CMake: Modernize the CMake code

Instead of including just QtSetup, rely on qt_build_repo() like the
rest of our repos.

Because qt_build_repo does not automatically add the translations
subdirectory for processing, create a src subdirectory that is
auto-loaded by qt_build_repo.
Add the translations subdirectory to the src subdirectory.

This is needed for proper SBOM document generation which relies on
qt_build_repo being called.

Clean up some of the outdated comments left over from the qmake
porting.

Task-number: QTBUG-122899
Task-number: QTBUG-128320
Change-Id: I3b60393b162066dd2c2df2e9b1d45cb5f1fbd493
Reviewed-by: Joerg Bornemann <[email protected]>

Author: alcroito

CMakeLists.txt

@@ -1,12 +1,12 @@
-# Copyright (C) 2022 The Qt Company Ltd.
+# Copyright (C) 2024 The Qt Company Ltd.
 # SPDX-License-Identifier: BSD-3-Clause
 
 cmake_minimum_required(VERSION 3.16)
 
 include(.cmake.conf)
 project(QtTranslations
     VERSION "${QT_REPO_MODULE_VERSION}"
-    DESCRIPTION "Qt Translations"
+    DESCRIPTION "QtTranslations"
     HOMEPAGE_URL "https://qt.io/"
     LANGUAGES CXX C
 )
@@ -17,12 +17,5 @@ set(QT_USE_FIXED_QT_ADD_RESOURCE_BASE TRUE)
 set(QT_REPO_NOT_WARNINGS_CLEAN TRUE)
 find_package(Qt6 ${PROJECT_VERSION} CONFIG REQUIRED COMPONENTS BuildInternals Core)
 find_package(Qt6 ${PROJECT_VERSION} QUIET CONFIG OPTIONAL_COMPONENTS Linguist)
-qt_internal_project_setup()
 
-include(QtSetup) # for qt_install
-
-if(TARGET ${QT_CMAKE_EXPORT_NAMESPACE}::lupdate AND TARGET ${QT_CMAKE_EXPORT_NAMESPACE}::lconvert)
-    add_subdirectory(translations)
-else()
-    message(STATUS "Skipping adding translation custom targets due to missing lupdate or lconvert.")
-endif()
+qt_build_repo()

src/CMakeLists.txt

@@ -0,0 +1,8 @@
+# Copyright (C) 2024 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+if(TARGET ${QT_CMAKE_EXPORT_NAMESPACE}::lupdate AND TARGET ${QT_CMAKE_EXPORT_NAMESPACE}::lconvert)
+    add_subdirectory(../translations translations)
+else()
+    message(STATUS "Skipping adding translation custom targets due to missing lupdate or lconvert.")
+endif()