DynFlags.hs 58.7 KB
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{-# OPTIONS -fno-warn-missing-fields #-}
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-----------------------------------------------------------------------------
--
-- Dynamic flags
--
-- Most flags are dynamic flags, which means they can change from
-- compilation to compilation using OPTIONS_GHC pragmas, and in a
-- multi-session GHC each session can be using different dynamic
-- flags.  Dynamic flags can also be set at the prompt in GHCi.
--
-- (c) The University of Glasgow 2005
--
-----------------------------------------------------------------------------

module DynFlags (
	-- Dynamic flags
	DynFlag(..),
	DynFlags(..),
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	HscTarget(..), isObjectTarget, defaultObjectTarget,
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	GhcMode(..), isOneShot,
	GhcLink(..), isNoLink,
	PackageFlag(..),
	Option(..),

	-- Configuration of the core-to-core and stg-to-stg phases
	CoreToDo(..),
	StgToDo(..),
	SimplifierSwitch(..), 
	SimplifierMode(..), FloatOutSwitches(..),
	getCoreToDo, getStgToDo,
	
	-- Manipulating DynFlags
	defaultDynFlags,		-- DynFlags
	initDynFlags,			-- DynFlags -> IO DynFlags

	dopt,				-- DynFlag -> DynFlags -> Bool
	dopt_set, dopt_unset,		-- DynFlags -> DynFlag -> DynFlags
	getOpts,			-- (DynFlags -> [a]) -> IO [a]
	getVerbFlag,
	updOptLevel,
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	setTmpDir,
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	setPackageName,
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	-- parsing DynFlags
	parseDynamicFlags,
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        allFlags,
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	-- misc stuff
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	machdepCCOpts, picCCOpts,
    supportedLanguages,
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    compilerInfo,
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  ) where

#include "HsVersions.h"

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import Module		( Module, mkModuleName, mkModule )
import PackageConfig
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import PrelNames	( mAIN )
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#ifdef i386_TARGET_ARCH
import StaticFlags	( opt_Static )
#endif
import StaticFlags	( opt_PIC, WayName(..), v_Ways, v_Build_tag,
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			  v_RTS_Build_tag )
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import {-# SOURCE #-} Packages (PackageState)
import DriverPhases	( Phase(..), phaseInputExt )
import Config
import CmdLineParser
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import Constants	( mAX_CONTEXT_REDUCTION_DEPTH )
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import Panic		( panic, GhcException(..) )
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import UniqFM           ( UniqFM )
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import Util
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import Maybes		( orElse, fromJust )
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import SrcLoc           ( SrcSpan )
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import Outputable
import {-# SOURCE #-} ErrUtils ( Severity(..), Message, mkLocMessage )
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import Data.IORef	( readIORef )
import Control.Exception ( throwDyn )
import Control.Monad	( when )
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#ifdef mingw32_TARGET_OS
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import Data.List	( isPrefixOf )
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#else
import Util		( split )
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#endif
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import Data.Char	( isUpper, toLower )
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import System.IO        ( hPutStrLn, stderr )

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-- -----------------------------------------------------------------------------
-- DynFlags

data DynFlag

   -- debugging flags
   = Opt_D_dump_cmm
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   | Opt_D_dump_cps_cmm
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   | Opt_D_dump_asm
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   | Opt_D_dump_asm_native
   | Opt_D_dump_asm_liveness
   | Opt_D_dump_asm_coalesce
   | Opt_D_dump_asm_regalloc
   | Opt_D_dump_asm_regalloc_stages
   | Opt_D_dump_asm_conflicts
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   | Opt_D_drop_asm_stats
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   | Opt_D_dump_cpranal
   | Opt_D_dump_deriv
   | Opt_D_dump_ds
   | Opt_D_dump_flatC
   | Opt_D_dump_foreign
   | Opt_D_dump_inlinings
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   | Opt_D_dump_rule_firings
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   | Opt_D_dump_occur_anal
   | Opt_D_dump_parsed
   | Opt_D_dump_rn
   | Opt_D_dump_simpl
   | Opt_D_dump_simpl_iterations
   | Opt_D_dump_spec
   | Opt_D_dump_prep
   | Opt_D_dump_stg
   | Opt_D_dump_stranal
   | Opt_D_dump_tc
   | Opt_D_dump_types
   | Opt_D_dump_rules
   | Opt_D_dump_cse
   | Opt_D_dump_worker_wrapper
   | Opt_D_dump_rn_trace
   | Opt_D_dump_rn_stats
   | Opt_D_dump_opt_cmm
   | Opt_D_dump_simpl_stats
   | Opt_D_dump_tc_trace
   | Opt_D_dump_if_trace
   | Opt_D_dump_splices
   | Opt_D_dump_BCOs
   | Opt_D_dump_vect
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   | Opt_D_dump_hpc
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   | Opt_D_source_stats
   | Opt_D_verbose_core2core
   | Opt_D_verbose_stg2stg
   | Opt_D_dump_hi
   | Opt_D_dump_hi_diffs
   | Opt_D_dump_minimal_imports
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   | Opt_D_dump_mod_cycles
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   | Opt_D_faststring_stats
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   | Opt_DoCoreLinting
   | Opt_DoStgLinting
   | Opt_DoCmmLinting

   | Opt_WarnIsError		-- -Werror; makes warnings fatal
   | Opt_WarnDuplicateExports
   | Opt_WarnHiShadows
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   | Opt_WarnImplicitPrelude
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   | Opt_WarnIncompletePatterns
   | Opt_WarnIncompletePatternsRecUpd
   | Opt_WarnMissingFields
   | Opt_WarnMissingMethods
   | Opt_WarnMissingSigs
   | Opt_WarnNameShadowing
   | Opt_WarnOverlappingPatterns
   | Opt_WarnSimplePatterns
   | Opt_WarnTypeDefaults
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   | Opt_WarnMonomorphism
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   | Opt_WarnUnusedBinds
   | Opt_WarnUnusedImports
   | Opt_WarnUnusedMatches
   | Opt_WarnDeprecations
   | Opt_WarnDodgyImports
   | Opt_WarnOrphans
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   | Opt_WarnTabs
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   -- language opts
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   | Opt_OverlappingInstances
   | Opt_UndecidableInstances
   | Opt_IncoherentInstances
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   | Opt_MonomorphismRestriction
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   | Opt_MonoPatBinds
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   | Opt_ExtendedDefaultRules		-- Use GHC's extended rules for defaulting
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   | Opt_ForeignFunctionInterface
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   | Opt_UnliftedFFITypes
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   | Opt_PArr				-- Syntactic support for parallel arrays
   | Opt_Arrows				-- Arrow-notation syntax
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   | Opt_TemplateHaskell
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   | Opt_ImplicitParams
   | Opt_Generics
   | Opt_ImplicitPrelude 
   | Opt_ScopedTypeVariables
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   | Opt_UnboxedTuples
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   | Opt_BangPatterns
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   | Opt_TypeFamilies
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   | Opt_OverloadedStrings
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   | Opt_DisambiguateRecordFields
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   | Opt_RecordWildCards
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   | Opt_RecordPuns
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   | Opt_GADTs
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   | Opt_RelaxedPolyRec
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   | Opt_StandaloneDeriving
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   | Opt_DeriveDataTypeable
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   | Opt_TypeSynonymInstances
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   | Opt_FlexibleContexts
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   | Opt_FlexibleInstances
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   | Opt_ConstrainedClassMethods
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   | Opt_MultiParamTypeClasses
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   | Opt_FunctionalDependencies
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   | Opt_UnicodeSyntax
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   | Opt_PolymorphicComponents
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   | Opt_ExistentialQuantification
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   | Opt_MagicHash
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   | Opt_EmptyDataDecls
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   | Opt_KindSignatures
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   | Opt_PatternSignatures
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   | Opt_ParallelListComp
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   | Opt_GeneralizedNewtypeDeriving
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   | Opt_RecursiveDo
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   | Opt_PatternGuards
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   | Opt_PartiallyAppliedClosedTypeSynonyms
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   | Opt_Rank2Types
   | Opt_RankNTypes
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   | Opt_TypeOperators
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   | Opt_PrintExplicitForalls

