qt学习： cmake 替代 qmake 开发 qt 程序

参考资料：cmake.org/cmake/help/latest/manual/cmake-qt.7.html
1. 创建文件

$ mkdir qt_cmake
$ cd qt_cmake
$ touch hello.cpp
$ touch CMakeLists.txt

2. 文件内容
hello.cpp

#include <QApplication>
#include <QWidget>
#include <QGridLayout>
#include <QLabel>

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

    QApplication app(argc, argv);

    QWidget widget;
    widget.resize(640, 480);
    widget.setWindowTitle("Hello, world!!!");

    QGridLayout *gridLayout = new QGridLayout(&widget);

    QLabel * label = new QLabel("Hello, world!!!");
    label->setAlignment(Qt::AlignVCenter | Qt::AlignHCenter);
    gridLayout->addWidget(label);

    widget.show();

    return app.exec();
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.5)
project(hello)

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(Qt5 COMPONENTS Core Gui Widgets REQUIRED)



set (SRCS
CMakeLists.txt
hello.cpp
)


add_executable(${CMAKE_PROJECT_NAME} ${SRCS})

target_link_libraries(${CMAKE_PROJECT_NAME} PRIVATE Qt5::Core Qt5::Gui Qt5::Widgets)

3. 编译运行

$ mkdir build
$ cmake ..
$ make
$ ./hello

4. 运行效果

5. 问题
cmake 可能提示 “By not providing "FindQt5.cmake" in CMAKE_MODULE_PATH this project .....” 是 cmake 找不到 qt 安装位置，可以在通过在 cmake 配置生成阶段定义 CMAKE_PREFIX_PATH 解决

$ cmake .. -DCMAKE_PREFIX_PATH:STRING=/home/sunhx/Qt5.14.2/5.14.2/gcc_64
$ cmake --build .
$ ./hello