CMake: Make Network an optional package

To allow building only tools that don't depend on QtNetwork library
availability.

Guard building of Assistant and Designer when QtNetwork is not
available.

Show a warning when Assistant or Designer can't be built due to
QtNetwork missing.

Fixes: QTBUG-127513
Change-Id: I638286cdd17ce2aff2ce990e7642cebe04b9baf9
Reviewed-by:  Alexey Edelev <[email protected]>
(cherry picked from commit 8e9a402)
Reviewed-by: Qt Cherry-pick Bot <[email protected]>

Author: alcroito

CMakeLists.txt

@@ -18,9 +18,9 @@ if(WIN32)
     list(APPEND optional_components AxContainer)
 endif()
 
-find_package(Qt6 ${PROJECT_VERSION} CONFIG REQUIRED COMPONENTS BuildInternals Core Network)
+find_package(Qt6 ${PROJECT_VERSION} CONFIG REQUIRED COMPONENTS BuildInternals Core)
 find_package(Qt6 ${PROJECT_VERSION} QUIET CONFIG OPTIONAL_COMPONENTS
-             DBus Xml Widgets Quick QuickWidgets Qml QmlLSPrivate
+             DBus Network Xml Widgets Quick QuickWidgets Qml QmlLSPrivate
              Sql PrintSupport OpenGL OpenGLWidgets ${optional_components})
 qt_internal_project_setup()
 

configure.cmake

@@ -42,7 +42,7 @@ endif()
 qt_feature("assistant" PRIVATE
     LABEL "Qt Assistant"
     PURPOSE "Qt Assistant is a tool for viewing on-line documentation in Qt help file format."
-    CONDITION TARGET Qt::Widgets AND QT_FEATURE_png AND QT_FEATURE_pushbutton AND QT_FEATURE_toolbutton AND (sqlite_plugin_available OR QT_BUILD_SHARED_LIBS)
+    CONDITION TARGET Qt::Widgets AND TARGET Qt::Network AND QT_FEATURE_png AND QT_FEATURE_pushbutton AND QT_FEATURE_toolbutton AND (sqlite_plugin_available OR QT_BUILD_SHARED_LIBS)
 )
 qt_feature("clang" PRIVATE
     LABEL "libclang found"
@@ -64,7 +64,7 @@ qt_feature("clangcpp" PRIVATE
 qt_feature("designer" PRIVATE
     LABEL "Qt Widgets Designer"
     PURPOSE "Qt Widgets Designer is the Qt tool for designing and building graphical user interfaces (GUIs) with Qt Widgets. You can compose and customize your windows or dialogs in a what-you-see-is-what-you-get (WYSIWYG) manner, and test them using different styles and resolutions."
-    CONDITION TARGET Qt::Widgets AND QT_FEATURE_png AND QT_FEATURE_pushbutton AND QT_FEATURE_toolbutton
+    CONDITION TARGET Qt::Widgets AND TARGET Qt::Network AND QT_FEATURE_png AND QT_FEATURE_pushbutton AND QT_FEATURE_toolbutton
 )
 qt_feature("distancefieldgenerator" PRIVATE
     LABEL "Qt Distance Field Generator"
@@ -166,3 +166,15 @@ qt_configure_add_report_entry(
     MESSAGE "${clangcpp_warn_msg}"
     CONDITION NOT QT_FEATURE_clangcpp
 )
+
+qt_configure_add_report_entry(
+    TYPE WARNING
+    MESSAGE "Qt Assistant will not be compiled because it requires Qt Network."
+    CONDITION NOT QT_FEATURE_assistant AND NOT TARGET Qt::Network
+)
+
+qt_configure_add_report_entry(
+    TYPE WARNING
+    MESSAGE "Qt Designer will not be compiled because it requires Qt Network."
+    CONDITION NOT QT_FEATURE_designer AND NOT TARGET Qt::Network
+)