New in version 3.13.

Whether to enable the Main Thread Checker option Pause on issues in the Diagnostics section of the generated Xcode scheme.

This property is initialized by the value of the variable CMAKE_XCODE_SCHEME_MAIN_THREAD_CHECKER_STOP if it is set when a target is created.

Please refer to the XCODE_GENERATE_SCHEME target property documentation to see all Xcode schema related properties.