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   -- optimisation opts
   | Opt_Strictness
   | Opt_FullLaziness
   | Opt_CSE
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   | Opt_LiberateCase
   | Opt_SpecConstr
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   | Opt_IgnoreInterfacePragmas
   | Opt_OmitInterfacePragmas
   | Opt_DoLambdaEtaExpansion
   | Opt_IgnoreAsserts
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   | Opt_IgnoreBreakpoints
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   | Opt_DoEtaReduction
   | Opt_CaseMerge
   | Opt_UnboxStrictFields
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   | Opt_DictsCheap
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   | Opt_RewriteRules
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   | Opt_Vectorise
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   | Opt_RegsGraph
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   -- misc opts
   | Opt_Cpp
   | Opt_Pp
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   | Opt_ForceRecomp
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   | Opt_DryRun
   | Opt_DoAsmMangling
   | Opt_ExcessPrecision
   | Opt_ReadUserPackageConf
   | Opt_NoHsMain
   | Opt_SplitObjs
   | Opt_StgStats
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   | Opt_HideAllPackages
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   | Opt_PrintBindResult
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   | Opt_Haddock
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   | Opt_Hpc_No_Auto
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   | Opt_BreakOnException
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   | Opt_GenManifest
   | Opt_EmbedManifest
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   -- keeping stuff
   | Opt_KeepHiDiffs
   | Opt_KeepHcFiles
   | Opt_KeepSFiles
   | Opt_KeepRawSFiles
   | Opt_KeepTmpFiles

   deriving (Eq)
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data DynFlags = DynFlags {
  ghcMode		:: GhcMode,
  ghcLink		:: GhcLink,
  coreToDo   		:: Maybe [CoreToDo], -- reserved for -Ofile
  stgToDo    		:: Maybe [StgToDo],  -- similarly
  hscTarget    		:: HscTarget,
  hscOutName 		:: String,  	-- name of the output file
  extCoreName		:: String,	-- name of the .core output file
  verbosity  		:: Int,	 	-- verbosity level
  optLevel		:: Int,		-- optimisation level
  maxSimplIterations    :: Int,		-- max simplifier iterations
  ruleCheck		:: Maybe String,
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  specThreshold		:: Int,		-- Threshold for function specialisation
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  stolen_x86_regs	:: Int,		
  cmdlineHcIncludes	:: [String],	-- -#includes
  importPaths		:: [FilePath],
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  mainModIs		:: Module,
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  mainFunIs		:: Maybe String,
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  ctxtStkDepth	        :: Int,		-- Typechecker context stack depth

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  thisPackage		:: PackageId,
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  -- ways
  wayNames		:: [WayName],	-- way flags from the cmd line
  buildTag		:: String,	-- the global "way" (eg. "p" for prof)
  rtsBuildTag		:: String,	-- the RTS "way"
  
  -- paths etc.
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  objectDir		:: Maybe String,
  hiDir			:: Maybe String,
  stubDir		:: Maybe String,

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  objectSuf		:: String,
  hcSuf			:: String,
  hiSuf			:: String,
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  outputFile		:: Maybe String,
  outputHi		:: Maybe String,

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  includePaths		:: [String],
  libraryPaths		:: [String],
  frameworkPaths	:: [String],  	-- used on darwin only
  cmdlineFrameworks	:: [String],	-- ditto
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  tmpDir		:: String,	-- no trailing '/'
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  ghcUsagePath          :: FilePath,    -- Filled in by SysTools
  ghciUsagePath         :: FilePath,    -- ditto

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  hpcDir		:: String,	-- ^ path to store the .mix files

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  -- options for particular phases
  opt_L			:: [String],
  opt_P			:: [String],
  opt_F			:: [String],
  opt_c			:: [String],
  opt_m			:: [String],
  opt_a			:: [String],
  opt_l			:: [String],
  opt_dep		:: [String],
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  opt_windres		:: [String],
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  -- commands for particular phases
  pgm_L			:: String,
  pgm_P			:: (String,[Option]),
  pgm_F			:: String,
  pgm_c			:: (String,[Option]),
  pgm_m			:: (String,[Option]),
  pgm_s			:: (String,[Option]),
  pgm_a			:: (String,[Option]),
  pgm_l			:: (String,[Option]),
  pgm_dll		:: (String,[Option]),
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  pgm_T                 :: String,
  pgm_sysman            :: String,
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  pgm_windres           :: String,
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  --  Package flags
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  extraPkgConfs		:: [FilePath],
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  topDir                :: FilePath,    -- filled in by SysTools
  systemPackageConfig   :: FilePath,    -- ditto
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	-- The -package-conf flags given on the command line, in the order
	-- they appeared.

  packageFlags		:: [PackageFlag],
	-- The -package and -hide-package flags from the command-line

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  -- Package state
  -- NB. do not modify this field, it is calculated by 
  -- Packages.initPackages and Packages.updatePackages.
  pkgDatabase           :: Maybe (UniqFM InstalledPackageInfo),
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  pkgState		:: PackageState,

  -- hsc dynamic flags
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  flags      		:: [DynFlag],
  
  -- message output
  log_action            :: Severity -> SrcSpan -> PprStyle -> Message -> IO ()
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 }

data HscTarget
  = HscC
  | HscAsm
  | HscJava
  | HscInterpreted
  | HscNothing
  deriving (Eq, Show)

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-- | will this target result in an object file on the disk?
isObjectTarget :: HscTarget -> Bool
isObjectTarget HscC     = True
isObjectTarget HscAsm   = True
isObjectTarget _        = False

