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_IgnoreInterfacePragmas
274 | Opt_OmitInterfacePragmas
275 | Opt_DoLambdaEtaExpansion
279 | Opt_UnboxStrictFields
282 | Opt_EnableRewriteRules -- Apply rewrite rules during simplification
284 | Opt_RegsGraph -- do graph coloring register allocation
285 | Opt_RegsIterative -- do iterative coalescing graph coloring register allocation
288 | Opt_AutoSccsOnAllToplevs
289 | Opt_AutoSccsOnExportedToplevs
290 | Opt_AutoSccsOnIndividualCafs
298 | Opt_ExcessPrecision
299 | Opt_EagerBlackHoling
300 | Opt_ReadUserPackageConf
304 | Opt_HideAllPackages
305 | Opt_PrintBindResult
309 | Opt_BreakOnException
311 | Opt_PrintEvldWithShow
312 | Opt_PrintBindContents
315 | Opt_EmitExternalCore
317 | Opt_BuildingCabalPackage
322 | Opt_ConvertToZipCfgAndBack
323 | Opt_AutoLinkPackages
324 | Opt_ImplicitImportQualified
333 | Opt_KeepRawTokenStream
337 -- | Contains not only a collection of 'DynFlag's but also a plethora of
338 -- information relating to the compilation of a single file or GHC session
339 data DynFlags = DynFlags {
342 coreToDo :: Maybe [CoreToDo], -- reserved for -Ofile
343 stgToDo :: Maybe [StgToDo], -- similarly
344 hscTarget :: HscTarget,
345 hscOutName :: String, -- ^ Name of the output file
346 extCoreName :: String, -- ^ Name of the .hcr output file
347 verbosity :: Int, -- ^ Verbosity level: see Note [Verbosity levels]
348 optLevel :: Int, -- ^ Optimisation level
349 simplPhases :: Int, -- ^ Number of simplifier phases
350 maxSimplIterations :: Int, -- ^ Max simplifier iterations
351 shouldDumpSimplPhase :: SimplifierMode -> Bool,
352 ruleCheck :: Maybe String,
353 strictnessBefore :: [Int], -- ^ Additional demand analysis
355 specConstrThreshold :: Maybe Int, -- ^ Threshold for SpecConstr
356 specConstrCount :: Maybe Int, -- ^ Max number of specialisations for any one function
357 liberateCaseThreshold :: Maybe Int, -- ^ Threshold for LiberateCase
359 #ifndef OMIT_NATIVE_CODEGEN
360 targetPlatform :: Platform, -- ^ The platform we're compiling for. Used by the NCG.
362 stolen_x86_regs :: Int,
363 cmdlineHcIncludes :: [String], -- ^ @\-\#includes@
364 importPaths :: [FilePath],
366 mainFunIs :: Maybe String,
367 ctxtStkDepth :: Int, -- ^ Typechecker context stack depth
369 dphBackend :: DPHBackend,
371 thisPackage :: PackageId, -- ^ name of package currently being compiled
374 ways :: [Way], -- ^ Way flags from the command line
375 buildTag :: String, -- ^ The global \"way\" (e.g. \"p\" for prof)
376 rtsBuildTag :: String, -- ^ The RTS \"way\"
378 -- For object splitting
379 splitInfo :: Maybe (String,Int),
382 objectDir :: Maybe String,
383 hiDir :: Maybe String,
384 stubDir :: Maybe String,
390 outputFile :: Maybe String,
391 outputHi :: Maybe String,
392 dynLibLoader :: DynLibLoader,
394 -- | This is set by 'DriverPipeline.runPipeline' based on where
395 -- its output is going.
396 dumpPrefix :: Maybe FilePath,
398 -- | Override the 'dumpPrefix' set by 'DriverPipeline.runPipeline'.
399 -- Set by @-ddump-file-prefix@
400 dumpPrefixForce :: Maybe FilePath,
402 includePaths :: [String],
403 libraryPaths :: [String],
404 frameworkPaths :: [String], -- used on darwin only
405 cmdlineFrameworks :: [String], -- ditto
406 tmpDir :: String, -- no trailing '/'
408 ghcUsagePath :: FilePath, -- Filled in by SysTools
409 ghciUsagePath :: FilePath, -- ditto
411 hpcDir :: String, -- ^ Path to store the .mix files
413 -- options for particular phases
421 opt_windres :: [String],
423 -- commands for particular phases
425 pgm_P :: (String,[Option]),
427 pgm_c :: (String,[Option]),
428 pgm_m :: (String,[Option]),
429 pgm_s :: (String,[Option]),
430 pgm_a :: (String,[Option]),
431 pgm_l :: (String,[Option]),
432 pgm_dll :: (String,[Option]),
434 pgm_sysman :: String,
435 pgm_windres :: String,
438 depMakefile :: FilePath,
439 depIncludePkgDeps :: Bool,
440 depExcludeMods :: [ModuleName],
441 depSuffixes :: [String],
444 extraPkgConfs :: [FilePath],
445 topDir :: FilePath, -- filled in by SysTools
446 systemPackageConfig :: FilePath, -- ditto
447 -- ^ The @-package-conf@ flags given on the command line, in the order
450 packageFlags :: [PackageFlag],
451 -- ^ The @-package@ and @-hide-package@ flags from the command-line
454 -- NB. do not modify this field, it is calculated by
455 -- Packages.initPackages and Packages.updatePackages.
456 pkgDatabase :: Maybe [PackageConfig],
457 pkgState :: PackageState,
460 -- These have to be IORefs, because the defaultCleanupHandler needs to
461 -- know what to clean when an exception happens
462 filesToClean :: IORef [FilePath],
463 dirsToClean :: IORef (FiniteMap FilePath FilePath),
468 -- | Message output action: use "ErrUtils" instead of this if you can
469 log_action :: Severity -> SrcSpan -> PprStyle -> Message -> IO (),
471 haddockOptions :: Maybe String
474 wayNames :: DynFlags -> [WayName]
475 wayNames = map wayName . ways
477 -- | The target code type of the compilation (if any).
479 -- Whenever you change the target, also make sure to set 'ghcLink' to
480 -- something sensible.
482 -- 'HscNothing' can be used to avoid generating any output, however, note
485 -- * This will not run the desugaring step, thus no warnings generated in
486 -- this step will be output. In particular, this includes warnings related
487 -- to pattern matching. You can run the desugarer manually using
488 -- 'GHC.desugarModule'.
490 -- * If a program uses Template Haskell the typechecker may try to run code
491 -- from an imported module. This will fail if no code has been generated
492 -- for this module. You can use 'GHC.needsTemplateHaskell' to detect
493 -- whether this might be the case and choose to either switch to a
494 -- different target or avoid typechecking such modules. (The latter may
495 -- preferable for security reasons.)
498 = HscC -- ^ Generate C code.
499 | HscAsm -- ^ Generate assembly using the native code generator.
500 | HscJava -- ^ Generate Java bytecode.
501 | HscInterpreted -- ^ Generate bytecode. (Requires 'LinkInMemory')
502 | HscNothing -- ^ Don't generate any code. See notes above.
505 -- | Will this target result in an object file on the disk?
506 isObjectTarget :: HscTarget -> Bool
507 isObjectTarget HscC = True
508 isObjectTarget HscAsm = True
509 isObjectTarget _ = False
511 -- | The 'GhcMode' tells us whether we're doing multi-module
512 -- compilation (controlled via the "GHC" API) or one-shot
513 -- (single-module) compilation. This makes a difference primarily to
514 -- the "Finder": in one-shot mode we look for interface files for
515 -- imported modules, but in multi-module mode we look for source files
516 -- in order to check whether they need to be recompiled.
