Using -split-objs

Hello, The ghc users guide contains this helpful advice about split-objs.. "don't use it unless you know what you're doing!" OK, I admit I don't know what I'm doing. But despite this handicap I would like to use split-objs to build a library. I've already discovered it doesn't work with --make, so I guess I have to use a makefile. Are there any other gotchas waiting for me? Anything else I need to know? Thanks -- Adrian Hey