-- | The 'GhcMode' tells us whether we're doing multi-module
-- compilation (controlled via the "GHC" API) or one-shot
-- (single-module) compilation.  This makes a difference primarily to
-- the "Finder": in one-shot mode we look for interface files for
-- imported modules, but in multi-module mode we look for source files
-- in order to check whether they need to be recompiled.
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data GhcMode
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  = CompManager         -- ^ --make, GHCi, etc.
  | OneShot		-- ^ ghc -c Foo.hs
  | MkDepend            -- ^ ghc -M, see Finder for why we need this
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  deriving Eq

isOneShot :: GhcMode -> Bool
isOneShot OneShot = True
isOneShot _other  = False

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-- | What kind of linking to do.
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data GhcLink	-- What to do in the link step, if there is one
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  = NoLink		-- Don't link at all
  | LinkBinary		-- Link object code into a binary
  | LinkInMemory        -- Use the in-memory dynamic linker
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  | LinkDynLib		-- Link objects into a dynamic lib (DLL on Windows, DSO on ELF platforms)
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  deriving Eq
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isNoLink :: GhcLink -> Bool
isNoLink NoLink = True
isNoLink other  = False

data PackageFlag
  = ExposePackage  String
  | HidePackage    String
  | IgnorePackage  String
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  deriving Eq
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defaultHscTarget = defaultObjectTarget

-- | the 'HscTarget' value corresponding to the default way to create
-- object files on the current platform.
defaultObjectTarget
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  | cGhcWithNativeCodeGen == "YES" 	=  HscAsm
  | otherwise				=  HscC

initDynFlags dflags = do
 -- someday these will be dynamic flags
 ways <- readIORef v_Ways
 build_tag <- readIORef v_Build_tag
 rts_build_tag <- readIORef v_RTS_Build_tag
 return dflags{
	wayNames	= ways,
	buildTag	= build_tag,
	rtsBuildTag	= rts_build_tag
	}

defaultDynFlags =
     DynFlags {
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	ghcMode			= CompManager,
	ghcLink			= LinkBinary,
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	coreToDo 		= Nothing,
	stgToDo			= Nothing, 
	hscTarget		= defaultHscTarget, 
	hscOutName		= "", 
	extCoreName		= "",
	verbosity		= 0, 
	optLevel		= 0,
	maxSimplIterations	= 4,
	ruleCheck		= Nothing,
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	specThreshold		= 200,
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	stolen_x86_regs		= 4,
	cmdlineHcIncludes	= [],
	importPaths		= ["."],
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	mainModIs		= mAIN,
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	mainFunIs		= Nothing,
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	ctxtStkDepth		= mAX_CONTEXT_REDUCTION_DEPTH,

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	thisPackage		= mainPackageId,
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	objectDir		= Nothing,
	hiDir			= Nothing,
	stubDir			= Nothing,

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	objectSuf		= phaseInputExt StopLn,
	hcSuf			= phaseInputExt HCc,
	hiSuf			= "hi",
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	outputFile		= Nothing,
	outputHi		= Nothing,
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	includePaths		= [],
	libraryPaths		= [],
	frameworkPaths		= [],
	cmdlineFrameworks	= [],
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	tmpDir			= cDEFAULT_TMPDIR,
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        hpcDir		        = ".hpc",

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	opt_L			= [],
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	opt_P			= (if opt_PIC
				   then ["-D__PIC__"]
				   else []),
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	opt_F			= [],
	opt_c			= [],
	opt_a			= [],
	opt_m			= [],
	opt_l			= [],
	opt_dep			= [],
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        opt_windres             = [],
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	extraPkgConfs		= [],
	packageFlags		= [],
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        pkgDatabase             = Nothing,
        pkgState                = panic "no package state yet: call GHC.setSessionDynFlags",
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	flags = [ 
    	    Opt_ReadUserPackageConf,
    
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	    Opt_MonoPatBinds, 	-- Experimentally, I'm making this non-standard
				-- behaviour the default, to see if anyone notices
				-- SLPJ July 06

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    	    Opt_ImplicitPrelude,
    	    Opt_MonomorphismRestriction,
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    	    Opt_DoAsmMangling,
    
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            Opt_GenManifest,
            Opt_EmbedManifest,

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	    -- on by default:
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	    Opt_PrintBindResult ]
	    ++ [f | (ns,f) <- optLevelFlags, 0 `elem` ns]
	    	    -- The default -O0 options
	    ++ standardWarnings,
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        log_action = \severity srcSpan style msg -> 
                        case severity of
                          SevInfo  -> hPutStrLn stderr (show (msg style))
                          SevFatal -> hPutStrLn stderr (show (msg style))
                          _        -> hPutStrLn stderr ('\n':show ((mkLocMessage srcSpan msg) style))
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      }

{- 
    Verbosity levels:
	
    0	|   print errors & warnings only
    1   |   minimal verbosity: print "compiling M ... done." for each module.
    2   |   equivalent to -dshow-passes
    3   |   equivalent to existing "ghc -v"
    4   |   "ghc -v -ddump-most"
    5   |   "ghc -v -ddump-all"
-}

dopt :: DynFlag -> DynFlags -> Bool
dopt f dflags  = f `elem` (flags dflags)

dopt_set :: DynFlags -> DynFlag -> DynFlags
dopt_set dfs f = dfs{ flags = f : flags dfs }

dopt_unset :: DynFlags -> DynFlag -> DynFlags
dopt_unset dfs f = dfs{ flags = filter (/= f) (flags dfs) }

getOpts :: DynFlags -> (DynFlags -> [a]) -> [a]
getOpts dflags opts = reverse (opts dflags)
	-- We add to the options from the front, so we need to reverse the list

getVerbFlag :: DynFlags -> String
getVerbFlag dflags 
  | verbosity dflags >= 3  = "-v" 
  | otherwise =  ""

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setObjectDir  f d = d{ objectDir  = f}
setHiDir      f d = d{ hiDir      = f}
setStubDir    f d = d{ stubDir    = f}

