.*" "Development")
+  list(REMOVE_DUPLICATES find_components)
+
+  foreach (component IN LISTS components)
+    if (NOT component IN_LIST find_components)
+      continue()
+    endif()
+    if (component STREQUAL "Interpreter")
+      unset(_${_PYTHON_PREFIX}_EXECUTABLE CACHE)
+    endif()
+    if (component STREQUAL "Compiler"
+        AND "IronPython" IN_LIST _${_PYTHON_PREFIX}_FIND_IMPLEMENTATIONS)
+      unset(_${_PYTHON_PREFIX}_COMPILER CACHE)
+    endif()
+    if (component STREQUAL "Development")
+      set(artifacts ${ARGN})
+      if (NOT artifacts)
+        set(artifacts LIBRARY SABI_LIBRARY INCLUDE_DIR)
+      endif()
+      unset(_${_PYTHON_PREFIX}_CONFIG)
+      foreach (artifact IN LISTS artifacts)
+        if (artifact IN_LIST _${_PYTHON_PREFIX}_FIND_DEVELOPMENT_ARTIFACTS)
+          if (artifact MATCHES "LIBRARY")
+            unset(_${_PYTHON_PREFIX}_${artifact}_RELEASE CACHE)
+            unset(_${_PYTHON_PREFIX}_${artifact}_DEBUG CACHE)
+          elseif(arifact STREQUAL "INCLUDE_DIR")
+            unset(_${_PYTHON_PREFIX}_${artifact} CACHE)
+          endif()
+        endif()
+      endforeach()
+    endif()
+    if (component STREQUAL "NumPy")
+      unset(_${_PYTHON_PREFIX}_NumPy_INCLUDE_DIR CACHE)
+    endif()
+  endforeach()
+endfunction()
+
+
 macro (_PYTHON_SELECT_LIBRARY_CONFIGURATIONS _PYTHON_BASENAME)
   if(NOT DEFINED ${_PYTHON_BASENAME}_LIBRARY_RELEASE)
     set(${_PYTHON_BASENAME}_LIBRARY_RELEASE "${_PYTHON_BASENAME}_LIBRARY_RELEASE-NOTFOUND")
@@ -1915,6 +1962,8 @@ if ("Interpreter" IN_LIST ${_PYTHON_BASE}_FIND_COMPONENTS)
     if (NOT ${_PYTHON_PREFIX}_EXECUTABLE STREQUAL _${_PYTHON_PREFIX}_EXECUTABLE)
       # invalidate cache properties
       unset (_${_PYTHON_PREFIX}_INTERPRETER_PROPERTIES CACHE)
+      # invalidate the previous results for any other requested components
+      _python_reset_artifacts(Interpreter)
     endif()
     set (_${_PYTHON_PREFIX}_EXECUTABLE "${${_PYTHON_PREFIX}_EXECUTABLE}" CACHE INTERNAL "")
     unset (_${_PYTHON_PREFIX}_EXECUTABLE_DEBUG CACHE)
@@ -2821,18 +2870,17 @@ if (("Development.Module" IN_LIST ${_PYTHON_BASE}_FIND_COMPONENTS
 
   if (DEFINED ${_PYTHON_PREFIX}_LIBRARY
       AND IS_ABSOLUTE "${${_PYTHON_PREFIX}_LIBRARY}")
+    _python_reset_artifacts(Development)
     set (_${_PYTHON_PREFIX}_LIBRARY_RELEASE "${${_PYTHON_PREFIX}_LIBRARY}" CACHE INTERNAL "")
-    unset (_${_PYTHON_PREFIX}_LIBRARY_DEBUG CACHE)
-    unset (_${_PYTHON_PREFIX}_INCLUDE_DIR CACHE)
   endif()
   if (DEFINED ${_PYTHON_PREFIX}_SABI_LIBRARY
       AND IS_ABSOLUTE "${${_PYTHON_PREFIX}_SABI_LIBRARY}")
+    _python_reset_artifacts(Development SABI_LIBRARY INCLUDE_DIR)
     set (_${_PYTHON_PREFIX}_SABI_LIBRARY_RELEASE "${${_PYTHON_PREFIX}_SABI_LIBRARY}" CACHE INTERNAL "")
-    unset (_${_PYTHON_PREFIX}_SABI_LIBRARY_DEBUG CACHE)
-    unset (_${_PYTHON_PREFIX}_INCLUDE_DIR CACHE)
   endif()
   if (DEFINED ${_PYTHON_PREFIX}_INCLUDE_DIR
       AND IS_ABSOLUTE "${${_PYTHON_PREFIX}_INCLUDE_DIR}")
+    _python_reset_artifacts(Development INCLUDE_DIR)
     set (_${_PYTHON_PREFIX}_INCLUDE_DIR "${${_PYTHON_PREFIX}_INCLUDE_DIR}" CACHE INTERNAL "")
   endif()