Tests/RunCMake/ExternalProject/countArgs.cmake - third_party/github.com/Kitware/CMake - Git at Google

 message(STATUS "Number of arguments for ${CMAKE_ARGV3}: ${CMAKE_ARGC}")
 math(EXPR last "${CMAKE_ARGC} - 1")
 foreach(n RANGE 4 ${last})
   message(STATUS "${CMAKE_ARGV3} argument ${n}: '${CMAKE_ARGV${n}}'")
 endforeach()
	message(STATUS "Number of arguments for ${CMAKE_ARGV3}: ${CMAKE_ARGC}")
	math(EXPR last "${CMAKE_ARGC} - 1")
	foreach(n RANGE 4 ${last})
	message(STATUS "${CMAKE_ARGV3} argument ${n}: '${CMAKE_ARGV${n}}'")
	endforeach()