Tests/RunCMake/GeneratorExpressionShortCircuit/GoodOR.cmake - external/github.com/Kitware/CMake - Git at Google

 set(error $<0>)
 add_custom_target(check ALL COMMAND check
   $<OR:1,${error}>
   $<OR:0,1,${error}>
   $<OR:1,0,${error}>
 )
	set(error $<0>)
	add_custom_target(check ALL COMMAND check
	$<OR:1,${error}>
	$<OR:0,1,${error}>
	$<OR:1,0,${error}>
	)