QT基础——qt6.2.4的cmake 流程

创建一个cmake工程

cmake_minimum_required(VERSION 3.16)

project(untitled VERSION 0.1 LANGUAGES CXX)

set(CMAKE_AUTOMOC ON)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Qt6 6.2 COMPONENTS Quick REQUIRED)

qt_add_executable(appuntitled
    main.cpp
)

qt_add_qml_module(appuntitled
    URI untitled
    VERSION 1.0
    QML_FILES main.qml 
)

set_target_properties(appuntitled PROPERTIES
    MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
    MACOSX_BUNDLE TRUE
    WIN32_EXECUTABLE TRUE
)

target_compile_definitions(appuntitled
    PRIVATE $<$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>:QT_QML_DEBUG>)
target_link_libraries(appuntitled
    PRIVATE Qt6::Quick)

qt_add_executable和qt_add_qml_module是qt定义的cmake函数，在qt安装目录能找到：

cmake 命令参考 ：https://doc-snapshots.qt.io/qt6-dev/cmake-command-reference.html

qt creator实际执行的构建命令：

修整一下：

cmake -Bbuild -GNinja "-DCMAKE_BUILD_TYPE:STRING=Debug" "-DCMAKE_PROJECT_INCLUDE_BEFORE:FILEPATH=C:/Qt/Tools/QtCreator/share/qtcreator/package-manager/auto-setup.cmake" "-DCMAKE_PREFIX_PATH:PATH=C:/Qt/6.2.4/mingw_64"

手动敲命令行

找个终端，执行之后就能得到cmake生成的文件

然后执行

ninja -C build

或者执行

cmake --build ./build --target all

都可以编译得到可执行文件

比较重要的是这两条

"-DCMAKE_PROJECT_INCLUDE_BEFORE:FILEPATH=C:/Qt/Tools/QtCreator/share/qtcreator/package-manager/auto-setup.cmake" 
"-DCMAKE_PREFIX_PATH:PATH=C:/Qt/6.2.4/mingw_64

CMAKE_PROJECT_INCLUDE_BEFORE

这个是用来管理第三方的依赖库的，参考 https://www.qt.io/blog/qt-creator-cmake-package-manager-auto-setup
如果只是一个hello world工程，没有依赖其他任何库，那么这一行也可以省掉，只需要：

就可以编译成功

CMAKE_PREFIX_PATH

是设置find_package(Qt6 6.2 COMPONENTS Quick REQUIRED)的搜索路径，find_package会搜索CMAKE_PREFIX_PATH目录及其bin, lib, include子目录，找到Qt6Config.cmake然后就能链接Qt6 的Quick组件了
参考： https://cmake.org/cmake/help/latest/command/find_package.html

ninja执行的操作

其实也就是moc、rcc、uic等这些操作 https://www.cnblogs.com/feipeng8848/p/14492801.html

bye