CMakeLists.txt

cmake_minimum_required(VERSION 3.5)

指定cmake最低版本

project(projectname VERSION 0.0.1 LANGUAGES CXX)

message("project_version: ${CMAKE_PROJECT_VERSION}")
message("project_version_major: ${PROJECT_VERSION_MAJOR}")
message("project_version_minor: ${PROJECT_VERSION_MINOR}")
message("project_version_path: ${PROJECT_VERSION_PATCH}")

project()里面指定了工程名,程序版本号和程序使用的语言

if(CMAKE_VERSION VERSION_LESS "3.7.0")
    set(CMAKE_INCLUDE_CURRENT_DIR ON)
endif()

set(CMAKE_AUTOUIC ON)

使用Qt的uic.exe 把.ui文件转化为 ui_文件名.h文件

set(CMAKE_AUTOMOC ON)

使用Qt的moc.exe 把qt扩展的c++语法编译成标准c++代码(如: Q_OBJECT)

set(CMAKE_AUTORCC ON)

使用Qt的rcc.exe 把.qrc文件转为 qrc_文件名.cpp文件

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

指定C++版本,Qt6的至少需要 C++ 17版本

find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets)

(兼容Qt5和6的CMake编译),给${QT_VERSION_MAJOR}赋值
如果明确Qt使用版本可以简单的编写 find_package(Qt5 REQUIRED COMPONENTS Widgets)

set(PROJECT_SOURCES
        main.cpp
        MainWindow.cpp
        MainWindow.h
        MainWindow.ui
)

将需要进行编译的文件名字赋值给${PROJECT_SOURCES}

if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    qt_add_executable(${PROJECT_NAME}
        MANUAL_FINALIZATION
        ${PROJECT_SOURCES}
    )
else()
    add_executable(${PROJECT_NAME} ${PROJECT_SOURCES})
endif()

target_link_libraries(${CMAKE_PROJECT_NAME} PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)

引用Qt5Widgets.lib, 如果需要引用其他lib,如Websocket,
find_package(Qt5 REQUIRED COMPONENTS Widgets Websockets)

target_link_libraries(${CMAKE_PROJECT_NAME} PRIVATE Qt5::Widgets Qt5::Websockets)

第一个字母大写,兼容(Qt5,6写法) Qt${QT_VERSION_MAJOR}::Websockets

set_target_properties(${CMAKE_PROJECT_NAME} PROPERTIES
    WIN32_EXECUTABLE TRUE
)

install(TARGETS ${PROJECT_NAME}
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})

设置库的安装路径,具体请看CMake文档

安装命令: cmake --install <dir>

if(QT_VERSION_MAJOR EQUAL 6)
    qt_finalize_executable(untitled29)
endif()

注意

${PROJECT_NAME}和${CMAKE_PROJECT_NAME}都是表示工程名称,会有点区别