5 -- (c) The University of Glasgow 2005
8 -- Most flags are dynamic flags, which means they can change from
9 -- compilation to compilation using @OPTIONS_GHC@ pragmas, and in a
10 -- multi-session GHC each session can be using different dynamic
11 -- flags. Dynamic flags can also be set at the prompt in GHCi.
13 -- * Dynamic flags and associated configuration types
16 HscTarget(..), isObjectTarget, defaultObjectTarget,
17 GhcMode(..), isOneShot,
18 GhcLink(..), isNoLink,
26 -- ** Manipulating DynFlags
27 defaultDynFlags, -- DynFlags
28 initDynFlags, -- DynFlags -> IO DynFlags
30 dopt, -- DynFlag -> DynFlags -> Bool
31 dopt_set, dopt_unset, -- DynFlags -> DynFlag -> DynFlags
32 getOpts, -- DynFlags -> (DynFlags -> [a]) -> [a]
39 -- ** Parsing DynFlags
41 parseDynamicNoPackageFlags,
44 supportedLanguages, languageOptions,
46 -- ** DynFlag C compiler options
47 machdepCCOpts, picCCOpts,
49 -- * Configuration of the core-to-core passes
56 -- * Configuration of the stg-to-stg passes
60 -- * Compiler configuration suitable for display to the user
65 #include "HsVersions.h"
67 #ifndef OMIT_NATIVE_CODEGEN
72 import PrelNames ( mAIN )
74 import {-# SOURCE #-} Packages (PackageState)
75 import DriverPhases ( Phase(..), phaseInputExt )
78 import Constants ( mAX_CONTEXT_REDUCTION_DEPTH )
81 import Maybes ( orElse )
86 import {-# SOURCE #-} ErrUtils ( Severity(..), Message, mkLocMessage )
89 import Control.Monad ( when )
93 import System.FilePath
94 import System.IO ( stderr, hPutChar )
96 -- -----------------------------------------------------------------------------
99 -- | Enumerates the simple on-or-off dynamic flags
105 | Opt_D_dump_cmmz_pretty
109 | Opt_D_dump_asm_native
110 | Opt_D_dump_asm_liveness
111 | Opt_D_dump_asm_coalesce
112 | Opt_D_dump_asm_regalloc
113 | Opt_D_dump_asm_regalloc_stages
114 | Opt_D_dump_asm_conflicts
115 | Opt_D_dump_asm_stats
116 | Opt_D_dump_asm_expanded
122 | Opt_D_dump_inlinings
123 | Opt_D_dump_rule_firings
124 | Opt_D_dump_occur_anal
128 | Opt_D_dump_simpl_iterations
129 | Opt_D_dump_simpl_phases
138 | Opt_D_dump_worker_wrapper
139 | Opt_D_dump_rn_trace
140 | Opt_D_dump_rn_stats
142 | Opt_D_dump_simpl_stats
143 | Opt_D_dump_tc_trace
144 | Opt_D_dump_if_trace
151 | Opt_D_verbose_core2core
152 | Opt_D_verbose_stg2stg
154 | Opt_D_dump_hi_diffs
155 | Opt_D_dump_minimal_imports
156 | Opt_D_dump_mod_cycles
157 | Opt_D_dump_view_pattern_commoning
158 | Opt_D_faststring_stats
159 | Opt_DumpToFile -- ^ Append dump output to files instead of stdout.
160 | Opt_D_no_debug_output
166 | Opt_WarnIsError -- -Werror; makes warnings fatal
167 | Opt_WarnDuplicateExports
169 | Opt_WarnImplicitPrelude
170 | Opt_WarnIncompletePatterns
171 | Opt_WarnIncompletePatternsRecUpd
172 | Opt_WarnMissingFields
173 | Opt_WarnMissingMethods
174 | Opt_WarnMissingSigs
175 | Opt_WarnNameShadowing
176 | Opt_WarnOverlappingPatterns
177 | Opt_WarnSimplePatterns
178 | Opt_WarnTypeDefaults
179 | Opt_WarnMonomorphism
180 | Opt_WarnUnusedBinds
181 | Opt_WarnUnusedImports
182 | Opt_WarnUnusedMatches
183 | Opt_WarnWarningsDeprecations
184 | Opt_WarnDeprecatedFlags
185 | Opt_WarnDodgyExports
186 | Opt_WarnDodgyImports
189 | Opt_WarnUnrecognisedPragmas
190 | Opt_WarnDodgyForeignImports
191 | Opt_WarnLazyUnliftedBindings
192 | Opt_WarnUnusedDoBind
193 | Opt_WarnWrongDoBind
197 | Opt_OverlappingInstances
198 | Opt_UndecidableInstances
199 | Opt_IncoherentInstances
200 | Opt_MonomorphismRestriction
203 | Opt_ExtendedDefaultRules -- Use GHC's extended rules for defaulting
204 | Opt_ForeignFunctionInterface
205 | Opt_UnliftedFFITypes
206 | Opt_GHCForeignImportPrim
207 | Opt_PArr -- Syntactic support for parallel arrays
208 | Opt_Arrows -- Arrow-notation syntax
209 | Opt_TemplateHaskell
212 | Opt_Generics -- "Derivable type classes"
213 | Opt_ImplicitPrelude
214 | Opt_ScopedTypeVariables
218 | Opt_OverloadedStrings
219 | Opt_DisambiguateRecordFields
220 | Opt_RecordWildCards
227 | Opt_StandaloneDeriving
228 | Opt_DeriveDataTypeable
230 | Opt_DeriveTraversable
233 | Opt_TypeSynonymInstances
234 | Opt_FlexibleContexts
235 | Opt_FlexibleInstances
236 | Opt_ConstrainedClassMethods
237 | Opt_MultiParamTypeClasses
238 | Opt_FunctionalDependencies
240 | Opt_PolymorphicComponents
241 | Opt_ExistentialQuantification
245 | Opt_ParallelListComp
246 | Opt_TransformListComp
247 | Opt_GeneralizedNewtypeDeriving
250 | Opt_PostfixOperators
253 | Opt_LiberalTypeSynonyms
256 | Opt_ImpredicativeTypes
259 | Opt_NewQualifiedOperators
262 | Opt_PrintExplicitForalls
269 | Opt_StaticArgumentTransformation
273 | Opt_DoLambdaEtaExpansion
277 | Opt_UnboxStrictFields
280 | Opt_EnableRewriteRules -- Apply rewrite rules during simplification
282 | Opt_RegsGraph -- do graph coloring register allocation
283 | Opt_RegsIterative -- do iterative coalescing graph coloring register allocation
286 | Opt_IgnoreInterfacePragmas
287 | Opt_OmitInterfacePragmas
288 | Opt_ExposeAllUnfoldings
291 | Opt_AutoSccsOnAllToplevs
292 | Opt_AutoSccsOnExportedToplevs
293 | Opt_AutoSccsOnIndividualCafs
301 | Opt_ExcessPrecision
302 | Opt_EagerBlackHoling
303 | Opt_ReadUserPackageConf
307 | Opt_HideAllPackages
308 | Opt_PrintBindResult
312 | Opt_BreakOnException
314 | Opt_PrintEvldWithShow
315 | Opt_PrintBindContents
318 | Opt_EmitExternalCore
320 | Opt_BuildingCabalPackage
325 | Opt_ConvertToZipCfgAndBack
326 | Opt_AutoLinkPackages
327 | Opt_ImplicitImportQualified
336 | Opt_KeepRawTokenStream
340 -- | Contains not only a collection of 'DynFlag's but also a plethora of
341 -- information relating to the compilation of a single file or GHC session
342 data DynFlags = DynFlags {
345 coreToDo :: Maybe [CoreToDo], -- reserved for -Ofile
346 stgToDo :: Maybe [StgToDo], -- similarly
347 hscTarget :: HscTarget,
348 hscOutName :: String, -- ^ Name of the output file
349 extCoreName :: String, -- ^ Name of the .hcr output file
350 verbosity :: Int, -- ^ Verbosity level: see Note [Verbosity levels]
351 optLevel :: Int, -- ^ Optimisation level
352 simplPhases :: Int, -- ^ Number of simplifier phases
353 maxSimplIterations :: Int, -- ^ Max simplifier iterations
354 shouldDumpSimplPhase :: SimplifierMode -> Bool,
355 ruleCheck :: Maybe String,
356 strictnessBefore :: [Int], -- ^ Additional demand analysis
358 specConstrThreshold :: Maybe Int, -- ^ Threshold for SpecConstr
359 specConstrCount :: Maybe Int, -- ^ Max number of specialisations for any one function
360 liberateCaseThreshold :: Maybe Int, -- ^ Threshold for LiberateCase
362 #ifndef OMIT_NATIVE_CODEGEN
363 targetPlatform :: Platform, -- ^ The platform we're compiling for. Used by the NCG.
365 stolen_x86_regs :: Int,
366 cmdlineHcIncludes :: [String], -- ^ @\-\#includes@
367 importPaths :: [FilePath],
369 mainFunIs :: Maybe String,
370 ctxtStkDepth :: Int, -- ^ Typechecker context stack depth
372 dphBackend :: DPHBackend,
374 thisPackage :: PackageId, -- ^ name of package currently being compiled
377 ways :: [Way], -- ^ Way flags from the command line
378 buildTag :: String, -- ^ The global \"way\" (e.g. \"p\" for prof)
379 rtsBuildTag :: String, -- ^ The RTS \"way\"
381 -- For object splitting
382 splitInfo :: Maybe (String,Int),
385 objectDir :: Maybe String,
386 hiDir :: Maybe String,
387 stubDir :: Maybe String,
393 outputFile :: Maybe String,
394 outputHi :: Maybe String,
395 dynLibLoader :: DynLibLoader,
397 -- | This is set by 'DriverPipeline.runPipeline' based on where
398 -- its output is going.
399 dumpPrefix :: Maybe FilePath,
401 -- | Override the 'dumpPrefix' set by 'DriverPipeline.runPipeline'.
402 -- Set by @-ddump-file-prefix@
403 dumpPrefixForce :: Maybe FilePath,
405 includePaths :: [String],
406 libraryPaths :: [String],
407 frameworkPaths :: [String], -- used on darwin only
408 cmdlineFrameworks :: [String], -- ditto
409 tmpDir :: String, -- no trailing '/'
411 ghcUsagePath :: FilePath, -- Filled in by SysTools
412 ghciUsagePath :: FilePath, -- ditto
414 hpcDir :: String, -- ^ Path to store the .mix files
416 -- options for particular phases
424 opt_windres :: [String],
426 -- commands for particular phases
428 pgm_P :: (String,[Option]),
430 pgm_c :: (String,[Option]),
431 pgm_m :: (String,[Option]),
432 pgm_s :: (String,[Option]),
433 pgm_a :: (String,[Option]),
434 pgm_l :: (String,[Option]),
435 pgm_dll :: (String,[Option]),
437 pgm_sysman :: String,
438 pgm_windres :: String,
441 depMakefile :: FilePath,
442 depIncludePkgDeps :: Bool,
443 depExcludeMods :: [ModuleName],
444 depSuffixes :: [String],
447 extraPkgConfs :: [FilePath],
448 topDir :: FilePath, -- filled in by SysTools
449 systemPackageConfig :: FilePath, -- ditto
450 -- ^ The @-package-conf@ flags given on the command line, in the order
453 packageFlags :: [PackageFlag],
454 -- ^ The @-package@ and @-hide-package@ flags from the command-line
457 -- NB. do not modify this field, it is calculated by
458 -- Packages.initPackages and Packages.updatePackages.
459 pkgDatabase :: Maybe [PackageConfig],
460 pkgState :: PackageState,
463 -- These have to be IORefs, because the defaultCleanupHandler needs to
464 -- know what to clean when an exception happens
465 filesToClean :: IORef [FilePath],
466 dirsToClean :: IORef (FiniteMap FilePath FilePath),
471 -- | Message output action: use "ErrUtils" instead of this if you can
472 log_action :: Severity -> SrcSpan -> PprStyle -> Message -> IO (),
474 haddockOptions :: Maybe String
477 wayNames :: DynFlags -> [WayName]
478 wayNames = map wayName . ways
480 -- | The target code type of the compilation (if any).
482 -- Whenever you change the target, also make sure to set 'ghcLink' to
483 -- something sensible.
485 -- 'HscNothing' can be used to avoid generating any output, however, note
488 -- * This will not run the desugaring step, thus no warnings generated in
489 -- this step will be output. In particular, this includes warnings related
490 -- to pattern matching. You can run the desugarer manually using
491 -- 'GHC.desugarModule'.
