Specify a launcher for custom rules.
Makefile Generators and the Ninja generator prefix custom commands with the given launcher command line. This is intended to allow launchers to intercept build problems with high granularity. Other generators ignore this property because their underlying build systems provide no hook to wrap individual commands with a launcher.
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https://cmake.org/cmake/help/v3.19/prop_gbl/RULE_LAUNCH_CUSTOM.html