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setObjectSuf  f d = d{ objectSuf  = f}
setHiSuf      f d = d{ hiSuf      = f}
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setHcSuf      f d = d{ hcSuf      = f}

setOutputFile f d = d{ outputFile = f}
setOutputHi   f d = d{ outputHi   = f}
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-- XXX HACK: Prelude> words "'does not' work" ===> ["'does","not'","work"]
-- Config.hs should really use Option.
setPgmP   f d = let (pgm:args) = words f in d{ pgm_P   = (pgm, map Option args)}

setPgmL   f d = d{ pgm_L   = f}
setPgmF   f d = d{ pgm_F   = f}
setPgmc   f d = d{ pgm_c   = (f,[])}
setPgmm   f d = d{ pgm_m   = (f,[])}
setPgms   f d = d{ pgm_s   = (f,[])}
setPgma   f d = d{ pgm_a   = (f,[])}
setPgml   f d = d{ pgm_l   = (f,[])}
setPgmdll f d = d{ pgm_dll = (f,[])}
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setPgmwindres f d = d{ pgm_windres = f}
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addOptL   f d = d{ opt_L   = f : opt_L d}
addOptP   f d = d{ opt_P   = f : opt_P d}
addOptF   f d = d{ opt_F   = f : opt_F d}
addOptc   f d = d{ opt_c   = f : opt_c d}
addOptm   f d = d{ opt_m   = f : opt_m d}
addOpta   f d = d{ opt_a   = f : opt_a d}
addOptl   f d = d{ opt_l   = f : opt_l d}
addOptdep f d = d{ opt_dep = f : opt_dep d}
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addOptwindres f d = d{ opt_windres = f : opt_windres d}
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addCmdlineFramework f d = d{ cmdlineFrameworks = f : cmdlineFrameworks d}

-- -----------------------------------------------------------------------------
-- Command-line options

-- When invoking external tools as part of the compilation pipeline, we
-- pass these a sequence of options on the command-line. Rather than
-- just using a list of Strings, we use a type that allows us to distinguish
-- between filepaths and 'other stuff'. [The reason being, of course, that
-- this type gives us a handle on transforming filenames, and filenames only,
-- to whatever format they're expected to be on a particular platform.]

data Option
 = FileOption -- an entry that _contains_ filename(s) / filepaths.
              String  -- a non-filepath prefix that shouldn't be 
		      -- transformed (e.g., "/out=")
 	      String  -- the filepath/filename portion
 | Option     String
 
-----------------------------------------------------------------------------
-- Setting the optimisation level

updOptLevel :: Int -> DynFlags -> DynFlags
-- Set dynflags appropriate to the optimisation level
updOptLevel n dfs
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  = dfs2{ optLevel = final_n }
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  where
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   final_n = max 0 (min 2 n)	-- Clamp to 0 <= n <= 2
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   dfs1 = foldr (flip dopt_unset) dfs  remove_dopts
   dfs2 = foldr (flip dopt_set)   dfs1 extra_dopts

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   extra_dopts  = [ f | (ns,f) <- optLevelFlags, final_n `elem` ns ]
   remove_dopts = [ f | (ns,f) <- optLevelFlags, final_n `notElem` ns ]
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optLevelFlags :: [([Int], DynFlag)]
optLevelFlags
  = [ ([0],	Opt_IgnoreInterfacePragmas)
    , ([0],     Opt_OmitInterfacePragmas)
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    , ([1,2],	Opt_IgnoreAsserts)
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    , ([1,2],	Opt_RewriteRules)	-- Off for -O0; see Note [Scoping for Builtin rules]
					-- 		in PrelRules
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    , ([1,2],	Opt_DoEtaReduction)
    , ([1,2],	Opt_CaseMerge)
    , ([1,2],	Opt_Strictness)
    , ([1,2],	Opt_CSE)
    , ([1,2],	Opt_FullLaziness)
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    , ([2],	Opt_LiberateCase)
    , ([2],	Opt_SpecConstr)

    , ([0,1,2], Opt_DoLambdaEtaExpansion)
		-- This one is important for a tiresome reason:
		-- we want to make sure that the bindings for data 
		-- constructors are eta-expanded.  This is probably
		-- a good thing anyway, but it seems fragile.
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    ]

-- -----------------------------------------------------------------------------
-- Standard sets of warning options

standardWarnings
    = [ Opt_WarnDeprecations,
	Opt_WarnOverlappingPatterns,
	Opt_WarnMissingFields,
	Opt_WarnMissingMethods,
	Opt_WarnDuplicateExports
      ]

minusWOpts
    = standardWarnings ++ 
      [	Opt_WarnUnusedBinds,
	Opt_WarnUnusedMatches,
	Opt_WarnUnusedImports,
	Opt_WarnIncompletePatterns,
	Opt_WarnDodgyImports
      ]

minusWallOpts
    = minusWOpts ++
      [	Opt_WarnTypeDefaults,
	Opt_WarnNameShadowing,
	Opt_WarnMissingSigs,
	Opt_WarnHiShadows,
	Opt_WarnOrphans
      ]

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-- minuswRemovesOpts should be every warning option
minuswRemovesOpts
    = minusWallOpts ++
      [Opt_WarnImplicitPrelude,
       Opt_WarnIncompletePatternsRecUpd,
       Opt_WarnSimplePatterns,
       Opt_WarnMonomorphism,
       Opt_WarnTabs
      ]

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-- -----------------------------------------------------------------------------
-- CoreToDo:  abstraction of core-to-core passes to run.

data CoreToDo		-- These are diff core-to-core passes,
			-- which may be invoked in any order,
  			-- as many times as you like.

  = CoreDoSimplify	-- The core-to-core simplifier.
	SimplifierMode
	[SimplifierSwitch]
			-- Each run of the simplifier can take a different
			-- set of simplifier-specific flags.
  | CoreDoFloatInwards
  | CoreDoFloatOutwards FloatOutSwitches
  | CoreLiberateCase
  | CoreDoPrintCore
  | CoreDoStaticArgs
  | CoreDoStrictness
  | CoreDoWorkerWrapper
  | CoreDoSpecialising
  | CoreDoSpecConstr
  | CoreDoOldStrictness
  | CoreDoGlomBinds
  | CoreCSE
  | CoreDoRuleCheck Int{-CompilerPhase-} String	-- Check for non-application of rules 
						-- matching this string
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  | CoreDoVectorisation
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  | CoreDoNothing 		 -- Useful when building up 
  | CoreDoPasses [CoreToDo] 	 -- lists of these things
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data SimplifierMode 		-- See comments in SimplMonad
  = SimplGently
  | SimplPhase Int

data SimplifierSwitch
  = MaxSimplifierIterations Int
  | NoCaseOfCase

data FloatOutSwitches
  = FloatOutSw  Bool 	-- True <=> float lambdas to top level
		Bool	-- True <=> float constants to top level,
			-- 	    even if they do not escape a lambda


-- The core-to-core pass ordering is derived from the DynFlags:
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runWhen :: Bool -> CoreToDo -> CoreToDo
runWhen True  do_this = do_this
runWhen False do_this = CoreDoNothing
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getCoreToDo :: DynFlags -> [CoreToDo]
getCoreToDo dflags
  | Just todo <- coreToDo dflags = todo -- set explicitly by user
  | otherwise = core_todo
  where
    opt_level  	  = optLevel dflags
    max_iter   	  = maxSimplIterations dflags
    strictness    = dopt Opt_Strictness dflags
    full_laziness = dopt Opt_FullLaziness dflags
    cse           = dopt Opt_CSE dflags
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    spec_constr   = dopt Opt_SpecConstr dflags
    liberate_case = dopt Opt_LiberateCase dflags
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    rule_check    = ruleCheck dflags
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    vectorisation = dopt Opt_Vectorise dflags
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    core_todo = 
     if opt_level == 0 then
      [
	CoreDoSimplify (SimplPhase 0) [
	    MaxSimplifierIterations max_iter
	]
      ]
     else {- opt_level >= 1 -} [ 

	-- initial simplify: mk specialiser happy: minimum effort please
	CoreDoSimplify SimplGently [
			-- 	Simplify "gently"
			-- Don't inline anything till full laziness has bitten
			-- In particular, inlining wrappers inhibits floating
			-- e.g. ...(case f x of ...)...
			--  ==> ...(case (case x of I# x# -> fw x#) of ...)...
			--  ==> ...(case x of I# x# -> case fw x# of ...)...
			-- and now the redex (f x) isn't floatable any more
			-- Similarly, don't apply any rules until after full 
			-- laziness.  Notably, list fusion can prevent floating.

