refactor: option to use QTextCodec from Qt5compat

CMakeLists.txt

@@ -14,10 +14,16 @@ set(CMAKE_AUTORCC ON)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+option(USE_QTEXTCODEC "Use QTextCodec instead of QStringConverter, in case Qt is not built with ICU" OFF)
+
 find_package(Qt6 6.6 COMPONENTS Widgets Multimedia Network LinguistTools REQUIRED)
 find_package(KF6Codecs 6.1.0)
 find_package(PkgConfig)
 
+if (USE_QTEXTCODEC)
+    find_package(Qt6 6.6 COMPONENTS Core5Compat REQUIRED)
+endif()
+
 if (PKG_CONFIG_FOUND)
 pkg_check_modules(TagLib taglib IMPORTED_TARGET)
 endif ()
@@ -73,14 +79,18 @@ else ()
     target_link_libraries(${EXE_NAME} PRIVATE PkgConfig::TagLib)
 endif ()
 
-if (NOT TARGET KF6::Codecs)
-    target_compile_definitions(${EXE_NAME} PRIVATE NO_KCODECS=1)
-else ()
+if (TARGET KF6::Codecs)
+    target_compile_definitions(${EXE_NAME} PRIVATE HAVE_KCODECS=1)
     target_link_libraries (${EXE_NAME} PRIVATE KF6::Codecs)
 endif ()
 
 target_link_libraries(${EXE_NAME} PRIVATE Qt::Widgets Qt::Multimedia Qt::Network)
 
+if (USE_QTEXTCODEC)
+    target_compile_definitions(${EXE_NAME} PRIVATE USE_QTEXTCODEC=1)
+    target_link_libraries(${EXE_NAME} PRIVATE Qt6::Core5Compat)
+endif()
+
 # Install settings
 if (WIN32)
     # FIXME: try to avoid install to a "bin" subfolder under windows...