Qt Kit v5.15 Desktop Application with CMake: 'QApplication' file not found

Developer123

I created a new project on Qt Creator going to: File > New Project > Application (QT) > Qt Quick Application, and chose to use CMake. On main.cpp I put:

#include <QQmlApplicationEngine>
#include <QApplication>
#include <QQmlContext>

int main(int argc, char *argv[])
{
}

All includes work, except for #include <QApplication>. I tried adding find_package(Qt5Widgets), as explained here, but did not work:

#CmakeLists.txt
cmake_minimum_required(VERSION 3.14)

project(GMA2 VERSION 0.1 LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(QT NAMES Qt6 Qt5 COMPONENTS Core Quick REQUIRED)
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core Quick REQUIRED)
find_package(Qt5Widgets)

set(PROJECT_SOURCES
...

Chris Kawa

Do you want to make a QML or Widgets application? Qt Quick Application is a QML app, while QApplication is a widgets object. If you want QML don't use QApplication. If you want widgets add them in the components section i.e. find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core Gui Widgets REQUIRED).

mchinand

You also need to include the Qt modules to your target_link_libaries() statement:

target_link_libraries(${PROJECT_NAME} Qt5::Widgets)

See https://doc.qt.io/qt-5/cmake-get-started.html