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
261 | Opt_AlternativeLayoutRule
263 | Opt_PrintExplicitForalls
270 | Opt_StaticArgumentTransformation
274 | Opt_DoLambdaEtaExpansion
278 | Opt_UnboxStrictFields
281 | Opt_EnableRewriteRules -- Apply rewrite rules during simplification
283 | Opt_RegsGraph -- do graph coloring register allocation
284 | Opt_RegsIterative -- do iterative coalescing graph coloring register allocation
287 | Opt_IgnoreInterfacePragmas
288 | Opt_OmitInterfacePragmas
289 | Opt_ExposeAllUnfoldings
292 | Opt_AutoSccsOnAllToplevs
293 | Opt_AutoSccsOnExportedToplevs
294 | Opt_AutoSccsOnIndividualCafs
302 | Opt_ExcessPrecision
303 | Opt_EagerBlackHoling
304 | Opt_ReadUserPackageConf
308 | Opt_HideAllPackages
309 | Opt_PrintBindResult
313 | Opt_BreakOnException
315 | Opt_PrintEvldWithShow
316 | Opt_PrintBindContents
319 | Opt_EmitExternalCore
321 | Opt_BuildingCabalPackage
326 | Opt_ConvertToZipCfgAndBack
327 | Opt_AutoLinkPackages
328 | Opt_ImplicitImportQualified
337 | Opt_KeepRawTokenStream
341 -- | Contains not only a collection of 'DynFlag's but also a plethora of
342 -- information relating to the compilation of a single file or GHC session
343 data DynFlags = DynFlags {
346 coreToDo :: Maybe [CoreToDo], -- reserved for -Ofile
347 stgToDo :: Maybe [StgToDo], -- similarly
348 hscTarget :: HscTarget,
349 hscOutName :: String, -- ^ Name of the output file
350 extCoreName :: String, -- ^ Name of the .hcr output file
351 verbosity :: Int, -- ^ Verbosity level: see Note [Verbosity levels]
352 optLevel :: Int, -- ^ Optimisation level
353 simplPhases :: Int, -- ^ Number of simplifier phases
354 maxSimplIterations :: Int, -- ^ Max simplifier iterations
355 shouldDumpSimplPhase :: SimplifierMode -> Bool,
356 ruleCheck :: Maybe String,
357 strictnessBefore :: [Int], -- ^ Additional demand analysis
359 specConstrThreshold :: Maybe Int, -- ^ Threshold for SpecConstr
360 specConstrCount :: Maybe Int, -- ^ Max number of specialisations for any one function
361 liberateCaseThreshold :: Maybe Int, -- ^ Threshold for LiberateCase
363 #ifndef OMIT_NATIVE_CODEGEN
364 targetPlatform :: Platform, -- ^ The platform we're compiling for. Used by the NCG.
366 stolen_x86_regs :: Int,
367 cmdlineHcIncludes :: [String], -- ^ @\-\#includes@
368 importPaths :: [FilePath],
370 mainFunIs :: Maybe String,
371 ctxtStkDepth :: Int, -- ^ Typechecker context stack depth
373 dphBackend :: DPHBackend,
375 thisPackage :: PackageId, -- ^ name of package currently being compiled
378 ways :: [Way], -- ^ Way flags from the command line
379 buildTag :: String, -- ^ The global \"way\" (e.g. \"p\" for prof)
380 rtsBuildTag :: String, -- ^ The RTS \"way\"
382 -- For object splitting
383 splitInfo :: Maybe (String,Int),
386 objectDir :: Maybe String,
387 hiDir :: Maybe String,
388 stubDir :: Maybe String,
394 outputFile :: Maybe String,
395 outputHi :: Maybe String,
396 dynLibLoader :: DynLibLoader,
398 -- | This is set by 'DriverPipeline.runPipeline' based on where
399 -- its output is going.
400 dumpPrefix :: Maybe FilePath,
402 -- | Override the 'dumpPrefix' set by 'DriverPipeline.runPipeline'.
403 -- Set by @-ddump-file-prefix@
404 dumpPrefixForce :: Maybe FilePath,
406 includePaths :: [String],
407 libraryPaths :: [String],
408 frameworkPaths :: [String], -- used on darwin only
409 cmdlineFrameworks :: [String], -- ditto
410 tmpDir :: String, -- no trailing '/'
412 ghcUsagePath :: FilePath, -- Filled in by SysTools
413 ghciUsagePath :: FilePath, -- ditto
415 hpcDir :: String, -- ^ Path to store the .mix files
417 -- options for particular phases
425 opt_windres :: [String],
427 -- commands for particular phases
429 pgm_P :: (String,[Option]),
431 pgm_c :: (String,[Option]),
432 pgm_m :: (String,[Option]),
433 pgm_s :: (String,[Option]),
434 pgm_a :: (String,[Option]),
435 pgm_l :: (String,[Option]),
436 pgm_dll :: (String,[Option]),
438 pgm_sysman :: String,
439 pgm_windres :: String,
442 depMakefile :: FilePath,
443 depIncludePkgDeps :: Bool,
444 depExcludeMods :: [ModuleName],
445 depSuffixes :: [String],
448 extraPkgConfs :: [FilePath],
449 topDir :: FilePath, -- filled in by SysTools
450 systemPackageConfig :: FilePath, -- ditto
451 -- ^ The @-package-conf@ flags given on the command line, in the order
454 packageFlags :: [PackageFlag],
455 -- ^ The @-package@ and @-hide-package@ flags from the command-line
458 -- NB. do not modify this field, it is calculated by
459 -- Packages.initPackages and Packages.updatePackages.
460 pkgDatabase :: Maybe [PackageConfig],
461 pkgState :: PackageState,
464 -- These have to be IORefs, because the defaultCleanupHandler needs to
465 -- know what to clean when an exception happens
466 filesToClean :: IORef [FilePath],
467 dirsToClean :: IORef (FiniteMap FilePath FilePath),
472 -- | Message output action: use "ErrUtils" instead of this if you can
473 log_action :: Severity -> SrcSpan -> PprStyle -> Message -> IO (),
475 haddockOptions :: Maybe String
478 wayNames :: DynFlags -> [WayName]
479 wayNames = map wayName . ways
481 -- | The target code type of the compilation (if any).
483 -- Whenever you change the target, also make sure to set 'ghcLink' to
484 -- something sensible.
486 -- 'HscNothing' can be used to avoid generating any output, however, note
489 -- * This will not run the desugaring step, thus no warnings generated in
490 -- this step will be output. In particular, this includes warnings related
491 -- to pattern matching. You can run the desugarer manually using
492 -- 'GHC.desugarModule'.
494 -- * If a program uses Template Haskell the typechecker may try to run code
495 -- from an imported module. This will fail if no code has been generated
496 -- for this module. You can use 'GHC.needsTemplateHaskell' to detect
497 -- whether this might be the case and choose to either switch to a
498 -- different target or avoid typechecking such modules. (The latter may
499 -- preferable for security reasons.)
502 = HscC -- ^ Generate C code.
503 | HscAsm -- ^ Generate assembly using the native code generator.
504 | HscJava -- ^ Generate Java bytecode.
505 | HscInterpreted -- ^ Generate bytecode. (Requires 'LinkInMemory')
506 | HscNothing -- ^ Don't generate any code. See notes above.
509 -- | Will this target result in an object file on the disk?
510 isObjectTarget :: HscTarget -> Bool
511 isObjectTarget HscC = True
512 isObjectTarget HscAsm = True
513 isObjectTarget _ = False
515 -- | The 'GhcMode' tells us whether we're doing multi-module
516 -- compilation (controlled via the "GHC" API) or one-shot
517 -- (single-module) compilation. This makes a difference primarily to
518 -- the "Finder": in one-shot mode we look for interface files for
519 -- imported modules, but in multi-module mode we look for source files
520 -- in order to check whether they need to be recompiled.
522 = CompManager -- ^ @\-\-make@, GHCi, etc.
523 | OneShot -- ^ @ghc -c Foo.hs@
524 | MkDepend -- ^ @ghc -M@, see "Finder" for why we need this
527 instance Outputable GhcMode where
528 ppr CompManager = ptext (sLit "CompManager")
529 ppr OneShot = ptext (sLit "OneShot")
530 ppr MkDepend = ptext (sLit "MkDepend")
532 isOneShot :: GhcMode -> Bool
533 isOneShot OneShot = True
534 isOneShot _other = False
536 -- | What to do in the link step, if there is one.