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            NoCaseOfCase,	-- Don't do case-of-case transformations.
				-- This makes full laziness work better
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	    MaxSimplifierIterations max_iter
	],

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        -- We run vectorisation here for now, but we might also try to run
        -- it later
        runWhen vectorisation (CoreDoPasses [
                  CoreDoVectorisation,
                  CoreDoSimplify SimplGently
                                  [NoCaseOfCase,
                                   MaxSimplifierIterations max_iter]]),

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	-- Specialisation is best done before full laziness
	-- so that overloaded functions have all their dictionary lambdas manifest
	CoreDoSpecialising,

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	runWhen full_laziness (CoreDoFloatOutwards (FloatOutSw False False)),
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	CoreDoFloatInwards,

	CoreDoSimplify (SimplPhase 2) [
		-- Want to run with inline phase 2 after the specialiser to give
		-- maximum chance for fusion to work before we inline build/augment
		-- in phase 1.  This made a difference in 'ansi' where an 
		-- overloaded function wasn't inlined till too late.
	   MaxSimplifierIterations max_iter
	],
	case rule_check of { Just pat -> CoreDoRuleCheck 2 pat; Nothing -> CoreDoNothing },

	CoreDoSimplify (SimplPhase 1) [
		-- Need inline-phase2 here so that build/augment get 
		-- inlined.  I found that spectral/hartel/genfft lost some useful
		-- strictness in the function sumcode' if augment is not inlined
		-- before strictness analysis runs
	   MaxSimplifierIterations max_iter
	],
	case rule_check of { Just pat -> CoreDoRuleCheck 1 pat; Nothing -> CoreDoNothing },

	CoreDoSimplify (SimplPhase 0) [
		-- Phase 0: allow all Ids to be inlined now
		-- This gets foldr inlined before strictness analysis

	   MaxSimplifierIterations 3
		-- At least 3 iterations because otherwise we land up with
		-- huge dead expressions because of an infelicity in the 
		-- simpifier.   
		--	let k = BIG in foldr k z xs
		-- ==>  let k = BIG in letrec go = \xs -> ...(k x).... in go xs
		-- ==>  let k = BIG in letrec go = \xs -> ...(BIG x).... in go xs
		-- Don't stop now!

	],
	case rule_check of { Just pat -> CoreDoRuleCheck 0 pat; Nothing -> CoreDoNothing },

#ifdef OLD_STRICTNESS
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	CoreDoOldStrictness,
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#endif
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	runWhen strictness (CoreDoPasses [
		CoreDoStrictness,
		CoreDoWorkerWrapper,
		CoreDoGlomBinds,
		CoreDoSimplify (SimplPhase 0) [
		   MaxSimplifierIterations max_iter
		]]),

	runWhen full_laziness 
	  (CoreDoFloatOutwards (FloatOutSw False    -- Not lambdas
					   True)),  -- Float constants
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		-- nofib/spectral/hartel/wang doubles in speed if you
		-- do full laziness late in the day.  It only happens
		-- after fusion and other stuff, so the early pass doesn't
		-- catch it.  For the record, the redex is 
		--	  f_el22 (f_el21 r_midblock)


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	runWhen cse CoreCSE,
		-- We want CSE to follow the final full-laziness pass, because it may
		-- succeed in commoning up things floated out by full laziness.
		-- CSE used to rely on the no-shadowing invariant, but it doesn't any more
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	CoreDoFloatInwards,

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	case rule_check of { Just pat -> CoreDoRuleCheck 0 pat; Nothing -> CoreDoNothing },
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		-- Case-liberation for -O2.  This should be after
		-- strictness analysis and the simplification which follows it.
	runWhen liberate_case (CoreDoPasses [
	    CoreLiberateCase,
	    CoreDoSimplify (SimplPhase 0) [
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		  MaxSimplifierIterations max_iter
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	    ] ]),	-- Run the simplifier after LiberateCase to vastly 
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			-- reduce the possiblility of shadowing
			-- Reason: see Note [Shadowing] in SpecConstr.lhs

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	runWhen spec_constr CoreDoSpecConstr,
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	-- Final clean-up simplification:
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     	CoreDoSimplify (SimplPhase 0) [
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	  MaxSimplifierIterations max_iter
	]
     ]

-- -----------------------------------------------------------------------------
-- StgToDo:  abstraction of stg-to-stg passes to run.

data StgToDo
  = StgDoMassageForProfiling  -- should be (next to) last
  -- There's also setStgVarInfo, but its absolute "lastness"
  -- is so critical that it is hardwired in (no flag).
  | D_stg_stats

getStgToDo :: DynFlags -> [StgToDo]
getStgToDo dflags
  | Just todo <- stgToDo dflags = todo -- set explicitly by user
  | otherwise = todo2
  where
	stg_stats = dopt Opt_StgStats dflags

	todo1 = if stg_stats then [D_stg_stats] else []

	todo2 | WayProf `elem` wayNames dflags
	      = StgDoMassageForProfiling : todo1
	      | otherwise
	      = todo1

-- -----------------------------------------------------------------------------
-- DynFlags parser

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allFlags :: [String]
allFlags = map ('-':) $
           [ name | (name, optkind) <- dynamic_flags, ok optkind ] ++
           map ("fno-"++) flags ++
           map ("f"++) flags
    where ok (PrefixPred _ _) = False
          ok _ = True
          flags = map fst fFlags

