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>

6 files changed, 140 insertions, 127 deletions

diff --git a/examples/widgets/mainwindows/application/CMakeLists.txt b/examples/widgets/mainwindows/application/CMakeLists.txt
index 8a9bdea2c2..67ac4637ff 100644
--- a/examples/widgets/mainwindows/application/CMakeLists.txt
+++ b/examples/widgets/mainwindows/application/CMakeLists.txt
@@ -1,26 +1,28 @@
 # Generated from application.pro.
 
-#####################################################################
-## application Binary:
-#####################################################################
+cmake_minimum_required(VERSION 3.14)
+project(application LANGUAGES CXX)
 
-add_qt_executable(application
-    GUI
-    OUTPUT_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/application"
-    INSTALL_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/application"
-    SOURCES
-        main.cpp
-        mainwindow.cpp mainwindow.h
-    LIBRARIES
-        Qt::Widgets
-)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_AUTOUIC ON)
 
-# Resources:
-add_qt_resource(application "application" FILES
-    images/copy.png
-    images/cut.png
-    images/new.png
-    images/open.png
-    images/paste.png
-    images/save.png)
+set(INSTALL_EXAMPLEDIR "examples")
 
+find_package(Qt5 COMPONENTS Widgets)
+
+add_executable(application WIN32 MACOSX_BUNDLE
+    application.qrc
+    main.cpp
+    mainwindow.cpp mainwindow.h
+)
+target_link_libraries(application PUBLIC
+    Qt::Widgets
+)
+
+install(TARGETS application
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+)
diff --git a/examples/widgets/mainwindows/dockwidgets/CMakeLists.txt b/examples/widgets/mainwindows/dockwidgets/CMakeLists.txt
index e8fd580fd8..ceacc184da 100644
--- a/examples/widgets/mainwindows/dockwidgets/CMakeLists.txt
+++ b/examples/widgets/mainwindows/dockwidgets/CMakeLists.txt
@@ -1,32 +1,34 @@
 # Generated from dockwidgets.pro.
 
-#####################################################################
-## dockwidgets Binary:
-#####################################################################
+cmake_minimum_required(VERSION 3.14)
+project(dockwidgets LANGUAGES CXX)
 
-add_qt_executable(dockwidgets
-    GUI
-    OUTPUT_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/dockwidgets"
-    INSTALL_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/dockwidgets"
-    SOURCES
-        main.cpp
-        mainwindow.cpp mainwindow.h
-    LIBRARIES
-        Qt::Widgets
-)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_AUTOUIC ON)
 
-# Resources:
-add_qt_resource(dockwidgets "dockwidgets" FILES
-    images/new.png
-    images/print.png
-    images/save.png
-    images/undo.png)
+set(INSTALL_EXAMPLEDIR "examples")
 
+find_package(Qt5 COMPONENTS Widgets)
+find_package(Qt5 COMPONENTS PrintSupport) # special case
 
-## Scopes:
-#####################################################################
+add_executable(dockwidgets WIN32 MACOSX_BUNDLE
+    dockwidgets.qrc
+    main.cpp
+    mainwindow.cpp mainwindow.h
+)
+target_link_libraries(dockwidgets PUBLIC
+    Qt::Widgets
+)
+# special case begin
+if (TARGET Qt::PrintSupport)
+    target_link_libraries(dockwidgets PUBLIC Qt::PrintSupport)
+endif()
+# special case end
 
-extend_target(dockwidgets CONDITION TARGET Qt::PrintSupport
-    LIBRARIES
-        Qt::PrintSupport
+install(TARGETS dockwidgets
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
 )
diff --git a/examples/widgets/mainwindows/mainwindow/CMakeLists.txt b/examples/widgets/mainwindows/mainwindow/CMakeLists.txt
index df1d9b6355..5af2a7ffe9 100644
--- a/examples/widgets/mainwindows/mainwindow/CMakeLists.txt
+++ b/examples/widgets/mainwindows/mainwindow/CMakeLists.txt
@@ -1,35 +1,29 @@
 # Generated from mainwindow.pro.
 
-#####################################################################
-## mainwindow Binary:
-#####################################################################
+cmake_minimum_required(VERSION 3.14)
+project(mainwindow LANGUAGES CXX)
 
-add_qt_executable(mainwindow
-    GUI
-    OUTPUT_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/mainwindow"
-    INSTALL_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/mainwindow"
-    SOURCES
-        colorswatch.cpp colorswatch.h
-        main.cpp
-        mainwindow.cpp mainwindow.h
-        toolbar.cpp toolbar.h
-    LIBRARIES
-        Qt::Widgets
-)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
-# Resources:
-add_qt_resource(mainwindow "mainwindow" PREFIX "/res" FILES
-    qt.png
-    titlebarCenter.png
-    titlebarLeft.png
-    titlebarRight.png)
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_AUTOUIC ON)
 
+set(INSTALL_EXAMPLEDIR "examples")
 
-#### Keys ignored in scope 1:.:mainwindow.pro:<NONE>:
-# TEMPLATE = "app"
+find_package(Qt5 COMPONENTS Widgets)
 