538 = NoLink -- ^ Don't link at all
539 | LinkBinary -- ^ Link object code into a binary
540 | LinkInMemory -- ^ Use the in-memory dynamic linker (works for both
541 -- bytecode and object code).
542 | LinkDynLib -- ^ Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
545 isNoLink :: GhcLink -> Bool
546 isNoLink NoLink = True
549 -- Is it worth evaluating this Bool and caching it in the DynFlags value
550 -- during initDynFlags?
551 doingTickyProfiling :: DynFlags -> Bool
552 doingTickyProfiling _ = opt_Ticky
553 -- XXX -ticky is a static flag, because it implies -debug which is also
554 -- static. If the way flags were made dynamic, we could fix this.
557 = ExposePackage String
558 | ExposePackageId String
560 | IgnorePackage String
563 defaultHscTarget :: HscTarget
564 defaultHscTarget = defaultObjectTarget
566 -- | The 'HscTarget' value corresponding to the default way to create
567 -- object files on the current platform.
568 defaultObjectTarget :: HscTarget
570 | cGhcWithNativeCodeGen == "YES" = HscAsm
575 | Wrapped (Maybe String)
579 -- | Used by 'GHC.newSession' to partially initialize a new 'DynFlags' value
580 initDynFlags :: DynFlags -> IO DynFlags
581 initDynFlags dflags = do
582 -- someday these will be dynamic flags
583 ways <- readIORef v_Ways
584 refFilesToClean <- newIORef []
585 refDirsToClean <- newIORef emptyFM
588 buildTag = mkBuildTag (filter (not . wayRTSOnly) ways),
589 rtsBuildTag = mkBuildTag ways,
590 filesToClean = refFilesToClean,
591 dirsToClean = refDirsToClean
594 -- | The normal 'DynFlags'. Note that they is not suitable for use in this form
595 -- and must be fully initialized by 'GHC.newSession' first.
596 defaultDynFlags :: DynFlags
599 ghcMode = CompManager,
600 ghcLink = LinkBinary,
603 hscTarget = defaultHscTarget,
609 maxSimplIterations = 4,
610 shouldDumpSimplPhase = const False,
612 specConstrThreshold = Just 200,
613 specConstrCount = Just 3,
614 liberateCaseThreshold = Just 200,
615 strictnessBefore = [],
617 #ifndef OMIT_NATIVE_CODEGEN
618 targetPlatform = defaultTargetPlatform,
621 cmdlineHcIncludes = [],
625 ctxtStkDepth = mAX_CONTEXT_REDUCTION_DEPTH,
629 thisPackage = mainPackageId,
635 objectSuf = phaseInputExt StopLn,
636 hcSuf = phaseInputExt HCc,
639 outputFile = Nothing,
641 dynLibLoader = SystemDependent,
642 dumpPrefix = Nothing,
643 dumpPrefixForce = Nothing,
647 cmdlineFrameworks = [],
648 tmpDir = cDEFAULT_TMPDIR,
654 then ["-D__PIC__", "-U __PIC__"] -- this list is reversed
665 pkgDatabase = Nothing,
666 pkgState = panic "no package state yet: call GHC.setSessionDynFlags",
667 ways = panic "defaultDynFlags: No ways",
668 buildTag = panic "defaultDynFlags: No buildTag",
669 rtsBuildTag = panic "defaultDynFlags: No rtsBuildTag",
671 -- initSysTools fills all these in
672 ghcUsagePath = panic "defaultDynFlags: No ghciUsagePath",
673 ghciUsagePath = panic "defaultDynFlags: No ghciUsagePath",
674 topDir = panic "defaultDynFlags: No topDir",
675 systemPackageConfig = panic "no systemPackageConfig: call GHC.setSessionDynFlags",
676 pgm_L = panic "defaultDynFlags: No pgm_L",
677 pgm_P = panic "defaultDynFlags: No pgm_P",
678 pgm_F = panic "defaultDynFlags: No pgm_F",
679 pgm_c = panic "defaultDynFlags: No pgm_c",
680 pgm_m = panic "defaultDynFlags: No pgm_m",
681 pgm_s = panic "defaultDynFlags: No pgm_s",
682 pgm_a = panic "defaultDynFlags: No pgm_a",
683 pgm_l = panic "defaultDynFlags: No pgm_l",
684 pgm_dll = panic "defaultDynFlags: No pgm_dll",
685 pgm_T = panic "defaultDynFlags: No pgm_T",
686 pgm_sysman = panic "defaultDynFlags: No pgm_sysman",
687 pgm_windres = panic "defaultDynFlags: No pgm_windres",
688 -- end of initSysTools values
690 depMakefile = "Makefile",
691 depIncludePkgDeps = False,
694 -- end of ghc -M values
695 filesToClean = panic "defaultDynFlags: No filesToClean",
696 dirsToClean = panic "defaultDynFlags: No dirsToClean",
697 haddockOptions = Nothing,
699 Opt_AutoLinkPackages,
700 Opt_ReadUserPackageConf,
702 Opt_MonoPatBinds, -- Experimentally, I'm making this non-standard
703 -- behaviour the default, to see if anyone notices
707 Opt_MonomorphismRestriction,
718 Opt_PrintBindContents
720 ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
721 -- The default -O0 options
724 log_action = \severity srcSpan style msg ->
726 SevInfo -> printErrs (msg style)
727 SevFatal -> printErrs (msg style)
730 printErrs ((mkLocMessage srcSpan msg) style)
731 -- careful (#2302): printErrs prints in UTF-8, whereas
732 -- converting to string first and using hPutStr would
733 -- just emit the low 8 bits of each unicode char.
737 Note [Verbosity levels]
738 ~~~~~~~~~~~~~~~~~~~~~~~
739 0 | print errors & warnings only
740 1 | minimal verbosity: print "compiling M ... done." for each module.
741 2 | equivalent to -dshow-passes
742 3 | equivalent to existing "ghc -v"
743 4 | "ghc -v -ddump-most"
744 5 | "ghc -v -ddump-all"
747 -- | Test whether a 'DynFlag' is set
748 dopt :: DynFlag -> DynFlags -> Bool
749 dopt f dflags = f `elem` (flags dflags)
752 dopt_set :: DynFlags -> DynFlag -> DynFlags
753 dopt_set dfs f = dfs{ flags = f : flags dfs }
755 -- | Unset a 'DynFlag'
756 dopt_unset :: DynFlags -> DynFlag -> DynFlags
757 dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }
759 -- | Retrieve the options corresponding to a particular @opt_*@ field in the correct order
760 getOpts :: DynFlags -- ^ 'DynFlags' to retrieve the options from
761 -> (DynFlags -> [a]) -- ^ Relevant record accessor: one of the @opt_*@ accessors
762 -> [a] -- ^ Correctly ordered extracted options
763 getOpts dflags opts = reverse (opts dflags)
764 -- We add to the options from the front, so we need to reverse the list
766 -- | Gets the verbosity flag for the current verbosity level. This is fed to
767 -- other tools, so GHC-specific verbosity flags like @-ddump-most@ are not included
768 getVerbFlag :: DynFlags -> String
770 | verbosity dflags >= 3 = "-v"
773 setObjectDir, setHiDir, setStubDir, setOutputDir,
774 setObjectSuf, setHiSuf, setHcSuf, parseDynLibLoaderMode,
775 setPgmP, setPgmL, setPgmF, setPgmc, setPgmm, setPgms, setPgma, setPgml, setPgmdll, setPgmwindres,
776 addOptL, addOptP, addOptF, addOptc, addOptm, addOpta, addOptl, addOptwindres,
777 addCmdlineFramework, addHaddockOpts
778 :: String -> DynFlags -> DynFlags
779 setOutputFile, setOutputHi, setDumpPrefixForce
780 :: Maybe String -> DynFlags -> DynFlags
782 setObjectDir f d = d{ objectDir = Just f}
783 setHiDir f d = d{ hiDir = Just f}
784 setStubDir f d = d{ stubDir = Just f, includePaths = f : includePaths d }
785 -- -stubdir D adds an implicit -I D, so that gcc can find the _stub.h file
786 -- \#included from the .hc file when compiling with -fvia-C.