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dynamic_flags :: [(String, OptKind DynP)]
dynamic_flags = [
     ( "n"              , NoArg  (setDynFlag Opt_DryRun) )
  ,  ( "cpp"		, NoArg  (setDynFlag Opt_Cpp))
  ,  ( "F"		, NoArg  (setDynFlag Opt_Pp))
  ,  ( "#include"	, HasArg (addCmdlineHCInclude) )
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  ,  ( "v"		, OptIntSuffix setVerbosity )
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        ------- Specific phases  --------------------------------------------
  ,  ( "pgmL"           , HasArg (upd . setPgmL) )  
  ,  ( "pgmP"           , HasArg (upd . setPgmP) )  
  ,  ( "pgmF"           , HasArg (upd . setPgmF) )  
  ,  ( "pgmc"           , HasArg (upd . setPgmc) )  
  ,  ( "pgmm"           , HasArg (upd . setPgmm) )  
  ,  ( "pgms"           , HasArg (upd . setPgms) )  
  ,  ( "pgma"           , HasArg (upd . setPgma) )  
  ,  ( "pgml"           , HasArg (upd . setPgml) )  
  ,  ( "pgmdll"		, HasArg (upd . setPgmdll) )
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  ,  ( "pgmwindres"     , HasArg (upd . setPgmwindres) )
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  ,  ( "optL"		, HasArg (upd . addOptL) )  
  ,  ( "optP"		, HasArg (upd . addOptP) )  
  ,  ( "optF"           , HasArg (upd . addOptF) )  
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  ,  ( "optc"		, HasArg (upd . addOptc) )  
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  ,  ( "optm"		, HasArg (upd . addOptm) )  
  ,  ( "opta"		, HasArg (upd . addOpta) )  
  ,  ( "optl"		, HasArg (upd . addOptl) )  
  ,  ( "optdep"		, HasArg (upd . addOptdep) )
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  ,  ( "optwindres"     , HasArg (upd . addOptwindres) )
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  ,  ( "split-objs"	, NoArg (if can_split
				    then setDynFlag Opt_SplitObjs
				    else return ()) )

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	-------- Linking ----------------------------------------------------
  ,  ( "c"		, NoArg (upd $ \d -> d{ ghcLink=NoLink } ))
  ,  ( "no-link"	, NoArg (upd $ \d -> d{ ghcLink=NoLink } )) -- Dep.
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  ,  ( "shared"		, NoArg (upd $ \d -> d{ ghcLink=LinkDynLib } ))
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	------- Libraries ---------------------------------------------------
  ,  ( "L"		, Prefix addLibraryPath )
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  ,  ( "l"		, AnySuffix (\s -> do upd (addOptl s)))
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	------- Frameworks --------------------------------------------------
        -- -framework-path should really be -F ...
  ,  ( "framework-path" , HasArg addFrameworkPath )
  ,  ( "framework"	, HasArg (upd . addCmdlineFramework) )

	------- Output Redirection ------------------------------------------
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  ,  ( "odir"		, HasArg (upd . setObjectDir  . Just))
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  ,  ( "o"		, SepArg (upd . setOutputFile . Just))
  ,  ( "ohi"		, HasArg (upd . setOutputHi   . Just ))
  ,  ( "osuf"		, HasArg (upd . setObjectSuf))
  ,  ( "hcsuf"		, HasArg (upd . setHcSuf))
  ,  ( "hisuf"		, HasArg (upd . setHiSuf))
  ,  ( "hidir"		, HasArg (upd . setHiDir . Just))
  ,  ( "tmpdir"		, HasArg (upd . setTmpDir))
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  ,  ( "stubdir"	, HasArg (upd . setStubDir . Just))
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	------- Keeping temporary files -------------------------------------
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     -- These can be singular (think ghc -c) or plural (think ghc --make)
  ,  ( "keep-hc-file"    , NoArg (setDynFlag Opt_KeepHcFiles))
  ,  ( "keep-hc-files"   , NoArg (setDynFlag Opt_KeepHcFiles))
  ,  ( "keep-s-file"     , NoArg (setDynFlag Opt_KeepSFiles))
  ,  ( "keep-s-files"    , NoArg (setDynFlag Opt_KeepSFiles))
  ,  ( "keep-raw-s-file" , NoArg (setDynFlag Opt_KeepRawSFiles))
  ,  ( "keep-raw-s-files", NoArg (setDynFlag Opt_KeepRawSFiles))
     -- This only makes sense as plural
  ,  ( "keep-tmp-files"  , NoArg (setDynFlag Opt_KeepTmpFiles))
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	------- Miscellaneous ----------------------------------------------
  ,  ( "no-hs-main"     , NoArg (setDynFlag Opt_NoHsMain))
  ,  ( "main-is"   	, SepArg setMainIs )
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  ,  ( "haddock"	, NoArg (setDynFlag Opt_Haddock) )
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  ,  ( "hpcdir"		, SepArg setOptHpcDir )
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	------- recompilation checker (DEPRECATED, use -fforce-recomp) -----
  ,  ( "recomp"		, NoArg (unSetDynFlag Opt_ForceRecomp) )
  ,  ( "no-recomp"  	, NoArg (setDynFlag   Opt_ForceRecomp) )
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        ------- Packages ----------------------------------------------------
  ,  ( "package-conf"   , HasArg extraPkgConf_ )
  ,  ( "no-user-package-conf", NoArg (unSetDynFlag Opt_ReadUserPackageConf) )
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  ,  ( "package-name"   , HasArg (upd . setPackageName) )
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  ,  ( "package"        , HasArg exposePackage )
  ,  ( "hide-package"   , HasArg hidePackage )
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  ,  ( "hide-all-packages", NoArg (setDynFlag Opt_HideAllPackages) )
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  ,  ( "ignore-package" , HasArg ignorePackage )
  ,  ( "syslib"         , HasArg exposePackage )  -- for compatibility

	------ HsCpp opts ---------------------------------------------------
  ,  ( "D",		AnySuffix (upd . addOptP) )
  ,  ( "U",		AnySuffix (upd . addOptP) )

	------- Include/Import Paths ----------------------------------------
  ,  ( "I" 		, Prefix    addIncludePath)
  ,  ( "i"		, OptPrefix addImportPath )

	------ Debugging ----------------------------------------------------
  ,  ( "dstg-stats",	NoArg (setDynFlag Opt_StgStats))

