Allow to build examples as standalone project

Create CMake config files which can be used from the very same CMake
project. These CMake config files simply do not create any targets,
controlled via the QT_NO_CREATE_TARGETS.

This patch also allows to build qtbase.git:examples as a standalone
project, against an already-built Qt.

Ran this:
  ag -s "QT " examples -l -0 | xargs -0 -n 1 .../util/cmake/pro2cmake.py --is-example

Task-number: QTBUG-74713
Change-Id: I44cce5a4048618b30f890c5b789592c227a8b47d
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

1 files changed, 29 insertions, 35 deletions

diff --git a/examples/widgets/graphicsview/chip/CMakeLists.txt b/examples/widgets/graphicsview/chip/CMakeLists.txt
index 566a8aae02..81f290be99 100644
--- a/examples/widgets/graphicsview/chip/CMakeLists.txt
+++ b/examples/widgets/graphicsview/chip/CMakeLists.txt
@@ -1,44 +1,38 @@
 # Generated from chip.pro.
 
-#####################################################################
-## chip Binary:
-#####################################################################
+cmake_minimum_required(VERSION 3.14)
+project(chip LANGUAGES CXX)
 
-add_qt_executable(chip
-    GUI
-    OUTPUT_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/graphicsview/chip"
-    INSTALL_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/graphicsview/chip"
-    SOURCES
-        chip.cpp chip.h
-        main.cpp
-        mainwindow.cpp mainwindow.h
-        view.cpp view.h
-    LIBRARIES
-        Qt::Widgets
-)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
-# Resources:
-add_qt_resource(chip "images" FILES
-    fileprint.png
-    qt4logo.png
-    rotateleft.png
-    rotateright.png
-    zoomin.png
-    zoomout.png)
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_AUTOUIC ON)
 
+set(INSTALL_EXAMPLEDIR "examples")
 
-## Scopes:
-#####################################################################
+find_package(Qt5 COMPONENTS Widgets)
+find_package(Qt5 COMPONENTS OpenGL) # special case
+find_package(Qt5 COMPONENTS PrintSupport) # special case
 
-extend_target(chip CONDITION TARGET Qt::PrintSupport
-    LIBRARIES
-        Qt::PrintSupport
+add_executable(chip WIN32 MACOSX_BUNDLE
+    chip.cpp chip.h
+    images.qrc
+    main.cpp
+    mainwindow.cpp mainwindow.h
+    view.cpp view.h
 )
-
-extend_target(chip CONDITION TARGET Qt::OpenGL
-    LIBRARIES
-        Qt::OpenGL
+target_link_libraries(chip PUBLIC
+    Qt::Widgets
+)
+if (TARGET Qt::OpenGL)
+    target_link_libraries(chip PUBLIC Qt::OpenGL)
+endif()
+if (TARGET Qt::PrintSupport)
+    target_link_libraries(chip PUBLIC Qt::PrintSupport)
+endif()
+
+install(TARGETS chip
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
 )
-
-#### Keys ignored in scope 4:.:chip.pro:build_all AND NOT build_pass:
-# CONFIG = "-build_all" "release"