787 setOutputDir f = setObjectDir f . setHiDir f . setStubDir f
789 setObjectSuf f d = d{ objectSuf = f}
790 setHiSuf f d = d{ hiSuf = f}
791 setHcSuf f d = d{ hcSuf = f}
793 setOutputFile f d = d{ outputFile = f}
794 setOutputHi f d = d{ outputHi = f}
796 parseDynLibLoaderMode f d =
798 ("deploy", "") -> d{ dynLibLoader = Deployable }
799 ("sysdep", "") -> d{ dynLibLoader = SystemDependent }
800 ("wrapped", "") -> d{ dynLibLoader = Wrapped Nothing }
801 ("wrapped:", "hard") -> d{ dynLibLoader = Wrapped Nothing }
802 ("wrapped:", flex) -> d{ dynLibLoader = Wrapped (Just flex) }
803 _ -> ghcError (CmdLineError ("Unknown dynlib loader: " ++ f))
805 setDumpPrefixForce f d = d { dumpPrefixForce = f}
807 -- XXX HACK: Prelude> words "'does not' work" ===> ["'does","not'","work"]
808 -- Config.hs should really use Option.
809 setPgmP f d = let (pgm:args) = words f in d{ pgm_P = (pgm, map Option args)}
811 setPgmL f d = d{ pgm_L = f}
812 setPgmF f d = d{ pgm_F = f}
813 setPgmc f d = d{ pgm_c = (f,[])}
814 setPgmm f d = d{ pgm_m = (f,[])}
815 setPgms f d = d{ pgm_s = (f,[])}
816 setPgma f d = d{ pgm_a = (f,[])}
817 setPgml f d = d{ pgm_l = (f,[])}
818 setPgmdll f d = d{ pgm_dll = (f,[])}
819 setPgmwindres f d = d{ pgm_windres = f}
821 addOptL f d = d{ opt_L = f : opt_L d}
822 addOptP f d = d{ opt_P = f : opt_P d}
823 addOptF f d = d{ opt_F = f : opt_F d}
824 addOptc f d = d{ opt_c = f : opt_c d}
825 addOptm f d = d{ opt_m = f : opt_m d}
826 addOpta f d = d{ opt_a = f : opt_a d}
827 addOptl f d = d{ opt_l = f : opt_l d}
828 addOptwindres f d = d{ opt_windres = f : opt_windres d}
830 setDepMakefile :: FilePath -> DynFlags -> DynFlags
831 setDepMakefile f d = d { depMakefile = deOptDep f }
833 setDepIncludePkgDeps :: Bool -> DynFlags -> DynFlags
834 setDepIncludePkgDeps b d = d { depIncludePkgDeps = b }
836 addDepExcludeMod :: String -> DynFlags -> DynFlags
838 = d { depExcludeMods = mkModuleName (deOptDep m) : depExcludeMods d }
840 addDepSuffix :: FilePath -> DynFlags -> DynFlags
841 addDepSuffix s d = d { depSuffixes = deOptDep s : depSuffixes d }
844 -- We used to use "-optdep-flag -optdeparg", so for legacy applications
845 -- we need to strip the "-optdep" off of the arg
846 deOptDep :: String -> String
847 deOptDep x = case stripPrefix "-optdep" x of
851 addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}
853 addHaddockOpts f d = d{ haddockOptions = Just f}
855 -- -----------------------------------------------------------------------------
856 -- Command-line options
858 -- | When invoking external tools as part of the compilation pipeline, we
859 -- pass these a sequence of options on the command-line. Rather than
860 -- just using a list of Strings, we use a type that allows us to distinguish
861 -- between filepaths and 'other stuff'. The reason for this is that
862 -- this type gives us a handle on transforming filenames, and filenames only,
863 -- to whatever format they're expected to be on a particular platform.
865 = FileOption -- an entry that _contains_ filename(s) / filepaths.
866 String -- a non-filepath prefix that shouldn't be
867 -- transformed (e.g., "/out=")
868 String -- the filepath/filename portion
871 showOpt :: Option -> String
872 showOpt (FileOption pre f) = pre ++ f
873 showOpt (Option s) = s
875 -----------------------------------------------------------------------------
876 -- Setting the optimisation level
878 updOptLevel :: Int -> DynFlags -> DynFlags
879 -- ^ Sets the 'DynFlags' to be appropriate to the optimisation level
881 = dfs2{ optLevel = final_n }
883 final_n = max 0 (min 2 n) -- Clamp to 0 <= n <= 2
884 dfs1 = foldr (flip dopt_unset) dfs remove_dopts
885 dfs2 = foldr (flip dopt_set) dfs1 extra_dopts
887 extra_dopts = [ f | (ns,f) <- optLevelFlags, final_n `elem` ns ]
888 remove_dopts = [ f | (ns,f) <- optLevelFlags, final_n `notElem` ns ]
890 optLevelFlags :: [([Int], DynFlag)]
892 = [ ([0], Opt_IgnoreInterfacePragmas)
893 , ([0], Opt_OmitInterfacePragmas)
895 , ([1,2], Opt_IgnoreAsserts)
896 , ([1,2], Opt_EnableRewriteRules) -- Off for -O0; see Note [Scoping for Builtin rules]
898 , ([1,2], Opt_DoEtaReduction)
899 , ([1,2], Opt_CaseMerge)
900 , ([1,2], Opt_Strictness)
902 , ([1,2], Opt_FullLaziness)
903 , ([1,2], Opt_Specialise)
904 , ([1,2], Opt_FloatIn)
906 , ([2], Opt_LiberateCase)
907 , ([2], Opt_SpecConstr)
909 -- , ([2], Opt_StaticArgumentTransformation)
910 -- Max writes: I think it's probably best not to enable SAT with -O2 for the
911 -- 6.10 release. The version of SAT in HEAD at the moment doesn't incorporate
912 -- several improvements to the heuristics, and I'm concerned that without
913 -- those changes SAT will interfere with some attempts to write "high
914 -- performance Haskell", as we saw in some posts on Haskell-Cafe earlier
915 -- this year. In particular, the version in HEAD lacks the tail call
916 -- criterion, so many things that look like reasonable loops will be
917 -- turned into functions with extra (unneccesary) thunk creation.
919 , ([0,1,2], Opt_DoLambdaEtaExpansion)
920 -- This one is important for a tiresome reason:
921 -- we want to make sure that the bindings for data
922 -- constructors are eta-expanded. This is probably
923 -- a good thing anyway, but it seems fragile.
926 -- -----------------------------------------------------------------------------
927 -- Standard sets of warning options
929 standardWarnings :: [DynFlag]
931 = [ Opt_WarnWarningsDeprecations,
932 Opt_WarnDeprecatedFlags,
933 Opt_WarnUnrecognisedPragmas,
934 Opt_WarnOverlappingPatterns,
935 Opt_WarnMissingFields,
936 Opt_WarnMissingMethods,
937 Opt_WarnDuplicateExports,
938 Opt_WarnLazyUnliftedBindings,
939 Opt_WarnDodgyForeignImports,
943 minusWOpts :: [DynFlag]
945 = standardWarnings ++
946 [ Opt_WarnUnusedBinds,
947 Opt_WarnUnusedMatches,
948 Opt_WarnUnusedImports,
949 Opt_WarnIncompletePatterns,
950 Opt_WarnDodgyExports,
954 minusWallOpts :: [DynFlag]
957 [ Opt_WarnTypeDefaults,
958 Opt_WarnNameShadowing,
965 -- minuswRemovesOpts should be every warning option
966 minuswRemovesOpts :: [DynFlag]
969 [Opt_WarnImplicitPrelude,
970 Opt_WarnIncompletePatternsRecUpd,
971 Opt_WarnSimplePatterns,
972 Opt_WarnMonomorphism,
973 Opt_WarnUnrecognisedPragmas,
977 -- -----------------------------------------------------------------------------
978 -- CoreToDo: abstraction of core-to-core passes to run.
980 data CoreToDo -- These are diff core-to-core passes,
981 -- which may be invoked in any order,
982 -- as many times as you like.
984 = CoreDoSimplify -- The core-to-core simplifier.
987 -- Each run of the simplifier can take a different
988 -- set of simplifier-specific flags.