518 = CompManager -- ^ @\-\-make@, GHCi, etc.
519 | OneShot -- ^ @ghc -c Foo.hs@
520 | MkDepend -- ^ @ghc -M@, see "Finder" for why we need this
523 instance Outputable GhcMode where
524 ppr CompManager = ptext (sLit "CompManager")
525 ppr OneShot = ptext (sLit "OneShot")
526 ppr MkDepend = ptext (sLit "MkDepend")
528 isOneShot :: GhcMode -> Bool
529 isOneShot OneShot = True
530 isOneShot _other = False
532 -- | What to do in the link step, if there is one.
534 = NoLink -- ^ Don't link at all
535 | LinkBinary -- ^ Link object code into a binary
536 | LinkInMemory -- ^ Use the in-memory dynamic linker (works for both
537 -- bytecode and object code).
538 | LinkDynLib -- ^ Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
541 isNoLink :: GhcLink -> Bool
542 isNoLink NoLink = True
545 -- Is it worth evaluating this Bool and caching it in the DynFlags value
546 -- during initDynFlags?
547 doingTickyProfiling :: DynFlags -> Bool
548 doingTickyProfiling _ = opt_Ticky
549 -- XXX -ticky is a static flag, because it implies -debug which is also
550 -- static. If the way flags were made dynamic, we could fix this.
553 = ExposePackage String
554 | ExposePackageId String
556 | IgnorePackage String
559 defaultHscTarget :: HscTarget
560 defaultHscTarget = defaultObjectTarget
562 -- | The 'HscTarget' value corresponding to the default way to create
563 -- object files on the current platform.
564 defaultObjectTarget :: HscTarget
566 | cGhcWithNativeCodeGen == "YES" = HscAsm
571 | Wrapped (Maybe String)
575 -- | Used by 'GHC.newSession' to partially initialize a new 'DynFlags' value
576 initDynFlags :: DynFlags -> IO DynFlags
577 initDynFlags dflags = do
578 -- someday these will be dynamic flags
579 ways <- readIORef v_Ways
580 refFilesToClean <- newIORef []
581 refDirsToClean <- newIORef emptyFM
584 buildTag = mkBuildTag (filter (not . wayRTSOnly) ways),
585 rtsBuildTag = mkBuildTag ways,
586 filesToClean = refFilesToClean,
587 dirsToClean = refDirsToClean
590 -- | The normal 'DynFlags'. Note that they is not suitable for use in this form
591 -- and must be fully initialized by 'GHC.newSession' first.
592 defaultDynFlags :: DynFlags
595 ghcMode = CompManager,
596 ghcLink = LinkBinary,
599 hscTarget = defaultHscTarget,
605 maxSimplIterations = 4,
606 shouldDumpSimplPhase = const False,
608 specConstrThreshold = Just 200,
609 specConstrCount = Just 3,
610 liberateCaseThreshold = Just 200,
611 strictnessBefore = [],
613 #ifndef OMIT_NATIVE_CODEGEN
614 targetPlatform = defaultTargetPlatform,
617 cmdlineHcIncludes = [],
621 ctxtStkDepth = mAX_CONTEXT_REDUCTION_DEPTH,
625 thisPackage = mainPackageId,
631 objectSuf = phaseInputExt StopLn,
632 hcSuf = phaseInputExt HCc,
635 outputFile = Nothing,
637 dynLibLoader = SystemDependent,
638 dumpPrefix = Nothing,
639 dumpPrefixForce = Nothing,
643 cmdlineFrameworks = [],
644 tmpDir = cDEFAULT_TMPDIR,
650 then ["-D__PIC__", "-U __PIC__"] -- this list is reversed
661 pkgDatabase = Nothing,
662 pkgState = panic "no package state yet: call GHC.setSessionDynFlags",
663 ways = panic "defaultDynFlags: No ways",
664 buildTag = panic "defaultDynFlags: No buildTag",
665 rtsBuildTag = panic "defaultDynFlags: No rtsBuildTag",
667 -- initSysTools fills all these in
668 ghcUsagePath = panic "defaultDynFlags: No ghciUsagePath",
669 ghciUsagePath = panic "defaultDynFlags: No ghciUsagePath",
670 topDir = panic "defaultDynFlags: No topDir",
671 systemPackageConfig = panic "no systemPackageConfig: call GHC.setSessionDynFlags",
672 pgm_L = panic "defaultDynFlags: No pgm_L",
673 pgm_P = panic "defaultDynFlags: No pgm_P",
674 pgm_F = panic "defaultDynFlags: No pgm_F",
675 pgm_c = panic "defaultDynFlags: No pgm_c",
676 pgm_m = panic "defaultDynFlags: No pgm_m",
677 pgm_s = panic "defaultDynFlags: No pgm_s",
678 pgm_a = panic "defaultDynFlags: No pgm_a",
679 pgm_l = panic "defaultDynFlags: No pgm_l",
680 pgm_dll = panic "defaultDynFlags: No pgm_dll",
681 pgm_T = panic "defaultDynFlags: No pgm_T",
682 pgm_sysman = panic "defaultDynFlags: No pgm_sysman",
683 pgm_windres = panic "defaultDynFlags: No pgm_windres",
684 -- end of initSysTools values
686 depMakefile = "Makefile",
687 depIncludePkgDeps = False,
690 -- end of ghc -M values
691 filesToClean = panic "defaultDynFlags: No filesToClean",
692 dirsToClean = panic "defaultDynFlags: No dirsToClean",
693 haddockOptions = Nothing,
695 Opt_AutoLinkPackages,
696 Opt_ReadUserPackageConf,
698 Opt_MonoPatBinds, -- Experimentally, I'm making this non-standard
699 -- behaviour the default, to see if anyone notices
703 Opt_MonomorphismRestriction,
714 Opt_PrintBindContents
716 ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
717 -- The default -O0 options
720 log_action = \severity srcSpan style msg ->
722 SevInfo -> printErrs (msg style)
723 SevFatal -> printErrs (msg style)
726 printErrs ((mkLocMessage srcSpan msg) style)
727 -- careful (#2302): printErrs prints in UTF-8, whereas
728 -- converting to string first and using hPutStr would
729 -- just emit the low 8 bits of each unicode char.
733 Note [Verbosity levels]
734 ~~~~~~~~~~~~~~~~~~~~~~~
735 0 | print errors & warnings only
736 1 | minimal verbosity: print "compiling M ... done." for each module.
