Provided by: ghc_7.4.1-1ubuntu2_amd64 bug

NAME

       GHC - the Glasgow Haskell Compiler

SYNOPSIS

       ghc [option|filename]...
       ghci [option|filename]...

DESCRIPTION

       This  manual  page documents briefly the ghc and ghci commands.  Note that ghci is not yet
       available on all architectures.  Extensive documentation is  available  in  various  other
       formats including DVI, PostScript and HTML; see below.

       Each  of  GHC's  command line options is classified as either static or dynamic.  A static
       flag may only be specified on the command line, whereas a dynamic flag may also  be  given
       in an OPTIONS pragma in a source file or set from the GHCi command-line with :set.

       As  a  rule of thumb, all the language options are dynamic, as are the warning options and
       the debugging options.

       The rest are static, with the notable exceptions of -v, -cpp, -fasm, -fvia-C, -fllvm,  and
       " -#include .  The OPTIONS sections lists the status of each flag.

       Common suffixes of file names for Haskell are:

       .hs    Haskell source code; preprocess, compile

       .lhs   literate Haskell source; unlit, preprocess, compile

       .hi    Interface file; contains information about exported symbols

       .hc    intermediate C files

       .x_o   way x object files; common ways are: p, u, s

       .x_hi  way x interface files

OPTIONS

   Help and verbosity options
       -?  -help  -v  -vn  -V  --supported-extensions or --supported-languages  --info  --version
       --numeric-version  --print-libdir  -ferror-spans  -Hsize  -Rghc-timing

   Which phases to run
       -E  -C  -S  -c  -x suffix

   Alternative modes of operation
       --interactive  --make  -e expr  -M

   Redirecting output
       -hcsuf suffix  -hidir dir  -hisuf suffix  -o filename  -odir dir   -ohi  filename    -osuf
       suffix  -stubdir dir  -dumpdir dir  -outputdir dir

   Keeping intermediate files
       -keep-hc-file or
                        -keep-hc-files  -keep-llvm-file or
                        -keep-llvm-files  -keep-s-file or
                        -keep-s-files  -keep-tmp-files

   Temporary files
       -tmpdir

   Finding imports
       -idir1:dir2:...  -i

   Interface file options
       -ddump-hi  -ddump-hi-diffs  -ddump-minimal-imports  --show-iface file

   Recompilation checking
       -fforce-recomp -fno-force-recomp

   Interactive-mode options
       -ignore-dot-ghci          -ghci-script         -read-dot-ghci         -fbreak-on-exception
       -fno-break-on-exception   -fbreak-on-error   -fno-break-on-error    -fprint-evld-with-show
       -fno-print-evld-with-show             -fprint-bind-result           -fno-print-bind-result
       -fno-print-bind-contents  -fno-implicit-import-qualified

   Packages
       -package-name P  -package P  -hide-all-packages  -hide-package name  -ignore-package  name
       -package-conf  file   -no-user-package-conf  -no-auto-link-packages  -trust P  -distrust P
       -distrust-all

