Adapt build system for building against qt6

CMakeLists.txt

@@ -9,7 +9,7 @@ set (RELEASE_SERVICE_VERSION "${RELEASE_SERVICE_VERSION_MAJOR}.${RELEASE_SERVICE
 project(KSystemlog VERSION ${RELEASE_SERVICE_VERSION})
 
 set (QT_MIN_VERSION "5.15.0")
-set (KF5_MIN_VERSION "5.89.0")
+set (KF5_MIN_VERSION "5.90.0")
 
 find_package (ECM ${KF5_MIN_VERSION} REQUIRED NO_MODULE)
 set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH}  ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
@@ -33,7 +33,7 @@ kde_clang_format(${ALL_CLANG_FORMAT_SOURCE_FILES})
 ecm_setup_version(${RELEASE_SERVICE_VERSION} VARIABLE_PREFIX KSYSTEMLOG
                   VERSION_HEADER "${CMAKE_CURRENT_BINARY_DIR}/src/ksystemlog_version.h")
 
-find_package (Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
+find_package (Qt${QT_MAJOR_VERSION} ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
     Concurrent
     Core
     Network
@@ -41,6 +41,9 @@ find_package (Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
     Test
     PrintSupport
 )
+if (QT_MAJOR_VERSION STREQUAL "6")
+    find_package(Qt6Core5Compat)
+endif()
 
 find_package(KF5 ${KF5_MIN_VERSION} REQUIRED COMPONENTS
     XmlGui
@@ -102,8 +105,8 @@ if (${AUDIT_FOUND})
 endif (${AUDIT_FOUND})
 
 ########### Subfolders ##########
-add_definitions(-DQT_DISABLE_DEPRECATED_BEFORE=0x060000)
-add_definitions(-DKF_DISABLE_DEPRECATED_BEFORE_AND_AT=0x060000)
+add_definitions(-DQT_DISABLE_DEPRECATED_BEFORE=0x050f02)
+add_definitions(-DKF_DISABLE_DEPRECATED_BEFORE_AND_AT=0x055900)
 
 
 add_subdirectory(src)

autotests/CMakeLists.txt

@@ -14,7 +14,7 @@ include_directories(
 
 add_library(testCore STATIC testUtil.cpp testResources.qrc )
 target_link_libraries(testCore PUBLIC
-    Qt::Test
+    Qt${QT_MAJOR_VERSION}::Test
     ksystemlog_lib
     ksystemlog_base_mode
     ksystemlog_config

src/CMakeLists.txt

@@ -84,4 +84,4 @@ install(TARGETS ksystemlog ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
 
 install(PROGRAMS org.kde.ksystemlog.desktop DESTINATION ${KDE_INSTALL_APPDIR})
 install(FILES org.kde.ksystemlog.appdata.xml DESTINATION ${KDE_INSTALL_METAINFODIR})
-install(FILES ksystemlogui.rc DESTINATION ${KDE_INSTALL_KXMLGUI5DIR}/ksystemlog)
+install(FILES ksystemlogui.rc DESTINATION ${KDE_INSTALL_KXMLGUIDIR}/ksystemlog)

src/lib/CMakeLists.txt

@@ -50,8 +50,8 @@ add_dependencies(
 
 target_link_libraries(ksystemlog_lib
     ksystemlog_config
-    Qt::Widgets
-    Qt::PrintSupport
+    Qt${QT_MAJOR_VERSION}::Widgets
+    Qt${QT_MAJOR_VERSION}::PrintSupport
     KF5::I18n
     KF5::Archive
     KF5::WidgetsAddons

src/mainWindow.cpp

@@ -351,12 +351,23 @@ void MainWindow::changeResumePauseAction(bool paused)
     }
 
     // Be sure that the button will always have a good size
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     const auto associatedWidgets{mResumePauseAction->associatedWidgets()};
     for (QWidget *widget : associatedWidgets) {
         if (widget->sizeHint().width() > widget->size().width()) {
             widget->setMinimumSize(widget->sizeHint());
         }
     }
+#else
+    const auto associatedWidgets{mResumePauseAction->associatedObjects()};
+    for (QObject *obj : associatedWidgets) {
+        QWidget *widget = qobject_cast<QWidget *>(obj);
+
+        if (widget && (widget->sizeHint().width() > widget->size().width())) {
+            widget->setMinimumSize(widget->sizeHint());
+        }
+    }
+#endif
 }
 
 void MainWindow::fileOpen()