493 -- * If a program uses Template Haskell the typechecker may try to run code
494 -- from an imported module. This will fail if no code has been generated
495 -- for this module. You can use 'GHC.needsTemplateHaskell' to detect
496 -- whether this might be the case and choose to either switch to a
497 -- different target or avoid typechecking such modules. (The latter may
498 -- preferable for security reasons.)
501 = HscC -- ^ Generate C code.
502 | HscAsm -- ^ Generate assembly using the native code generator.
503 | HscJava -- ^ Generate Java bytecode.
504 | HscInterpreted -- ^ Generate bytecode. (Requires 'LinkInMemory')
505 | HscNothing -- ^ Don't generate any code. See notes above.
508 -- | Will this target result in an object file on the disk?
509 isObjectTarget :: HscTarget -> Bool
510 isObjectTarget HscC = True
511 isObjectTarget HscAsm = True
512 isObjectTarget _ = False
514 -- | The 'GhcMode' tells us whether we're doing multi-module
515 -- compilation (controlled via the "GHC" API) or one-shot
516 -- (single-module) compilation. This makes a difference primarily to
517 -- the "Finder": in one-shot mode we look for interface files for
518 -- imported modules, but in multi-module mode we look for source files
519 -- in order to check whether they need to be recompiled.
521 = CompManager -- ^ @\-\-make@, GHCi, etc.
522 | OneShot -- ^ @ghc -c Foo.hs@
523 | MkDepend -- ^ @ghc -M@, see "Finder" for why we need this
526 instance Outputable GhcMode where
527 ppr CompManager = ptext (sLit "CompManager")
528 ppr OneShot = ptext (sLit "OneShot")
529 ppr MkDepend = ptext (sLit "MkDepend")
531 isOneShot :: GhcMode -> Bool
532 isOneShot OneShot = True
533 isOneShot _other = False
535 -- | What to do in the link step, if there is one.
537 = NoLink -- ^ Don't link at all
538 | LinkBinary -- ^ Link object code into a binary
539 | LinkInMemory -- ^ Use the in-memory dynamic linker (works for both
540 -- bytecode and object code).
541 | LinkDynLib -- ^ Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
544 isNoLink :: GhcLink -> Bool
545 isNoLink NoLink = True
548 -- Is it worth evaluating this Bool and caching it in the DynFlags value
549 -- during initDynFlags?
550 doingTickyProfiling :: DynFlags -> Bool
551 doingTickyProfiling _ = opt_Ticky
552 -- XXX -ticky is a static flag, because it implies -debug which is also
553 -- static. If the way flags were made dynamic, we could fix this.
556 = ExposePackage String
557 | ExposePackageId String
559 | IgnorePackage String
562 defaultHscTarget :: HscTarget
563 defaultHscTarget = defaultObjectTarget
565 -- | The 'HscTarget' value corresponding to the default way to create
566 -- object files on the current platform.
567 defaultObjectTarget :: HscTarget
569 | cGhcWithNativeCodeGen == "YES" = HscAsm
574 | Wrapped (Maybe String)
578 -- | Used by 'GHC.newSession' to partially initialize a new 'DynFlags' value
579 initDynFlags :: DynFlags -> IO DynFlags
580 initDynFlags dflags = do
581 -- someday these will be dynamic flags
582 ways <- readIORef v_Ways
583 refFilesToClean <- newIORef []
584 refDirsToClean <- newIORef emptyFM
587 buildTag = mkBuildTag (filter (not . wayRTSOnly) ways),
588 rtsBuildTag = mkBuildTag ways,
589 filesToClean = refFilesToClean,
590 dirsToClean = refDirsToClean
593 -- | The normal 'DynFlags'. Note that they is not suitable for use in this form
594 -- and must be fully initialized by 'GHC.newSession' first.
595 defaultDynFlags :: DynFlags
598 ghcMode = CompManager,
599 ghcLink = LinkBinary,
602 hscTarget = defaultHscTarget,
608 maxSimplIterations = 4,
609 shouldDumpSimplPhase = const False,
611 specConstrThreshold = Just 200,
612 specConstrCount = Just 3,
613 liberateCaseThreshold = Just 200,
614 strictnessBefore = [],
616 #ifndef OMIT_NATIVE_CODEGEN
617 targetPlatform = defaultTargetPlatform,
620 cmdlineHcIncludes = [],
624 ctxtStkDepth = mAX_CONTEXT_REDUCTION_DEPTH,
628 thisPackage = mainPackageId,
634 objectSuf = phaseInputExt StopLn,
635 hcSuf = phaseInputExt HCc,
638 outputFile = Nothing,
640 dynLibLoader = SystemDependent,
641 dumpPrefix = Nothing,
642 dumpPrefixForce = Nothing,
646 cmdlineFrameworks = [],
647 tmpDir = cDEFAULT_TMPDIR,
653 then ["-D__PIC__", "-U __PIC__"] -- this list is reversed
664 pkgDatabase = Nothing,
665 pkgState = panic "no package state yet: call GHC.setSessionDynFlags",
666 ways = panic "defaultDynFlags: No ways",
667 buildTag = panic "defaultDynFlags: No buildTag",
668 rtsBuildTag = panic "defaultDynFlags: No rtsBuildTag",
670 -- initSysTools fills all these in
671 ghcUsagePath = panic "defaultDynFlags: No ghciUsagePath",
672 ghciUsagePath = panic "defaultDynFlags: No ghciUsagePath",
673 topDir = panic "defaultDynFlags: No topDir",
674 systemPackageConfig = panic "no systemPackageConfig: call GHC.setSessionDynFlags",
675 pgm_L = panic "defaultDynFlags: No pgm_L",
676 pgm_P = panic "defaultDynFlags: No pgm_P",
677 pgm_F = panic "defaultDynFlags: No pgm_F",
678 pgm_c = panic "defaultDynFlags: No pgm_c",
679 pgm_m = panic "defaultDynFlags: No pgm_m",
680 pgm_s = panic "defaultDynFlags: No pgm_s",
681 pgm_a = panic "defaultDynFlags: No pgm_a",
682 pgm_l = panic "defaultDynFlags: No pgm_l",
683 pgm_dll = panic "defaultDynFlags: No pgm_dll",
684 pgm_T = panic "defaultDynFlags: No pgm_T",
685 pgm_sysman = panic "defaultDynFlags: No pgm_sysman",
686 pgm_windres = panic "defaultDynFlags: No pgm_windres",
687 -- end of initSysTools values
689 depMakefile = "Makefile",
690 depIncludePkgDeps = False,
693 -- end of ghc -M values
694 filesToClean = panic "defaultDynFlags: No filesToClean",
695 dirsToClean = panic "defaultDynFlags: No dirsToClean",
696 haddockOptions = Nothing,
698 Opt_AutoLinkPackages,
699 Opt_ReadUserPackageConf,
701 Opt_MonoPatBinds, -- Experimentally, I'm making this non-standard
702 -- behaviour the default, to see if anyone notices
706 Opt_MonomorphismRestriction,
717 Opt_PrintBindContents
719 ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
720 -- The default -O0 options
723 log_action = \severity srcSpan style msg ->
725 SevInfo -> printErrs (msg style)
726 SevFatal -> printErrs (msg style)
729 printErrs ((mkLocMessage srcSpan msg) style)
730 -- careful (#2302): printErrs prints in UTF-8, whereas
731 -- converting to string first and using hPutStr would
732 -- just emit the low 8 bits of each unicode char.
736 Note [Verbosity levels]
737 ~~~~~~~~~~~~~~~~~~~~~~~
738 0 | print errors & warnings only
739 1 | minimal verbosity: print "compiling M ... done." for each module.
740 2 | equivalent to -dshow-passes
741 3 | equivalent to existing "ghc -v"
742 4 | "ghc -v -ddump-most"
743 5 | "ghc -v -ddump-all"
746 -- | Test whether a 'DynFlag' is set
747 dopt :: DynFlag -> DynFlags -> Bool
748 dopt f dflags = f `elem` (flags dflags)
751 dopt_set :: DynFlags -> DynFlag -> DynFlags
752 dopt_set dfs f = dfs{ flags = f : flags dfs }
754 -- | Unset a 'DynFlag'
755 dopt_unset :: DynFlags -> DynFlag -> DynFlags
756 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
758 -- | Retrieve the options corresponding to a particular @opt_*@ field in the correct order
759 getOpts :: DynFlags -- ^ 'DynFlags' to retrieve the options from
760 -> (DynFlags -> [a]) -- ^ Relevant record accessor: one of the @opt_*@ accessors
761 -> [a] -- ^ Correctly ordered extracted options
762 getOpts dflags opts = reverse (opts dflags)
763 -- We add to the options from the front, so we need to reverse the list
765 -- | Gets the verbosity flag for the current verbosity level. This is fed to
766 -- other tools, so GHC-specific verbosity flags like @-ddump-most@ are not included
767 getVerbFlag :: DynFlags -> String
769 | verbosity dflags >= 3 = "-v"
772 setObjectDir, setHiDir, setStubDir, setOutputDir,
773 setObjectSuf, setHiSuf, setHcSuf, parseDynLibLoaderMode,
774 setPgmP, setPgmL, setPgmF, setPgmc, setPgmm, setPgms, setPgma, setPgml, setPgmdll, setPgmwindres,
775 addOptL, addOptP, addOptF, addOptc, addOptm, addOpta, addOptl, addOptwindres,
776 addCmdlineFramework, addHaddockOpts
777 :: String -> DynFlags -> DynFlags
778 setOutputFile, setOutputHi, setDumpPrefixForce
779 :: Maybe String -> DynFlags -> DynFlags
781 setObjectDir f d = d{ objectDir = Just f}
782 setHiDir f d = d{ hiDir = Just f}
783 setStubDir f d = d{ stubDir = Just f, includePaths = f : includePaths d }
784 -- -stubdir D adds an implicit -I D, so that gcc can find the _stub.h file
785 -- \#included from the .hc file when compiling with -fvia-C.
786 setOutputDir f = setObjectDir f . setHiDir f . setStubDir f
788 setObjectSuf f d = d{ objectSuf = f}
789 setHiSuf f d = d{ hiSuf = f}
790 setHcSuf f d = d{ hcSuf = f}
792 setOutputFile f d = d{ outputFile = f}
793 setOutputHi f d = d{ outputHi = f}
795 parseDynLibLoaderMode f d =
797 ("deploy", "") -> d{ dynLibLoader = Deployable }
798 ("sysdep", "") -> d{ dynLibLoader = SystemDependent }
799 ("wrapped", "") -> d{ dynLibLoader = Wrapped Nothing }
800 ("wrapped:", "hard") -> d{ dynLibLoader = Wrapped Nothing }
801 ("wrapped:", flex) -> d{ dynLibLoader = Wrapped (Just flex) }
802 _ -> ghcError (CmdLineError ("Unknown dynlib loader: " ++ f))
804 setDumpPrefixForce f d = d { dumpPrefixForce = f}
806 -- XXX HACK: Prelude> words "'does not' work" ===> ["'does","not'","work"]
807 -- Config.hs should really use Option.
808 setPgmP f d = let (pgm:args) = words f in d{ pgm_P = (pgm, map Option args)}
810 setPgmL f d = d{ pgm_L = f}
811 setPgmF f d = d{ pgm_F = f}
812 setPgmc f d = d{ pgm_c = (f,[])}
813 setPgmm f d = d{ pgm_m = (f,[])}
814 setPgms f d = d{ pgm_s = (f,[])}
815 setPgma f d = d{ pgm_a = (f,[])}
816 setPgml f d = d{ pgm_l = (f,[])}
817 setPgmdll f d = d{ pgm_dll = (f,[])}
818 setPgmwindres f d = d{ pgm_windres = f}
820 addOptL f d = d{ opt_L = f : opt_L d}
821 addOptP f d = d{ opt_P = f : opt_P d}
822 addOptF f d = d{ opt_F = f : opt_F d}
823 addOptc f d = d{ opt_c = f : opt_c d}
824 addOptm f d = d{ opt_m = f : opt_m d}
825 addOpta f d = d{ opt_a = f : opt_a d}
826 addOptl f d = d{ opt_l = f : opt_l d}
827 addOptwindres f d = d{ opt_windres = f : opt_windres d}
829 setDepMakefile :: FilePath -> DynFlags -> DynFlags
830 setDepMakefile f d = d { depMakefile = deOptDep f }
832 setDepIncludePkgDeps :: Bool -> DynFlags -> DynFlags
833 setDepIncludePkgDeps b d = d { depIncludePkgDeps = b }
835 addDepExcludeMod :: String -> DynFlags -> DynFlags
837 = d { depExcludeMods = mkModuleName (deOptDep m) : depExcludeMods d }
839 addDepSuffix :: FilePath -> DynFlags -> DynFlags
840 addDepSuffix s d = d { depSuffixes = deOptDep s : depSuffixes d }
843 -- We used to use "-optdep-flag -optdeparg", so for legacy applications
844 -- we need to strip the "-optdep" off of the arg
845 deOptDep :: String -> String
846 deOptDep x = case stripPrefix "-optdep" x of
850 addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}
852 addHaddockOpts f d = d{ haddockOptions = Just f}
854 -- -----------------------------------------------------------------------------
855 -- Command-line options
857 -- | When invoking external tools as part of the compilation pipeline, we
858 -- pass these a sequence of options on the command-line. Rather than
859 -- just using a list of Strings, we use a type that allows us to distinguish
860 -- between filepaths and 'other stuff'. The reason for this is that
861 -- this type gives us a handle on transforming filenames, and filenames only,
862 -- to whatever format they're expected to be on a particular platform.
