I'm looking for opinions as to the best way to do a C (or C++) foreign interface to GHC haskell code. It looks like there are three options. Greencard has been around for a while, but it looks as if it's more-or-less deprecated now; I don't see many people talking about it anymore. Unless I'm wrong about this (and if I am, please disabuse me of this bias), it doesn't sound like the obvious choice. That leaves me with GHC's FFI and hdirect. I've played around a bit with hdirect in ghc-5.02 and it works. I haven't really looked at the native FFI (beyond reading some manual pages), so I'm not really sure what hdirect provides that the FFI doesn't. From a cursory glance it looks like hdirect's ihc is useful for auto-generating interface files, but it may be over-kill for my smallish project. Any feedback or personal biases are welcomed. Thanks, --Mark