CMake: Fix examples that use 'shared' project when using a static Qt

When using a static Qt, linking of examples that use the 'shared' Qml
module would fail with the following error

Undefined symbols for architecture x86_64:
  "qt_static_plugin_sharedPlugin()", referenced from:
  StaticsharedPluginPluginInstance::StaticsharedPluginPluginInstance()
  in window_shared_init.cpp.o

This happened because the 'shared' project pre-created its
plugin target with qt_add_library instead of qt_add_plugin.

qt_add_plugin passes an additional QT_STATICPLUGIN compile definition
when compiling the moc'ed file to ensure that the QT_MOC_EXPORT_PLUGIN
macro creates a qt_plugin_instance_PLUGIN_NAME symbol.

Unfortunately we can't use qt_add_plugin for shared Qt builds, because
some of the projects link directly against the plugin target and it's
not possible to link against a MODULE_LIBRARY target which
qt_add_plugin creates in shared Qt build.

We could try to conditionally switch between using qt_add_library for
a shared Qt build and qt_add_plugin for a static Qt build, but that
further complicates the build system code because it requires
specifying a class name and plugin type explicitly.

Remove the direct linkage against the libraries in the examples and
instead rely on plugin loading.
This simplifies the logic of not having to pre-create a target.

Amends 7b6eea37aeea55cdf1bcb1fd9c3091d6753f95e8

Fixes: QTBUG-96805
Change-Id: I5b2f3992ccda29b59f1e99748005381c73daca69
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
(cherry picked from commit edc4357ae4893dd952ce1c07b180b4b334047606)
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

9 files changed, 8 insertions, 10 deletions

diff --git a/examples/quick/animation/CMakeLists.txt b/examples/quick/animation/CMakeLists.txt
index 2d565c24f9..29c6e184e0 100644
--- a/examples/quick/animation/CMakeLists.txt
+++ b/examples/quick/animation/CMakeLists.txt
@@ -34,8 +34,8 @@ target_link_libraries(animationexample PUBLIC
     Qt::Gui
     Qt::Qml
     Qt::Quick
-    animation_shared
 )
+add_dependencies(animationexample animation_shared)
 
 qt_add_qml_module(animationexample
     URI animation
diff --git a/examples/quick/delegatechooser/CMakeLists.txt b/examples/quick/delegatechooser/CMakeLists.txt
index 1ceecc4736..1c6abcff47 100644
--- a/examples/quick/delegatechooser/CMakeLists.txt
+++ b/examples/quick/delegatechooser/CMakeLists.txt
@@ -26,8 +26,8 @@ target_link_libraries(delegatechooserexample PUBLIC
     Qt::Gui
     Qt::Qml
     Qt::Quick
-    delegatechooser_shared
 )
+add_dependencies(delegatechooserexample delegatechooser_shared)
 
 qt_add_qml_module(delegatechooserexample
     URI delegatechooser
diff --git a/examples/quick/shapes/CMakeLists.txt b/examples/quick/shapes/CMakeLists.txt
index ce83fd32cc..04d00776e6 100644
--- a/examples/quick/shapes/CMakeLists.txt
+++ b/examples/quick/shapes/CMakeLists.txt
@@ -34,8 +34,8 @@ target_link_libraries(shapesexample PUBLIC
     Qt::Gui
     Qt::Qml
     Qt::Quick
-    shapes_shared
 )
+add_dependencies(shapesexample delegatechooser_shared)
 
 qt_add_qml_module(shapesexample
     URI shapes
diff --git a/examples/quick/shared/CMakeLists.txt b/examples/quick/shared/CMakeLists.txt
index 5d23f0d16a..6d93a10010 100644
--- a/examples/quick/shared/CMakeLists.txt
+++ b/examples/quick/shared/CMakeLists.txt
@@ -1,5 +1,3 @@
-qt_add_library(${PROJECT_NAME}_shared)
-
 set_source_files_properties(CheckBox.qml TabSet.qml TextField.qml
     PROPERTIES
         QT_QML_SOURCE_VERSIONS 2.1
diff --git a/examples/quick/text/CMakeLists.txt b/examples/quick/text/CMakeLists.txt
index 8e697cd6c2..e2fa455b8b 100644
--- a/examples/quick/text/CMakeLists.txt
+++ b/examples/quick/text/CMakeLists.txt
@@ -34,8 +34,8 @@ target_link_libraries(textexample PUBLIC
     Qt::Gui
     Qt::Qml
     Qt::Quick
-    text_shared
 )
+add_dependencies(textexample text_shared)
 
 qt_add_qml_module(textexample
     URI text
diff --git a/examples/quick/threading/CMakeLists.txt b/examples/quick/threading/CMakeLists.txt
index 86e17ac1b3..eb08dbe612 100644
--- a/examples/quick/threading/CMakeLists.txt
+++ b/examples/quick/threading/CMakeLists.txt
@@ -34,8 +34,8 @@ target_link_libraries(threadingexample PUBLIC
     Qt::Gui
     Qt::Qml
     Qt::Quick
-    threading_shared
 )
+add_dependencies(threadingexample threading_shared)
 
 qt_add_qml_module(threadingexample
     URI threading
diff --git a/examples/quick/touchinteraction/CMakeLists.txt b/examples/quick/touchinteraction/CMakeLists.txt
index 5f7b0693ac..f2856b7f6e 100644
--- a/examples/quick/touchinteraction/CMakeLists.txt
+++ b/examples/quick/touchinteraction/CMakeLists.txt
@@ -34,8 +34,8 @@ target_link_libraries(touchinteractionexample PUBLIC
     Qt::Gui
     Qt::Qml
     Qt::Quick
-    touchinteraction_shared
 )
+add_dependencies(touchinteractionexample touchinteraction_shared)
 
 qt_add_qml_module(touchinteractionexample
     URI touchinteraction
diff --git a/examples/quick/views/CMakeLists.txt b/examples/quick/views/CMakeLists.txt
index ca02f8d86e..59df78d940 100644
--- a/examples/quick/views/CMakeLists.txt
+++ b/examples/quick/views/CMakeLists.txt
@@ -34,8 +34,8 @@ target_link_libraries(viewsexample PRIVATE
     Qt::Gui
     Qt::Qml
     Qt::Quick
-    views_shared
 )
+add_dependencies(viewsexample views_shared)
 
 qt_add_qml_module(viewsexample
     URI views
diff --git a/examples/quick/window/CMakeLists.txt b/examples/quick/window/CMakeLists.txt
index b8e81ff5c2..f8a9f45600 100644
--- a/examples/quick/window/CMakeLists.txt
+++ b/examples/quick/window/CMakeLists.txt
@@ -45,8 +45,8 @@ target_link_libraries(windowexample PRIVATE
     Qt::Gui
     Qt::Qml
     Qt::Quick
-    window_shared
 )
+add_dependencies(windowexample window_shared)
 
 install(TARGETS windowexample
     RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"