864 = FileOption -- an entry that _contains_ filename(s) / filepaths.
865 String -- a non-filepath prefix that shouldn't be
866 -- transformed (e.g., "/out=")
867 String -- the filepath/filename portion
870 showOpt :: Option -> String
871 showOpt (FileOption pre f) = pre ++ f
872 showOpt (Option s) = s
874 -----------------------------------------------------------------------------
875 -- Setting the optimisation level
877 updOptLevel :: Int -> DynFlags -> DynFlags
878 -- ^ Sets the 'DynFlags' to be appropriate to the optimisation level
880 = dfs2{ optLevel = final_n }
882 final_n = max 0 (min 2 n) -- Clamp to 0 <= n <= 2
883 dfs1 = foldr (flip dopt_unset) dfs remove_dopts
884 dfs2 = foldr (flip dopt_set) dfs1 extra_dopts
886 extra_dopts = [ f | (ns,f) <- optLevelFlags, final_n `elem` ns ]
887 remove_dopts = [ f | (ns,f) <- optLevelFlags, final_n `notElem` ns ]
889 optLevelFlags :: [([Int], DynFlag)]
891 = [ ([0], Opt_IgnoreInterfacePragmas)
892 , ([0], Opt_OmitInterfacePragmas)
894 , ([1,2], Opt_IgnoreAsserts)
895 , ([1,2], Opt_EnableRewriteRules) -- Off for -O0; see Note [Scoping for Builtin rules]
897 , ([1,2], Opt_DoEtaReduction)
898 , ([1,2], Opt_CaseMerge)
899 , ([1,2], Opt_Strictness)
901 , ([1,2], Opt_FullLaziness)
902 , ([1,2], Opt_Specialise)
903 , ([1,2], Opt_FloatIn)
905 , ([2], Opt_LiberateCase)
906 , ([2], Opt_SpecConstr)
908 -- , ([2], Opt_StaticArgumentTransformation)
909 -- Max writes: I think it's probably best not to enable SAT with -O2 for the
910 -- 6.10 release. The version of SAT in HEAD at the moment doesn't incorporate
911 -- several improvements to the heuristics, and I'm concerned that without
912 -- those changes SAT will interfere with some attempts to write "high
913 -- performance Haskell", as we saw in some posts on Haskell-Cafe earlier
914 -- this year. In particular, the version in HEAD lacks the tail call
915 -- criterion, so many things that look like reasonable loops will be
916 -- turned into functions with extra (unneccesary) thunk creation.
918 , ([0,1,2], Opt_DoLambdaEtaExpansion)
919 -- This one is important for a tiresome reason:
920 -- we want to make sure that the bindings for data
921 -- constructors are eta-expanded. This is probably
922 -- a good thing anyway, but it seems fragile.
925 -- -----------------------------------------------------------------------------
926 -- Standard sets of warning options
928 standardWarnings :: [DynFlag]
930 = [ Opt_WarnWarningsDeprecations,
931 Opt_WarnDeprecatedFlags,
932 Opt_WarnUnrecognisedPragmas,
933 Opt_WarnOverlappingPatterns,
934 Opt_WarnMissingFields,
935 Opt_WarnMissingMethods,
936 Opt_WarnDuplicateExports,
937 Opt_WarnLazyUnliftedBindings,
938 Opt_WarnDodgyForeignImports,
942 minusWOpts :: [DynFlag]
944 = standardWarnings ++
945 [ Opt_WarnUnusedBinds,
946 Opt_WarnUnusedMatches,
947 Opt_WarnUnusedImports,
948 Opt_WarnIncompletePatterns,
949 Opt_WarnDodgyExports,
953 minusWallOpts :: [DynFlag]
956 [ Opt_WarnTypeDefaults,
957 Opt_WarnNameShadowing,
964 -- minuswRemovesOpts should be every warning option
965 minuswRemovesOpts :: [DynFlag]
968 [Opt_WarnImplicitPrelude,
969 Opt_WarnIncompletePatternsRecUpd,
970 Opt_WarnSimplePatterns,
971 Opt_WarnMonomorphism,
972 Opt_WarnUnrecognisedPragmas,
976 -- -----------------------------------------------------------------------------
977 -- CoreToDo: abstraction of core-to-core passes to run.
979 data CoreToDo -- These are diff core-to-core passes,
980 -- which may be invoked in any order,
981 -- as many times as you like.
983 = CoreDoSimplify -- The core-to-core simplifier.
986 -- Each run of the simplifier can take a different
987 -- set of simplifier-specific flags.
989 | CoreDoFloatOutwards FloatOutSwitches
994 | CoreDoWorkerWrapper
997 | CoreDoOldStrictness
1000 | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
1001 -- matching this string
1002 | CoreDoVectorisation PackageId
1003 | CoreDoNothing -- Useful when building up
1004 | CoreDoPasses [CoreToDo] -- lists of these things
1007 data SimplifierMode -- See comments in SimplMonad
1009 { sm_rules :: Bool -- Whether RULES are enabled
1010 , sm_inline :: Bool } -- Whether inlining is enabled
1013 { sm_num :: Int -- Phase number; counts downward so 0 is last phase
1014 , sm_names :: [String] } -- Name(s) of the phase
1016 instance Outputable SimplifierMode where
1017 ppr (SimplPhase { sm_num = n, sm_names = ss })
1018 = int n <+> brackets (text (concat $ intersperse "," ss))
1019 ppr (SimplGently { sm_rules = r, sm_inline = i })
1020 = ptext (sLit "gentle") <>
1021 brackets (pp_flag r (sLit "rules") <> comma <>
1022 pp_flag i (sLit "inline"))
1024 pp_flag f s = ppUnless f (ptext (sLit "no")) <+> ptext s
1026 data SimplifierSwitch
1027 = MaxSimplifierIterations Int
1030 data FloatOutSwitches = FloatOutSwitches {
1031 floatOutLambdas :: Bool, -- ^ True <=> float lambdas to top level
1032 floatOutConstants :: Bool -- ^ True <=> float constants to top level,
1033 -- even if they do not escape a lambda
1036 instance Outputable FloatOutSwitches where
1037 ppr = pprFloatOutSwitches
1039 pprFloatOutSwitches :: FloatOutSwitches -> SDoc
1040 pprFloatOutSwitches sw = pp_not (floatOutLambdas sw) <+> text "lambdas" <> comma
1041 <+> pp_not (floatOutConstants sw) <+> text "constants"
1044 pp_not False = text "not"
1046 -- | Switches that specify the minimum amount of floating out
1047 -- gentleFloatOutSwitches :: FloatOutSwitches
1048 -- gentleFloatOutSwitches = FloatOutSwitches False False
1050 -- | Switches that do not specify floating out of lambdas, just of constants
1051 constantsOnlyFloatOutSwitches :: FloatOutSwitches
1052 constantsOnlyFloatOutSwitches = FloatOutSwitches False True
1055 -- The core-to-core pass ordering is derived from the DynFlags:
1056 runWhen :: Bool -> CoreToDo -> CoreToDo
1057 runWhen True do_this = do_this
1058 runWhen False _ = CoreDoNothing
1060 runMaybe :: Maybe a -> (a -> CoreToDo) -> CoreToDo
1061 runMaybe (Just x) f = f x
1062 runMaybe Nothing _ = CoreDoNothing
1064 getCoreToDo :: DynFlags -> [CoreToDo]
1066 | Just todo <- coreToDo dflags = todo -- set explicitly by user
1067 | otherwise = core_todo
1069 opt_level = optLevel dflags
1070 phases = simplPhases dflags
1071 max_iter = maxSimplIterations dflags
1072 strictness = dopt Opt_Strictness dflags
1073 full_laziness = dopt Opt_FullLaziness dflags
1074 do_specialise = dopt Opt_Specialise dflags
1075 do_float_in = dopt Opt_FloatIn dflags
1076 cse = dopt Opt_CSE dflags
1077 spec_constr = dopt Opt_SpecConstr dflags
1078 liberate_case = dopt Opt_LiberateCase dflags
1079 rule_check = ruleCheck dflags
1080 static_args = dopt Opt_StaticArgumentTransformation dflags
1082 maybe_rule_check phase = runMaybe rule_check (CoreDoRuleCheck phase)
1084 maybe_strictness_before phase
1085 = runWhen (phase `elem` strictnessBefore dflags) CoreDoStrictness
1087 simpl_phase phase names iter
1089 [ maybe_strictness_before phase,
1090 CoreDoSimplify (SimplPhase phase names) [
1091 MaxSimplifierIterations iter
1093 maybe_rule_check phase
1097 = runWhen (dopt Opt_Vectorise dflags)
1098 $ CoreDoPasses [ simpl_gently, CoreDoVectorisation (dphPackage dflags) ]
1101 -- By default, we have 2 phases before phase 0.
1103 -- Want to run with inline phase 2 after the specialiser to give
1104 -- maximum chance for fusion to work before we inline build/augment
1105 -- in phase 1. This made a difference in 'ansi' where an
1106 -- overloaded function wasn't inlined till too late.
1108 -- Need phase 1 so that build/augment get
1109 -- inlined. I found that spectral/hartel/genfft lost some useful
1110 -- strictness in the function sumcode' if augment is not inlined
1111 -- before strictness analysis runs
1112 simpl_phases = CoreDoPasses [ simpl_phase phase ["main"] max_iter
1113 | phase <- [phases, phases-1 .. 1] ]
1116 -- initial simplify: mk specialiser happy: minimum effort please
1117 simpl_gently = CoreDoSimplify
1118 (SimplGently { sm_rules = True, sm_inline = False })
1120 -- Simplify "gently"
1121 -- Don't inline anything till full laziness has bitten
1122 -- In particular, inlining wrappers inhibits floating
1123 -- e.g. ...(case f x of ...)...
1124 -- ==> ...(case (case x of I# x# -> fw x#) of ...)...
1125 -- ==> ...(case x of I# x# -> case fw x# of ...)...
1126 -- and now the redex (f x) isn't floatable any more
1127 -- Similarly, don't apply any rules until after full
1128 -- laziness. Notably, list fusion can prevent floating.
1130 NoCaseOfCase, -- Don't do case-of-case transformations.
1131 -- This makes full laziness work better
1132 MaxSimplifierIterations max_iter
1136 if opt_level == 0 then
1138 simpl_phase 0 ["final"] max_iter]
1139 else {- opt_level >= 1 -} [
1141 -- We want to do the static argument transform before full laziness as it
1142 -- may expose extra opportunities to float things outwards. However, to fix
1143 -- up the output of the transformation we need at do at least one simplify
1144 -- after this before anything else
1145 runWhen static_args (CoreDoPasses [ simpl_gently, CoreDoStaticArgs ]),
1147 -- We run vectorisation here for now, but we might also try to run
1151 -- initial simplify: mk specialiser happy: minimum effort please
1154 -- Specialisation is best done before full laziness
1155 -- so that overloaded functions have all their dictionary lambdas manifest
1156 runWhen do_specialise CoreDoSpecialising,
1158 runWhen full_laziness (CoreDoFloatOutwards constantsOnlyFloatOutSwitches),
1159 -- Was: gentleFloatOutSwitches
1160 -- I have no idea why, but not floating constants to top level is
1161 -- very bad in some cases.
