if (GIT_COMMIT)
	message(STATUS "GIT_COMMIT is set to ${GIT_COMMIT}")
else()
	set(GIT_COMMIT "unknown")

	find_program(GIT_EXECUTABLE git)

	if (GIT_EXECUTABLE)
		execute_process(COMMAND "${GIT_EXECUTABLE}" rev-parse --short=7 HEAD
			WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}
			RESULT_VARIABLE RET
			OUTPUT_VARIABLE COMMIT
			OUTPUT_STRIP_TRAILING_WHITESPACE)

		if (RET EQUAL 0)
			set(GIT_COMMIT "${COMMIT}")

			execute_process(COMMAND git status --porcelain
				WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR}
				RESULT_VARIABLE RET
				OUTPUT_VARIABLE GIT_UNSTAGED
				OUTPUT_STRIP_TRAILING_WHITESPACE)

			if(GIT_UNSTAGED OR RET)
				set(GIT_COMMIT "${GIT_COMMIT} (dirty)")
			endif()
		endif()
	endif()

	message(STATUS "You are currently on commit ${GIT_COMMIT}")
endif()

add_compile_definitions(GIT_COMMIT="${GIT_COMMIT}")