990 | CoreDoFloatOutwards FloatOutSwitches
995 | CoreDoWorkerWrapper
998 | CoreDoOldStrictness
1001 | CoreDoRuleCheck Int{-CompilerPhase-} String -- Check for non-application of rules
1002 -- matching this string
1003 | CoreDoVectorisation PackageId
1004 | CoreDoNothing -- Useful when building up
1005 | CoreDoPasses [CoreToDo] -- lists of these things
1008 data SimplifierMode -- See comments in SimplMonad
1010 { sm_rules :: Bool -- Whether RULES are enabled
1011 , sm_inline :: Bool } -- Whether inlining is enabled
1014 { sm_num :: Int -- Phase number; counts downward so 0 is last phase
1015 , sm_names :: [String] } -- Name(s) of the phase
1017 instance Outputable SimplifierMode where
1018 ppr (SimplPhase { sm_num = n, sm_names = ss })
1019 = int n <+> brackets (text (concat $ intersperse "," ss))
1020 ppr (SimplGently { sm_rules = r, sm_inline = i })
1021 = ptext (sLit "gentle") <>
1022 brackets (pp_flag r (sLit "rules") <> comma <>
1023 pp_flag i (sLit "inline"))
1025 pp_flag f s = ppUnless f (ptext (sLit "no")) <+> ptext s
1027 data SimplifierSwitch
1028 = MaxSimplifierIterations Int
1031 data FloatOutSwitches = FloatOutSwitches {
1032 floatOutLambdas :: Bool, -- ^ True <=> float lambdas to top level
1033 floatOutConstants :: Bool -- ^ True <=> float constants to top level,
1034 -- even if they do not escape a lambda
1037 instance Outputable FloatOutSwitches where
1038 ppr = pprFloatOutSwitches
1040 pprFloatOutSwitches :: FloatOutSwitches -> SDoc
1041 pprFloatOutSwitches sw = pp_not (floatOutLambdas sw) <+> text "lambdas" <> comma
1042 <+> pp_not (floatOutConstants sw) <+> text "constants"
1045 pp_not False = text "not"
1047 -- | Switches that specify the minimum amount of floating out
1048 -- gentleFloatOutSwitches :: FloatOutSwitches
1049 -- gentleFloatOutSwitches = FloatOutSwitches False False
1051 -- | Switches that do not specify floating out of lambdas, just of constants
1052 constantsOnlyFloatOutSwitches :: FloatOutSwitches
1053 constantsOnlyFloatOutSwitches = FloatOutSwitches False True
1056 -- The core-to-core pass ordering is derived from the DynFlags:
1057 runWhen :: Bool -> CoreToDo -> CoreToDo
1058 runWhen True do_this = do_this
1059 runWhen False _ = CoreDoNothing
1061 runMaybe :: Maybe a -> (a -> CoreToDo) -> CoreToDo
1062 runMaybe (Just x) f = f x
1063 runMaybe Nothing _ = CoreDoNothing
1065 getCoreToDo :: DynFlags -> [CoreToDo]
1067 | Just todo <- coreToDo dflags = todo -- set explicitly by user
1068 | otherwise = core_todo
1070 opt_level = optLevel dflags
1071 phases = simplPhases dflags
1072 max_iter = maxSimplIterations dflags
1073 strictness = dopt Opt_Strictness dflags
1074 full_laziness = dopt Opt_FullLaziness dflags
1075 do_specialise = dopt Opt_Specialise dflags
1076 do_float_in = dopt Opt_FloatIn dflags
1077 cse = dopt Opt_CSE dflags
1078 spec_constr = dopt Opt_SpecConstr dflags
1079 liberate_case = dopt Opt_LiberateCase dflags
1080 rule_check = ruleCheck dflags
1081 static_args = dopt Opt_StaticArgumentTransformation dflags
1083 maybe_rule_check phase = runMaybe rule_check (CoreDoRuleCheck phase)
1085 maybe_strictness_before phase
1086 = runWhen (phase `elem` strictnessBefore dflags) CoreDoStrictness
1088 simpl_phase phase names iter
1090 [ maybe_strictness_before phase,
1091 CoreDoSimplify (SimplPhase phase names) [
1092 MaxSimplifierIterations iter
1094 maybe_rule_check phase
1098 = runWhen (dopt Opt_Vectorise dflags)
1099 $ CoreDoPasses [ simpl_gently, CoreDoVectorisation (dphPackage dflags) ]
1102 -- By default, we have 2 phases before phase 0.
1104 -- Want to run with inline phase 2 after the specialiser to give
1105 -- maximum chance for fusion to work before we inline build/augment
1106 -- in phase 1. This made a difference in 'ansi' where an
1107 -- overloaded function wasn't inlined till too late.
1109 -- Need phase 1 so that build/augment get
1110 -- inlined. I found that spectral/hartel/genfft lost some useful
1111 -- strictness in the function sumcode' if augment is not inlined
1112 -- before strictness analysis runs
1113 simpl_phases = CoreDoPasses [ simpl_phase phase ["main"] max_iter
1114 | phase <- [phases, phases-1 .. 1] ]
1117 -- initial simplify: mk specialiser happy: minimum effort please
1118 simpl_gently = CoreDoSimplify
1119 (SimplGently { sm_rules = True, sm_inline = False })
1121 -- Simplify "gently"
1122 -- Don't inline anything till full laziness has bitten
1123 -- In particular, inlining wrappers inhibits floating
1124 -- e.g. ...(case f x of ...)...
1125 -- ==> ...(case (case x of I# x# -> fw x#) of ...)...
1126 -- ==> ...(case x of I# x# -> case fw x# of ...)...
1127 -- and now the redex (f x) isn't floatable any more
1128 -- Similarly, don't apply any rules until after full
1129 -- laziness. Notably, list fusion can prevent floating.
1131 NoCaseOfCase, -- Don't do case-of-case transformations.
1132 -- This makes full laziness work better
1133 MaxSimplifierIterations max_iter
1137 if opt_level == 0 then
1139 simpl_phase 0 ["final"] max_iter]
1140 else {- opt_level >= 1 -} [
1142 -- We want to do the static argument transform before full laziness as it
1143 -- may expose extra opportunities to float things outwards. However, to fix
1144 -- up the output of the transformation we need at do at least one simplify
1145 -- after this before anything else
1146 runWhen static_args (CoreDoPasses [ simpl_gently, CoreDoStaticArgs ]),
1148 -- We run vectorisation here for now, but we might also try to run
1152 -- initial simplify: mk specialiser happy: minimum effort please
1155 -- Specialisation is best done before full laziness
1156 -- so that overloaded functions have all their dictionary lambdas manifest
1157 runWhen do_specialise CoreDoSpecialising,
1159 runWhen full_laziness (CoreDoFloatOutwards constantsOnlyFloatOutSwitches),
1160 -- Was: gentleFloatOutSwitches
1161 -- I have no idea why, but not floating constants to top level is
1162 -- very bad in some cases.
