QT_NO_STANDARD_PROJECT_SETUP
防止后续对 qt_standard_project_setup() 的调用进行任何更改。
该变量自 Qt 6.3 起引入。
qt_standard_project_setup()命令通常在项目的顶级CMakeLists.txt 文件中调用。在某些情况下，此类项目可能会被纳入更大的项目层次结构中，作为子项目。 父项目可能希望阻止任何子项目对设置进行修改。父项目可以通过在通过add_subdirectory()、FetchContent_MakeAvailable() 或 CMake 提供的其他类似方法引入子项目之前，将QT_NO_STANDARD_PROJECT_SETUP 设置为TRUE 来实现这一点。
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