Tests/RunCMake/Codegen/no-codegen.cmake - third_party/github.com/Kitware/CMake - Git at Google

 add_custom_command(
   OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/generated.hpp
   COMMAND ${CMAKE_COMMAND} -E copy
     ${CMAKE_CURRENT_SOURCE_DIR}/generated.h.in
     ${CMAKE_CURRENT_BINARY_DIR}/generated.hpp
 )
	add_custom_command(
	OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/generated.hpp
	COMMAND ${CMAKE_COMMAND} -E copy
	${CMAKE_CURRENT_SOURCE_DIR}/generated.h.in
	${CMAKE_CURRENT_BINARY_DIR}/generated.hpp
	)