737 2 | equivalent to -dshow-passes
738 3 | equivalent to existing "ghc -v"
739 4 | "ghc -v -ddump-most"
740 5 | "ghc -v -ddump-all"
743 -- | Test whether a 'DynFlag' is set
744 dopt :: DynFlag -> DynFlags -> Bool
745 dopt f dflags = f `elem` (flags dflags)
748 dopt_set :: DynFlags -> DynFlag -> DynFlags
749 dopt_set dfs f = dfs{ flags = f : flags dfs }
751 -- | Unset a 'DynFlag'
752 dopt_unset :: DynFlags -> DynFlag -> DynFlags
753 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
755 -- | Retrieve the options corresponding to a particular @opt_*@ field in the correct order
756 getOpts :: DynFlags -- ^ 'DynFlags' to retrieve the options from
757 -> (DynFlags -> [a]) -- ^ Relevant record accessor: one of the @opt_*@ accessors
758 -> [a] -- ^ Correctly ordered extracted options
759 getOpts dflags opts = reverse (opts dflags)
760 -- We add to the options from the front, so we need to reverse the list
762 -- | Gets the verbosity flag for the current verbosity level. This is fed to
763 -- other tools, so GHC-specific verbosity flags like @-ddump-most@ are not included
764 getVerbFlag :: DynFlags -> String
766 | verbosity dflags >= 3 = "-v"
769 setObjectDir, setHiDir, setStubDir, setOutputDir,
770 setObjectSuf, setHiSuf, setHcSuf, parseDynLibLoaderMode,
771 setPgmP, setPgmL, setPgmF, setPgmc, setPgmm, setPgms, setPgma, setPgml, setPgmdll, setPgmwindres,
772 addOptL, addOptP, addOptF, addOptc, addOptm, addOpta, addOptl, addOptwindres,
773 addCmdlineFramework, addHaddockOpts
774 :: String -> DynFlags -> DynFlags
775 setOutputFile, setOutputHi, setDumpPrefixForce
776 :: Maybe String -> DynFlags -> DynFlags
778 setObjectDir f d = d{ objectDir = Just f}
779 setHiDir f d = d{ hiDir = Just f}
780 setStubDir f d = d{ stubDir = Just f, includePaths = f : includePaths d }
781 -- -stubdir D adds an implicit -I D, so that gcc can find the _stub.h file
782 -- \#included from the .hc file when compiling with -fvia-C.
783 setOutputDir f = setObjectDir f . setHiDir f . setStubDir f
785 setObjectSuf f d = d{ objectSuf = f}
786 setHiSuf f d = d{ hiSuf = f}
787 setHcSuf f d = d{ hcSuf = f}
789 setOutputFile f d = d{ outputFile = f}
790 setOutputHi f d = d{ outputHi = f}
792 parseDynLibLoaderMode f d =
794 ("deploy", "") -> d{ dynLibLoader = Deployable }
795 ("sysdep", "") -> d{ dynLibLoader = SystemDependent }
796 ("wrapped", "") -> d{ dynLibLoader = Wrapped Nothing }
797 ("wrapped:", "hard") -> d{ dynLibLoader = Wrapped Nothing }
798 ("wrapped:", flex) -> d{ dynLibLoader = Wrapped (Just flex) }
799 _ -> ghcError (CmdLineError ("Unknown dynlib loader: " ++ f))
801 setDumpPrefixForce f d = d { dumpPrefixForce = f}
803 -- XXX HACK: Prelude> words "'does not' work" ===> ["'does","not'","work"]
804 -- Config.hs should really use Option.
805 setPgmP f d = let (pgm:args) = words f in d{ pgm_P = (pgm, map Option args)}
807 setPgmL f d = d{ pgm_L = f}
808 setPgmF f d = d{ pgm_F = f}
809 setPgmc f d = d{ pgm_c = (f,[])}
810 setPgmm f d = d{ pgm_m = (f,[])}
811 setPgms f d = d{ pgm_s = (f,[])}
812 setPgma f d = d{ pgm_a = (f,[])}
813 setPgml f d = d{ pgm_l = (f,[])}
814 setPgmdll f d = d{ pgm_dll = (f,[])}
815 setPgmwindres f d = d{ pgm_windres = f}
817 addOptL f d = d{ opt_L = f : opt_L d}
818 addOptP f d = d{ opt_P = f : opt_P d}
819 addOptF f d = d{ opt_F = f : opt_F d}
820 addOptc f d = d{ opt_c = f : opt_c d}
821 addOptm f d = d{ opt_m = f : opt_m d}
822 addOpta f d = d{ opt_a = f : opt_a d}
823 addOptl f d = d{ opt_l = f : opt_l d}
824 addOptwindres f d = d{ opt_windres = f : opt_windres d}
826 setDepMakefile :: FilePath -> DynFlags -> DynFlags
827 setDepMakefile f d = d { depMakefile = deOptDep f }
829 setDepIncludePkgDeps :: Bool -> DynFlags -> DynFlags
830 setDepIncludePkgDeps b d = d { depIncludePkgDeps = b }
832 addDepExcludeMod :: String -> DynFlags -> DynFlags
834 = d { depExcludeMods = mkModuleName (deOptDep m) : depExcludeMods d }
836 addDepSuffix :: FilePath -> DynFlags -> DynFlags
837 addDepSuffix s d = d { depSuffixes = deOptDep s : depSuffixes d }
840 -- We used to use "-optdep-flag -optdeparg", so for legacy applications
841 -- we need to strip the "-optdep" off of the arg
842 deOptDep :: String -> String
843 deOptDep x = case stripPrefix "-optdep" x of
847 addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}
849 addHaddockOpts f d = d{ haddockOptions = Just f}
851 -- -----------------------------------------------------------------------------
852 -- Command-line options
854 -- | When invoking external tools as part of the compilation pipeline, we
855 -- pass these a sequence of options on the command-line. Rather than
856 -- just using a list of Strings, we use a type that allows us to distinguish
857 -- between filepaths and 'other stuff'. The reason for this is that
858 -- this type gives us a handle on transforming filenames, and filenames only,
859 -- to whatever format they're expected to be on a particular platform.
861 = FileOption -- an entry that _contains_ filename(s) / filepaths.
862 String -- a non-filepath prefix that shouldn't be
863 -- transformed (e.g., "/out=")
864 String -- the filepath/filename portion
867 showOpt :: Option -> String
868 showOpt (FileOption pre f) = pre ++ f
869 showOpt (Option s) = s
871 -----------------------------------------------------------------------------
872 -- Setting the optimisation level
874 updOptLevel :: Int -> DynFlags -> DynFlags
875 -- ^ Sets the 'DynFlags' to be appropriate to the optimisation level
877 = dfs2{ optLevel = final_n }
879 final_n = max 0 (min 2 n) -- Clamp to 0 <= n <= 2
880 dfs1 = foldr (flip dopt_unset) dfs remove_dopts
881 dfs2 = foldr (flip dopt_set) dfs1 extra_dopts
883 extra_dopts = [ f | (ns,f) <- optLevelFlags, final_n `elem` ns ]
884 remove_dopts = [ f | (ns,f) <- optLevelFlags, final_n `notElem` ns ]
886 optLevelFlags :: [([Int], DynFlag)]
888 = [ ([0], Opt_IgnoreInterfacePragmas)
889 , ([0], Opt_OmitInterfacePragmas)
891 , ([1,2], Opt_IgnoreAsserts)
892 , ([1,2], Opt_EnableRewriteRules) -- Off for -O0; see Note [Scoping for Builtin rules]
894 , ([1,2], Opt_DoEtaReduction)
895 , ([1,2], Opt_CaseMerge)
896 , ([1,2], Opt_Strictness)
898 , ([1,2], Opt_FullLaziness)
899 , ([1,2], Opt_Specialise)
900 , ([1,2], Opt_FloatIn)
902 , ([2], Opt_LiberateCase)
903 , ([2], Opt_SpecConstr)
905 -- , ([2], Opt_StaticArgumentTransformation)
906 -- Max writes: I think it's probably best not to enable SAT with -O2 for the
907 -- 6.10 release. The version of SAT in HEAD at the moment doesn't incorporate
908 -- several improvements to the heuristics, and I'm concerned that without
909 -- those changes SAT will interfere with some attempts to write "high
910 -- performance Haskell", as we saw in some posts on Haskell-Cafe earlier
911 -- this year. In particular, the version in HEAD lacks the tail call
912 -- criterion, so many things that look like reasonable loops will be
913 -- turned into functions with extra (unneccesary) thunk creation.
915 , ([0,1,2], Opt_DoLambdaEtaExpansion)
916 -- This one is important for a tiresome reason:
917 -- we want to make sure that the bindings for data
918 -- constructors are eta-expanded. This is probably
919 -- a good thing anyway, but it seems fragile.