1162 -- Notably: p_ident in spectral/rewrite
1163 -- Changing from "gentle" to "constantsOnly" improved
1164 -- rewrite's allocation by 19%, and made 0.0% difference
1165 -- to any other nofib benchmark
1167 runWhen do_float_in CoreDoFloatInwards,
1171 -- Phase 0: allow all Ids to be inlined now
1172 -- This gets foldr inlined before strictness analysis
1174 -- At least 3 iterations because otherwise we land up with
1175 -- huge dead expressions because of an infelicity in the
1177 -- let k = BIG in foldr k z xs
1178 -- ==> let k = BIG in letrec go = \xs -> ...(k x).... in go xs
1179 -- ==> let k = BIG in letrec go = \xs -> ...(BIG x).... in go xs
1181 simpl_phase 0 ["main"] (max max_iter 3),
1183 runWhen strictness (CoreDoPasses [
1185 CoreDoWorkerWrapper,
1187 simpl_phase 0 ["post-worker-wrapper"] max_iter
1190 runWhen full_laziness
1191 (CoreDoFloatOutwards constantsOnlyFloatOutSwitches),
1192 -- nofib/spectral/hartel/wang doubles in speed if you
1193 -- do full laziness late in the day. It only happens
1194 -- after fusion and other stuff, so the early pass doesn't
1195 -- catch it. For the record, the redex is
1196 -- f_el22 (f_el21 r_midblock)
1199 runWhen cse CoreCSE,
1200 -- We want CSE to follow the final full-laziness pass, because it may
1201 -- succeed in commoning up things floated out by full laziness.
1202 -- CSE used to rely on the no-shadowing invariant, but it doesn't any more
1204 runWhen do_float_in CoreDoFloatInwards,
1208 -- Case-liberation for -O2. This should be after
1209 -- strictness analysis and the simplification which follows it.
1210 runWhen liberate_case (CoreDoPasses [
1212 simpl_phase 0 ["post-liberate-case"] max_iter
1213 ]), -- Run the simplifier after LiberateCase to vastly
1214 -- reduce the possiblility of shadowing
1215 -- Reason: see Note [Shadowing] in SpecConstr.lhs
1217 runWhen spec_constr CoreDoSpecConstr,
1221 -- Final clean-up simplification:
1222 simpl_phase 0 ["final"] max_iter
1225 -- -----------------------------------------------------------------------------
1226 -- StgToDo: abstraction of stg-to-stg passes to run.
1229 = StgDoMassageForProfiling -- should be (next to) last
1230 -- There's also setStgVarInfo, but its absolute "lastness"
1231 -- is so critical that it is hardwired in (no flag).
1234 getStgToDo :: DynFlags -> [StgToDo]
1236 | Just todo <- stgToDo dflags = todo -- set explicitly by user
1239 stg_stats = dopt Opt_StgStats dflags
1241 todo1 = if stg_stats then [D_stg_stats] else []
1243 todo2 | WayProf `elem` wayNames dflags
1244 = StgDoMassageForProfiling : todo1
1248 -- -----------------------------------------------------------------------------
1251 allFlags :: [String]
1252 allFlags = map ('-':) $
1253 [ flagName flag | flag <- dynamic_flags, ok (flagOptKind flag) ] ++
1254 map ("fno-"++) flags ++
1255 map ("f"++) flags ++
1256 map ("X"++) supportedLanguages ++
1257 map ("XNo"++) supportedLanguages
1258 where ok (PrefixPred _ _) = False
1260 flags = [ name | (name, _, _) <- fFlags ]
1262 dynamic_flags :: [Flag DynP]
1264 Flag "n" (NoArg (setDynFlag Opt_DryRun)) Supported
1265 , Flag "cpp" (NoArg (setDynFlag Opt_Cpp)) Supported
1266 , Flag "F" (NoArg (setDynFlag Opt_Pp)) Supported
1267 , Flag "#include" (HasArg (addCmdlineHCInclude))
1268 (Deprecated "No longer has any effect")
1269 , Flag "v" (OptIntSuffix setVerbosity) Supported
1271 ------- Specific phases --------------------------------------------
1272 , Flag "pgmL" (HasArg (upd . setPgmL)) Supported
1273 , Flag "pgmP" (HasArg (upd . setPgmP)) Supported
1274 , Flag "pgmF" (HasArg (upd . setPgmF)) Supported
1275 , Flag "pgmc" (HasArg (upd . setPgmc)) Supported
1276 , Flag "pgmm" (HasArg (upd . setPgmm)) Supported
1277 , Flag "pgms" (HasArg (upd . setPgms)) Supported
1278 , Flag "pgma" (HasArg (upd . setPgma)) Supported
1279 , Flag "pgml" (HasArg (upd . setPgml)) Supported
1280 , Flag "pgmdll" (HasArg (upd . setPgmdll)) Supported
1281 , Flag "pgmwindres" (HasArg (upd . setPgmwindres)) Supported
1283 , Flag "optL" (HasArg (upd . addOptL)) Supported
1284 , Flag "optP" (HasArg (upd . addOptP)) Supported
1285 , Flag "optF" (HasArg (upd . addOptF)) Supported
1286 , Flag "optc" (HasArg (upd . addOptc)) Supported
1287 , Flag "optm" (HasArg (upd . addOptm)) Supported
1288 , Flag "opta" (HasArg (upd . addOpta)) Supported
1289 , Flag "optl" (HasArg (upd . addOptl)) Supported
1290 , Flag "optwindres" (HasArg (upd . addOptwindres)) Supported
1293 (NoArg (if can_split then setDynFlag Opt_SplitObjs else return ()))
1296 -------- ghc -M -----------------------------------------------------
1297 , Flag "dep-suffix" (HasArg (upd . addDepSuffix)) Supported
1298 , Flag "optdep-s" (HasArg (upd . addDepSuffix))
1299 (Deprecated "Use -dep-suffix instead")
1300 , Flag "dep-makefile" (HasArg (upd . setDepMakefile)) Supported
1301 , Flag "optdep-f" (HasArg (upd . setDepMakefile))
1302 (Deprecated "Use -dep-makefile instead")
1303 , Flag "optdep-w" (NoArg (return ()))
1304 (Deprecated "-optdep-w doesn't do anything")
1305 , Flag "include-pkg-deps" (NoArg (upd (setDepIncludePkgDeps True))) Supported
1306 , Flag "optdep--include-prelude" (NoArg (upd (setDepIncludePkgDeps True)))
1307 (Deprecated "Use -include-pkg-deps instead")
1308 , Flag "optdep--include-pkg-deps" (NoArg (upd (setDepIncludePkgDeps True)))
1309 (Deprecated "Use -include-pkg-deps instead")
1310 , Flag "exclude-module" (HasArg (upd . addDepExcludeMod)) Supported
1311 , Flag "optdep--exclude-module" (HasArg (upd . addDepExcludeMod))
1312 (Deprecated "Use -exclude-module instead")
1313 , Flag "optdep-x" (HasArg (upd . addDepExcludeMod))
1314 (Deprecated "Use -exclude-module instead")
1316 -------- Linking ----------------------------------------------------
1317 , Flag "c" (NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
1319 , Flag "no-link" (NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
1320 (Deprecated "Use -c instead")
1321 , Flag "shared" (NoArg (upd $ \d -> d{ ghcLink=LinkDynLib } ))
1323 , Flag "dynload" (HasArg (upd . parseDynLibLoaderMode))
1326 ------- Libraries ---------------------------------------------------
1327 , Flag "L" (Prefix addLibraryPath ) Supported
1328 , Flag "l" (AnySuffix (\s -> do upd (addOptl s))) Supported
1330 ------- Frameworks --------------------------------------------------
1331 -- -framework-path should really be -F ...
1332 , Flag "framework-path" (HasArg addFrameworkPath ) Supported
1333 , Flag "framework" (HasArg (upd . addCmdlineFramework)) Supported
1335 ------- Output Redirection ------------------------------------------
1336 , Flag "odir" (HasArg (upd . setObjectDir)) Supported
1337 , Flag "o" (SepArg (upd . setOutputFile . Just)) Supported
1338 , Flag "ohi" (HasArg (upd . setOutputHi . Just )) Supported
1339 , Flag "osuf" (HasArg (upd . setObjectSuf)) Supported
1340 , Flag "hcsuf" (HasArg (upd . setHcSuf)) Supported
1341 , Flag "hisuf" (HasArg (upd . setHiSuf)) Supported
1342 , Flag "hidir" (HasArg (upd . setHiDir)) Supported
1343 , Flag "tmpdir" (HasArg (upd . setTmpDir)) Supported
1344 , Flag "stubdir" (HasArg (upd . setStubDir)) Supported
1345 , Flag "outputdir" (HasArg (upd . setOutputDir)) Supported
1346 , Flag "ddump-file-prefix" (HasArg (upd . setDumpPrefixForce . Just))
1349 ------- Keeping temporary files -------------------------------------
1350 -- These can be singular (think ghc -c) or plural (think ghc --make)
1351 , Flag "keep-hc-file" (NoArg (setDynFlag Opt_KeepHcFiles)) Supported
1352 , Flag "keep-hc-files" (NoArg (setDynFlag Opt_KeepHcFiles)) Supported
1353 , Flag "keep-s-file" (NoArg (setDynFlag Opt_KeepSFiles)) Supported
1354 , Flag "keep-s-files" (NoArg (setDynFlag Opt_KeepSFiles)) Supported
1355 , Flag "keep-raw-s-file" (NoArg (setDynFlag Opt_KeepRawSFiles)) Supported
1356 , Flag "keep-raw-s-files" (NoArg (setDynFlag Opt_KeepRawSFiles)) Supported
1357 -- This only makes sense as plural
1358 , Flag "keep-tmp-files" (NoArg (setDynFlag Opt_KeepTmpFiles)) Supported
1360 ------- Miscellaneous ----------------------------------------------
1361 , Flag "no-auto-link-packages" (NoArg (unSetDynFlag Opt_AutoLinkPackages)) Supported
1362 , Flag "no-hs-main" (NoArg (setDynFlag Opt_NoHsMain)) Supported
1363 , Flag "main-is" (SepArg setMainIs ) Supported
1364 , Flag "haddock" (NoArg (setDynFlag Opt_Haddock)) Supported
1365 , Flag "haddock-opts" (HasArg (upd . addHaddockOpts)) Supported
1366 , Flag "hpcdir" (SepArg setOptHpcDir) Supported
1368 ------- recompilation checker --------------------------------------
1369 , Flag "recomp" (NoArg (unSetDynFlag Opt_ForceRecomp))
1370 (Deprecated "Use -fno-force-recomp instead")
1371 , Flag "no-recomp" (NoArg (setDynFlag Opt_ForceRecomp))
1372 (Deprecated "Use -fforce-recomp instead")
1374 ------ HsCpp opts ---------------------------------------------------
1375 , Flag "D" (AnySuffix (upd . addOptP)) Supported
1376 , Flag "U" (AnySuffix (upd . addOptP)) Supported
1378 ------- Include/Import Paths ----------------------------------------
1379 , Flag "I" (Prefix addIncludePath) Supported
1380 , Flag "i" (OptPrefix addImportPath ) Supported
1382 ------ Debugging ----------------------------------------------------
1383 , Flag "dstg-stats" (NoArg (setDynFlag Opt_StgStats)) Supported
1385 , Flag "ddump-cmm" (setDumpFlag Opt_D_dump_cmm)
1387 , Flag "ddump-cmmz" (setDumpFlag Opt_D_dump_cmmz)
1389 , Flag "ddump-cmmz-pretty" (setDumpFlag Opt_D_dump_cmmz_pretty)
1391 , Flag "ddump-cps-cmm" (setDumpFlag Opt_D_dump_cps_cmm)
1393 , Flag "ddump-cvt-cmm" (setDumpFlag Opt_D_dump_cvt_cmm)
1395 , Flag "ddump-asm" (setDumpFlag Opt_D_dump_asm)
1397 , Flag "ddump-asm-native" (setDumpFlag Opt_D_dump_asm_native)
