X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fmain%2FMain.hs;h=8d156dba92fc07b2ed3b1ffee8bb13a73022a3e9;hb=c0eed017436c7d36dd163547ea95d3f8b36645d4;hp=29039de23f683420ff41a77c5664056134ddf168;hpb=daa4b9df3272f619be17687ab56057ab63060b8c;p=ghc-hetmet.git diff --git a/ghc/compiler/main/Main.hs b/ghc/compiler/main/Main.hs index 29039de..8d156db 100644 --- a/ghc/compiler/main/Main.hs +++ b/ghc/compiler/main/Main.hs @@ -1,68 +1,45 @@ {-# OPTIONS -fno-warn-incomplete-patterns -optc-DNON_POSIX_SOURCE #-} - ----------------------------------------------------------------------------- --- $Id: Main.hs,v 1.129 2003/07/16 13:33:55 simonmar Exp $ -- -- GHC Driver program -- --- (c) The University of Glasgow 2002 +-- (c) The University of Glasgow 2005 -- ----------------------------------------------------------------------------- --- with path so that ghc -M can find config.h -#include "../includes/config.h" - module Main (main) where #include "HsVersions.h" - #ifdef GHCI -import InteractiveUI( ghciWelcomeMsg, interactiveUI ) +import InteractiveUI ( ghciWelcomeMsg, interactiveUI ) #endif +import MkIface ( showIface ) import CompManager ( cmInit, cmLoadModules, cmDepAnal ) -import HscTypes ( GhciMode(..) ) -import Config ( cBooterVersion, cGhcUnregisterised, cProjectVersion ) -import SysTools ( getPackageConfigPath, initSysTools, cleanTempFiles, - normalisePath ) -import Packages ( showPackages, getPackageConfigMap, basePackage, - haskell98Package - ) -import DriverPipeline ( staticLink, doMkDLL, runPipeline ) -import DriverState ( buildCoreToDo, buildStgToDo, - findBuildTag, - getPackageExtraGhcOpts, unregFlags, - v_GhcMode, v_GhcModeFlag, GhcMode(..), - v_Keep_tmp_files, v_Ld_inputs, v_Ways, - v_OptLevel, v_Output_file, v_Output_hi, - readPackageConf, verifyOutputFiles, v_NoLink, - v_Build_tag - ) -import DriverFlags ( buildStaticHscOpts, - dynamic_flags, processArgs, static_flags) - -import DriverMkDepend ( beginMkDependHS, endMkDependHS ) -import DriverPhases ( isSourceFile ) - -import DriverUtil ( add, handle, handleDyn, later, unknownFlagsErr ) -import CmdLineOpts ( dynFlag, restoreDynFlags, - saveDynFlags, setDynFlags, getDynFlags, dynFlag, - DynFlags(..), HscLang(..), v_Static_hsc_opts - ) +import Config +import SysTools +import Packages ( dumpPackages, initPackages, haskell98PackageId, + PackageIdH(..) ) +import DriverPipeline ( runPipeline, staticLink, doMkDLL ) + +import DriverMkDepend ( doMkDependHS ) +import DriverPhases ( Phase(..), isStopLn, isSourceFilename, anyHsc ) + +import DynFlags +import StaticFlags ( parseStaticFlags, staticFlags, v_Ld_inputs ) +import CmdLineParser import BasicTypes ( failed ) -import Outputable import Util -import Panic ( GhcException(..), panic, installSignalHandlers ) +import Panic -import DATA_IOREF ( readIORef, writeIORef ) +-- Standard Haskell libraries import EXCEPTION ( throwDyn, Exception(..), AsyncException(StackOverflow) ) --- Standard Haskell libraries import IO -import Directory ( doesFileExist ) +import Directory ( doesFileExist, doesDirectoryExist ) import System ( getArgs, exitWith, ExitCode(..) ) import Monad import List @@ -71,27 +48,19 @@ import Maybe ----------------------------------------------------------------------------- -- ToDo: --- new mkdependHS doesn't support all the options that the old one did (-X et al.) -- time commands when run with -v --- split marker --- java generation -- user ways -- Win32 support: proper signal handling --- make sure OPTIONS in .hs file propogate to .hc file if -C or -keep-hc-file-too -- reading the package configuration file is too slow -- -K ----------------------------------------------------------------------------- --- Differences vs. old driver: - --- No more "Enter your Haskell program, end with ^D (on a line of its own):" --- consistency checking removed (may do this