922 -- -----------------------------------------------------------------------------
923 -- Standard sets of warning options
925 standardWarnings :: [DynFlag]
927 = [ Opt_WarnWarningsDeprecations,
928 Opt_WarnDeprecatedFlags,
929 Opt_WarnUnrecognisedPragmas,
930 Opt_WarnOverlappingPatterns,
931 Opt_WarnMissingFields,
932 Opt_WarnMissingMethods,
933 Opt_WarnDuplicateExports,
934 Opt_WarnLazyUnliftedBindings,
935 Opt_WarnDodgyForeignImports,
939 minusWOpts :: [DynFlag]
941 = standardWarnings ++
942 [ Opt_WarnUnusedBinds,
943 Opt_WarnUnusedMatches,
944 Opt_WarnUnusedImports,
945 Opt_WarnIncompletePatterns,
946 Opt_WarnDodgyExports,
950 minusWallOpts :: [DynFlag]
953 [ Opt_WarnTypeDefaults,
954 Opt_WarnNameShadowing,
961 -- minuswRemovesOpts should be every warning option
962 minuswRemovesOpts :: [DynFlag]
965 [Opt_WarnImplicitPrelude,
966 Opt_WarnIncompletePatternsRecUpd,
967 Opt_WarnSimplePatterns,
968 Opt_WarnMonomorphism,
969 Opt_WarnUnrecognisedPragmas,
973 -- -----------------------------------------------------------------------------
974 -- CoreToDo: abstraction of core-to-core passes to run.
976 data CoreToDo -- These are diff core-to-core passes,
977 -- which may be invoked in any order,
978 -- as many times as you like.
980 = CoreDoSimplify -- The core-to-core simplifier.
983 -- Each run of the simplifier can take a different
984 -- set of simplifier-specific flags.
986 | CoreDoFloatOutwards FloatOutSwitches
991 | CoreDoWorkerWrapper
994 | CoreDoOldStrictness
997 | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
998 -- matching this string
999 | CoreDoVectorisation PackageId
1000 | CoreDoNothing -- Useful when building up
1001 | CoreDoPasses [CoreToDo] -- lists of these things
1004 data SimplifierMode -- See comments in SimplMonad
1006 { sm_rules :: Bool -- Whether RULES are enabled
1007 , sm_inline :: Bool } -- Whether inlining is enabled
1010 { sm_num :: Int -- Phase number; counts downward so 0 is last phase
1011 , sm_names :: [String] } -- Name(s) of the phase
1013 instance Outputable SimplifierMode where
1014 ppr (SimplPhase { sm_num = n, sm_names = ss })
1015 = int n <+> brackets (text (concat $ intersperse "," ss))
1016 ppr (SimplGently { sm_rules = r, sm_inline = i })
1017 = ptext (sLit "gentle") <>
1018 brackets (pp_flag r (sLit "rules") <> comma <>
1019 pp_flag i (sLit "inline"))
1021 pp_flag f s = ppUnless f (ptext (sLit "no")) <+> ptext s
1023 data SimplifierSwitch
1024 = MaxSimplifierIterations Int
1027 data FloatOutSwitches = FloatOutSwitches {
1028 floatOutLambdas :: Bool, -- ^ True <=> float lambdas to top level
1029 floatOutConstants :: Bool -- ^ True <=> float constants to top level,
1030 -- even if they do not escape a lambda
1033 instance Outputable FloatOutSwitches where
1034 ppr = pprFloatOutSwitches
1036 pprFloatOutSwitches :: FloatOutSwitches -> SDoc
1037 pprFloatOutSwitches sw = pp_not (floatOutLambdas sw) <+> text "lambdas" <> comma
1038 <+> pp_not (floatOutConstants sw) <+> text "constants"
1041 pp_not False = text "not"
1043 -- | Switches that specify the minimum amount of floating out
1044 -- gentleFloatOutSwitches :: FloatOutSwitches
1045 -- gentleFloatOutSwitches = FloatOutSwitches False False
1047 -- | Switches that do not specify floating out of lambdas, just of constants
1048 constantsOnlyFloatOutSwitches :: FloatOutSwitches
1049 constantsOnlyFloatOutSwitches = FloatOutSwitches False True
1052 -- The core-to-core pass ordering is derived from the DynFlags:
1053 runWhen :: Bool -> CoreToDo -> CoreToDo
1054 runWhen True do_this = do_this
1055 runWhen False _ = CoreDoNothing
1057 runMaybe :: Maybe a -> (a -> CoreToDo) -> CoreToDo
1058 runMaybe (Just x) f = f x
1059 runMaybe Nothing _ = CoreDoNothing
1061 getCoreToDo :: DynFlags -> [CoreToDo]
1063 | Just todo <- coreToDo dflags = todo -- set explicitly by user
1064 | otherwise = core_todo
1066 opt_level = optLevel dflags
1067 phases = simplPhases dflags
1068 max_iter = maxSimplIterations dflags
1069 strictness = dopt Opt_Strictness dflags
1070 full_laziness = dopt Opt_FullLaziness dflags
1071 do_specialise = dopt Opt_Specialise dflags
1072 do_float_in = dopt Opt_FloatIn dflags
1073 cse = dopt Opt_CSE dflags
1074 spec_constr = dopt Opt_SpecConstr dflags
1075 liberate_case = dopt Opt_LiberateCase dflags
1076 rule_check = ruleCheck dflags
1077 static_args = dopt Opt_StaticArgumentTransformation dflags
1079 maybe_rule_check phase = runMaybe rule_check (CoreDoRuleCheck phase)
1081 maybe_strictness_before phase
1082 = runWhen (phase `elem` strictnessBefore dflags) CoreDoStrictness
1084 simpl_phase phase names iter
1086 [ maybe_strictness_before phase,
1087 CoreDoSimplify (SimplPhase phase names) [
1088 MaxSimplifierIterations iter
1090 maybe_rule_check phase
1094 = runWhen (dopt Opt_Vectorise dflags)
1095 $ CoreDoPasses [ simpl_gently, CoreDoVectorisation (dphPackage dflags) ]
1098 -- By default, we have 2 phases before phase 0.
1100 -- Want to run with inline phase 2 after the specialiser to give
1101 -- maximum chance for fusion to work before we inline build/augment
1102 -- in phase 1. This made a difference in 'ansi' where an
1103 -- overloaded function wasn't inlined till too late.
1105 -- Need phase 1 so that build/augment get
1106 -- inlined. I found that spectral/hartel/genfft lost some useful
1107 -- strictness in the function sumcode' if augment is not inlined
1108 -- before strictness analysis runs
1109 simpl_phases = CoreDoPasses [ simpl_phase phase ["main"] max_iter
1110 | phase <- [phases, phases-1 .. 1] ]
1113 -- initial simplify: mk specialiser happy: minimum effort please
1114 simpl_gently = CoreDoSimplify
1115 (SimplGently { sm_rules = True, sm_inline = False })
1117 -- Simplify "gently"
1118 -- Don't inline anything till full laziness has bitten
1119 -- In particular, inlining wrappers inhibits floating
1120 -- e.g. ...(case f x of ...)...
1121 -- ==> ...(case (case x of I# x# -> fw x#) of ...)...
1122 -- ==> ...(case x of I# x# -> case fw x# of ...)...
1123 -- and now the redex (f x) isn't floatable any more
1124 -- Similarly, don't apply any rules until after full
1125 -- laziness. Notably, list fusion can prevent floating.