1399 , Flag "ddump-asm-liveness" (setDumpFlag Opt_D_dump_asm_liveness)
1401 , Flag "ddump-asm-coalesce" (setDumpFlag Opt_D_dump_asm_coalesce)
1403 , Flag "ddump-asm-regalloc" (setDumpFlag Opt_D_dump_asm_regalloc)
1405 , Flag "ddump-asm-conflicts" (setDumpFlag Opt_D_dump_asm_conflicts)
1407 , Flag "ddump-asm-regalloc-stages"
1408 (setDumpFlag Opt_D_dump_asm_regalloc_stages)
1410 , Flag "ddump-asm-stats" (setDumpFlag Opt_D_dump_asm_stats)
1412 , Flag "ddump-asm-expanded" (setDumpFlag Opt_D_dump_asm_expanded)
1414 , Flag "ddump-cpranal" (setDumpFlag Opt_D_dump_cpranal)
1416 , Flag "ddump-deriv" (setDumpFlag Opt_D_dump_deriv)
1418 , Flag "ddump-ds" (setDumpFlag Opt_D_dump_ds)
1420 , Flag "ddump-flatC" (setDumpFlag Opt_D_dump_flatC)
1422 , Flag "ddump-foreign" (setDumpFlag Opt_D_dump_foreign)
1424 , Flag "ddump-inlinings" (setDumpFlag Opt_D_dump_inlinings)
1426 , Flag "ddump-rule-firings" (setDumpFlag Opt_D_dump_rule_firings)
1428 , Flag "ddump-occur-anal" (setDumpFlag Opt_D_dump_occur_anal)
1430 , Flag "ddump-parsed" (setDumpFlag Opt_D_dump_parsed)
1432 , Flag "ddump-rn" (setDumpFlag Opt_D_dump_rn)
1434 , Flag "ddump-simpl" (setDumpFlag Opt_D_dump_simpl)
1436 , Flag "ddump-simpl-iterations" (setDumpFlag Opt_D_dump_simpl_iterations)
1438 , Flag "ddump-simpl-phases" (OptPrefix setDumpSimplPhases)
1440 , Flag "ddump-spec" (setDumpFlag Opt_D_dump_spec)
1442 , Flag "ddump-prep" (setDumpFlag Opt_D_dump_prep)
1444 , Flag "ddump-stg" (setDumpFlag Opt_D_dump_stg)
1446 , Flag "ddump-stranal" (setDumpFlag Opt_D_dump_stranal)
1448 , Flag "ddump-tc" (setDumpFlag Opt_D_dump_tc)
1450 , Flag "ddump-types" (setDumpFlag Opt_D_dump_types)
1452 , Flag "ddump-rules" (setDumpFlag Opt_D_dump_rules)
1454 , Flag "ddump-cse" (setDumpFlag Opt_D_dump_cse)
1456 , Flag "ddump-worker-wrapper" (setDumpFlag Opt_D_dump_worker_wrapper)
1458 , Flag "ddump-rn-trace" (setDumpFlag Opt_D_dump_rn_trace)
1460 , Flag "ddump-if-trace" (setDumpFlag Opt_D_dump_if_trace)
1462 , Flag "ddump-tc-trace" (setDumpFlag Opt_D_dump_tc_trace)
1464 , Flag "ddump-splices" (setDumpFlag Opt_D_dump_splices)
1466 , Flag "ddump-rn-stats" (setDumpFlag Opt_D_dump_rn_stats)
1468 , Flag "ddump-opt-cmm" (setDumpFlag Opt_D_dump_opt_cmm)
1470 , Flag "ddump-simpl-stats" (setDumpFlag Opt_D_dump_simpl_stats)
1472 , Flag "ddump-bcos" (setDumpFlag Opt_D_dump_BCOs)
1474 , Flag "dsource-stats" (setDumpFlag Opt_D_source_stats)
1476 , Flag "dverbose-core2core" (NoArg (do { setVerbosity (Just 2)
1477 ; setVerboseCore2Core }))
1479 , Flag "dverbose-stg2stg" (setDumpFlag Opt_D_verbose_stg2stg)
1481 , Flag "ddump-hi" (setDumpFlag Opt_D_dump_hi)
1483 , Flag "ddump-minimal-imports" (setDumpFlag Opt_D_dump_minimal_imports)
1485 , Flag "ddump-vect" (setDumpFlag Opt_D_dump_vect)
1487 , Flag "ddump-hpc" (setDumpFlag Opt_D_dump_hpc)
1489 , Flag "ddump-mod-cycles" (setDumpFlag Opt_D_dump_mod_cycles)
1491 , Flag "ddump-view-pattern-commoning" (setDumpFlag Opt_D_dump_view_pattern_commoning)
1493 , Flag "ddump-to-file" (setDumpFlag Opt_DumpToFile)
1495 , Flag "ddump-hi-diffs" (setDumpFlag Opt_D_dump_hi_diffs)
1497 , Flag "ddump-rtti" (setDumpFlag Opt_D_dump_rtti)
1500 , Flag "dcore-lint" (NoArg (setDynFlag Opt_DoCoreLinting))
1502 , Flag "dstg-lint" (NoArg (setDynFlag Opt_DoStgLinting))
1504 , Flag "dcmm-lint" (NoArg (setDynFlag Opt_DoCmmLinting))
1506 , Flag "dasm-lint" (NoArg (setDynFlag Opt_DoAsmLinting))
1508 , Flag "dshow-passes"
1509 (NoArg (do forceRecompile
1510 setVerbosity (Just 2)))
1512 , Flag "dfaststring-stats" (NoArg (setDynFlag Opt_D_faststring_stats))
1515 ------ Machine dependant (-m<blah>) stuff ---------------------------
1517 , Flag "monly-2-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 2}) ))
1519 , Flag "monly-3-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 3}) ))
1521 , Flag "monly-4-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 4}) ))
1524 ------ Warning opts -------------------------------------------------
1525 , Flag "W" (NoArg (mapM_ setDynFlag minusWOpts))
1527 , Flag "Werror" (NoArg (setDynFlag Opt_WarnIsError))
1529 , Flag "Wwarn" (NoArg (unSetDynFlag Opt_WarnIsError))
1531 , Flag "Wall" (NoArg (mapM_ setDynFlag minusWallOpts))
1533 , Flag "Wnot" (NoArg (mapM_ unSetDynFlag minusWallOpts))
1534 (Deprecated "Use -w instead")
1535 , Flag "w" (NoArg (mapM_ unSetDynFlag minuswRemovesOpts))
1538 ------ Optimisation flags ------------------------------------------
1539 , Flag "O" (NoArg (upd (setOptLevel 1))) Supported
1540 , Flag "Onot" (NoArg (upd (setOptLevel 0)))
1541 (Deprecated "Use -O0 instead")
1542 , Flag "Odph" (NoArg (upd setDPHOpt)) Supported
1543 , Flag "O" (OptIntSuffix (\mb_n -> upd (setOptLevel (mb_n `orElse` 1))))
1545 -- If the number is missing, use 1
1547 , Flag "fsimplifier-phases"
1548 (IntSuffix (\n -> upd (\dfs -> dfs{ simplPhases = n })))
1550 , Flag "fmax-simplifier-iterations"
1551 (IntSuffix (\n -> upd (\dfs -> dfs{ maxSimplIterations = n })))
1554 , Flag "fspec-constr-threshold"
1555 (IntSuffix (\n -> upd (\dfs -> dfs{ specConstrThreshold = Just n })))
1557 , Flag "fno-spec-constr-threshold"
1558 (NoArg (upd (\dfs -> dfs{ specConstrThreshold = Nothing })))
1560 , Flag "fspec-constr-count"
1561 (IntSuffix (\n -> upd (\dfs -> dfs{ specConstrCount = Just n })))
1563 , Flag "fno-spec-constr-count"
1564 (NoArg (upd (\dfs -> dfs{ specConstrCount = Nothing })))
1566 , Flag "fliberate-case-threshold"
1567 (IntSuffix (\n -> upd (\dfs -> dfs{ liberateCaseThreshold = Just n })))
1569 , Flag "fno-liberate-case-threshold"
1570 (NoArg (upd (\dfs -> dfs{ liberateCaseThreshold = Nothing })))
1573 , Flag "frule-check"
1574 (SepArg (\s -> upd (\dfs -> dfs{ ruleCheck = Just s })))
1576 , Flag "fcontext-stack"
1577 (IntSuffix $ \n -> upd $ \dfs -> dfs{ ctxtStkDepth = n })
1580 , Flag "fstrictness-before"
1581 (IntSuffix (\n -> upd (\dfs -> dfs{ strictnessBefore = n : strictnessBefore dfs })))
1584 ------ Profiling ----------------------------------------------------
1586 -- XXX Should the -f* flags be deprecated?
1587 -- They don't seem to be documented
1588 , Flag "fauto-sccs-on-all-toplevs"
1589 (NoArg (setDynFlag Opt_AutoSccsOnAllToplevs))
1592 (NoArg (setDynFlag Opt_AutoSccsOnAllToplevs))
1594 , Flag "no-auto-all"
1595 (NoArg (unSetDynFlag Opt_AutoSccsOnAllToplevs))
1597 , Flag "fauto-sccs-on-exported-toplevs"
1598 (NoArg (setDynFlag Opt_AutoSccsOnExportedToplevs))
1601 (NoArg (setDynFlag Opt_AutoSccsOnExportedToplevs))
1604 (NoArg (unSetDynFlag Opt_AutoSccsOnExportedToplevs))
1606 , Flag "fauto-sccs-on-individual-cafs"
1607 (NoArg (setDynFlag Opt_AutoSccsOnIndividualCafs))
1610 (NoArg (setDynFlag Opt_AutoSccsOnIndividualCafs))
1613 (NoArg (unSetDynFlag Opt_AutoSccsOnIndividualCafs))
1616 ------ DPH flags ----------------------------------------------------
1619 (NoArg (setDPHBackend DPHSeq))
1622 (NoArg (setDPHBackend DPHPar))
1625 (NoArg (setDPHBackend DPHThis))
1628 ------ Compiler flags -----------------------------------------------
1630 , Flag "fasm" (NoArg (setObjTarget HscAsm)) Supported
1631 , Flag "fvia-c" (NoArg (setObjTarget HscC)) Supported
1632 , Flag "fvia-C" (NoArg (setObjTarget HscC)) Supported
1634 , Flag "fno-code" (NoArg (setTarget HscNothing)) Supported
1635 , Flag "fbyte-code" (NoArg (setTarget HscInterpreted)) Supported
1636 , Flag "fobject-code" (NoArg (setTarget defaultHscTarget)) Supported
1638 , Flag "fglasgow-exts" (NoArg (mapM_ setDynFlag glasgowExtsFlags))
1640 , Flag "fno-glasgow-exts" (NoArg (mapM_ unSetDynFlag glasgowExtsFlags))
1643 ++ map (mkFlag True "f" setDynFlag ) fFlags
1644 ++ map (mkFlag False "fno-" unSetDynFlag) fFlags
1645 ++ map (mkFlag True "X" setDynFlag ) xFlags
1646 ++ map (mkFlag False "XNo" unSetDynFlag) xFlags
1648 package_flags :: [Flag DynP]
1650 ------- Packages ----------------------------------------------------
1651 Flag "package-conf" (HasArg extraPkgConf_) Supported
1652 , Flag "no-user-package-conf" (NoArg (unSetDynFlag Opt_ReadUserPackageConf))
1654 , Flag "package-name" (HasArg (upd . setPackageName)) Supported
1655 , Flag "package-id" (HasArg exposePackageId) Supported
1656 , Flag "package" (HasArg exposePackage) Supported
1657 , Flag "hide-package" (HasArg hidePackage) Supported
1658 , Flag "hide-all-packages" (NoArg (setDynFlag Opt_HideAllPackages))
1660 , Flag "ignore-package" (HasArg ignorePackage)
1662 , Flag "syslib" (HasArg exposePackage)
1663 (Deprecated "Use -package instead")
1666 mkFlag :: Bool -- ^ True <=> it should be turned on
1667 -> String -- ^ The flag prefix
1668 -> (DynFlag -> DynP ())
1669 -> (String, DynFlag, Bool -> Deprecated)
1671 mkFlag turnOn flagPrefix f (name, dynflag, deprecated)
1672 = Flag (flagPrefix ++ name) (NoArg (f dynflag)) (deprecated turnOn)
1674 deprecatedForLanguage :: String -> Bool -> Deprecated
1675 deprecatedForLanguage lang turn_on
1676 = Deprecated ("use -X" ++ flag ++ " or pragma {-# LANGUAGE " ++ flag ++ " #-} instead")
1678 flag | turn_on = lang
1679 | otherwise = "No"++lang
1681 useInstead :: String -> Bool -> Deprecated
1682 useInstead flag turn_on
1683 = Deprecated ("Use -f" ++ no ++ flag ++ " instead")
1685 no = if turn_on then "" else "no-"
1687 -- | These @-f\<blah\>@ flags can all be reversed with @-fno-\<blah\>@
1688 fFlags :: [(String, DynFlag, Bool -> Deprecated)]
1690 ( "warn-dodgy-foreign-imports", Opt_WarnDodgyForeignImports, const Supported ),
1691 ( "warn-dodgy-exports", Opt_WarnDodgyExports, const Supported ),
1692 ( "warn-dodgy-imports", Opt_WarnDodgyImports, const Supported ),
1693 ( "warn-duplicate-exports", Opt_WarnDuplicateExports, const Supported ),
1694 ( "warn-hi-shadowing", Opt_WarnHiShadows, const Supported ),