properly later) --- no -Ofile - ------------------------------------------------------------------------------ -- Main loop main = + --------------------------------------- + -- exception handlers + -- top-level exception handler: any unrecognised exception is a compiler bug. handle (\exception -> do hFlush stdout @@ -99,8 +68,7 @@ main = -- an IO exception probably isn't our fault, so don't panic IOException _ -> hPutStrLn stderr (show exception) AsyncException StackOverflow -> - hPutStrLn stderr "stack overflow: use +RTS -K \ - \to increase it" + hPutStrLn stderr "stack overflow: use +RTS -K to increase it" _other -> hPutStr stderr (show (Panic (show exception))) exitWith (ExitFailure 1) ) $ do @@ -115,87 +83,67 @@ main = exitWith (ExitFailure 1) ) $ do - -- make sure we clean up after ourselves - later (do forget_it <- readIORef v_Keep_tmp_files - unless forget_it $ do - verb <- dynFlag verbosity - cleanTempFiles verb - ) $ do - -- exceptions will be blocked while we clean the temporary files, - -- so there shouldn't be any difficulty if we receive further - -- signals. - installSignalHandlers - argv <- getArgs - let (minusB_args, argv') = partition (prefixMatch "-B") argv - top_dir <- initSysTools minusB_args - - -- Read the package configuration - conf_file <- getPackageConfigPath - readPackageConf conf_file - - -- Process all the other arguments, and get the source files - non_static <- processArgs static_flags argv' [] - mode <- readIORef v_GhcMode - - -- -O and --interactive are not a good combination - -- ditto with any kind of way selection - orig_opt_level <- readIORef v_OptLevel - when (orig_opt_level > 0 && mode == DoInteractive) $ - do putStr "warning: -O conflicts with --interactive; -O turned off.\n" - writeIORef v_OptLevel 0 - orig_ways <- readIORef v_Ways - when (notNull orig_ways && mode == DoInteractive) $ - do throwDyn (UsageError - "--interactive can't be used with -prof, -ticky, -unreg or -smp.") + ---------------------------------------- + -- command-line parsing + argv0 <- getArgs + + -- 1. we grab the -B option if there is one + let (minusB_args, argv1) = partition (prefixMatch "-B") argv0 + dflags0 <- initSysTools minusB_args defaultDynFlags + + -- 2. Parse the "mode" flags (--make, --interactive etc.) + (cli_mode, argv2) <- parseModeFlags argv1 + + -- 3. Parse the static flags + argv3 <- parseStaticFlags argv2 - -- Find the build tag, and re-process the build-specific options. - -- Also add in flags for unregisterised compilation, if - -- GhcUnregisterised=YES. - way_opts <- findBuildTag - let unreg_opts | cGhcUnregisterised == "YES" = unregFlags - | otherwise = [] - pkg_extra_opts <- getPackageExtraGhcOpts - extra_non_static <- processArgs static_flags - (unreg_opts ++ way_opts ++ pkg_extra_opts) [] - - -- Give the static flags to hsc - static_opts <- buildStaticHscOpts - writeIORef v_Static_hsc_opts static_opts - - -- build the default DynFlags (these may be adjusted on a per - -- module basis by OPTIONS pragmas and settings in the interpreter). - - core_todo <- buildCoreToDo - stg_todo <- buildStgToDo - - -- set the "global" HscLang. The HscLang can be further adjusted on a module - -- by module basis, using only the -fvia-C and -fasm flags. If the global - -- HscLang is not HscC or HscAsm, -fvia-C and -fasm have no effect. - dyn_flags <- getDynFlags - build_tag <- readIORef v_Build_tag - let lang = case mode of + -- 4. Parse the dynamic flags + dflags1 <- initDynFlags dflags0 + + -- set the default HscTarget. The HscTarget can be further + -- adjusted on a module by module basis, using only the -fvia-C and + -- -fasm flags. If the default HscTarget is not HscC or HscAsm, + -- -fvia-C and -fasm have no effect. + let lang = case cli_mode of DoInteractive -> HscInterpreted - _other | build_tag /= "" -> HscC - | otherwise -> hscLang dyn_flags - -- for