1127 NoCaseOfCase, -- Don't do case-of-case transformations.
1128 -- This makes full laziness work better
1129 MaxSimplifierIterations max_iter
1133 if opt_level == 0 then
1135 simpl_phase 0 ["final"] max_iter]
1136 else {- opt_level >= 1 -} [
1138 -- We want to do the static argument transform before full laziness as it
1139 -- may expose extra opportunities to float things outwards. However, to fix
1140 -- up the output of the transformation we need at do at least one simplify
1141 -- after this before anything else
1142 runWhen static_args (CoreDoPasses [ simpl_gently, CoreDoStaticArgs ]),
1144 -- We run vectorisation here for now, but we might also try to run
1148 -- initial simplify: mk specialiser happy: minimum effort please
1151 -- Specialisation is best done before full laziness
1152 -- so that overloaded functions have all their dictionary lambdas manifest
1153 runWhen do_specialise CoreDoSpecialising,
1155 runWhen full_laziness (CoreDoFloatOutwards constantsOnlyFloatOutSwitches),
1156 -- Was: gentleFloatOutSwitches
1157 -- I have no idea why, but not floating constants to top level is
1158 -- very bad in some cases.
1159 -- Notably: p_ident in spectral/rewrite
1160 -- Changing from "gentle" to "constantsOnly" improved
1161 -- rewrite's allocation by 19%, and made 0.0% difference
1162 -- to any other nofib benchmark
1164 runWhen do_float_in CoreDoFloatInwards,
1168 -- Phase 0: allow all Ids to be inlined now
1169 -- This gets foldr inlined before strictness analysis
1171 -- At least 3 iterations because otherwise we land up with
1172 -- huge dead expressions because of an infelicity in the
1174 -- let k = BIG in foldr k z xs
1175 -- ==> let k = BIG in letrec go = \xs -> ...(k x).... in go xs
1176 -- ==> let k = BIG in letrec go = \xs -> ...(BIG x).... in go xs
1178 simpl_phase 0 ["main"] (max max_iter 3),
1181 #ifdef OLD_STRICTNESS
1182 CoreDoOldStrictness,
1184 runWhen strictness (CoreDoPasses [
1186 CoreDoWorkerWrapper,
1188 simpl_phase 0 ["post-worker-wrapper"] max_iter
1191 runWhen full_laziness
1192 (CoreDoFloatOutwards constantsOnlyFloatOutSwitches),
1193 -- nofib/spectral/hartel/wang doubles in speed if you
1194 -- do full laziness late in the day. It only happens
1195 -- after fusion and other stuff, so the early pass doesn't
1196 -- catch it. For the record, the redex is
1197 -- f_el22 (f_el21 r_midblock)
1200 runWhen cse CoreCSE,
1201 -- We want CSE to follow the final full-laziness pass, because it may
1202 -- succeed in commoning up things floated out by full laziness.
1203 -- CSE used to rely on the no-shadowing invariant, but it doesn't any more
1205 runWhen do_float_in CoreDoFloatInwards,
1209 -- Case-liberation for -O2. This should be after
1210 -- strictness analysis and the simplification which follows it.
1211 runWhen liberate_case (CoreDoPasses [
1213 simpl_phase 0 ["post-liberate-case"] max_iter
1214 ]), -- Run the simplifier after LiberateCase to vastly
1215 -- reduce the possiblility of shadowing
1216 -- Reason: see Note [Shadowing] in SpecConstr.lhs
1218 runWhen spec_constr CoreDoSpecConstr,
1222 -- Final clean-up simplification:
1223 simpl_phase 0 ["final"] max_iter
1226 -- -----------------------------------------------------------------------------
1227 -- StgToDo: abstraction of stg-to-stg passes to run.
1230 = StgDoMassageForProfiling -- should be (next to) last
1231 -- There's also setStgVarInfo, but its absolute "lastness"
1232 -- is so critical that it is hardwired in (no flag).
1235 getStgToDo :: DynFlags -> [StgToDo]
1237 | Just todo <- stgToDo dflags = todo -- set explicitly by user
1240 stg_stats = dopt Opt_StgStats dflags
1242 todo1 = if stg_stats then [D_stg_stats] else []
1244 todo2 | WayProf `elem` wayNames dflags
1245 = StgDoMassageForProfiling : todo1
1249 -- -----------------------------------------------------------------------------
1252 allFlags :: [String]
1253 allFlags = map ('-':) $
1254 [ flagName flag | flag <- dynamic_flags, ok (flagOptKind flag) ] ++
1255 map ("fno-"++) flags ++
1256 map ("f"++) flags ++
1257 map ("X"++) supportedLanguages ++
1258 map ("XNo"++) supportedLanguages
1259 where ok (PrefixPred _ _) = False
1261 flags = [ name | (name, _, _) <- fFlags ]
1263 dynamic_flags :: [Flag DynP]
1265 Flag "n" (NoArg (setDynFlag Opt_DryRun)) Supported
1266 , Flag "cpp" (NoArg (setDynFlag Opt_Cpp)) Supported
1267 , Flag "F" (NoArg (setDynFlag Opt_Pp)) Supported
1268 , Flag "#include" (HasArg (addCmdlineHCInclude))
1269 (Deprecated "No longer has any effect")
1270 , Flag "v" (OptIntSuffix setVerbosity) Supported
1272 ------- Specific phases --------------------------------------------
1273 , Flag "pgmL" (HasArg (upd . setPgmL)) Supported
1274 , Flag "pgmP" (HasArg (upd . setPgmP)) Supported
1275 , Flag "pgmF" (HasArg (upd . setPgmF)) Supported
1276 , Flag "pgmc" (HasArg (upd . setPgmc)) Supported
1277 , Flag "pgmm" (HasArg (upd . setPgmm)) Supported
1278 , Flag "pgms" (HasArg (upd . setPgms)) Supported
1279 , Flag "pgma" (HasArg (upd . setPgma)) Supported
1280 , Flag "pgml" (HasArg (upd . setPgml)) Supported
1281 , Flag "pgmdll" (HasArg (upd . setPgmdll)) Supported
1282 , Flag "pgmwindres" (HasArg (upd . setPgmwindres)) Supported
1284 , Flag "optL" (HasArg (upd . addOptL)) Supported
1285 , Flag "optP" (HasArg (upd . addOptP)) Supported
1286 , Flag "optF" (HasArg (upd . addOptF)) Supported
1287 , Flag "optc" (HasArg (upd . addOptc)) Supported
1288 , Flag "optm" (HasArg (upd . addOptm)) Supported
1289 , Flag "opta" (HasArg (upd . addOpta)) Supported
1290 , Flag "optl" (HasArg (upd . addOptl)) Supported
1291 , Flag "optwindres" (HasArg (upd . addOptwindres)) Supported
1294 (NoArg (if can_split then setDynFlag Opt_SplitObjs else return ()))
1297 -------- ghc -M -----------------------------------------------------
1298 , Flag "dep-suffix" (HasArg (upd . addDepSuffix)) Supported
1299 , Flag "optdep-s" (HasArg (upd . addDepSuffix))
1300 (Deprecated "Use -dep-suffix instead")
1301 , Flag "dep-makefile" (HasArg (upd . setDepMakefile)) Supported
1302 , Flag "optdep-f" (HasArg (upd . setDepMakefile))
1303 (Deprecated "Use -dep-makefile instead")
1304 , Flag "optdep-w" (NoArg (return ()))
1305 (Deprecated "-optdep-w doesn't do anything")
1306 , Flag "include-pkg-deps" (NoArg (upd (setDepIncludePkgDeps True))) Supported
1307 , Flag "optdep--include-prelude" (NoArg (upd (setDepIncludePkgDeps True)))
1308 (Deprecated "Use -include-pkg-deps instead")
1309 , Flag "optdep--include-pkg-deps" (NoArg (upd (setDepIncludePkgDeps True)))
1310 (Deprecated "Use -include-pkg-deps instead")
1311 , Flag "exclude-module" (HasArg (upd . addDepExcludeMod)) Supported
1312 , Flag "optdep--exclude-module" (HasArg (upd . addDepExcludeMod))
1313 (Deprecated "Use -exclude-module instead")
1314 , Flag "optdep-x" (HasArg (upd . addDepExcludeMod))
1315 (Deprecated "Use -exclude-module instead")
1317 -------- Linking ----------------------------------------------------
1318 , Flag "c" (NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
1320 , Flag "no-link" (NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
1321 (Deprecated "Use -c instead")
1322 , Flag "shared" (NoArg (upd $ \d -> d{ ghcLink=LinkDynLib } ))
1324 , Flag "dynload" (HasArg (upd . parseDynLibLoaderMode))
1327 ------- Libraries ---------------------------------------------------
1328 , Flag "L" (Prefix addLibraryPath ) Supported
1329 , Flag "l" (AnySuffix (\s -> do upd (addOptl s))) Supported
1331 ------- Frameworks --------------------------------------------------
1332 -- -framework-path should really be -F ...