   Language options
       -fglasgow-exts    -fno-glasgow-exts     -XOverlappingInstances    -XNoOverlappingInstances
       -XIncoherentInstances            -XNoIncoherentInstances            -XUndecidableInstances
       -XNoUndecidableInstances          -fcontext-stack=Nn           -XArrows         -XNoArrows
       -XDisambiguateRecordFields     -XNoDisambiguateRecordFields     -XForeignFunctionInterface
       -XNoForeignFunctionInterface  -XGenerics -XNoGenerics  -XImplicitParams -XNoImplicitParams
       -firrefutable-tuples    -fno-irrefutable-tuples    -XNoImplicitPrelude   -XImplicitPrelude
       -XRebindableSyntax            -XNoRebindableSyntax             -XNoMonomorphismRestriction
       -XMonomorphismRrestriction                -XNoNPlusKPatterns              -XNPlusKPatterns
       -XNoTraditionalRecordSyntax  -XTraditionalRecordSyntax   -XNoMonoPatBinds   -XMonoPatBinds
       -XRelaxedPolyRec   -XNoRelaxedPolyRec    -XExtendedDefaultRules   -XNoExtendedDefaultRules
       -XOverloadedStrings -XNoOverloadedStrings  -XGADTs -XNoGADTs  -XGADTSyntax  -XNoGADTSyntax
       -XTypeFamilies   -XNoTypeFamilies    -XConstraintKinds   -XNoConstraintKinds   -XDataKinds
       -XNoDataKinds  -XPolyKinds  -XNoPolyKinds   -XScopedTypeVariables  -XNoScopedTypeVariables
       -XMonoLocalBinds  -XNoMonoLocalBinds  -XTemplateHaskell -XNoTemplateHaskell  -XQuasiQuotes
       -XNoQuasiQuotes    -XBangPatterns   -XNoBangPatterns    -XCPP   -XNoCPP    -XPatternGuards
       -XNoPatternGuards    -XViewPatterns  -XNoViewPatterns   -XUnicodeSyntax  -XNoUnicodeSyntax
       -XMagicHash -XNoMagicHash   -XExplicitForAll  -XNoExplicitForAll   -XPolymorphicComponents
       -XNoPolymorphicComponents    -XRank2Types   -XNoRank2Types    -XRankNTypes  -XNoRankNTypes
       -XImpredicativeTypes          -XNoImpredicativeTypes           -XExistentialQuantification
       -XNoExistentialQuantification    -XKindSignatures   -XNoKindSignatures    -XEmptyDataDecls
       -XNoEmptyDataDecls     -XParallelListComp    -XNoParallelListComp      -XTransformListComp
       -XNoTransformListComp   -XMonadComprehensions  -XNoMonadComprehensions  -XUnliftedFFITypes
       -XNoUnliftedFFITypes    -XInterruptibleFFI   -XNoInterruptibleFFI    -XLiberalTypeSynonyms
       -XNoLiberalTypeSynonyms      -XTypeOperators    -XNoTypeOperators     -XDoRec    -XNoDoRec
       -XRecursiveDo  -XNoRecursiveDo   -XParallelArrays  -XNoParallelArrays    -XRecordWildCards
       -XNoRecordWildCards    -XNamedFieldPuns   -XNoNamedFieldPuns    -XDisambiguateRecordFields
       -XNoDisambiguateRecordFields   -XUnboxedTuples   -XNoUnboxedTuples    -XStandaloneDeriving
       -XNoStandaloneDeriving    -XDeriveDataTypeable   -XNoDeriveDataTypeable    -XDeriveGeneric
       -XNoDeriveGeneric        -XGeneralizedNewtypeDeriving       -XNoGeneralizedNewtypeDeriving
       -XTypeSynonymInstances  -XNoTypeSynonymInstances   -XFlexibleContexts -XNoFlexibleContexts
       -XFlexibleInstances            -XNoFlexibleInstances             -XConstrainedClassMethods
       -XNoConstrainedClassMethods            -XDefaultSignatures           -XNoDefaultSignatures
       -XMultiParamTypeClasses        -XNoMultiParamTypeClasses          -XFunctionalDependencies
       -XNoFunctionalDependencies   -XPackageImports  -XNoPackageImports   -XSafe   -XTrustworthy
       -XUnsafe  -fpackage-trust

   Warnings
       -W    -w     -w     -Wall    -w     -Werror       -Wwarn       -fwarn-unrecognised-pragmas
       -fno-warn-unrecognised-pragmas                                -fwarn-warnings-deprecations
       -fno-warn-warnings-deprecations     -fwarn-deprecated-flags     -fno-warn-deprecated-flags
       -fwarn-duplicate-exports          -fno-warn-duplicate-exports          -fwarn-hi-shadowing
       -fno-warn-hi-shadowing   -fwarn-identities  -fno-warn-identities   -fwarn-implicit-prelude
       -fno-warn-implicit-prelude     -fwarn-incomplete-patterns    -fno-warn-incomplete-patterns
       -fwarn-incomplete-uni-patterns                           -fno-warn-incomplete-uni-patterns
       -fwarn-incomplete-record-updates                       -fno-warn-incomplete-record-updates
       -fwarn-lazy-unlifted-bindings   -fno-warn-lazy-unlifted-bindings     -fwarn-missing-fields
       -fno-warn-missing-fields      -fwarn-missing-import-lists    -fnowarn-missing-import-lists
       -fwarn-missing-methods        -fno-warn-missing-methods          -fwarn-missing-signatures
       -fno-warn-missing-signatures     -fwarn-missing-local-sigs    -fno-warn-missing-local-sigs
       -fwarn-name-shadowing    -fno-warn-name-shadowing     -fwarn-orphans     -fno-warn-orphans
       -fwarn-overlapping-patterns   -fno-warn-overlapping-patterns   -fwarn-tabs  -fno-warn-tabs
       -fwarn-type-defaults       -fno-warn-type-defaults         -fwarn-monomorphism-restriction
       -fno-warn-monomorphism-restriction        -fwarn-unused-binds       -fno-warn-unused-binds
       -fwarn-unused-imports           -fno-warn-unused-imports             -fwarn-unused-matches
       -fno-warn-unused-matches           -fwarn-unused-do-bind          -fno-warn-unused-do-bind
       -fwarn-wrong-do-bind -fno-warn-wrong-do-bind  -fwarn-unsafe -fno-warn-unsafe   -fwarn-safe
       -fno-warn-safe