1695 ( "warn-implicit-prelude", Opt_WarnImplicitPrelude, const Supported ),
1696 ( "warn-incomplete-patterns", Opt_WarnIncompletePatterns, const Supported ),
1697 ( "warn-incomplete-record-updates", Opt_WarnIncompletePatternsRecUpd, const Supported ),
1698 ( "warn-missing-fields", Opt_WarnMissingFields, const Supported ),
1699 ( "warn-missing-methods", Opt_WarnMissingMethods, const Supported ),
1700 ( "warn-missing-signatures", Opt_WarnMissingSigs, const Supported ),
1701 ( "warn-name-shadowing", Opt_WarnNameShadowing, const Supported ),
1702 ( "warn-overlapping-patterns", Opt_WarnOverlappingPatterns, const Supported ),
1703 ( "warn-simple-patterns", Opt_WarnSimplePatterns, const Supported ),
1704 ( "warn-type-defaults", Opt_WarnTypeDefaults, const Supported ),
1705 ( "warn-monomorphism-restriction", Opt_WarnMonomorphism, const Supported ),
1706 ( "warn-unused-binds", Opt_WarnUnusedBinds, const Supported ),
1707 ( "warn-unused-imports", Opt_WarnUnusedImports, const Supported ),
1708 ( "warn-unused-matches", Opt_WarnUnusedMatches, const Supported ),
1709 ( "warn-warnings-deprecations", Opt_WarnWarningsDeprecations, const Supported ),
1710 ( "warn-deprecations", Opt_WarnWarningsDeprecations, const Supported ),
1711 ( "warn-deprecated-flags", Opt_WarnDeprecatedFlags, const Supported ),
1712 ( "warn-orphans", Opt_WarnOrphans, const Supported ),
1713 ( "warn-tabs", Opt_WarnTabs, const Supported ),
1714 ( "warn-unrecognised-pragmas", Opt_WarnUnrecognisedPragmas, const Supported ),
1715 ( "warn-lazy-unlifted-bindings", Opt_WarnLazyUnliftedBindings,
1716 const $ Deprecated "lazy unlifted bindings will be an error in GHC 6.14, and this flag will no longer exist"),
1717 ( "warn-unused-do-bind", Opt_WarnUnusedDoBind, const Supported ),
1718 ( "warn-wrong-do-bind", Opt_WarnWrongDoBind, const Supported ),
1719 ( "print-explicit-foralls", Opt_PrintExplicitForalls, const Supported ),
1720 ( "strictness", Opt_Strictness, const Supported ),
1721 ( "specialise", Opt_Specialise, const Supported ),
1722 ( "float-in", Opt_FloatIn, const Supported ),
1723 ( "static-argument-transformation", Opt_StaticArgumentTransformation, const Supported ),
1724 ( "full-laziness", Opt_FullLaziness, const Supported ),
1725 ( "liberate-case", Opt_LiberateCase, const Supported ),
1726 ( "spec-constr", Opt_SpecConstr, const Supported ),
1727 ( "cse", Opt_CSE, const Supported ),
1728 ( "ignore-interface-pragmas", Opt_IgnoreInterfacePragmas, const Supported ),
1729 ( "omit-interface-pragmas", Opt_OmitInterfacePragmas, const Supported ),
1730 ( "expose-all-unfoldings", Opt_ExposeAllUnfoldings, const Supported ),
1731 ( "do-lambda-eta-expansion", Opt_DoLambdaEtaExpansion, const Supported ),
1732 ( "ignore-asserts", Opt_IgnoreAsserts, const Supported ),
1733 ( "do-eta-reduction", Opt_DoEtaReduction, const Supported ),
1734 ( "case-merge", Opt_CaseMerge, const Supported ),
1735 ( "unbox-strict-fields", Opt_UnboxStrictFields, const Supported ),
1736 ( "method-sharing", Opt_MethodSharing, const Supported ),
1737 ( "dicts-cheap", Opt_DictsCheap, const Supported ),
1738 ( "excess-precision", Opt_ExcessPrecision, const Supported ),
1739 ( "eager-blackholing", Opt_EagerBlackHoling, const Supported ),
1740 ( "asm-mangling", Opt_DoAsmMangling, const Supported ),
1741 ( "print-bind-result", Opt_PrintBindResult, const Supported ),
1742 ( "force-recomp", Opt_ForceRecomp, const Supported ),
1743 ( "hpc-no-auto", Opt_Hpc_No_Auto, const Supported ),
1744 ( "rewrite-rules", Opt_EnableRewriteRules, useInstead "enable-rewrite-rules" ),
1745 ( "enable-rewrite-rules", Opt_EnableRewriteRules, const Supported ),
1746 ( "break-on-exception", Opt_BreakOnException, const Supported ),
1747 ( "break-on-error", Opt_BreakOnError, const Supported ),
1748 ( "print-evld-with-show", Opt_PrintEvldWithShow, const Supported ),
1749 ( "print-bind-contents", Opt_PrintBindContents, const Supported ),
1750 ( "run-cps", Opt_RunCPS, const Supported ),
1751 ( "run-cpsz", Opt_RunCPSZ, const Supported ),
1752 ( "new-codegen", Opt_TryNewCodeGen, const Supported ),
1753 ( "convert-to-zipper-and-back", Opt_ConvertToZipCfgAndBack, const Supported ),
1754 ( "vectorise", Opt_Vectorise, const Supported ),
1755 ( "regs-graph", Opt_RegsGraph, const Supported ),
1756 ( "regs-iterative", Opt_RegsIterative, const Supported ),
1757 ( "th", Opt_TemplateHaskell,
1758 deprecatedForLanguage "TemplateHaskell" ),
1759 ( "fi", Opt_ForeignFunctionInterface,
1760 deprecatedForLanguage "ForeignFunctionInterface" ),
1761 ( "ffi", Opt_ForeignFunctionInterface,
1762 deprecatedForLanguage "ForeignFunctionInterface" ),
1763 ( "arrows", Opt_Arrows,
1764 deprecatedForLanguage "Arrows" ),
1765 ( "generics", Opt_Generics,
1766 deprecatedForLanguage "Generics" ),
1767 ( "implicit-prelude", Opt_ImplicitPrelude,
1768 deprecatedForLanguage "ImplicitPrelude" ),
1769 ( "bang-patterns", Opt_BangPatterns,
1770 deprecatedForLanguage "BangPatterns" ),
1771 ( "monomorphism-restriction", Opt_MonomorphismRestriction,
1772 deprecatedForLanguage "MonomorphismRestriction" ),
1773 ( "mono-pat-binds", Opt_MonoPatBinds,
1774 deprecatedForLanguage "MonoPatBinds" ),
1775 ( "extended-default-rules", Opt_ExtendedDefaultRules,
1776 deprecatedForLanguage "ExtendedDefaultRules" ),
1777 ( "implicit-params", Opt_ImplicitParams,
1778 deprecatedForLanguage "ImplicitParams" ),
1779 ( "scoped-type-variables", Opt_ScopedTypeVariables,
1780 deprecatedForLanguage "ScopedTypeVariables" ),
1782 deprecatedForLanguage "PArr" ),
1783 ( "allow-overlapping-instances", Opt_OverlappingInstances,
1784 deprecatedForLanguage "OverlappingInstances" ),
1785 ( "allow-undecidable-instances", Opt_UndecidableInstances,
1786 deprecatedForLanguage "UndecidableInstances" ),
1787 ( "allow-incoherent-instances", Opt_IncoherentInstances,
1788 deprecatedForLanguage "IncoherentInstances" ),
1789 ( "gen-manifest", Opt_GenManifest, const Supported ),
1790 ( "embed-manifest", Opt_EmbedManifest, const Supported ),
1791 ( "ext-core", Opt_EmitExternalCore, const Supported ),
1792 ( "shared-implib", Opt_SharedImplib, const Supported ),
1793 ( "building-cabal-package", Opt_BuildingCabalPackage, const Supported ),
1794 ( "implicit-import-qualified", Opt_ImplicitImportQualified, const Supported )
1797 supportedLanguages :: [String]
1798 supportedLanguages = [ name | (name, _, _) <- xFlags ]
1800 -- This may contain duplicates
1801 languageOptions :: [DynFlag]
1802 languageOptions = [ dynFlag | (_, dynFlag, _) <- xFlags ]
1804 -- | These -X<blah> flags can all be reversed with -XNo<blah>
1805 xFlags :: [(String, DynFlag, Bool -> Deprecated)]
1807 ( "CPP", Opt_Cpp, const Supported ),
1808 ( "PostfixOperators", Opt_PostfixOperators, const Supported ),
1809 ( "TupleSections", Opt_TupleSections, const Supported ),
1810 ( "PatternGuards", Opt_PatternGuards, const Supported ),
1811 ( "UnicodeSyntax", Opt_UnicodeSyntax, const Supported ),
1812 ( "MagicHash", Opt_MagicHash, const Supported ),
1813 ( "PolymorphicComponents", Opt_PolymorphicComponents, const Supported ),
1814 ( "ExistentialQuantification", Opt_ExistentialQuantification, const Supported ),
1815 ( "KindSignatures", Opt_KindSignatures, const Supported ),
1816 ( "EmptyDataDecls", Opt_EmptyDataDecls, const Supported ),
1817 ( "ParallelListComp", Opt_ParallelListComp, const Supported ),
1818 ( "TransformListComp", Opt_TransformListComp, const Supported ),
1819 ( "ForeignFunctionInterface", Opt_ForeignFunctionInterface, const Supported ),
1820 ( "UnliftedFFITypes", Opt_UnliftedFFITypes, const Supported ),
1821 ( "GHCForeignImportPrim", Opt_GHCForeignImportPrim, const Supported ),
1822 ( "LiberalTypeSynonyms", Opt_LiberalTypeSynonyms, const Supported ),
1823 ( "Rank2Types", Opt_Rank2Types, const Supported ),
1824 ( "RankNTypes", Opt_RankNTypes, const Supported ),
1825 ( "ImpredicativeTypes", Opt_ImpredicativeTypes,
1826 const $ Deprecated "impredicative polymorphism will be simplified or removed in GHC 6.14" ),
1827 ( "TypeOperators", Opt_TypeOperators, const Supported ),
1828 ( "RecursiveDo", Opt_RecursiveDo,
1829 deprecatedForLanguage "DoRec"),
1830 ( "DoRec", Opt_DoRec, const Supported ),
1831 ( "Arrows", Opt_Arrows, const Supported ),
1832 ( "PArr", Opt_PArr, const Supported ),
1833 ( "TemplateHaskell", Opt_TemplateHaskell, const Supported ),
1834 ( "QuasiQuotes", Opt_QuasiQuotes, const Supported ),
1835 ( "Generics", Opt_Generics, const Supported ),
1837 ( "ImplicitPrelude", Opt_ImplicitPrelude, const Supported ),
1838 ( "RecordWildCards", Opt_RecordWildCards, const Supported ),
1839 ( "NamedFieldPuns", Opt_RecordPuns, const Supported ),
1840 ( "RecordPuns", Opt_RecordPuns,
1841 deprecatedForLanguage "NamedFieldPuns" ),
1842 ( "DisambiguateRecordFields", Opt_DisambiguateRecordFields, const Supported ),
1843 ( "OverloadedStrings", Opt_OverloadedStrings, const Supported ),
1844 ( "GADTs", Opt_GADTs, const Supported ),
1845 ( "ViewPatterns", Opt_ViewPatterns, const Supported ),
1846 ( "TypeFamilies", Opt_TypeFamilies, const Supported ),
1847 ( "BangPatterns", Opt_BangPatterns, const Supported ),
1849 ( "MonomorphismRestriction", Opt_MonomorphismRestriction, const Supported ),
1851 ( "NPlusKPatterns", Opt_NPlusKPatterns, const Supported ),
1852 -- On by default (which is not strictly H98):
1853 ( "MonoPatBinds", Opt_MonoPatBinds, const Supported ),
1854 ( "ExplicitForAll", Opt_ExplicitForAll, const Supported ),
1855 ( "MonoLocalBinds", Opt_MonoLocalBinds, const Supported ),
1856 ( "RelaxedPolyRec", Opt_RelaxedPolyRec, const Supported ),
1857 ( "ExtendedDefaultRules", Opt_ExtendedDefaultRules, const Supported ),
1858 ( "ImplicitParams", Opt_ImplicitParams, const Supported ),
