VS_IOT_STARTUP_TASK

From Get docs
Cmake/docs/3.21/prop tgt/vs iot startup task


VS_IOT_STARTUP_TASK

New in version 3.4.


Visual Studio Windows 10 IoT Continuous Background Task

Specifies that the target should be compiled as a Continuous Background Task library.

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https://cmake.org/cmake/help/v3.21/prop_tgt/VS_IOT_STARTUP_TASK.html