I have some custom compilation script that uses GHC API The aim is to extract some info from every module in dependency graph and to write this information to the file lying near module-file. Script goes like this: main :: IO () main = do args <- getArgs defaultErrorHandler defaultDynFlags $ runGhc (Just libdir) $ do sdflags <- getSessionDynFlags (dflags, fileargs', _) <- parseDynamicFlags sdflags (map noLoc args) when (null fileargs') $ ghcError (UsageError "No input files.") _ <- setSessionDynFlags dflags let fileargs = map unLoc fileargs' targets <- mapM (\x -> guessTarget x Nothing) fileargs setTargets targets mgraph <- depanal [] False let files = filter (not . isSuffixOf "boot") . map (extractPath . ms_location) $ mgraph extractPath l = fromMaybe (ml_hi_file l) (ml_hs_file l) setTargets [] flip mapM_ files $ \file -> do core <- compileToCoreSimplified file HscTypes.liftIO $ let info = show (generateInfo core) fp = replaceExtension file ".info" putStrLn $ "Writing " ++ fp writeFile fp program The problem is processing base-4 package. I'd like to run something like: $ cd base-4.2.0.1 $ compiler -fglasgow-exts -cpp -package-name base -I./include Prelude.hs and to receive Prelude.info and .info files for every other modules that prelude depends on. At first I've got errors like missing .h file. I've downloaded GHC source distribution and get missing headers from GHC. But now I get errors like "trying to load Prelude module which is not loadable". I don't remember the exact text and I have no access to my developing-machine. I think it's caused by circular dependencies between modules. And I think my compilation script is not quite correct for this case. What do you think? -- Victor Nazarov