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, 21 insertions, 27 deletions

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}"
+)