1163 -- Notably: p_ident in spectral/rewrite
1164 -- Changing from "gentle" to "constantsOnly" improved
1165 -- rewrite's allocation by 19%, and made 0.0% difference
1166 -- to any other nofib benchmark
1168 runWhen do_float_in CoreDoFloatInwards,
1172 -- Phase 0: allow all Ids to be inlined now
1173 -- This gets foldr inlined before strictness analysis
1175 -- At least 3 iterations because otherwise we land up with
1176 -- huge dead expressions because of an infelicity in the
1178 -- let k = BIG in foldr k z xs
1179 -- ==> let k = BIG in letrec go = \xs -> ...(k x).... in go xs
1180 -- ==> let k = BIG in letrec go = \xs -> ...(BIG x).... in go xs
1182 simpl_phase 0 ["main"] (max max_iter 3),
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 ( "expose-all-unfoldings", Opt_ExposeAllUnfoldings, const Supported ),
1732 ( "do-lambda-eta-expansion", Opt_DoLambdaEtaExpansion, const Supported ),
1733 ( "ignore-asserts", Opt_IgnoreAsserts, const Supported ),
1734 ( "do-eta-reduction", Opt_DoEtaReduction, const Supported ),
1735 ( "case-merge", Opt_CaseMerge, const Supported ),
1736 ( "unbox-strict-fields", Opt_UnboxStrictFields, const Supported ),
1737 ( "method-sharing", Opt_MethodSharing, const Supported ),
1738 ( "dicts-cheap", Opt_DictsCheap, const Supported ),
1739 ( "excess-precision", Opt_ExcessPrecision, const Supported ),
1740 ( "eager-blackholing", Opt_EagerBlackHoling, const Supported ),
1741 ( "asm-mangling", Opt_DoAsmMangling, const Supported ),
1742 ( "print-bind-result", Opt_PrintBindResult, const Supported ),
1743 ( "force-recomp", Opt_ForceRecomp, const Supported ),
1744 ( "hpc-no-auto", Opt_Hpc_No_Auto, const Supported ),
1745 ( "rewrite-rules", Opt_EnableRewriteRules, useInstead "enable-rewrite-rules" ),
1746 ( "enable-rewrite-rules", Opt_EnableRewriteRules, const Supported ),
1747 ( "break-on-exception", Opt_BreakOnException, const Supported ),
1748 ( "break-on-error", Opt_BreakOnError, const Supported ),
1749 ( "print-evld-with-show", Opt_PrintEvldWithShow, const Supported ),
1750 ( "print-bind-contents", Opt_PrintBindContents, const Supported ),
1751 ( "run-cps", Opt_RunCPS, const Supported ),
1752 ( "run-cpsz", Opt_RunCPSZ, const Supported ),
1753 ( "new-codegen", Opt_TryNewCodeGen, const Supported ),
1754 ( "convert-to-zipper-and-back", Opt_ConvertToZipCfgAndBack, const Supported ),
1755 ( "vectorise", Opt_Vectorise, const Supported ),
1756 ( "regs-graph", Opt_RegsGraph, const Supported ),
1757 ( "regs-iterative", Opt_RegsIterative, const Supported ),
1758 ( "th", Opt_TemplateHaskell,
1759 deprecatedForLanguage "TemplateHaskell" ),
1760 ( "fi", Opt_ForeignFunctionInterface,
1761 deprecatedForLanguage "ForeignFunctionInterface" ),
1762 ( "ffi", Opt_ForeignFunctionInterface,
1763 deprecatedForLanguage "ForeignFunctionInterface" ),
1764 ( "arrows", Opt_Arrows,
1765 deprecatedForLanguage "Arrows" ),
1766 ( "generics", Opt_Generics,
1767 deprecatedForLanguage "Generics" ),
1768 ( "implicit-prelude", Opt_ImplicitPrelude,
1769 deprecatedForLanguage "ImplicitPrelude" ),
1770 ( "bang-patterns", Opt_BangPatterns,
1771 deprecatedForLanguage "BangPatterns" ),
1772 ( "monomorphism-restriction", Opt_MonomorphismRestriction,
1773 deprecatedForLanguage "MonomorphismRestriction" ),
1774 ( "mono-pat-binds", Opt_MonoPatBinds,
1775 deprecatedForLanguage "MonoPatBinds" ),
1776 ( "extended-default-rules", Opt_ExtendedDefaultRules,
1777 deprecatedForLanguage "ExtendedDefaultRules" ),
1778 ( "implicit-params", Opt_ImplicitParams,
1779 deprecatedForLanguage "ImplicitParams" ),
1780 ( "scoped-type-variables", Opt_ScopedTypeVariables,
1781 deprecatedForLanguage "ScopedTypeVariables" ),
1783 deprecatedForLanguage "PArr" ),
1784 ( "allow-overlapping-instances", Opt_OverlappingInstances,
1785 deprecatedForLanguage "OverlappingInstances" ),
1786 ( "allow-undecidable-instances", Opt_UndecidableInstances,
1787 deprecatedForLanguage "UndecidableInstances" ),
1788 ( "allow-incoherent-instances", Opt_IncoherentInstances,
1789 deprecatedForLanguage "IncoherentInstances" ),
1790 ( "gen-manifest", Opt_GenManifest, const Supported ),
1791 ( "embed-manifest", Opt_EmbedManifest, const Supported ),
1792 ( "ext-core", Opt_EmitExternalCore, const Supported ),
1793 ( "shared-implib", Opt_SharedImplib, const Supported ),
1794 ( "building-cabal-package", Opt_BuildingCabalPackage, const Supported ),
1795 ( "implicit-import-qualified", Opt_ImplicitImportQualified, const Supported )
1798 supportedLanguages :: [String]
1799 supportedLanguages = [ name | (name, _, _) <- xFlags ]
1801 -- This may contain duplicates
1802 languageOptions :: [DynFlag]
1803 languageOptions = [ dynFlag | (_, dynFlag, _) <- xFlags ]
1805 -- | These -X<blah> flags can all be reversed with -XNo<blah>
1806 xFlags :: [(String, DynFlag, Bool -> Deprecated)]
1808 ( "CPP", Opt_Cpp, const Supported ),
1809 ( "PostfixOperators", Opt_PostfixOperators, const Supported ),
1810 ( "TupleSections", Opt_TupleSections, const Supported ),
1811 ( "PatternGuards", Opt_PatternGuards, const Supported ),
1812 ( "UnicodeSyntax", Opt_UnicodeSyntax, const Supported ),
1813 ( "MagicHash", Opt_MagicHash, const Supported ),
1814 ( "PolymorphicComponents", Opt_PolymorphicComponents, const Supported ),
1815 ( "ExistentialQuantification", Opt_ExistentialQuantification, const Supported ),
1816 ( "KindSignatures", Opt_KindSignatures, const Supported ),
1817 ( "EmptyDataDecls", Opt_EmptyDataDecls, const Supported ),
1818 ( "ParallelListComp", Opt_ParallelListComp, const Supported ),
1819 ( "TransformListComp", Opt_TransformListComp, const Supported ),
1820 ( "ForeignFunctionInterface", Opt_ForeignFunctionInterface, const Supported ),
1821 ( "UnliftedFFITypes", Opt_UnliftedFFITypes, const Supported ),
1822 ( "GHCForeignImportPrim", Opt_GHCForeignImportPrim, const Supported ),
1823 ( "LiberalTypeSynonyms", Opt_LiberalTypeSynonyms, const Supported ),
1824 ( "Rank2Types", Opt_Rank2Types, const Supported ),
1825 ( "RankNTypes", Opt_RankNTypes, const Supported ),
1826 ( "ImpredicativeTypes", Opt_ImpredicativeTypes,
1827 const $ Deprecated "impredicative polymorphism will be simplified or removed in GHC 6.14" ),
1828 ( "TypeOperators", Opt_TypeOperators, const Supported ),
1829 ( "RecursiveDo", Opt_RecursiveDo,
1830 deprecatedForLanguage "DoRec"),
1831 ( "DoRec", Opt_DoRec, const Supported ),
1832 ( "Arrows", Opt_Arrows, const Supported ),
1833 ( "PArr", Opt_PArr, const Supported ),
1834 ( "TemplateHaskell", Opt_TemplateHaskell, const Supported ),
1835 ( "QuasiQuotes", Opt_QuasiQuotes, const Supported ),
1836 ( "Generics", Opt_Generics, const Supported ),
1838 ( "ImplicitPrelude", Opt_ImplicitPrelude, const Supported ),
1839 ( "RecordWildCards", Opt_RecordWildCards, const Supported ),
1840 ( "NamedFieldPuns", Opt_RecordPuns, const Supported ),
1841 ( "RecordPuns", Opt_RecordPuns,
1842 deprecatedForLanguage "NamedFieldPuns" ),
1843 ( "DisambiguateRecordFields", Opt_DisambiguateRecordFields, const Supported ),
1844 ( "OverloadedStrings", Opt_OverloadedStrings, const Supported ),
1845 ( "GADTs", Opt_GADTs, const Supported ),
1846 ( "ViewPatterns", Opt_ViewPatterns, const Supported ),
1847 ( "TypeFamilies", Opt_TypeFamilies, const Supported ),
1848 ( "BangPatterns", Opt_BangPatterns, const Supported ),
1850 ( "MonomorphismRestriction", Opt_MonomorphismRestriction, const Supported ),
1852 ( "NPlusKPatterns", Opt_NPlusKPatterns, const Supported ),
1853 -- On by default (which is not strictly H98):
1854 ( "MonoPatBinds", Opt_MonoPatBinds, const Supported ),
