pro2cmake.py: Generate .cmake.conf files for versioning

And create one for QtBase at the same time.

Fixes: QTBUG-83835
Change-Id: Icc6b022165a57bd4e22c23bdb0016522b99a5b80
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

.cmake.conf

@@ -0,0 +1 @@
+set(QT_REPO_MODULE_VERSION "6.0.0")

CMakeLists.txt

@@ -14,8 +14,9 @@ if (CMAKE_CROSSCOMPILING AND CMAKE_SYSROOT)
     set(ENV{PKG_CONFIG_SYSROOT_DIR} ${CMAKE_SYSROOT})
 endif()
 
+include(".cmake.conf")
 project(QtBase
-    VERSION 6.0.0
+    VERSION "${QT_REPO_MODULE_VERSION}"
     DESCRIPTION "Qt Base Libraries"
     HOMEPAGE_URL "https://qt.io/"
     LANGUAGES CXX C ASM

util/cmake/pro2cmake.py

@@ -3846,8 +3846,9 @@ def handle_top_level_repo_project(scope: Scope, cm_fh: IO[str]):
         f"""\
                 cmake_minimum_required(VERSION {cmake_version_string})
 
+                include(.cmake.conf)
                 project({qt_lib}
-                    VERSION 6.0.0
+                    VERSION "${{QT_REPO_MODULE_VERSION}}"
                     DESCRIPTION "Qt {qt_lib_no_prefix} Libraries"
                     HOMEPAGE_URL "https://qt.io/"
                     LANGUAGES CXX C
@@ -3868,6 +3869,15 @@ def handle_top_level_repo_project(scope: Scope, cm_fh: IO[str]):
     cm_fh.write(f"{header}{expand_project_requirements(scope)}{build_repo}")
 
 
+def create_top_level_cmake_conf():
+    conf_file_name = ".cmake.conf"
+    try:
+        with open(conf_file_name, 'x') as file:
+            file.write("set(QT_REPO_MODULE_VERSION \"6.0.0\")\n")
+    except FileExistsError as _:
+        pass
+
+
 def find_top_level_repo_project_file(project_file_path: str = "") -> Optional[str]:
     qmake_conf_path = find_qmake_conf(project_file_path)
     qmake_dir = os.path.dirname(qmake_conf_path)
@@ -4034,6 +4044,7 @@ def cmakeify_scope(
 
     # Handle top level repo project in a special way.
     if is_top_level_repo_project(scope.file_absolute_path):
+        create_top_level_cmake_conf()
         handle_top_level_repo_project(scope, temp_buffer)
     # Same for top-level tests.
     elif is_top_level_repo_tests_project(scope.file_absolute_path):