1859 ( "ScopedTypeVariables", Opt_ScopedTypeVariables, const Supported ),
1861 ( "PatternSignatures", Opt_ScopedTypeVariables,
1862 deprecatedForLanguage "ScopedTypeVariables" ),
1864 ( "UnboxedTuples", Opt_UnboxedTuples, const Supported ),
1865 ( "StandaloneDeriving", Opt_StandaloneDeriving, const Supported ),
1866 ( "DeriveDataTypeable", Opt_DeriveDataTypeable, const Supported ),
1867 ( "DeriveFunctor", Opt_DeriveFunctor, const Supported ),
1868 ( "DeriveTraversable", Opt_DeriveTraversable, const Supported ),
1869 ( "DeriveFoldable", Opt_DeriveFoldable, const Supported ),
1870 ( "TypeSynonymInstances", Opt_TypeSynonymInstances, const Supported ),
1871 ( "FlexibleContexts", Opt_FlexibleContexts, const Supported ),
1872 ( "FlexibleInstances", Opt_FlexibleInstances, const Supported ),
1873 ( "ConstrainedClassMethods", Opt_ConstrainedClassMethods, const Supported ),
1874 ( "MultiParamTypeClasses", Opt_MultiParamTypeClasses, const Supported ),
1875 ( "FunctionalDependencies", Opt_FunctionalDependencies, const Supported ),
1876 ( "GeneralizedNewtypeDeriving", Opt_GeneralizedNewtypeDeriving, const Supported ),
1877 ( "OverlappingInstances", Opt_OverlappingInstances, const Supported ),
1878 ( "UndecidableInstances", Opt_UndecidableInstances, const Supported ),
1879 ( "IncoherentInstances", Opt_IncoherentInstances, const Supported ),
1880 ( "PackageImports", Opt_PackageImports, const Supported ),
1881 ( "NewQualifiedOperators", Opt_NewQualifiedOperators, const Supported )
1884 impliedFlags :: [(DynFlag, DynFlag)]
1886 = [ (Opt_RankNTypes, Opt_ExplicitForAll)
1887 , (Opt_Rank2Types, Opt_ExplicitForAll)
1888 , (Opt_ScopedTypeVariables, Opt_ExplicitForAll)
1889 , (Opt_LiberalTypeSynonyms, Opt_ExplicitForAll)
1890 , (Opt_ExistentialQuantification, Opt_ExplicitForAll)
1891 , (Opt_PolymorphicComponents, Opt_ExplicitForAll)
1893 , (Opt_GADTs, Opt_RelaxedPolyRec) -- We want type-sig variables to
1894 -- be completely rigid for GADTs
1896 , (Opt_TypeFamilies, Opt_RelaxedPolyRec) -- Trac #2944 gives a nice example
1897 , (Opt_TypeFamilies, Opt_KindSignatures) -- Type families use kind signatures
1898 -- all over the place
1900 , (Opt_ScopedTypeVariables, Opt_RelaxedPolyRec) -- Ditto for scoped type variables; see
1901 -- Note [Scoped tyvars] in TcBinds
1902 , (Opt_ImpredicativeTypes, Opt_RankNTypes)
1904 -- Record wild-cards implies field disambiguation
1905 -- Otherwise if you write (C {..}) you may well get
1906 -- stuff like " 'a' not in scope ", which is a bit silly
1907 -- if the compiler has just filled in field 'a' of constructor 'C'
1908 , (Opt_RecordWildCards, Opt_DisambiguateRecordFields)
1911 glasgowExtsFlags :: [DynFlag]
1912 glasgowExtsFlags = [
1913 Opt_PrintExplicitForalls
1914 , Opt_ForeignFunctionInterface
1915 , Opt_UnliftedFFITypes
1917 , Opt_ImplicitParams
1918 , Opt_ScopedTypeVariables
1920 , Opt_TypeSynonymInstances
1921 , Opt_StandaloneDeriving
1922 , Opt_DeriveDataTypeable
1924 , Opt_DeriveFoldable
1925 , Opt_DeriveTraversable
1926 , Opt_FlexibleContexts
1927 , Opt_FlexibleInstances
1928 , Opt_ConstrainedClassMethods
1929 , Opt_MultiParamTypeClasses
1930 , Opt_FunctionalDependencies
1932 , Opt_PolymorphicComponents
1933 , Opt_ExistentialQuantification
1935 , Opt_PostfixOperators
1937 , Opt_LiberalTypeSynonyms
1941 , Opt_ParallelListComp
1942 , Opt_EmptyDataDecls
1943 , Opt_KindSignatures
1944 , Opt_GeneralizedNewtypeDeriving
1945 , Opt_TypeFamilies ]
1947 -- -----------------------------------------------------------------------------
1948 -- Parsing the dynamic flags.
1950 -- | Parse dynamic flags from a list of command line arguments. Returns the
1951 -- the parsed 'DynFlags', the left-over arguments, and a list of warnings.
1952 -- Throws a 'UsageError' if errors occurred during parsing (such as unknown
1953 -- flags or missing arguments).
1954 parseDynamicFlags :: Monad m =>
1955 DynFlags -> [Located String]
1956 -> m (DynFlags, [Located String], [Located String])
1957 -- ^ Updated 'DynFlags', left-over arguments, and
1958 -- list of warnings.
1959 parseDynamicFlags dflags args = parseDynamicFlags_ dflags args True
1961 -- | Like 'parseDynamicFlags' but does not allow the package flags (-package,
1962 -- -hide-package, -ignore-package, -hide-all-packages, -package-conf).
1963 parseDynamicNoPackageFlags :: Monad m =>
1964 DynFlags -> [Located String]
1965 -> m (DynFlags, [Located String], [Located String])
1966 -- ^ Updated 'DynFlags', left-over arguments, and
1967 -- list of warnings.
1968 parseDynamicNoPackageFlags dflags args = parseDynamicFlags_ dflags args False
1970 parseDynamicFlags_ :: Monad m =>
1971 DynFlags -> [Located String] -> Bool
1972 -> m (DynFlags, [Located String], [Located String])
1973 parseDynamicFlags_ dflags0 args pkg_flags = do
1974 -- XXX Legacy support code
1975 -- We used to accept things like
1976 -- optdep-f -optdepdepend
1977 -- optdep-f -optdep depend
1978 -- optdep -f -optdepdepend
1979 -- optdep -f -optdep depend
1980 -- but the spaces trip up proper argument handling. So get rid of them.
1981 let f (L p "-optdep" : L _ x : xs) = (L p ("-optdep" ++ x)) : f xs
1982 f (x : xs) = x : f xs
1986 -- Note: -ignore-package (package_flags) must precede -i* (dynamic_flags)
1987 flag_spec | pkg_flags = package_flags ++ dynamic_flags
1988 | otherwise = dynamic_flags
1990 let ((leftover, errs, warns), dflags1)
1991 = runCmdLine (processArgs flag_spec args') dflags0
1992 when (not (null errs)) $ ghcError $ errorsToGhcException errs
1994 -- Cannot use -fPIC with registerised -fvia-C, because the mangler
1995 -- isn't up to the job. We know that if hscTarget == HscC, then the
1996 -- user has explicitly used -fvia-C, because -fasm is the default,
1997 -- unless there is no NCG on this platform. The latter case is
1998 -- checked when the -fPIC flag is parsed.
2000 let (pic_warns, dflags2) =
2001 if opt_PIC && hscTarget dflags1 == HscC && cGhcUnregisterised == "NO"
2002 then ([L noSrcSpan $ "Warning: -fvia-C is incompatible with -fPIC; ignoring -fvia-C"],
2003 dflags1{ hscTarget = HscAsm })
2006 return (dflags2, leftover, pic_warns ++ warns)
2008 type DynP = CmdLineP DynFlags
2010 upd :: (DynFlags -> DynFlags) -> DynP ()
2012 dfs <- getCmdLineState
2013 putCmdLineState $! (f dfs)
2015 --------------------------
2016 setDynFlag, unSetDynFlag :: DynFlag -> DynP ()
2017 setDynFlag f = do { upd (\dfs -> dopt_set dfs f)
2018 ; mapM_ setDynFlag deps }
2020 deps = [ d | (f', d) <- impliedFlags, f' == f ]
2021 -- When you set f, set the ones it implies
2022 -- NB: use setDynFlag recursively, in case the implied flags
2023 -- implies further flags
2024 -- When you un-set f, however, we don't un-set the things it implies
2025 -- (except for -fno-glasgow-exts, which is treated specially)
2027 unSetDynFlag f = upd (\dfs -> dopt_unset dfs f)
2029 --------------------------
2030 setDumpFlag :: DynFlag -> OptKind DynP
2031 setDumpFlag dump_flag
2032 = NoArg (do { setDynFlag dump_flag
2033 ; when want_recomp forceRecompile })
2035 -- Certain dumpy-things are really interested in what's going
2036 -- on during recompilation checking, so in those cases we
2037 -- don't want to turn it off.
2038 want_recomp = dump_flag `notElem` [Opt_D_dump_if_trace,
2039 Opt_D_dump_hi_diffs]
2041 forceRecompile :: DynP ()
2042 -- Whenver we -ddump, force recompilation (by switching off the
2043 -- recompilation checker), else you don't see the dump! However,
2044 -- don't switch it off in --make mode, else *everything* gets
2045 -- recompiled which probably isn't what you want
2046 forceRecompile = do { dfs <- getCmdLineState
2047 ; when (force_recomp dfs) (setDynFlag Opt_ForceRecomp) }
2049 force_recomp dfs = isOneShot (ghcMode dfs)
2051 setVerboseCore2Core :: DynP ()
2052 setVerboseCore2Core = do setDynFlag Opt_D_verbose_core2core
2054 upd (\s -> s { shouldDumpSimplPhase = const True })
2056 setDumpSimplPhases :: String -> DynP ()
2057 setDumpSimplPhases s = do forceRecompile
2058 upd (\s -> s { shouldDumpSimplPhase = spec })
2060 spec :: SimplifierMode -> Bool
2062 . map (join (&&) . map match . split ':')
2068 join :: (Bool -> Bool -> Bool)
2069 -> [SimplifierMode -> Bool]
2070 -> SimplifierMode -> Bool
2071 join _ [] = const True
2072 join op ss = foldr1 (\f g x -> f x `op` g x) ss
2074 match :: String -> SimplifierMode -> Bool
2075 match "" = const True
2076 match s = case reads s of
2077 [(n,"")] -> phase_num n
2080 phase_num :: Int -> SimplifierMode -> Bool
2081 phase_num n (SimplPhase k _) = n == k
2082 phase_num _ _ = False
2084 phase_name :: String -> SimplifierMode -> Bool
2085 phase_name s (SimplGently {}) = s == "gentle"
2086 phase_name s (SimplPhase { sm_names = ss }) = s `elem` ss
2088 setVerbosity :: Maybe Int -> DynP ()
2089 setVerbosity mb_n = upd (\dfs -> dfs{ verbosity = mb_n `orElse` 3 })
2091 addCmdlineHCInclude :: String -> DynP ()
2092 addCmdlineHCInclude a = upd (\s -> s{cmdlineHcIncludes = a : cmdlineHcIncludes s})
2094 extraPkgConf_ :: FilePath -> DynP ()
2095 extraPkgConf_ p = upd (\s -> s{ extraPkgConfs = p : extraPkgConfs s })
2097 exposePackage, exposePackageId, hidePackage, ignorePackage :: String -> DynP ()
2099 upd (\s -> s{ packageFlags = ExposePackage p : packageFlags s })
2101 upd (\s -> s{ packageFlags = ExposePackageId p : packageFlags s })
2103 upd (\s -> s{ packageFlags = HidePackage p : packageFlags s })
2105 upd (\s -> s{ packageFlags = IgnorePackage p : packageFlags s })
2107 setPackageName :: String -> DynFlags -> DynFlags
2108 setPackageName p s = s{ thisPackage = stringToPackageId p }
2110 -- If we're linking a binary, then only targets that produce object
2111 -- code are allowed (requests for other target types are ignored).