ways other that the normal way, we must - -- compile via C. - - setDynFlags (dyn_flags{ coreToDo = core_todo, - stgToDo = stg_todo, - hscLang = lang, - -- leave out hscOutName for now - hscOutName = panic "Main.main:hscOutName not set", - verbosity = 1 - }) + DoEval _ -> HscInterpreted + _other -> hscTarget dflags1 + + let mode = case cli_mode of + DoInteractive -> Interactive + DoEval _ -> Interactive + DoMake -> BatchCompile + DoMkDependHS -> MkDepend + _ -> OneShot + + let dflags2 = dflags1{ ghcMode = mode, + hscTarget = lang, + -- leave out hscOutName for now + hscOutName = panic "Main.main:hscOutName not set", + verbosity = case cli_mode of + DoEval _ -> 0 + _other -> 1 + } -- The rest of the arguments are "dynamic" -- Leftover ones are presumably files - fileish_args <- processArgs dynamic_flags (extra_non_static ++ non_static) [] + (dflags3, fileish_args) <- parseDynamicFlags dflags2 argv3 + + -- make sure we clean up after ourselves + later (unless (dopt Opt_KeepTmpFiles dflags3) $ + cleanTempFiles dflags3) $ do + -- exceptions will be blocked while we clean the temporary files, + -- so there shouldn't be any difficulty if we receive further + -- signals. - -- save the "initial DynFlags" away - saveDynFlags + -- Display banner + showBanner cli_mode dflags3 + + -- Read the package config(s), and process the package-related + -- command-line flags + dflags <- initPackages dflags3 let {- @@ -215,7 +163,7 @@ main = Everything else is considered to be a linker object, and passed straight through to the linker. -} - looks_like_an_input m = isSourceFile m + looks_like_an_input m = isSourceFilename m || looksLikeModuleName m || '.' `notElem` m @@ -225,140 +173,321 @@ main = normal_fileish_paths = map normalisePath fileish_args (srcs, objs) = partition looks_like_an_input normal_fileish_paths - mapM_ (add v_Ld_inputs) objs + -- Note: have v_Ld_inputs maintain the order in which 'objs' occurred on + -- the command-line. + mapM_ (consIORef v_Ld_inputs) (reverse objs) - ---------------- Display banners and configuration ----------- - showBanners mode conf_file static_opts + ---------------- Display configuration ----------- + when (verbosity dflags >= 4) $ + dumpPackages dflags - ---------------- Final sanity checking ----------- - checkOptions mode srcs objs + when (verbosity dflags >= 3) $ do + hPutStrLn stderr ("Hsc static flags: " ++ unwords staticFlags) - -- We always link in the base package in - -- one-shot linking. Any other packages - -- required must be given using -package - -- options on the command-line. - let def_hs_pkgs = [basePackage, haskell98Package] + ---------------- Final sanity checking ----------- + checkOptions cli_mode dflags srcs objs ---------------- Do the business ----------- - case mode of - DoMake -> doMake srcs - - DoMkDependHS -> do { beginMkDependHS ; - compileFiles mode srcs; - endMkDependHS } - StopBefore p -> do { compileFiles mode srcs; return () } - DoMkDLL -> do { o_files <- compileFiles mode srcs; - doMkDLL o_files def_hs_pkgs } - DoLink -> do { o_files <- compileFiles mode srcs; - omit_linking <- readIORef v_NoLink; - when (not omit_linking) - (staticLink o_files def_hs_pkgs) } + case cli_mode of + ShowUsage -> showGhcUsage cli_mode + PrintLibdir -> do d <- getTopDir; putStrLn d + ShowVersion -> showVersion + ShowNumVersion -> putStrLn cProjectVersion + ShowInterface f -> showIface f + DoMake -> doMake dflags srcs + DoMkDependHS -> doMkDependHS dflags srcs + StopBefore p -> oneShot dflags p srcs + DoInteractive -> interactiveUI dflags srcs Nothing + DoEval expr -> interactiveUI dflags srcs (Just expr) + + exitWith ExitSuccess #ifndef GHCI - DoInteractive -> throwDyn (CmdLineError "not built for interactive use") -#else - DoInteractive -> interactiveUI srcs +interactiveUI _ _ _ = + throwDyn (CmdLineError "not built for interactive