ANDROID_GUI
Build an executable as an application package on Android.
When this property is set to true the executable when built for Android will be created as an application package. This property is initialized by the value of the CMAKE_ANDROID_GUI variable if it is set when a target is created.
Add the AndroidManifest.xml source file explicitly to the target add_executable() command invocation to specify the root directory of the application package source.
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https://cmake.org/cmake/help/v3.5/prop_tgt/ANDROID_GUI.html