New in version 3.3.
This variable is only used when CMAKE_CROSSCOMPILING is on. It should point to a command on the host system that can run executable built for the target system.
If this variable contains a semicolon-separated list, then the first value is the command and remaining values are its arguments.
The command will be used to run try_run() generated executables, which avoids manual population of the TryRunResults.cmake file.
It is also used as the default value for the CROSSCOMPILING_EMULATOR target property of executables.
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https://cmake.org/cmake/help/v3.19/variable/CMAKE_CROSSCOMPILING_EMULATOR.html