-## Scopes:
-#####################################################################
+add_executable(mainwindow WIN32 MACOSX_BUNDLE
+    colorswatch.cpp colorswatch.h
+    main.cpp
+    mainwindow.cpp mainwindow.h mainwindow.qrc
+    toolbar.cpp toolbar.h
+)
+target_link_libraries(mainwindow PUBLIC
+    Qt::Widgets
+)
 
-#### Keys ignored in scope 2:.:mainwindow.pro:build_all AND NOT build_pass:
-# CONFIG = "-build_all" "release"
+install(TARGETS mainwindow
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+)
diff --git a/examples/widgets/mainwindows/mdi/CMakeLists.txt b/examples/widgets/mainwindows/mdi/CMakeLists.txt
index c20acbdfca..481e2477c1 100644
--- a/examples/widgets/mainwindows/mdi/CMakeLists.txt
+++ b/examples/widgets/mainwindows/mdi/CMakeLists.txt
@@ -1,27 +1,29 @@
 # Generated from mdi.pro.
 
-#####################################################################
-## mdi Binary:
-#####################################################################
+cmake_minimum_required(VERSION 3.14)
+project(mdi LANGUAGES CXX)
 
-add_qt_executable(mdi
-    GUI
-    OUTPUT_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/mdi"
-    INSTALL_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/mdi"
-    SOURCES
-        main.cpp
-        mainwindow.cpp mainwindow.h
-        mdichild.cpp mdichild.h
-    LIBRARIES
-        Qt::Widgets
-)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_AUTOUIC ON)
 
-# Resources:
-add_qt_resource(mdi "mdi" FILES
-    images/copy.png
-    images/cut.png
-    images/new.png
-    images/open.png
-    images/paste.png
-    images/save.png)
+set(INSTALL_EXAMPLEDIR "examples")
 
+find_package(Qt5 COMPONENTS Widgets)
+
+add_executable(mdi WIN32 MACOSX_BUNDLE
+    main.cpp
+    mainwindow.cpp mainwindow.h
+    mdi.qrc
+    mdichild.cpp mdichild.h
+)
+target_link_libraries(mdi PUBLIC
+    Qt::Widgets
+)
+
+install(TARGETS mdi
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+)
diff --git a/examples/widgets/mainwindows/menus/CMakeLists.txt b/examples/widgets/mainwindows/menus/CMakeLists.txt
index 6d7e471a8c..a10ef9090e 100644
--- a/examples/widgets/mainwindows/menus/CMakeLists.txt
+++ b/examples/widgets/mainwindows/menus/CMakeLists.txt
@@ -1,16 +1,27 @@
 # Generated from menus.pro.
 
-#####################################################################
-## menus Binary:
-#####################################################################
+cmake_minimum_required(VERSION 3.14)
+project(menus LANGUAGES CXX)
 
-add_qt_executable(menus
-    GUI
-    OUTPUT_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/menus"
-    INSTALL_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/menus"
-    SOURCES
-        main.cpp
-        mainwindow.cpp mainwindow.h
-    LIBRARIES
-        Qt::Widgets
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_AUTOUIC ON)
+
+set(INSTALL_EXAMPLEDIR "examples")
+
+find_package(Qt5 COMPONENTS Widgets)
+
+add_executable(menus WIN32 MACOSX_BUNDLE
+    main.cpp
+    mainwindow.cpp mainwindow.h
+)
+target_link_libraries(menus PUBLIC
+    Qt::Widgets
+)
+
+install(TARGETS menus
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
 )
diff --git a/examples/widgets/mainwindows/sdi/CMakeLists.txt b/examples/widgets/mainwindows/sdi/CMakeLists.txt
index 8391aa0cbc..81cb80f7a3 100644
--- a/examples/widgets/mainwindows/sdi/CMakeLists.txt
+++ b/examples/widgets/mainwindows/sdi/CMakeLists.txt
@@ -1,26 +1,28 @@
 # Generated from sdi.pro.
 
-#####################################################################
-## sdi Binary:
-#####################################################################
+cmake_minimum_required(VERSION 3.14)
+project(sdi LANGUAGES CXX)
 
-add_qt_executable(sdi
-    GUI
-    OUTPUT_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/sdi"
-    INSTALL_DIRECTORY "${INSTALL_EXAMPLESDIR}/widgets/mainwindows/sdi"
-    SOURCES
-        main.cpp
-        mainwindow.cpp mainwindow.h
-    LIBRARIES
-        Qt::Widgets
-)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_AUTOUIC ON)
 
-# Resources:
-add_qt_resource(sdi "sdi" FILES
-    images/copy.png
-    images/cut.png
-    images/new.png
-    images/open.png
-    images/paste.png
-    images/save.png)
+set(INSTALL_EXAMPLEDIR "examples")
 
+find_package(Qt5 COMPONENTS Widgets)
+
+add_executable(sdi WIN32 MACOSX_BUNDLE
+    main.cpp
+    mainwindow.cpp mainwindow.h
+    sdi.qrc
+)
+target_link_libraries(sdi PUBLIC
+    Qt::Widgets
+)
+
+install(TARGETS sdi
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+)