1855 ( "ExplicitForAll", Opt_ExplicitForAll, const Supported ),
1856 ( "AlternativeLayoutRule", Opt_AlternativeLayoutRule, const Supported ),
1857 ( "MonoLocalBinds", Opt_MonoLocalBinds, const Supported ),
1858 ( "RelaxedPolyRec", Opt_RelaxedPolyRec, const Supported ),
1859 ( "ExtendedDefaultRules", Opt_ExtendedDefaultRules, const Supported ),
1860 ( "ImplicitParams", Opt_ImplicitParams, const Supported ),
1861 ( "ScopedTypeVariables", Opt_ScopedTypeVariables, const Supported ),
1863 ( "PatternSignatures", Opt_ScopedTypeVariables,
1864 deprecatedForLanguage "ScopedTypeVariables" ),
1866 ( "UnboxedTuples", Opt_UnboxedTuples, const Supported ),
1867 ( "StandaloneDeriving", Opt_StandaloneDeriving, const Supported ),
1868 ( "DeriveDataTypeable", Opt_DeriveDataTypeable, const Supported ),
1869 ( "DeriveFunctor", Opt_DeriveFunctor, const Supported ),
1870 ( "DeriveTraversable", Opt_DeriveTraversable, const Supported ),
1871 ( "DeriveFoldable", Opt_DeriveFoldable, const Supported ),
1872 ( "TypeSynonymInstances", Opt_TypeSynonymInstances, const Supported ),
1873 ( "FlexibleContexts", Opt_FlexibleContexts, const Supported ),
1874 ( "FlexibleInstances", Opt_FlexibleInstances, const Supported ),
1875 ( "ConstrainedClassMethods", Opt_ConstrainedClassMethods, const Supported ),
1876 ( "MultiParamTypeClasses", Opt_MultiParamTypeClasses, const Supported ),
1877 ( "FunctionalDependencies", Opt_FunctionalDependencies, const Supported ),
1878 ( "GeneralizedNewtypeDeriving", Opt_GeneralizedNewtypeDeriving, const Supported ),
1879 ( "OverlappingInstances", Opt_OverlappingInstances, const Supported ),
1880 ( "UndecidableInstances", Opt_UndecidableInstances, const Supported ),
1881 ( "IncoherentInstances", Opt_IncoherentInstances, const Supported ),
1882 ( "PackageImports", Opt_PackageImports, const Supported ),
1883 ( "NewQualifiedOperators", Opt_NewQualifiedOperators, const Supported )
1886 impliedFlags :: [(DynFlag, DynFlag)]
1888 = [ (Opt_RankNTypes, Opt_ExplicitForAll)
1889 , (Opt_Rank2Types, Opt_ExplicitForAll)
1890 , (Opt_ScopedTypeVariables, Opt_ExplicitForAll)
1891 , (Opt_LiberalTypeSynonyms, Opt_ExplicitForAll)
1892 , (Opt_ExistentialQuantification, Opt_ExplicitForAll)
1893 , (Opt_PolymorphicComponents, Opt_ExplicitForAll)
1895 , (Opt_GADTs, Opt_RelaxedPolyRec) -- We want type-sig variables to
1896 -- be completely rigid for GADTs
1898 , (Opt_TypeFamilies, Opt_RelaxedPolyRec) -- Trac #2944 gives a nice example
1899 , (Opt_TypeFamilies, Opt_KindSignatures) -- Type families use kind signatures
1900 -- all over the place
1902 , (Opt_ScopedTypeVariables, Opt_RelaxedPolyRec) -- Ditto for scoped type variables; see
1903 -- Note [Scoped tyvars] in TcBinds
1904 , (Opt_ImpredicativeTypes, Opt_RankNTypes)
1906 -- Record wild-cards implies field disambiguation
1907 -- Otherwise if you write (C {..}) you may well get
1908 -- stuff like " 'a' not in scope ", which is a bit silly
1909 -- if the compiler has just filled in field 'a' of constructor 'C'
1910 , (Opt_RecordWildCards, Opt_DisambiguateRecordFields)
1913 glasgowExtsFlags :: [DynFlag]
1914 glasgowExtsFlags = [
1915 Opt_PrintExplicitForalls
1916 , Opt_ForeignFunctionInterface
1917 , Opt_UnliftedFFITypes
1919 , Opt_ImplicitParams
1920 , Opt_ScopedTypeVariables
1922 , Opt_TypeSynonymInstances
1923 , Opt_StandaloneDeriving
1924 , Opt_DeriveDataTypeable
1926 , Opt_DeriveFoldable
1927 , Opt_DeriveTraversable
1928 , Opt_FlexibleContexts
1929 , Opt_FlexibleInstances
1930 , Opt_ConstrainedClassMethods
1931 , Opt_MultiParamTypeClasses
1932 , Opt_FunctionalDependencies
1934 , Opt_PolymorphicComponents
1935 , Opt_ExistentialQuantification
1937 , Opt_PostfixOperators
1939 , Opt_LiberalTypeSynonyms
1943 , Opt_ParallelListComp
1944 , Opt_EmptyDataDecls
1945 , Opt_KindSignatures
1946 , Opt_GeneralizedNewtypeDeriving
1947 , Opt_TypeFamilies ]
1949 -- -----------------------------------------------------------------------------
1950 -- Parsing the dynamic flags.
1952 -- | Parse dynamic flags from a list of command line arguments. Returns the
1953 -- the parsed 'DynFlags', the left-over arguments, and a list of warnings.
1954 -- Throws a 'UsageError' if errors occurred during parsing (such as unknown
1955 -- flags or missing arguments).
1956 parseDynamicFlags :: Monad m =>
1957 DynFlags -> [Located String]
1958 -> m (DynFlags, [Located String], [Located String])
1959 -- ^ Updated 'DynFlags', left-over arguments, and
1960 -- list of warnings.
1961 parseDynamicFlags dflags args = parseDynamicFlags_ dflags args True
1963 -- | Like 'parseDynamicFlags' but does not allow the package flags (-package,
1964 -- -hide-package, -ignore-package, -hide-all-packages, -package-conf).
1965 parseDynamicNoPackageFlags :: Monad m =>
1966 DynFlags -> [Located String]
1967 -> m (DynFlags, [Located String], [Located String])
1968 -- ^ Updated 'DynFlags', left-over arguments, and
1969 -- list of warnings.
1970 parseDynamicNoPackageFlags dflags args = parseDynamicFlags_ dflags args False
1972 parseDynamicFlags_ :: Monad m =>
1973 DynFlags -> [Located String] -> Bool
1974 -> m (DynFlags, [Located String], [Located String])
1975 parseDynamicFlags_ dflags0 args pkg_flags = do
1976 -- XXX Legacy support code
1977 -- We used to accept things like
1978 -- optdep-f -optdepdepend
1979 -- optdep-f -optdep depend
1980 -- optdep -f -optdepdepend
1981 -- optdep -f -optdep depend
1982 -- but the spaces trip up proper argument handling. So get rid of them.
1983 let f (L p "-optdep" : L _ x : xs) = (L p ("-optdep" ++ x)) : f xs
1984 f (x : xs) = x : f xs
1988 -- Note: -ignore-package (package_flags) must precede -i* (dynamic_flags)
1989 flag_spec | pkg_flags = package_flags ++ dynamic_flags
1990 | otherwise = dynamic_flags
1992 let ((leftover, errs, warns), dflags1)
1993 = runCmdLine (processArgs flag_spec args') dflags0
1994 when (not (null errs)) $ ghcError $ errorsToGhcException errs
1996 -- Cannot use -fPIC with registerised -fvia-C, because the mangler
1997 -- isn't up to the job. We know that if hscTarget == HscC, then the
1998 -- user has explicitly used -fvia-C, because -fasm is the default,
1999 -- unless there is no NCG on this platform. The latter case is
2000 -- checked when the -fPIC flag is parsed.
2002 let (pic_warns, dflags2) =
2003 if opt_PIC && hscTarget dflags1 == HscC && cGhcUnregisterised == "NO"
2004 then ([L noSrcSpan $ "Warning: -fvia-C is incompatible with -fPIC; ignoring -fvia-C"],
2005 dflags1{ hscTarget = HscAsm })
2008 return (dflags2, leftover, pic_warns ++ warns)
2010 type DynP = CmdLineP DynFlags
2012 upd :: (DynFlags -> DynFlags) -> DynP ()
2014 dfs <- getCmdLineState
2015 putCmdLineState $! (f dfs)
2017 --------------------------
2018 setDynFlag, unSetDynFlag :: DynFlag -> DynP ()
2019 setDynFlag f = do { upd (\dfs -> dopt_set dfs f)
2020 ; mapM_ setDynFlag deps }
2022 deps = [ d | (f', d) <- impliedFlags, f' == f ]
2023 -- When you set f, set the ones it implies
2024 -- NB: use setDynFlag recursively, in case the implied flags
2025 -- implies further flags
2026 -- When you un-set f, however, we don't un-set the things it implies
2027 -- (except for -fno-glasgow-exts, which is treated specially)
2029 unSetDynFlag f = upd (\dfs -> dopt_unset dfs f)
2031 --------------------------
2032 setDumpFlag :: DynFlag -> OptKind DynP
2033 setDumpFlag dump_flag
2034 = NoArg (do { setDynFlag dump_flag
2035 ; when want_recomp forceRecompile })
2037 -- Certain dumpy-things are really interested in what's going
2038 -- on during recompilation checking, so in those cases we
2039 -- don't want to turn it off.
