CMake: Create CMake files for WaylandClient

Also add unit tests

Change-Id: I66de887607f73b318884e4a35f18510b90cf0315
Task-number: QTBUG-47357
Reviewed-by: Jan Arne Petersen <jan.petersen@kdab.com>
Reviewed-by: Giulio Camuffo <giulio.camuffo@jollamobile.com>

src/client/client.pro

@@ -16,7 +16,6 @@ load(qt_module)
 QMAKE_CXXFLAGS_WARN_ON -= -Wcast-qual
 
 CONFIG -= precompile_header
-CONFIG -= create_cmake
 CONFIG += link_pkgconfig qpa/genericunixfontdatabase wayland-scanner
 
 !equals(QT_WAYLAND_GL_CONFIG, nogl) {

tests/auto/cmake/CMakeLists.txt

@@ -13,3 +13,6 @@ include("${_Qt5CTestMacros}")
 test_module_includes(
   Compositor QWaylandBufferRef
 )
+
+# Can't test in `test_module_includes`, WaylandClient has no public headers
+expect_pass(test_waylandclient)

tests/auto/cmake/test_waylandclient/CMakeLists.txt

+project(test_plugins)
+
+cmake_minimum_required(VERSION 2.8)
+cmake_policy(SET CMP0056 NEW)
+
+find_package(Qt5WaylandClient REQUIRED)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt5Core_EXECUTABLE_COMPILE_FLAGS}")
+
+include_directories(${Qt5WaylandClient_PRIVATE_INCLUDE_DIRS})
+add_executable(test_waylandclient_exe main.cpp)
+target_link_libraries(test_waylandclient_exe Qt5::WaylandClient)

tests/auto/cmake/test_waylandclient/main.cpp

+#include <private/qwaylandcursor_p.h>
+
+int main()
+{
+    // use symbol
+    QtWaylandClient::QWaylandCursor cursor(Q_NULLPTR);
+}