another-take…

AkantuBuildOptions.cmake
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			find_package(Git)
			find_program(UUENCODE_EXECUTABLE uuencode)

			function(git_version_info TARGET_NAME)
			cmake_parse_arguments(_gvi
			"ALL"
			"OUTPUT_FILE"
			"SOURCES"
			${ARGN})

			if(NOT _gvi_SOURCES)
			execute_process(
			COMMAND ${GIT_EXECUTABLE} ls-files --full-name
			WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
			OUTPUT_STRIP_TRAILING_WHITESPACE
			OUTPUT_VARIABLE __git_files)

			string(REPLACE "\n" ";" __git_files "${__git_files}")
			foreach(_item IN LISTS __git_files)
			get_filename_component(_abs_item "${_item}" ABSOLUTE
			BASE_DIR "${PROJECT_SOURCE_DIR}")
			if(EXISTS "${_abs_item}" AND
			NOT IS_DIRECTORY "${_abs_item}" AND
			NOT IS_SYMLINK "${_abs_item}")
			list(APPEND _gvi_SOURCES "${_abs_item}")
			endif()
			endforeach()
			endif()
			if(_gvi_OUTPUT_FILE)
			set(OUTPUT_FILE "${_gvi_OUTPUT_FILE}")
			else()
			set(OUTPUT_FILE "${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME}.hh")
			endif()

			configure_file(
			${PROJECT_SOURCE_DIR}/cmake/source_informations.sh.in
			${CMAKE_CURRENT_BINARY_DIR}/source_informations.sh
			@ONLY)

			set(__stamp_file ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME}.stamp)
			add_custom_command(
			VERBATIM
			OUTPUT ${__stamp_file}
			COMMAND ${CMAKE_CURRENT_BINARY_DIR}/source_informations.sh
			COMMAND ${CMAKE_COMMAND} -E touch ${__stamp_file}
			WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
			DEPENDS ${_gvi_SOURCES}
			COMMENT "Generating git version information for ${PROJECT_NAME}"
			)

			set_source_files_properties(${OUTPUT_FILE} PROPERTIES GENERATED TRUE)

			unset(_all)
			if(${_gvi_ALL})
			set(_all ALL)
			endif()

			add_custom_target(
			${TARGET_NAME} ${_all}
			DEPENDS ${__stamp_file}
			SOURCES ${_gvi_SOURCES}
			)
			endfunction()