2040 want_recomp = dump_flag `notElem` [Opt_D_dump_if_trace,
2041 Opt_D_dump_hi_diffs]
2043 forceRecompile :: DynP ()
2044 -- Whenver we -ddump, force recompilation (by switching off the
2045 -- recompilation checker), else you don't see the dump! However,
2046 -- don't switch it off in --make mode, else *everything* gets
2047 -- recompiled which probably isn't what you want
2048 forceRecompile = do { dfs <- getCmdLineState
2049 ; when (force_recomp dfs) (setDynFlag Opt_ForceRecomp) }
2051 force_recomp dfs = isOneShot (ghcMode dfs)
2053 setVerboseCore2Core :: DynP ()
2054 setVerboseCore2Core = do setDynFlag Opt_D_verbose_core2core
2056 upd (\s -> s { shouldDumpSimplPhase = const True })
2058 setDumpSimplPhases :: String -> DynP ()
2059 setDumpSimplPhases s = do forceRecompile
2060 upd (\s -> s { shouldDumpSimplPhase = spec })
2062 spec :: SimplifierMode -> Bool
2064 . map (join (&&) . map match . split ':')
2070 join :: (Bool -> Bool -> Bool)
2071 -> [SimplifierMode -> Bool]
2072 -> SimplifierMode -> Bool
2073 join _ [] = const True
2074 join op ss = foldr1 (\f g x -> f x `op` g x) ss
2076 match :: String -> SimplifierMode -> Bool
2077 match "" = const True
2078 match s = case reads s of
2079 [(n,"")] -> phase_num n
2082 phase_num :: Int -> SimplifierMode -> Bool
2083 phase_num n (SimplPhase k _) = n == k
2084 phase_num _ _ = False
2086 phase_name :: String -> SimplifierMode -> Bool
2087 phase_name s (SimplGently {}) = s == "gentle"
2088 phase_name s (SimplPhase { sm_names = ss }) = s `elem` ss
2090 setVerbosity :: Maybe Int -> DynP ()
2091 setVerbosity mb_n = upd (\dfs -> dfs{ verbosity = mb_n `orElse` 3 })
2093 addCmdlineHCInclude :: String -> DynP ()
2094 addCmdlineHCInclude a = upd (\s -> s{cmdlineHcIncludes = a : cmdlineHcIncludes s})
2096 extraPkgConf_ :: FilePath -> DynP ()
2097 extraPkgConf_ p = upd (\s -> s{ extraPkgConfs = p : extraPkgConfs s })
2099 exposePackage, exposePackageId, hidePackage, ignorePackage :: String -> DynP ()
2101 upd (\s -> s{ packageFlags = ExposePackage p : packageFlags s })
2103 upd (\s -> s{ packageFlags = ExposePackageId p : packageFlags s })
2105 upd (\s -> s{ packageFlags = HidePackage p : packageFlags s })
2107 upd (\s -> s{ packageFlags = IgnorePackage p : packageFlags s })
2109 setPackageName :: String -> DynFlags -> DynFlags
2110 setPackageName p s = s{ thisPackage = stringToPackageId p }
2112 -- If we're linking a binary, then only targets that produce object
2113 -- code are allowed (requests for other target types are ignored).
2114 setTarget :: HscTarget -> DynP ()
2115 setTarget l = upd set
2118 | ghcLink dfs /= LinkBinary || isObjectTarget l = dfs{ hscTarget = l }
2121 -- Changes the target only if we're compiling object code. This is
2122 -- used by -fasm and -fvia-C, which switch from one to the other, but
2123 -- not from bytecode to object-code. The idea is that -fasm/-fvia-C
2124 -- can be safely used in an OPTIONS_GHC pragma.
2125 setObjTarget :: HscTarget -> DynP ()
2126 setObjTarget l = upd set
2129 | isObjectTarget (hscTarget dfs) = dfs { hscTarget = l }
2132 setOptLevel :: Int -> DynFlags -> DynFlags
2133 setOptLevel n dflags
2134 | hscTarget dflags == HscInterpreted && n > 0
2136 -- not in IO any more, oh well:
2137 -- putStr "warning: -O conflicts with --interactive; -O ignored.\n"
2139 = updOptLevel n dflags
2142 -- -Odph is equivalent to
2144 -- -O2 optimise as much as possible
2145 -- -fno-method-sharing sharing specialisation defeats fusion
2147 -- -fdicts-cheap always inline dictionaries
2148 -- -fmax-simplifier-iterations20 this is necessary sometimes
2149 -- -fsimplifier-phases=3 we use an additional simplifier phase
2151 -- -fno-spec-constr-threshold run SpecConstr even for big loops
2152 -- -fno-spec-constr-count SpecConstr as much as possible
2153 -- -finline-enough-args hack to prevent excessive inlining
2155 setDPHOpt :: DynFlags -> DynFlags
2156 setDPHOpt dflags = setOptLevel 2 (dflags { maxSimplIterations = 20
2158 , specConstrThreshold = Nothing
2159 , specConstrCount = Nothing
2161 `dopt_set` Opt_DictsCheap
2162 `dopt_unset` Opt_MethodSharing
2164 data DPHBackend = DPHPar
2167 deriving(Eq, Ord, Enum, Show)
2169 setDPHBackend :: DPHBackend -> DynP ()
2170 setDPHBackend backend
2172 upd $ \dflags -> dflags { dphBackend = backend }
2173 mapM_ exposePackage (dph_packages backend)
2175 dph_packages DPHThis = []
2176 dph_packages DPHPar = ["dph-prim-par", "dph-par"]
2177 dph_packages DPHSeq = ["dph-prim-seq", "dph-seq"]
2179 dphPackage :: DynFlags -> PackageId
2180 dphPackage dflags = case dphBackend dflags of
2181 DPHPar -> dphParPackageId
2182 DPHSeq -> dphSeqPackageId
2183 DPHThis -> thisPackage dflags
2185 setMainIs :: String -> DynP ()
2187 | not (null main_fn) && isLower (head main_fn)
2188 -- The arg looked like "Foo.Bar.baz"
2189 = upd $ \d -> d{ mainFunIs = Just main_fn,
2190 mainModIs = mkModule mainPackageId (mkModuleName main_mod) }
2192 | isUpper (head arg) -- The arg looked like "Foo" or "Foo.Bar"
2193 = upd $ \d -> d{ mainModIs = mkModule mainPackageId (mkModuleName arg) }
2195 | otherwise -- The arg looked like "baz"
2196 = upd $ \d -> d{ mainFunIs = Just arg }
2198 (main_mod, main_fn) = splitLongestPrefix arg (== '.')
2200 -----------------------------------------------------------------------------
2201 -- Paths & Libraries
2203 addImportPath, addLibraryPath, addIncludePath, addFrameworkPath :: FilePath -> DynP ()
2205 -- -i on its own deletes the import paths
2206 addImportPath "" = upd (\s -> s{importPaths = []})
2207 addImportPath p = upd (\s -> s{importPaths = importPaths s ++ splitPathList p})
2211 upd (\s -> s{libraryPaths = libraryPaths s ++ splitPathList p})
2214 upd (\s -> s{includePaths = includePaths s ++ splitPathList p})
2216 addFrameworkPath p =
2217 upd (\s -> s{frameworkPaths = frameworkPaths s ++ splitPathList p})
2219 #ifndef mingw32_TARGET_OS
2220 split_marker :: Char
2221 split_marker = ':' -- not configurable (ToDo)
2224 splitPathList :: String -> [String]
2225 splitPathList s = filter notNull (splitUp s)
2226 -- empty paths are ignored: there might be a trailing
2227 -- ':' in the initial list, for example. Empty paths can
2228 -- cause confusion when they are translated into -I options
2229 -- for passing to gcc.