  ,  ( "ddump-cmm",         	 setDumpFlag Opt_D_dump_cmm)
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  ,  ( "ddump-cps-cmm",        	 setDumpFlag Opt_D_dump_cps_cmm)
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  ,  ( "ddump-asm",          	 setDumpFlag Opt_D_dump_asm)
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  ,  ( "ddump-asm-native",       setDumpFlag Opt_D_dump_asm_native)
  ,  ( "ddump-asm-liveness",     setDumpFlag Opt_D_dump_asm_liveness)
  ,  ( "ddump-asm-coalesce",     setDumpFlag Opt_D_dump_asm_coalesce)
  ,  ( "ddump-asm-regalloc",     setDumpFlag Opt_D_dump_asm_regalloc)
  ,  ( "ddump-asm-conflicts",    setDumpFlag Opt_D_dump_asm_conflicts)
  ,  ( "ddump-asm-regalloc-stages",
                                 setDumpFlag Opt_D_dump_asm_regalloc_stages)
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  ,  ( "ddrop-asm-stats",        setDumpFlag Opt_D_drop_asm_stats)
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  ,  ( "ddump-cpranal",      	 setDumpFlag Opt_D_dump_cpranal)
  ,  ( "ddump-deriv",        	 setDumpFlag Opt_D_dump_deriv)
  ,  ( "ddump-ds",           	 setDumpFlag Opt_D_dump_ds)
  ,  ( "ddump-flatC",        	 setDumpFlag Opt_D_dump_flatC)
  ,  ( "ddump-foreign",      	 setDumpFlag Opt_D_dump_foreign)
  ,  ( "ddump-inlinings",    	 setDumpFlag Opt_D_dump_inlinings)
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  ,  ( "ddump-rule-firings",   	 setDumpFlag Opt_D_dump_rule_firings)
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  ,  ( "ddump-occur-anal",   	 setDumpFlag Opt_D_dump_occur_anal)
  ,  ( "ddump-parsed",       	 setDumpFlag Opt_D_dump_parsed)
  ,  ( "ddump-rn",           	 setDumpFlag Opt_D_dump_rn)
  ,  ( "ddump-simpl",        	 setDumpFlag Opt_D_dump_simpl)
  ,  ( "ddump-simpl-iterations", setDumpFlag Opt_D_dump_simpl_iterations)
  ,  ( "ddump-spec",         	 setDumpFlag Opt_D_dump_spec)
  ,  ( "ddump-prep",          	 setDumpFlag Opt_D_dump_prep)
  ,  ( "ddump-stg",          	 setDumpFlag Opt_D_dump_stg)
  ,  ( "ddump-stranal",      	 setDumpFlag Opt_D_dump_stranal)
  ,  ( "ddump-tc",           	 setDumpFlag Opt_D_dump_tc)
  ,  ( "ddump-types",        	 setDumpFlag Opt_D_dump_types)
  ,  ( "ddump-rules",        	 setDumpFlag Opt_D_dump_rules)
  ,  ( "ddump-cse",          	 setDumpFlag Opt_D_dump_cse)
  ,  ( "ddump-worker-wrapper",   setDumpFlag Opt_D_dump_worker_wrapper)
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  ,  ( "ddump-rn-trace",         setDumpFlag Opt_D_dump_rn_trace)
  ,  ( "ddump-if-trace",         setDumpFlag Opt_D_dump_if_trace)
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  ,  ( "ddump-tc-trace",         setDumpFlag Opt_D_dump_tc_trace)
  ,  ( "ddump-splices",          setDumpFlag Opt_D_dump_splices)
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  ,  ( "ddump-rn-stats",         setDumpFlag Opt_D_dump_rn_stats)
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  ,  ( "ddump-opt-cmm",          setDumpFlag Opt_D_dump_opt_cmm)
  ,  ( "ddump-simpl-stats",      setDumpFlag Opt_D_dump_simpl_stats)
  ,  ( "ddump-bcos",             setDumpFlag Opt_D_dump_BCOs)
  ,  ( "dsource-stats",          setDumpFlag Opt_D_source_stats)
  ,  ( "dverbose-core2core",     setDumpFlag Opt_D_verbose_core2core)
  ,  ( "dverbose-stg2stg",       setDumpFlag Opt_D_verbose_stg2stg)
  ,  ( "ddump-hi",               setDumpFlag Opt_D_dump_hi)
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  ,  ( "ddump-minimal-imports",  setDumpFlag Opt_D_dump_minimal_imports)
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  ,  ( "ddump-vect",         	 setDumpFlag Opt_D_dump_vect)
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  ,  ( "ddump-hpc",         	 setDumpFlag Opt_D_dump_hpc)
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  ,  ( "ddump-mod-cycles",     	 setDumpFlag Opt_D_dump_mod_cycles)
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  ,  ( "ddump-hi-diffs",         NoArg (setDynFlag Opt_D_dump_hi_diffs))
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  ,  ( "dcore-lint",       	 NoArg (setDynFlag Opt_DoCoreLinting))
  ,  ( "dstg-lint",        	 NoArg (setDynFlag Opt_DoStgLinting))
  ,  ( "dcmm-lint",		 NoArg (setDynFlag Opt_DoCmmLinting))
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  ,  ( "dshow-passes",           NoArg (do setDynFlag Opt_ForceRecomp
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				           setVerbosity (Just 2)) )
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  ,  ( "dfaststring-stats",	 NoArg (setDynFlag Opt_D_faststring_stats))
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	------ Machine dependant (-m<blah>) stuff ---------------------------

  ,  ( "monly-2-regs", 	NoArg (upd (\s -> s{stolen_x86_regs = 2}) ))
  ,  ( "monly-3-regs", 	NoArg (upd (\s -> s{stolen_x86_regs = 3}) ))
  ,  ( "monly-4-regs", 	NoArg (upd (\s -> s{stolen_x86_regs = 4}) ))

	------ Warning opts -------------------------------------------------
  ,  ( "W"		, NoArg (mapM_ setDynFlag   minusWOpts)    )
  ,  ( "Werror"		, NoArg (setDynFlag   	    Opt_WarnIsError) )
  ,  ( "Wall"		, NoArg (mapM_ setDynFlag   minusWallOpts) )
  ,  ( "Wnot"		, NoArg (mapM_ unSetDynFlag minusWallOpts) ) /* DEPREC */
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  ,  ( "w"		, NoArg (mapM_ unSetDynFlag minuswRemovesOpts) )
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	------ Optimisation flags ------------------------------------------
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  ,  ( "O"	, NoArg (upd (setOptLevel 1)))
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  ,  ( "Onot"	, NoArg (upd (setOptLevel 0))) -- deprecated
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  ,  ( "O"	, OptIntSuffix (\mb_n -> upd (setOptLevel (mb_n `orElse` 1))))
		-- If the number is missing, use 1
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  ,  ( "fmax-simplifier-iterations", IntSuffix (\n -> 
		upd (\dfs -> dfs{ maxSimplIterations = n })) )
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	-- liberate-case-threshold is an old flag for '-fspec-threshold'
  ,  ( "fspec-threshold",          IntSuffix (\n -> upd (\dfs -> dfs{ specThreshold = n })))
  ,  ( "fliberate-case-threshold", IntSuffix (\n -> upd (\dfs -> dfs{ specThreshold = n })))

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  ,  ( "frule-check", SepArg (\s -> upd (\dfs -> dfs{ ruleCheck = Just s })))
  ,  ( "fcontext-stack"	, IntSuffix $ \n -> upd $ \dfs -> dfs{ ctxtStkDepth = n })
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        ------ Compiler flags -----------------------------------------------