1333 , Flag "framework-path" (HasArg addFrameworkPath ) Supported
1334 , Flag "framework" (HasArg (upd . addCmdlineFramework)) Supported
1336 ------- Output Redirection ------------------------------------------
1337 , Flag "odir" (HasArg (upd . setObjectDir)) Supported
1338 , Flag "o" (SepArg (upd . setOutputFile . Just)) Supported
1339 , Flag "ohi" (HasArg (upd . setOutputHi . Just )) Supported
1340 , Flag "osuf" (HasArg (upd . setObjectSuf)) Supported
1341 , Flag "hcsuf" (HasArg (upd . setHcSuf)) Supported
1342 , Flag "hisuf" (HasArg (upd . setHiSuf)) Supported
1343 , Flag "hidir" (HasArg (upd . setHiDir)) Supported
1344 , Flag "tmpdir" (HasArg (upd . setTmpDir)) Supported
1345 , Flag "stubdir" (HasArg (upd . setStubDir)) Supported
1346 , Flag "outputdir" (HasArg (upd . setOutputDir)) Supported
1347 , Flag "ddump-file-prefix" (HasArg (upd . setDumpPrefixForce . Just))
1350 ------- Keeping temporary files -------------------------------------
1351 -- These can be singular (think ghc -c) or plural (think ghc --make)
1352 , Flag "keep-hc-file" (NoArg (setDynFlag Opt_KeepHcFiles)) Supported
1353 , Flag "keep-hc-files" (NoArg (setDynFlag Opt_KeepHcFiles)) Supported
1354 , Flag "keep-s-file" (NoArg (setDynFlag Opt_KeepSFiles)) Supported
1355 , Flag "keep-s-files" (NoArg (setDynFlag Opt_KeepSFiles)) Supported
1356 , Flag "keep-raw-s-file" (NoArg (setDynFlag Opt_KeepRawSFiles)) Supported
1357 , Flag "keep-raw-s-files" (NoArg (setDynFlag Opt_KeepRawSFiles)) Supported
1358 -- This only makes sense as plural
1359 , Flag "keep-tmp-files" (NoArg (setDynFlag Opt_KeepTmpFiles)) Supported
1361 ------- Miscellaneous ----------------------------------------------
1362 , Flag "no-auto-link-packages" (NoArg (unSetDynFlag Opt_AutoLinkPackages)) Supported
1363 , Flag "no-hs-main" (NoArg (setDynFlag Opt_NoHsMain)) Supported
1364 , Flag "main-is" (SepArg setMainIs ) Supported
1365 , Flag "haddock" (NoArg (setDynFlag Opt_Haddock)) Supported
1366 , Flag "haddock-opts" (HasArg (upd . addHaddockOpts)) Supported
1367 , Flag "hpcdir" (SepArg setOptHpcDir) Supported
1369 ------- recompilation checker --------------------------------------
1370 , Flag "recomp" (NoArg (unSetDynFlag Opt_ForceRecomp))
1371 (Deprecated "Use -fno-force-recomp instead")
1372 , Flag "no-recomp" (NoArg (setDynFlag Opt_ForceRecomp))
1373 (Deprecated "Use -fforce-recomp instead")
1375 ------ HsCpp opts ---------------------------------------------------
1376 , Flag "D" (AnySuffix (upd . addOptP)) Supported
1377 , Flag "U" (AnySuffix (upd . addOptP)) Supported
1379 ------- Include/Import Paths ----------------------------------------
1380 , Flag "I" (Prefix addIncludePath) Supported
1381 , Flag "i" (OptPrefix addImportPath ) Supported
1383 ------ Debugging ----------------------------------------------------
1384 , Flag "dstg-stats" (NoArg (setDynFlag Opt_StgStats)) Supported
1386 , Flag "ddump-cmm" (setDumpFlag Opt_D_dump_cmm)
1388 , Flag "ddump-cmmz" (setDumpFlag Opt_D_dump_cmmz)
1390 , Flag "ddump-cmmz-pretty" (setDumpFlag Opt_D_dump_cmmz_pretty)
1392 , Flag "ddump-cps-cmm" (setDumpFlag Opt_D_dump_cps_cmm)
1394 , Flag "ddump-cvt-cmm" (setDumpFlag Opt_D_dump_cvt_cmm)
1396 , Flag "ddump-asm" (setDumpFlag Opt_D_dump_asm)
1398 , Flag "ddump-asm-native" (setDumpFlag Opt_D_dump_asm_native)
1400 , Flag "ddump-asm-liveness" (setDumpFlag Opt_D_dump_asm_liveness)
1402 , Flag "ddump-asm-coalesce" (setDumpFlag Opt_D_dump_asm_coalesce)
1404 , Flag "ddump-asm-regalloc" (setDumpFlag Opt_D_dump_asm_regalloc)
1406 , Flag "ddump-asm-conflicts" (setDumpFlag Opt_D_dump_asm_conflicts)
1408 , Flag "ddump-asm-regalloc-stages"
1409 (setDumpFlag Opt_D_dump_asm_regalloc_stages)
1411 , Flag "ddump-asm-stats" (setDumpFlag Opt_D_dump_asm_stats)
1413 , Flag "ddump-asm-expanded" (setDumpFlag Opt_D_dump_asm_expanded)
1415 , Flag "ddump-cpranal" (setDumpFlag Opt_D_dump_cpranal)
1417 , Flag "ddump-deriv" (setDumpFlag Opt_D_dump_deriv)
1419 , Flag "ddump-ds" (setDumpFlag Opt_D_dump_ds)
1421 , Flag "ddump-flatC" (setDumpFlag Opt_D_dump_flatC)
1423 , Flag "ddump-foreign" (setDumpFlag Opt_D_dump_foreign)
1425 , Flag "ddump-inlinings" (setDumpFlag Opt_D_dump_inlinings)
1427 , Flag "ddump-rule-firings" (setDumpFlag Opt_D_dump_rule_firings)
1429 , Flag "ddump-occur-anal" (setDumpFlag Opt_D_dump_occur_anal)
1431 , Flag "ddump-parsed" (setDumpFlag Opt_D_dump_parsed)
1433 , Flag "ddump-rn" (setDumpFlag Opt_D_dump_rn)
1435 , Flag "ddump-simpl" (setDumpFlag Opt_D_dump_simpl)
1437 , Flag "ddump-simpl-iterations" (setDumpFlag Opt_D_dump_simpl_iterations)
1439 , Flag "ddump-simpl-phases" (OptPrefix setDumpSimplPhases)
1441 , Flag "ddump-spec" (setDumpFlag Opt_D_dump_spec)