2231 #ifndef mingw32_TARGET_OS
2232 splitUp xs = split split_marker xs
2234 -- Windows: 'hybrid' support for DOS-style paths in directory lists.
2236 -- That is, if "foo:bar:baz" is used, this interpreted as
2237 -- consisting of three entries, 'foo', 'bar', 'baz'.
2238 -- However, with "c:/foo:c:\\foo;x:/bar", this is interpreted
2239 -- as 3 elts, "c:/foo", "c:\\foo", "x:/bar"
2241 -- Notice that no attempt is made to fully replace the 'standard'
2242 -- split marker ':' with the Windows / DOS one, ';'. The reason being
2243 -- that this will cause too much breakage for users & ':' will
2244 -- work fine even with DOS paths, if you're not insisting on being silly.
2247 splitUp (x:':':div:xs) | div `elem` dir_markers
2248 = ((x:':':div:p): splitUp rs)
2250 (p,rs) = findNextPath xs
2251 -- we used to check for existence of the path here, but that
2252 -- required the IO monad to be threaded through the command-line
2253 -- parser which is quite inconvenient. The
2254 splitUp xs = cons p (splitUp rs)
2256 (p,rs) = findNextPath xs
2261 -- will be called either when we've consumed nought or the
2262 -- "<Drive>:/" part of a DOS path, so splitting is just a Q of
2263 -- finding the next split marker.
2265 case break (`elem` split_markers) xs of
2266 (p, _:ds) -> (p, ds)
2269 split_markers :: [Char]
2270 split_markers = [':', ';']
2272 dir_markers :: [Char]
2273 dir_markers = ['/', '\\']
2276 -- -----------------------------------------------------------------------------
2277 -- tmpDir, where we store temporary files.
2279 setTmpDir :: FilePath -> DynFlags -> DynFlags
2280 setTmpDir dir dflags = dflags{ tmpDir = normalise dir }
2281 -- we used to fix /cygdrive/c/.. on Windows, but this doesn't
2282 -- seem necessary now --SDM 7/2/2008
2284 -----------------------------------------------------------------------------
2287 setOptHpcDir :: String -> DynP ()
2288 setOptHpcDir arg = upd $ \ d -> d{hpcDir = arg}
2290 -----------------------------------------------------------------------------
2291 -- Via-C compilation stuff
2293 -- There are some options that we need to pass to gcc when compiling
2294 -- Haskell code via C, but are only supported by recent versions of
2295 -- gcc. The configure script decides which of these options we need,
2296 -- and puts them in the file "extra-gcc-opts" in $topdir, which is
2297 -- read before each via-C compilation. The advantage of having these
2298 -- in a separate file is that the file can be created at install-time
2299 -- depending on the available gcc version, and even re-generated later
2300 -- if gcc is upgraded.
2302 -- The options below are not dependent on the version of gcc, only the
2305 machdepCCOpts :: DynFlags -> ([String], -- flags for all C compilations
2306 [String]) -- for registerised HC compilations
2307 machdepCCOpts _dflags
2308 #if alpha_TARGET_ARCH
2310 #ifdef HAVE_THREADED_RTS_SUPPORT
2314 -- For now, to suppress the gcc warning "call-clobbered
2315 -- register used for global register variable", we simply
2316 -- disable all warnings altogether using the -w flag. Oh well.
2318 #elif hppa_TARGET_ARCH
2319 -- ___HPUX_SOURCE, not _HPUX_SOURCE, is #defined if -ansi!
2320 -- (very nice, but too bad the HP /usr/include files don't agree.)
2321 = ( ["-D_HPUX_SOURCE"], [] )
2323 #elif m68k_TARGET_ARCH
2324 -- -fno-defer-pop : for the .hc files, we want all the pushing/
2325 -- popping of args to routines to be explicit; if we let things
2326 -- be deferred 'til after an STGJUMP, imminent death is certain!
2328 -- -fomit-frame-pointer : *don't*
2329 -- It's better to have a6 completely tied up being a frame pointer
2330 -- rather than let GCC pick random things to do with it.
2331 -- (If we want to steal a6, then we would try to do things
2332 -- as on iX86, where we *do* steal the frame pointer [%ebp].)
2333 = ( [], ["-fno-defer-pop", "-fno-omit-frame-pointer"] )
2335 #elif i386_TARGET_ARCH
2336 -- -fno-defer-pop : basically the same game as for m68k
2338 -- -fomit-frame-pointer : *must* in .hc files; because we're stealing
2339 -- the fp (%ebp) for our register maps.
2340 = let n_regs = stolen_x86_regs _dflags
2343 #if darwin_TARGET_OS
2344 -- By default, gcc on OS X will generate SSE
2345 -- instructions, which need things 16-byte aligned,
2346 -- but we don't 16-byte align things. Thus drop
2347 -- back to generic i686 compatibility. Trac #2983.
2349 -- Since Snow Leopard (10.6), gcc defaults to x86_64.
2350 ["-march=i686", "-m32"],
2352 [ if opt_Static then "-DDONT_WANT_WIN32_DLL_SUPPORT" else ""
2356 "-fomit-frame-pointer",
2357 -- we want -fno-builtin, because when gcc inlines
2358 -- built-in functions like memcpy() it tends to
2359 -- run out of registers, requiring -monly-n-regs
2361 "-DSTOLEN_X86_REGS="++show n_regs ]
2364 #elif ia64_TARGET_ARCH
2365 = ( [], ["-fomit-frame-pointer", "-G0"] )
2367 #elif x86_64_TARGET_ARCH
2369 #if darwin_TARGET_OS
2374 ["-fomit-frame-pointer",
2375 "-fno-asynchronous-unwind-tables",
2376 -- the unwind tables are unnecessary for HC code,
2377 -- and get in the way of -split-objs. Another option
2378 -- would be to throw them away in the mangler, but this
2381 -- calling builtins like strlen() using the FFI can
2382 -- cause gcc to run out of regs, so use the external
2386 #elif sparc_TARGET_ARCH
2388 -- For now, to suppress the gcc warning "call-clobbered
2389 -- register used for global register variable", we simply
2390 -- disable all warnings altogether using the -w flag. Oh well.
2392 #elif powerpc_apple_darwin_TARGET
2394 -- Disable Apple's precompiling preprocessor. It's a great thing
2395 -- for "normal" programs, but it doesn't support register variable
2397 = ( [], ["-no-cpp-precomp"] )
2402 picCCOpts :: DynFlags -> [String]
2404 #if darwin_TARGET_OS
2405 -- Apple prefers to do things the other way round.
2406 -- PIC is on by default.
2407 -- -mdynamic-no-pic:
2408 -- Turn off PIC code generation.
2410 -- Don't generate "common" symbols - these are unwanted
2411 -- in dynamic libraries.
2414 = ["-fno-common", "-U __PIC__","-D__PIC__"]
2416 = ["-mdynamic-no-pic"]
2417 #elif mingw32_TARGET_OS
2418 -- no -fPIC for Windows
2420 = ["-U __PIC__","-D__PIC__"]
2424 | opt_PIC || not opt_Static
2425 = ["-fPIC", "-U __PIC__", "-D__PIC__"]
2430 -- -----------------------------------------------------------------------------
2434 can_split = cSplitObjs == "YES"
2436 -- -----------------------------------------------------------------------------
2439 data Printable = String String
2440 | FromDynFlags (DynFlags -> String)
2442 compilerInfo :: [(String, Printable)]
2443 compilerInfo = [("Project name", String cProjectName),
2444 ("Project version", String cProjectVersion),
2445 ("Booter version", String cBooterVersion),
2446 ("Stage", String cStage),
2447 ("Have interpreter", String cGhcWithInterpreter),
2448 ("Object splitting", String cSplitObjs),
2449 ("Have native code generator", String cGhcWithNativeCodeGen),
2450 ("Support SMP", String cGhcWithSMP),
2451 ("Unregisterised", String cGhcUnregisterised),
2452 ("Tables next to code", String cGhcEnableTablesNextToCode),
2453 ("Win32 DLLs", String cEnableWin32DLLs),
2454 ("RTS ways", String cGhcRTSWays),
2455 ("Leading underscore", String cLeadingUnderscore),
2456 ("Debug on", String (show debugIsOn)),
2457 ("LibDir", FromDynFlags topDir)