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  ,  ( "fasm",             NoArg (setObjTarget HscAsm) )
  ,  ( "fvia-c",           NoArg (setObjTarget HscC) )
  ,  ( "fvia-C",           NoArg (setObjTarget HscC) )
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  ,  ( "fno-code",         NoArg (setTarget HscNothing))
  ,  ( "fbyte-code",       NoArg (setTarget HscInterpreted) )
  ,  ( "fobject-code",     NoArg (setTarget defaultHscTarget) )
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  ,  ( "fglasgow-exts",    NoArg (mapM_ setDynFlag   glasgowExtsFlags) )
  ,  ( "fno-glasgow-exts", NoArg (mapM_ unSetDynFlag glasgowExtsFlags) )

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     -- the rest of the -f* and -fno-* flags
  ,  ( "f",                PrefixPred (isFlag   fFlags)
                           (\f -> setDynFlag   (getFlag   fFlags f)) )
  ,  ( "f",                PrefixPred (isPrefFlag "no-" fFlags)
                           (\f -> unSetDynFlag (getPrefFlag "no-" fFlags f)) )

     -- the -X* and -XNo* flags
  ,  ( "X",                PrefixPred (isFlag   xFlags)
                           (\f -> setDynFlag   (getFlag   xFlags f)) )
  ,  ( "X",                PrefixPred (isPrefFlag "No" xFlags)
                           (\f -> unSetDynFlag (getPrefFlag "No" xFlags f)) )
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 ]

-- these -f<blah> flags can all be reversed with -fno-<blah>

fFlags = [
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  ( "warn-dodgy-imports",               Opt_WarnDodgyImports ),
  ( "warn-duplicate-exports",           Opt_WarnDuplicateExports ),
  ( "warn-hi-shadowing",                Opt_WarnHiShadows ),
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  ( "warn-implicit-prelude",            Opt_WarnImplicitPrelude ),
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  ( "warn-incomplete-patterns",         Opt_WarnIncompletePatterns ),
  ( "warn-incomplete-record-updates",   Opt_WarnIncompletePatternsRecUpd ),
  ( "warn-missing-fields",              Opt_WarnMissingFields ),
  ( "warn-missing-methods",             Opt_WarnMissingMethods ),
  ( "warn-missing-signatures",          Opt_WarnMissingSigs ),
  ( "warn-name-shadowing",              Opt_WarnNameShadowing ),
  ( "warn-overlapping-patterns",        Opt_WarnOverlappingPatterns ),
  ( "warn-simple-patterns",             Opt_WarnSimplePatterns ),
  ( "warn-type-defaults",               Opt_WarnTypeDefaults ),
  ( "warn-monomorphism-restriction",    Opt_WarnMonomorphism ),
  ( "warn-unused-binds",                Opt_WarnUnusedBinds ),
  ( "warn-unused-imports",              Opt_WarnUnusedImports ),
  ( "warn-unused-matches",              Opt_WarnUnusedMatches ),
  ( "warn-deprecations",                Opt_WarnDeprecations ),
  ( "warn-orphans",                     Opt_WarnOrphans ),
  ( "warn-tabs",                        Opt_WarnTabs ),
  ( "print-explicit-foralls",           Opt_PrintExplicitForalls ),
  ( "strictness",                       Opt_Strictness ),
  ( "full-laziness",                    Opt_FullLaziness ),
  ( "liberate-case",                    Opt_LiberateCase ),
  ( "spec-constr",                      Opt_SpecConstr ),
  ( "cse",                              Opt_CSE ),
  ( "ignore-interface-pragmas",         Opt_IgnoreInterfacePragmas ),
  ( "omit-interface-pragmas",           Opt_OmitInterfacePragmas ),
  ( "do-lambda-eta-expansion",          Opt_DoLambdaEtaExpansion ),
  ( "ignore-asserts",                   Opt_IgnoreAsserts ),
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  ( "ignore-breakpoints",               Opt_IgnoreBreakpoints),
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  ( "do-eta-reduction",                 Opt_DoEtaReduction ),
  ( "case-merge",                       Opt_CaseMerge ),
  ( "unbox-strict-fields",              Opt_UnboxStrictFields ),
  ( "dicts-cheap",                      Opt_DictsCheap ),
  ( "excess-precision",                 Opt_ExcessPrecision ),
  ( "asm-mangling",                     Opt_DoAsmMangling ),
  ( "print-bind-result",                Opt_PrintBindResult ),
  ( "force-recomp",                     Opt_ForceRecomp ),
  ( "hpc-no-auto",                      Opt_Hpc_No_Auto ),
  ( "rewrite-rules",                    Opt_RewriteRules ),
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  ( "break-on-exception",               Opt_BreakOnException ),
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  ( "vectorise",                        Opt_Vectorise ),
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  ( "regs-graph",                       Opt_RegsGraph),
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  -- Deprecated in favour of -XTemplateHaskell:
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  ( "th",                               Opt_TemplateHaskell ),
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  -- Deprecated in favour of -XForeignFunctionInterface:
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  ( "fi",                               Opt_ForeignFunctionInterface ),
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  -- Deprecated in favour of -XForeignFunctionInterface:
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  ( "ffi",                              Opt_ForeignFunctionInterface ),
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  -- Deprecated in favour of -XArrows:
  ( "arrows",                           Opt_Arrows ),
  -- Deprecated in favour of -XGenerics:
  ( "generics",                         Opt_Generics ),
  -- Deprecated in favour of -XImplicitPrelude:
  ( "implicit-prelude",                 Opt_ImplicitPrelude ),
  -- Deprecated in favour of -XBangPatterns:
  ( "bang-patterns",                    Opt_BangPatterns ),
  -- Deprecated in favour of -XMonomorphismRestriction:
  ( "monomorphism-restriction",         Opt_MonomorphismRestriction ),
  -- Deprecated in favour of -XMonoPatBinds:
  ( "mono-pat-binds",                   Opt_MonoPatBinds ),
  -- Deprecated in favour of -XExtendedDefaultRules:
  ( "extended-default-rules",           Opt_ExtendedDefaultRules ),
  -- Deprecated in favour of -XImplicitParams:
  ( "implicit-params",                  Opt_ImplicitParams ),
  -- Deprecated in favour of -XScopedTypeVariables:
  ( "scoped-type-variables",            Opt_ScopedTypeVariables ),
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  -- Deprecated in favour of -XPArr:
  ( "parr",                             Opt_PArr ),
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  -- Deprecated in favour of -XOverlappingInstances:
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  ( "allow-overlapping-instances",      Opt_OverlappingInstances ),
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  -- Deprecated in favour of -XUndecidableInstances:
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  ( "allow-undecidable-instances",      Opt_UndecidableInstances ),
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  -- Deprecated in favour of -XIncoherentInstances:
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  ( "allow-incoherent-instances",       Opt_IncoherentInstances ),
  ( "gen-manifest",                     Opt_GenManifest ),
  ( "embed-manifest",                   Opt_EmbedManifest )
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  ]

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supportedLanguages :: [String]
supportedLanguages = map fst xFlags
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-- These -X<blah> flags can all be reversed with -XNo<blah>