use") #endif + -- ----------------------------------------------------------------------------- -- Option sanity checks -checkOptions :: GhcMode -> [String] -> [String] -> IO () +checkOptions :: CmdLineMode -> DynFlags -> [String] -> [String] -> IO () -- Final sanity checking before kicking off a compilation (pipeline). -checkOptions mode srcs objs = do +checkOptions cli_mode dflags srcs objs = do + -- Complain about any unknown flags + let unknown_opts = [ f | f@('-':_) <- srcs ] + when (notNull unknown_opts) (unknownFlagsErr unknown_opts) + + -- -prof and --interactive are not a good combination + when (notNull (wayNames dflags) && isInterpretiveMode cli_mode) $ + do throwDyn (UsageError + "--interactive can't be used with -prof, -ticky, -unreg or -smp.") -- -ohi sanity check - ohi <- readIORef v_Output_hi - if (isJust ohi && - (mode == DoMake || mode == DoInteractive || srcs `lengthExceeds` 1)) + if (isJust (outputHi dflags) && + (isCompManagerMode cli_mode || srcs `lengthExceeds` 1)) then throwDyn (UsageError "-ohi can only be used when compiling a single source file") else do -- -o sanity checking - o_file <- readIORef v_Output_file - if (srcs `lengthExceeds` 1 && isJust o_file && mode /= DoLink && mode /= DoMkDLL) + if (srcs `lengthExceeds` 1 && isJust (outputFile dflags) + && not (isLinkMode cli_mode)) then throwDyn (UsageError "can't apply -o to multiple source files") else do - -- Check that there are some input files (except in the interactive - -- case) - if null srcs && null objs && mode /= DoInteractive + -- Check that there are some input files + -- (except in the interactive case) + if null srcs && null objs && not (isInterpretiveMode cli_mode) then throwDyn (UsageError "no input files") else do - -- Complain about any unknown flags - let unknown_opts = [ f | f@('-':_) <- srcs ] - when (notNull unknown_opts) (unknownFlagsErr unknown_opts) - -- Verify that output files point somewhere sensible. - verifyOutputFiles + verifyOutputFiles dflags + + +-- Compiler output options + +-- called to verify that the output files & directories +-- point somewhere valid. +-- +-- The assumption is that the directory portion of these output +-- options will have to exist by the time 'verifyOutputFiles' +-- is invoked. +-- +verifyOutputFiles :: DynFlags -> IO () +verifyOutputFiles dflags = do + let odir = outputDir dflags + when (isJust odir) $ do + let dir = fromJust odir + flg <- doesDirectoryExist dir + when (not flg) (nonExistentDir "-odir" dir) + let ofile = outputFile dflags + when (isJust ofile) $ do + let fn = fromJust ofile + flg <- doesDirNameExist fn + when (not flg) (nonExistentDir "-o" fn) + let ohi = outputHi dflags + when (isJust ohi) $ do + let hi = fromJust ohi + flg <- doesDirNameExist hi + when (not flg) (nonExistentDir "-ohi" hi) + where + nonExistentDir flg dir = + throwDyn (CmdLineError ("error: directory portion of " ++ + show dir ++ " does not exist (used with " ++ + show flg ++ " option.)")) + +----------------------------------------------------------------------------- +-- GHC modes of operation + +data CmdLineMode + = ShowUsage -- ghc -? + | PrintLibdir -- ghc --print-libdir + | ShowVersion -- ghc -V/--version + | ShowNumVersion -- ghc --numeric-version + | ShowInterface String -- ghc --show-iface + | DoMkDependHS -- ghc -M + | StopBefore Phase -- ghc -E | -C | -S + -- StopBefore StopLn is the default + | DoMake -- ghc --make + | DoInteractive -- ghc --interactive + | DoEval String -- ghc -e + deriving (Show) + +isInteractiveMode, isInterpretiveMode :: CmdLineMode -> Bool +isLinkMode, isCompManagerMode :: CmdLineMode -> Bool + +isInteractiveMode DoInteractive = True +isInteractiveMode _ = False + +-- isInterpretiveMode: byte-code compiler involved +isInterpretiveMode DoInteractive = True +isInterpretiveMode (DoEval _) = True +isInterpretiveMode _ = False + +-- True if we are going to attempt to link in this mode. +-- (we might not actually link, depending on the GhcLink flag) +isLinkMode (StopBefore StopLn) = True +isLinkMode DoMake = True +isLinkMode _ = False + +isCompManagerMode DoMake = True +isCompManagerMode DoInteractive = True +isCompManagerMode (DoEval _) = True +isCompManagerMode _ = False + + +-- ----------------------------------------------------------------------------- +-- Parsing the mode flag + +parseModeFlags :: [String] -> IO (CmdLineMode, [String]) +parseModeFlags args = do + let ((leftover, errs), (mode, _, flags)) = + runCmdLine (processArgs mode_flags args) (StopBefore StopLn, "", []) + when (not (null errs)) $ do + throwDyn (UsageError (unlines errs)) + return (mode, flags ++ leftover) + +type ModeM a = CmdLineP (CmdLineMode, String, [String]) a + -- mode flags sometimes give rise to new DynFlags (eg. -C, see below) + -- so we collect the new ones and return them. + +mode_flags :: [(String, OptKind (CmdLineP (CmdLineMode, String, [String])))] +mode_flags = + [ ------- help / version ---------------------------------------------- + ( "?" , PassFlag (setMode ShowUsage)) + , ( "-help" , PassFlag (setMode ShowUsage)) + , ( "-print-libdir" , PassFlag (setMode PrintLibdir)) + , ( "V" , PassFlag (setMode ShowVersion)) + , ( "-version" , PassFlag (setMode ShowVersion)) + , ( "-numeric-version", PassFlag (setMode ShowNumVersion)) + + ------- interfaces ---------------------------------------------------- + , ( "-show-iface" , HasArg (\f -> setMode (ShowInterface f) + "--show-iface")) + + ------- primary modes ------------------------------------------------ + , ( "M" , PassFlag (setMode DoMkDependHS)) + , ( "E" , PassFlag (setMode (StopBefore anyHsc))) + , ( "C" , PassFlag (\f -> do setMode (StopBefore HCc) f + addFlag "-fvia-C")) + , ( "S" , PassFlag (setMode (StopBefore As))) + , ( "-make" , PassFlag (setMode DoMake)) + , ( "-interactive" , PassFlag (setMode DoInteractive)) + , ( "e" , HasArg (\s -> setMode (DoEval s) "-e")) + + -- -fno-code says to stop after Hsc but don't generate any code. + , ( "fno-code" , PassFlag (\f -> do setMode (StopBefore HCc) f + addFlag "-fno-code" + addFlag "-no-recomp")) + ] + +setMode :: CmdLineMode -> String -> ModeM () +setMode m flag = do + (old_mode, old_flag, flags) <- getCmdLineState + when (notNull old_flag && flag /= old_flag) $ + throwDyn (UsageError + ("cannot use `" ++ old_flag ++ "' with `" ++ flag ++ "'")) + putCmdLineState (m, flag, flags) + +addFlag :: String -> ModeM () +addFlag s = do + (m, f, flags) <- getCmdLineState + putCmdLineState (m, f, s:flags) -- ----------------------------------------------------------------------------- -- Compile files in one-shot mode. -compileFiles :: GhcMode +oneShot :: DynFlags -> Phase -> [String] -> IO () +oneShot dflags stop_phase srcs = do + o_files <- compileFiles stop_phase dflags srcs + doLink dflags stop_phase o_files + +compileFiles :: Phase + -> DynFlags -> [String] -- Source files -> IO [String] -- Object files -compileFiles mode srcs = do - stop_flag <- readIORef v_GhcModeFlag - mapM (compileFile mode stop_flag) srcs - +compileFiles stop_phase dflags srcs + = mapM (compileFile stop_phase dflags) srcs -compileFile mode stop_flag src = do - restoreDynFlags - +compileFile :: Phase -> DynFlags -> FilePath -> IO FilePath +compileFile stop_phase dflags src = do exists <- doesFileExist src when (not exists) $ - throwDyn (CmdLineError ("file `" ++ src ++ "' does not exist")) + throwDyn (CmdLineError ("does not exist: " ++ src)) - o_file <- readIORef v_Output_file - -- when linking, the -o argument refers to the linker's output. - -- otherwise, we use it as the name for the pipeline's output. - let maybe_o_file - | mode==DoLink || mode==DoMkDLL = Nothing - | otherwise = o_file + let + split = dopt Opt_SplitObjs