Tests/RunCMake/file/COPY_FILE-output-missing.cmake - third_party/github.com/Kitware/CMake - Git at Google

 set(oldname "${CMAKE_CURRENT_BINARY_DIR}/input")
 set(newname "${CMAKE_CURRENT_BINARY_DIR}/output-missing/output")
 file(WRITE "${oldname}" "")
 file(COPY_FILE "${oldname}" "${newname}")
	set(oldname "${CMAKE_CURRENT_BINARY_DIR}/input")
	set(newname "${CMAKE_CURRENT_BINARY_DIR}/output-missing/output")
	file(WRITE "${oldname}" "")
	file(COPY_FILE "${oldname}" "${newname}")