1443 , Flag "ddump-prep" (setDumpFlag Opt_D_dump_prep)
1445 , Flag "ddump-stg" (setDumpFlag Opt_D_dump_stg)
1447 , Flag "ddump-stranal" (setDumpFlag Opt_D_dump_stranal)
1449 , Flag "ddump-tc" (setDumpFlag Opt_D_dump_tc)
1451 , Flag "ddump-types" (setDumpFlag Opt_D_dump_types)
1453 , Flag "ddump-rules" (setDumpFlag Opt_D_dump_rules)
1455 , Flag "ddump-cse" (setDumpFlag Opt_D_dump_cse)
1457 , Flag "ddump-worker-wrapper" (setDumpFlag Opt_D_dump_worker_wrapper)
1459 , Flag "ddump-rn-trace" (setDumpFlag Opt_D_dump_rn_trace)
1461 , Flag "ddump-if-trace" (setDumpFlag Opt_D_dump_if_trace)
1463 , Flag "ddump-tc-trace" (setDumpFlag Opt_D_dump_tc_trace)
1465 , Flag "ddump-splices" (setDumpFlag Opt_D_dump_splices)
1467 , Flag "ddump-rn-stats" (setDumpFlag Opt_D_dump_rn_stats)
1469 , Flag "ddump-opt-cmm" (setDumpFlag Opt_D_dump_opt_cmm)
1471 , Flag "ddump-simpl-stats" (setDumpFlag Opt_D_dump_simpl_stats)
1473 , Flag "ddump-bcos" (setDumpFlag Opt_D_dump_BCOs)
1475 , Flag "dsource-stats" (setDumpFlag Opt_D_source_stats)
1477 , Flag "dverbose-core2core" (NoArg (do { setVerbosity (Just 2)
1478 ; setVerboseCore2Core }))
1480 , Flag "dverbose-stg2stg" (setDumpFlag Opt_D_verbose_stg2stg)
1482 , Flag "ddump-hi" (setDumpFlag Opt_D_dump_hi)
1484 , Flag "ddump-minimal-imports" (setDumpFlag Opt_D_dump_minimal_imports)
1486 , Flag "ddump-vect" (setDumpFlag Opt_D_dump_vect)
1488 , Flag "ddump-hpc" (setDumpFlag Opt_D_dump_hpc)
1490 , Flag "ddump-mod-cycles" (setDumpFlag Opt_D_dump_mod_cycles)
1492 , Flag "ddump-view-pattern-commoning" (setDumpFlag Opt_D_dump_view_pattern_commoning)
1494 , Flag "ddump-to-file" (setDumpFlag Opt_DumpToFile)
1496 , Flag "ddump-hi-diffs" (setDumpFlag Opt_D_dump_hi_diffs)
1498 , Flag "ddump-rtti" (setDumpFlag Opt_D_dump_rtti)
1501 , Flag "dcore-lint" (NoArg (setDynFlag Opt_DoCoreLinting))
1503 , Flag "dstg-lint" (NoArg (setDynFlag Opt_DoStgLinting))
1505 , Flag "dcmm-lint" (NoArg (setDynFlag Opt_DoCmmLinting))
1507 , Flag "dasm-lint" (NoArg (setDynFlag Opt_DoAsmLinting))
1509 , Flag "dshow-passes"
1510 (NoArg (do forceRecompile
1511 setVerbosity (Just 2)))
1513 , Flag "dfaststring-stats" (NoArg (setDynFlag Opt_D_faststring_stats))
1516 ------ Machine dependant (-m<blah>) stuff ---------------------------
1518 , Flag "monly-2-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 2}) ))
1520 , Flag "monly-3-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 3}) ))
1522 , Flag "monly-4-regs" (NoArg (upd (\s -> s{stolen_x86_regs = 4}) ))
1525 ------ Warning opts -------------------------------------------------
1526 , Flag "W" (NoArg (mapM_ setDynFlag minusWOpts))
1528 , Flag "Werror" (NoArg (setDynFlag Opt_WarnIsError))
1530 , Flag "Wwarn" (NoArg (unSetDynFlag Opt_WarnIsError))
1532 , Flag "Wall" (NoArg (mapM_ setDynFlag minusWallOpts))
1534 , Flag "Wnot" (NoArg (mapM_ unSetDynFlag minusWallOpts))
1535 (Deprecated "Use -w instead")
1536 , Flag "w" (NoArg (mapM_ unSetDynFlag minuswRemovesOpts))
1539 ------ Optimisation flags ------------------------------------------
1540 , Flag "O" (NoArg (upd (setOptLevel 1))) Supported
1541 , Flag "Onot" (NoArg (upd (setOptLevel 0)))
1542 (Deprecated "Use -O0 instead")
1543 , Flag "Odph" (NoArg (upd setDPHOpt)) Supported
1544 , Flag "O" (OptIntSuffix (\mb_n -> upd (setOptLevel (mb_n `orElse` 1))))
1546 -- If the number is missing, use 1
1548 , Flag "fsimplifier-phases"
1549 (IntSuffix (\n -> upd (\dfs -> dfs{ simplPhases = n })))
1551 , Flag "fmax-simplifier-iterations"
1552 (IntSuffix (\n -> upd (\dfs -> dfs{ maxSimplIterations = n })))
1555 , Flag "fspec-constr-threshold"
1556 (IntSuffix (\n -> upd (\dfs -> dfs{ specConstrThreshold = Just n })))
1558 , Flag "fno-spec-constr-threshold"
1559 (NoArg (upd (\dfs -> dfs{ specConstrThreshold = Nothing })))
1561 , Flag "fspec-constr-count"
1562 (IntSuffix (\n -> upd (\dfs -> dfs{ specConstrCount = Just n })))
1564 , Flag "fno-spec-constr-count"
1565 (NoArg (upd (\dfs -> dfs{ specConstrCount = Nothing })))
1567 , Flag "fliberate-case-threshold"
1568 (IntSuffix (\n -> upd (\dfs -> dfs{ liberateCaseThreshold = Just n })))
1570 , Flag "fno-liberate-case-threshold"
1571 (NoArg (upd (\dfs -> dfs{ liberateCaseThreshold = Nothing })))
1574 , Flag "frule-check"
1575 (SepArg (\s -> upd (\dfs -> dfs{ ruleCheck = Just s })))
1577 , Flag "fcontext-stack"
1578 (IntSuffix $ \n -> upd $ \dfs -> dfs{ ctxtStkDepth = n })
1581 , Flag "fstrictness-before"
1582 (IntSuffix (\n -> upd (\dfs -> dfs{ strictnessBefore = n : strictnessBefore dfs })))
1585 ------ Profiling ----------------------------------------------------
1587 -- XXX Should the -f* flags be deprecated?