dflags + o_file = outputFile dflags + ghc_link = ghcLink dflags -- Set by -c or -no-link - runPipeline mode stop_flag True maybe_o_file src + -- When linking, the -o argument refers to the linker's output. + -- otherwise, we use it as the name for the pipeline's output. + maybe_o_file + | StopLn <- stop_phase, not (isNoLink ghc_link) = Nothing + -- -o foo applies to linker + | otherwise = o_file + -- -o foo applies to the file we are compiling now + + stop_phase' = case stop_phase of + As | split -> SplitAs + other -> stop_phase + + (_, out_file) <- runPipeline stop_phase' dflags + True maybe_o_file src Nothing{-no ModLocation-} + return out_file + + +doLink :: DynFlags -> Phase -> [FilePath] -> IO () +doLink dflags stop_phase o_files + | not (isStopLn stop_phase) + = return () -- We stopped before the linking phase + + | otherwise + = case ghcLink dflags of + NoLink -> return () + StaticLink -> staticLink dflags o_files link_pkgs + MkDLL -> doMkDLL dflags o_files link_pkgs + where + -- Always link in the haskell98 package for static linking. Other + -- packages have to be specified via the -package flag. + link_pkgs + | ExtPackage h98_id <- haskell98PackageId (pkgState dflags) = [h98_id] + | otherwise = [] -- ---------------------------------------------------------------------------- -- Run --make mode -doMake :: [String] -> IO () -doMake [] = throwDyn (UsageError "no input files") -doMake srcs = do - dflags <- getDynFlags - state <- cmInit Batch - graph <- cmDepAnal state dflags srcs - (_, ok_flag, _) <- cmLoadModules state dflags graph +doMake :: DynFlags -> [String] -> IO () +doMake dflags [] = throwDyn (UsageError "no input files") +doMake dflags srcs = do + state <- cmInit dflags + graph <- cmDepAnal state srcs + (_, ok_flag, _) <- cmLoadModules state graph when (failed ok_flag) (exitWith (ExitFailure 1)) return () + -- --------------------------------------------------------------------------- -- Various banners and verbosity output. -showBanners :: GhcMode -> FilePath -> [String] -> IO () -showBanners mode conf_file static_opts = do - verb <- dynFlag verbosity - +showBanner :: CmdLineMode -> DynFlags -> IO () +showBanner cli_mode dflags = do + let verb = verbosity dflags -- Show the GHCi banner # ifdef GHCI - when (mode == DoInteractive && verb >= 1) $ + when (isInteractiveMode cli_mode && verb >= 1) $ hPutStrLn stdout ghciWelcomeMsg # endif -- Display details of the configuration in verbose mode - when (verb >= 2) - (do hPutStr stderr "Glasgow Haskell Compiler, Version " - hPutStr stderr cProjectVersion - hPutStr stderr ", for Haskell 98, compiled by GHC version " - hPutStrLn stderr cBooterVersion) - - when (verb >= 2) - (hPutStrLn stderr ("Using package config file: " ++ conf_file)) + when (not (isInteractiveMode cli_mode) && verb >= 2) $ + do hPutStr stderr "Glasgow Haskell Compiler, Version " + hPutStr stderr cProjectVersion + hPutStr stderr ", for Haskell 98, compiled by GHC version " + hPutStrLn stderr cBooterVersion + +showVersion :: IO () +showVersion = do + putStrLn (cProjectName ++ ", version " ++ cProjectVersion) + exitWith ExitSuccess + +showGhcUsage cli_mode = do + (ghc_usage_path,ghci_usage_path) <- getUsageMsgPaths + let usage_path + | DoInteractive <- cli_mode = ghci_usage_path + | otherwise = ghc_usage_path + usage <- readFile usage_path + dump usage + exitWith ExitSuccess + where + dump "" = return () + dump ('$':'$':s) = hPutStr stderr progName >> dump s + dump (c:s) = hPutChar stderr c >> dump s - pkg_details <- getPackageConfigMap - showPackages pkg_details +-- ----------------------------------------------------------------------------- +-- Util - when (verb >= 3) - (hPutStrLn stderr ("Hsc static flags: " ++ unwords static_opts)) +unknownFlagsErr :: [String] -> a +unknownFlagsErr fs = throwDyn (UsageError ("unrecognised flags: " ++ unwords fs))