2112 setTarget :: HscTarget -> DynP ()
2113 setTarget l = upd set
2116 | ghcLink dfs /= LinkBinary || isObjectTarget l = dfs{ hscTarget = l }
2119 -- Changes the target only if we're compiling object code. This is
2120 -- used by -fasm and -fvia-C, which switch from one to the other, but
2121 -- not from bytecode to object-code. The idea is that -fasm/-fvia-C
2122 -- can be safely used in an OPTIONS_GHC pragma.
2123 setObjTarget :: HscTarget -> DynP ()
2124 setObjTarget l = upd set
2127 | isObjectTarget (hscTarget dfs) = dfs { hscTarget = l }
2130 setOptLevel :: Int -> DynFlags -> DynFlags
2131 setOptLevel n dflags
2132 | hscTarget dflags == HscInterpreted && n > 0
2134 -- not in IO any more, oh well:
2135 -- putStr "warning: -O conflicts with --interactive; -O ignored.\n"
2137 = updOptLevel n dflags
2140 -- -Odph is equivalent to
2142 -- -O2 optimise as much as possible
2143 -- -fno-method-sharing sharing specialisation defeats fusion
2145 -- -fdicts-cheap always inline dictionaries
2146 -- -fmax-simplifier-iterations20 this is necessary sometimes
2147 -- -fsimplifier-phases=3 we use an additional simplifier phase
2149 -- -fno-spec-constr-threshold run SpecConstr even for big loops
2150 -- -fno-spec-constr-count SpecConstr as much as possible
2151 -- -finline-enough-args hack to prevent excessive inlining
2153 setDPHOpt :: DynFlags -> DynFlags
2154 setDPHOpt dflags = setOptLevel 2 (dflags { maxSimplIterations = 20
2156 , specConstrThreshold = Nothing
2157 , specConstrCount = Nothing
2159 `dopt_set` Opt_DictsCheap
2160 `dopt_unset` Opt_MethodSharing
2162 data DPHBackend = DPHPar
2165 deriving(Eq, Ord, Enum, Show)
2167 setDPHBackend :: DPHBackend -> DynP ()
2168 setDPHBackend backend
2170 upd $ \dflags -> dflags { dphBackend = backend }
2171 mapM_ exposePackage (dph_packages backend)
2173 dph_packages DPHThis = []
2174 dph_packages DPHPar = ["dph-prim-par", "dph-par"]
2175 dph_packages DPHSeq = ["dph-prim-seq", "dph-seq"]
2177 dphPackage :: DynFlags -> PackageId
2178 dphPackage dflags = case dphBackend dflags of
2179 DPHPar -> dphParPackageId
2180 DPHSeq -> dphSeqPackageId
2181 DPHThis -> thisPackage dflags
2183 setMainIs :: String -> DynP ()
2185 | not (null main_fn) && isLower (head main_fn)
2186 -- The arg looked like "Foo.Bar.baz"
2187 = upd $ \d -> d{ mainFunIs = Just main_fn,
2188 mainModIs = mkModule mainPackageId (mkModuleName main_mod) }
2190 | isUpper (head arg) -- The arg looked like "Foo" or "Foo.Bar"
2191 = upd $ \d -> d{ mainModIs = mkModule mainPackageId (mkModuleName arg) }
2193 | otherwise -- The arg looked like "baz"
2194 = upd $ \d -> d{ mainFunIs = Just arg }
2196 (main_mod, main_fn) = splitLongestPrefix arg (== '.')
2198 -----------------------------------------------------------------------------
2199 -- Paths & Libraries
2201 addImportPath, addLibraryPath, addIncludePath, addFrameworkPath :: FilePath -> DynP ()
2203 -- -i on its own deletes the import paths
2204 addImportPath "" = upd (\s -> s{importPaths = []})
2205 addImportPath p = upd (\s -> s{importPaths = importPaths s ++ splitPathList p})
2209 upd (\s -> s{libraryPaths = libraryPaths s ++ splitPathList p})
2212 upd (\s -> s{includePaths = includePaths s ++ splitPathList p})
2214 addFrameworkPath p =
2215 upd (\s -> s{frameworkPaths = frameworkPaths s ++ splitPathList p})
2217 #ifndef mingw32_TARGET_OS
2218 split_marker :: Char
2219 split_marker = ':' -- not configurable (ToDo)
2222 splitPathList :: String -> [String]
2223 splitPathList s = filter notNull (splitUp s)
2224 -- empty paths are ignored: there might be a trailing
2225 -- ':' in the initial list, for example. Empty paths can
2226 -- cause confusion when they are translated into -I options
2227 -- for passing to gcc.
2229 #ifndef mingw32_TARGET_OS
2230 splitUp xs = split split_marker xs
2232 -- Windows: 'hybrid' support for DOS-style paths in directory lists.
2234 -- That is, if "foo:bar:baz" is used, this interpreted as
2235 -- consisting of three entries, 'foo', 'bar', 'baz'.
2236 -- However, with "c:/foo:c:\\foo;x:/bar", this is interpreted
2237 -- as 3 elts, "c:/foo", "c:\\foo", "x:/bar"
2239 -- Notice that no attempt is made to fully replace the 'standard'
2240 -- split marker ':' with the Windows / DOS one, ';'. The reason being
2241 -- that this will cause too much breakage for users & ':' will
2242 -- work fine even with DOS paths, if you're not insisting on being silly.
2245 splitUp (x:':':div:xs) | div `elem` dir_markers
2246 = ((x:':':div:p): splitUp rs)
2248 (p,rs) = findNextPath xs
2249 -- we used to check for existence of the path here, but that
2250 -- required the IO monad to be threaded through the command-line
2251 -- parser which is quite inconvenient. The
2252 splitUp xs = cons p (splitUp rs)
2254 (p,rs) = findNextPath xs
2259 -- will be called either when we've consumed nought or the
2260 -- "<Drive>:/" part of a DOS path, so splitting is just a Q of
2261 -- finding the next split marker.
2263 case break (`elem` split_markers) xs of
2264 (p, _:ds) -> (p, ds)
2267 split_markers :: [Char]
2268 split_markers = [':', ';']
2270 dir_markers :: [Char]
2271 dir_markers = ['/', '\\']
2274 -- -----------------------------------------------------------------------------
2275 -- tmpDir, where we store temporary files.
2277 setTmpDir :: FilePath -> DynFlags -> DynFlags
2278 setTmpDir dir dflags = dflags{ tmpDir = normalise dir }
2279 -- we used to fix /cygdrive/c/.. on Windows, but this doesn't
2280 -- seem necessary now --SDM 7/2/2008
2282 -----------------------------------------------------------------------------
2285 setOptHpcDir :: String -> DynP ()
2286 setOptHpcDir arg = upd $ \ d -> d{hpcDir = arg}
2288 -----------------------------------------------------------------------------
2289 -- Via-C compilation stuff
2291 -- There are some options that we need to pass to gcc when compiling
2292 -- Haskell code via C, but are only supported by recent versions of
2293 -- gcc. The configure script decides which of these options we need,
2294 -- and puts them in the file "extra-gcc-opts" in $topdir, which is
2295 -- read before each via-C compilation. The advantage of having these
2296 -- in a separate file is that the file can be created at install-time
2297 -- depending on the available gcc version, and even re-generated later
2298 -- if gcc is upgraded.
2300 -- The options below are not dependent on the version of gcc, only the
2303 machdepCCOpts :: DynFlags -> ([String], -- flags for all C compilations
2304 [String]) -- for registerised HC compilations
2305 machdepCCOpts _dflags
2306 #if alpha_TARGET_ARCH
2308 #ifdef HAVE_THREADED_RTS_SUPPORT
2312 -- For now, to suppress the gcc warning "call-clobbered
2313 -- register used for global register variable", we simply
2314 -- disable all warnings altogether using the -w flag. Oh well.
2316 #elif hppa_TARGET_ARCH
2317 -- ___HPUX_SOURCE, not _HPUX_SOURCE, is #defined if -ansi!
2318 -- (very nice, but too bad the HP /usr/include files don't agree.)
2319 = ( ["-D_HPUX_SOURCE"], [] )
2321 #elif m68k_TARGET_ARCH
2322 -- -fno-defer-pop : for the .hc files, we want all the pushing/
2323 -- popping of args to routines to be explicit; if we let things
2324 -- be deferred 'til after an STGJUMP, imminent death is certain!
2326 -- -fomit-frame-pointer : *don't*
2327 -- It's better to have a6 completely tied up being a frame pointer
2328 -- rather than let GCC pick random things to do with it.
2329 -- (If we want to steal a6, then we would try to do things
2330 -- as on iX86, where we *do* steal the frame pointer [%ebp].)
2331 = ( [], ["-fno-defer-pop", "-fno-omit-frame-pointer"] )
2333 #elif i386_TARGET_ARCH
2334 -- -fno-defer-pop : basically the same game as for m68k
2336 -- -fomit-frame-pointer : *must* in .hc files; because we're stealing
2337 -- the fp (%ebp) for our register maps.
2338 = let n_regs = stolen_x86_regs _dflags
2341 #if darwin_TARGET_OS
2342 -- By default, gcc on OS X will generate SSE
2343 -- instructions, which need things 16-byte aligned,
2344 -- but we don't 16-byte align things. Thus drop
2345 -- back to generic i686 compatibility. Trac #2983.
2347 -- Since Snow Leopard (10.6), gcc defaults to x86_64.
2348 ["-march=i686", "-m32"],
2350 [ if opt_Static then "-DDONT_WANT_WIN32_DLL_SUPPORT" else ""
2354 "-fomit-frame-pointer",
2355 -- we want -fno-builtin, because when gcc inlines
2356 -- built-in functions like memcpy() it tends to
2357 -- run out of registers, requiring -monly-n-regs
2359 "-DSTOLEN_X86_REGS="++show n_regs ]
2362 #elif ia64_TARGET_ARCH
2363 = ( [], ["-fomit-frame-pointer", "-G0"] )
2365 #elif x86_64_TARGET_ARCH
2367 #if darwin_TARGET_OS
2372 ["-fomit-frame-pointer",
2373 "-fno-asynchronous-unwind-tables",
2374 -- the unwind tables are unnecessary for HC code,
2375 -- and get in the way of -split-objs. Another option
2376 -- would be to throw them away in the mangler, but this
2379 -- calling builtins like strlen() using the FFI can
2380 -- cause gcc to run out of regs, so use the external
2384 #elif sparc_TARGET_ARCH
2386 -- For now, to suppress the gcc warning "call-clobbered
2387 -- register used for global register variable", we simply
2388 -- disable all warnings altogether using the -w flag. Oh well.
2390 #elif powerpc_apple_darwin_TARGET
2392 -- Disable Apple's precompiling preprocessor. It's a great thing
2393 -- for "normal" programs, but it doesn't support register variable
2395 = ( [], ["-no-cpp-precomp"] )
2400 picCCOpts :: DynFlags -> [String]
2402 #if darwin_TARGET_OS
2403 -- Apple prefers to do things the other way round.
2404 -- PIC is on by default.
2405 -- -mdynamic-no-pic:
2406 -- Turn off PIC code generation.
2408 -- Don't generate "common" symbols - these are unwanted
2409 -- in dynamic libraries.
2412 = ["-fno-common", "-U __PIC__","-D__PIC__"]
2414 = ["-mdynamic-no-pic"]
2415 #elif mingw32_TARGET_OS
2416 -- no -fPIC for Windows
2418 = ["-U __PIC__","-D__PIC__"]
2422 | opt_PIC || not opt_Static
2423 = ["-fPIC", "-U __PIC__", "-D__PIC__"]
2428 -- -----------------------------------------------------------------------------
2432 can_split = cSplitObjs == "YES"
2434 -- -----------------------------------------------------------------------------
2437 data Printable = String String
2438 | FromDynFlags (DynFlags -> String)
2440 compilerInfo :: [(String, Printable)]
2441 compilerInfo = [("Project name", String cProjectName),
2442 ("Project version", String cProjectVersion),
2443 ("Booter version", String cBooterVersion),
2444 ("Stage", String cStage),
2445 ("Have interpreter", String cGhcWithInterpreter),
2446 ("Object splitting", String cSplitObjs),
2447 ("Have native code generator", String cGhcWithNativeCodeGen),
2448 ("Support SMP", String cGhcWithSMP),
2449 ("Unregisterised", String cGhcUnregisterised),
2450 ("Tables next to code", String cGhcEnableTablesNextToCode),
2451 ("Win32 DLLs", String cEnableWin32DLLs),
2452 ("RTS ways", String cGhcRTSWays),
2453 ("Leading underscore", String cLeadingUnderscore),
2454 ("Debug on", String (show debugIsOn)),
2455 ("LibDir", FromDynFlags topDir)