1588 -- They don't seem to be documented
1589 , Flag "fauto-sccs-on-all-toplevs"
1590 (NoArg (setDynFlag Opt_AutoSccsOnAllToplevs))
1593 (NoArg (setDynFlag Opt_AutoSccsOnAllToplevs))
1595 , Flag "no-auto-all"
1596 (NoArg (unSetDynFlag Opt_AutoSccsOnAllToplevs))
1598 , Flag "fauto-sccs-on-exported-toplevs"
1599 (NoArg (setDynFlag Opt_AutoSccsOnExportedToplevs))
1602 (NoArg (setDynFlag Opt_AutoSccsOnExportedToplevs))
1605 (NoArg (unSetDynFlag Opt_AutoSccsOnExportedToplevs))
1607 , Flag "fauto-sccs-on-individual-cafs"
1608 (NoArg (setDynFlag Opt_AutoSccsOnIndividualCafs))
1611 (NoArg (setDynFlag Opt_AutoSccsOnIndividualCafs))
1614 (NoArg (unSetDynFlag Opt_AutoSccsOnIndividualCafs))
1617 ------ DPH flags ----------------------------------------------------
1620 (NoArg (setDPHBackend DPHSeq))
1623 (NoArg (setDPHBackend DPHPar))
1626 (NoArg (setDPHBackend DPHThis))
1629 ------ Compiler flags -----------------------------------------------
1631 , Flag "fasm" (NoArg (setObjTarget HscAsm)) Supported
1632 , Flag "fvia-c" (NoArg (setObjTarget HscC)) Supported
1633 , Flag "fvia-C" (NoArg (setObjTarget HscC)) Supported
1635 , Flag "fno-code" (NoArg (setTarget HscNothing)) Supported
1636 , Flag "fbyte-code" (NoArg (setTarget HscInterpreted)) Supported
1637 , Flag "fobject-code" (NoArg (setTarget defaultHscTarget)) Supported
1639 , Flag "fglasgow-exts" (NoArg (mapM_ setDynFlag glasgowExtsFlags))
1641 , Flag "fno-glasgow-exts" (NoArg (mapM_ unSetDynFlag glasgowExtsFlags))
1644 ++ map (mkFlag True "f" setDynFlag ) fFlags
1645 ++ map (mkFlag False "fno-" unSetDynFlag) fFlags
1646 ++ map (mkFlag True "X" setDynFlag ) xFlags
1647 ++ map (mkFlag False "XNo" unSetDynFlag) xFlags
1649 package_flags :: [Flag DynP]
1651 ------- Packages ----------------------------------------------------
1652 Flag "package-conf" (HasArg extraPkgConf_) Supported
1653 , Flag "no-user-package-conf" (NoArg (unSetDynFlag Opt_ReadUserPackageConf))
1655 , Flag "package-name" (HasArg (upd . setPackageName)) Supported
1656 , Flag "package-id" (HasArg exposePackageId) Supported
1657 , Flag "package" (HasArg exposePackage) Supported
1658 , Flag "hide-package" (HasArg hidePackage) Supported
1659 , Flag "hide-all-packages" (NoArg (setDynFlag Opt_HideAllPackages))
1661 , Flag "ignore-package" (HasArg ignorePackage)
1663 , Flag "syslib" (HasArg exposePackage)
1664 (Deprecated "Use -package instead")
1667 mkFlag :: Bool -- ^ True <=> it should be turned on
1668 -> String -- ^ The flag prefix
1669 -> (DynFlag -> DynP ())
1670 -> (String, DynFlag, Bool -> Deprecated)
1672 mkFlag turnOn flagPrefix f (name, dynflag, deprecated)
1673 = Flag (flagPrefix ++ name) (NoArg (f dynflag)) (deprecated turnOn)
1675 deprecatedForLanguage :: String -> Bool -> Deprecated
1676 deprecatedForLanguage lang turn_on
1677 = Deprecated ("use -X" ++ flag ++ " or pragma {-# LANGUAGE " ++ flag ++ " #-} instead")
1679 flag | turn_on = lang
1680 | otherwise = "No"++lang
1682 useInstead :: String -> Bool -> Deprecated
1683 useInstead flag turn_on
1684 = Deprecated ("Use -f" ++ no ++ flag ++ " instead")
1686 no = if turn_on then "" else "no-"
1688 -- | These @-f\<blah\>@ flags can all be reversed with @-fno-\<blah\>@
1689 fFlags :: [(String, DynFlag, Bool -> Deprecated)]
1691 ( "warn-dodgy-foreign-imports", Opt_WarnDodgyForeignImports, const Supported ),
1692 ( "warn-dodgy-exports", Opt_WarnDodgyExports, const Supported ),
1693 ( "warn-dodgy-imports", Opt_WarnDodgyImports, const Supported ),
1694 ( "warn-duplicate-exports", Opt_WarnDuplicateExports, const Supported ),
1695 ( "warn-hi-shadowing", Opt_WarnHiShadows, const Supported ),
1696 ( "warn-implicit-prelude", Opt_WarnImplicitPrelude, const Supported ),
1697 ( "warn-incomplete-patterns", Opt_WarnIncompletePatterns, const Supported ),
1698 ( "warn-incomplete-record-updates", Opt_WarnIncompletePatternsRecUpd, const Supported ),
1699 ( "warn-missing-fields", Opt_WarnMissingFields, const Supported ),
1700 ( "warn-missing-methods", Opt_WarnMissingMethods, const Supported ),
1701 ( "warn-missing-signatures", Opt_WarnMissingSigs, const Supported ),
1702 ( "warn-name-shadowing", Opt_WarnNameShadowing, const Supported ),
1703 ( "warn-overlapping-patterns", Opt_WarnOverlappingPatterns, const Supported ),
1704 ( "warn-simple-patterns", Opt_WarnSimplePatterns, const Supported ),
1705 ( "warn-type-defaults", Opt_WarnTypeDefaults, const Supported ),
1706 ( "warn-monomorphism-restriction", Opt_WarnMonomorphism, const Supported ),
1707 ( "warn-unused-binds", Opt_WarnUnusedBinds, const Supported ),
1708 ( "warn-unused-imports", Opt_WarnUnusedImports, const Supported ),
1709 ( "warn-unused-matches", Opt_WarnUnusedMatches, const Supported ),
1710 ( "warn-warnings-deprecations", Opt_WarnWarningsDeprecations, const Supported ),
1711 ( "warn-deprecations", Opt_WarnWarningsDeprecations, const Supported ),
1712 ( "warn-deprecated-flags", Opt_WarnDeprecatedFlags, const Supported ),
1713 ( "warn-orphans", Opt_WarnOrphans, const Supported ),
1714 ( "warn-tabs", Opt_WarnTabs, const Supported ),
1715 ( "warn-unrecognised-pragmas", Opt_WarnUnrecognisedPragmas, const Supported ),
1716 ( "warn-lazy-unlifted-bindings", Opt_WarnLazyUnliftedBindings,
1717 const $ Deprecated "lazy unlifted bindings will be an error in GHC 6.14, and this flag will no longer exist"),
1718 ( "warn-unused-do-bind", Opt_WarnUnusedDoBind, const Supported ),
1719 ( "warn-wrong-do-bind", Opt_WarnWrongDoBind, const Supported ),
1720 ( "print-explicit-foralls", Opt_PrintExplicitForalls, const Supported ),
1721 ( "strictness", Opt_Strictness, const Supported ),
1722 ( "specialise", Opt_Specialise, const Supported ),
1723 ( "float-in", Opt_FloatIn, const Supported ),
1724 ( "static-argument-transformation", Opt_StaticArgumentTransformation, const Supported ),
1725 ( "full-laziness", Opt_FullLaziness, const Supported ),
1726 ( "liberate-case", Opt_LiberateCase, const Supported ),
1727 ( "spec-constr", Opt_SpecConstr, const Supported ),
1728 ( "cse", Opt_CSE, const Supported ),
1729 ( "ignore-interface-pragmas", Opt_IgnoreInterfacePragmas, const Supported ),
1730 ( "omit-interface-pragmas", Opt_OmitInterfacePragmas, 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)