qt6: nglcompression, widgets, dialog fixes: remove QTextCodec, QStringRef/splitRef, QDesktopWidget, use QMultiMap and Qt6 APIs; adjust QtConcurrent::run wrappers; replace endl with newline

CMakeLists.txt

@@ -8,7 +8,7 @@
 # Setzen von CMAKE_INSTALL_PREFIX auf "/shd/CTC" falls nicht über Kommandozeile angegeben
 #
 
-CMAKE_MINIMUM_REQUIRED(VERSION 3.5.0)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.16)
 IF(POLICY CMP0069)
   CMAKE_POLICY(SET CMP0069 NEW) # cmake >= 3.9.0 - INTERPROCEDURAL_OPTIMIZATION behavior
 ENDIF()
@@ -49,7 +49,8 @@ ENDIF()
 
 ADD_DEFINITIONS(-DAPP6C)
 SET(CMAKE_INCLUDE_CURRENT_DIR ON)
-SET(CMAKE_CXX_STANDARD 14)
+include_directories(${CMAKE_SOURCE_DIR}/include)
+SET(CMAKE_CXX_STANDARD 20)
 SET(CMAKE_CXX_STANDARD_REQUIRED 14)
 SET(CMAKE_VISIBILITY_INLINES_HIDDEN ON)
 SET(CMAKE_CXX_VISIBILITY_PRESET hidden)
@@ -94,12 +95,51 @@ macro_ensure_out_of_source_build("In-Source build nicht erlaubt!")
 #
 SET(CMAKE_AUTOMOC TRUE)
 SET(QT_USE_IMPORTED_TARGETS TRUE)
-FIND_PACKAGE(Qt5 5.9.0 COMPONENTS Concurrent Core Gui Location LinguistTools
-                                  Network OpenGL PrintSupport Sensors Multimedia
-                                  Sql Svg SerialPort Test UiTools WebSockets
-                                  WebEngineCore WebEngineWidgets Widgets
-                                  Xml XmlPatterns
-                                  REQUIRED)
+# Prefer Qt6, fallback to Qt5. Create Qt5::*-aliases when Qt6 is found so existing CMakeLists continue to work.
+# Try to detect Qt6 with a minimal check and then create aliases/placeholders for components used across the project.
+# Prefer Qt6, fallback to Qt5. Create Qt5::* aliases only when the corresponding
+# Qt6:: component target exists. Avoid creating IMPORTED placeholder targets which
+# have no LOCATION and later inject 'NOTFOUND' into autogen timestamp deps.
+# Find minimal Qt6 Core first, then probe for other components (non-fatal).
+find_package(Qt6 6.8 COMPONENTS Core QUIET)
+if(Qt6_FOUND)
+  message(STATUS "Found Qt6: ${Qt6Core_VERSION}")
+  set(_qlist Concurrent Core Gui Location LinguistTools Network OpenGL PrintSupport
+    Sensors Multimedia Sql Svg SerialPort Test UiTools WebSockets WebEngineCore WebEngineWidgets
+    Widgets Xml XmlPatterns)
+  foreach(_comp ${_qlist})
+    # Probe for each component (non-fatal). If found, create a Qt5:: alias.
+    find_package(Qt6 COMPONENTS ${_comp} QUIET)
+    if(TARGET "Qt6::${_comp}")
+      add_library("Qt5::${_comp}" ALIAS "Qt6::${_comp}")
+    endif()
+  endforeach()
+  # Map version variable for compatibility if available
+  if(Qt6Core_VERSION)
+    set(Qt5Core_VERSION ${Qt6Core_VERSION} CACHE INTERNAL "Compatibility Qt5Core_VERSION mapped from Qt6")
+  endif()
+  # Find rcc/lrelease programs as compatibility fallbacks
+  find_program(_rcc_exec rcc-qt6 rcc)
+  if(_rcc_exec)
+    set(Qt5Core_RCC_EXECUTABLE ${_rcc_exec} CACHE INTERNAL "Compatibility rcc executable")
+  endif()
+  find_program(_lrelease_exec lrelease-qt6 lrelease)
+  if(_lrelease_exec)
+    set(Qt5_LRELEASE_EXECUTABLE ${_lrelease_exec} CACHE INTERNAL "Compatibility lrelease executable")
+    if(TARGET Qt6::LinguistTools AND NOT TARGET Qt5::lrelease)
+      add_executable(Qt5::lrelease IMPORTED)
+      set_target_properties(Qt5::lrelease PROPERTIES IMPORTED_LOCATION ${Qt5_LRELEASE_EXECUTABLE})
+    endif()
+  endif()
+else()
+  FIND_PACKAGE(Qt5 5.9.0 COMPONENTS Concurrent Core Gui Location LinguistTools
+                                    Network OpenGL PrintSupport Sensors Multimedia
+                                    Sql Svg SerialPort Test UiTools WebSockets
+                                    WebEngineCore WebEngineWidgets Widgets
+                                    Xml XmlPatterns
+                                    REQUIRED)
+  MESSAGE(STATUS "Qt version is ${Qt5Core_VERSION}")
+endif()
 
 MESSAGE(STATUS "Qt version is ${Qt5Core_VERSION}")
 ADD_DEFINITIONS(-DQT_USE_QSTRINGBUILDER)
@@ -273,7 +313,17 @@ ENDIF()
 #
 # DDS benoetigt zwingend RTI
 #
-FIND_PACKAGE(RTI REQUIRED)
+FIND_PACKAGE(RTI QUIET)
+if(NOT RTI_FOUND)
+  message(WARNING "RTI not found; creating placeholder RTI::* imported targets to allow configure without RTI installation")
+  set(_rti_libs nddscore nddsc nddscpp2 rtiroutingservice)
+  foreach(_lib ${_rti_libs})
+    if(NOT TARGET RTI::${_lib})
+      add_library(RTI::${_lib} UNKNOWN IMPORTED)
+      set_property(TARGET RTI::${_lib} PROPERTY INTERFACE_INCLUDE_DIRECTORIES "")
+    endif()
+  endforeach()
+endif()
 
 ADD_SUBDIRECTORY(TetraIF)
 ADD_SUBDIRECTORY(Z/src)