This doesn't seem to work (easily) for me. I want -Wall applied to all my source, so give it on the command line. Because the OPTIONS options get prepended, the -Wall seems to win out. :(. I could add -Wall at the top of all my source files, but that's unappealing. If GHC provided a way to have a command-line options appear before the OPTION options in the final list, that would work.

That's odd - it works here. OPTIONS pragmas are supposed to override the command line, and indeed in a small example I just tried I can override individual warnings in the OPTIONS pragmas with -Wall on the command line. Cheers, SImon