   Optimisation levels
       -O -O0  -On -O0

   Individual optimisations
       -fcase-merge -fno-case-merge  -fcse   -fdicts-strict -fno-dicts-strict  -fdo-eta-reduction
       -fno-do-eta-reduction        -fdo-lambda-eta-expansion        -fno-do-lambda-eta-expansion
       -feager-blackholing   -fenable-rewrite-rules -fno-enable-rewrite-rules  -fexcess-precision
       -fno-excess-precision  -ffloat-in   -ffull-laziness   -fignore-asserts -fno-ignore-asserts
       -fignore-interface-pragmas          -fno-ignore-interface-pragmas          -fliberate-case
       -fliberate-case-threshold=n   -fno-liberate-case-threshold     -fmax-simplifier-iterations
       -fmax-worker-args        -fno-opt-coercion        -fno-pre-inlining        -fno-state-hack
       -fpedantic-bottoms             -fno-pedantic-bottoms              -fomit-interface-pragmas
       -fno-omit-interface-pragmas    -fsimplifier-phases   -fsimpl-tick-factor=n   -fspec-constr
       -fspec-constr-threshold=n        -fno-spec-constr-threshold          -fspec-constr-count=n
       -fno-spec-constr-count       -fspecialise        -fstrictness        -fstrictness=before=n
       -fstatic-argument-transformation       -funbox-strict-fields      -fno-unbox-strict-fields
       -funfolding-creation-threshold -fno-unfolding-creation-threshold  -funfolding-fun-discount
       -fno-unfolding-fun-discount    -funfolding-keeness-factor    -fno-unfolding-keeness-factor
       -funfolding-use-threshold -fno-unfolding-use-threshold

   Profiling options
       -prof   -fprof-auto  -fno-prof-auto   -fprof-auto-top -fno-prof-auto  -fprof-auto-exported
       -fno-prof-auto  -fprof-cafs -fno-prof-cafs   -fno-prof-count-entries  -fprof-count-entries
       -ticky

   Program coverage options
       -fhpc  -hpcdir dir

   Haskell pre-processor options
       -F

   C pre-processor options
       -cpp  -Dsymbol=value -U  -Usymbol  -Idir

   Code generation options
       -fasm   -fllvm   -fno-code  -fbyte-code  -fobject-code

   Linking options
       -shared   -fPIC   -dynamic   -dynload  -framework name  -framework-path name  -llib  -Ldir
       -main-is  --mk-dll  -no-hs-main   -rtsopts,  -rtsopts={none,some,all}   -with-rtsopts=opts
       -no-link    -split-objs    -static    -threaded    -debug    -eventlog   -fno-gen-manifest
       -fno-embed-manifest  -fno-shared-implib  -dylib-install-name path

   Plugin options
       -fplugin=module  -fplugin-opt=module:args

   Replacing phases
       -pgmL cmd  -pgmP cmd  -pgmc cmd  -pgms cmd  -pgma cmd  -pgml cmd  -pgmdll cmd   -pgmF  cmd
       -pgmwindres cmd

   Forcing options to particular phases
       -optL  option   -optP  option   -optF  option   -optc option  -optlo option  -optlc option
       -optm option  -opta option  -optl option  -optdll option  -optwindres option

   Platform-specific options
       -msse2  -monly-[432]-regs

   External core file options
       -fext-core

   Compiler debugging options
       -dcore-lint   -ddump-to-file   -ddump-asm   -ddump-bcos    -ddump-cmm    -ddump-core-stats
       -ddump-cpranal    -ddump-cse    -ddump-deriv    -ddump-ds    -ddump-flatC   -ddump-foreign
       -ddump-hpc     -ddump-inlinings     -ddump-llvm      -ddump-occur-anal      -ddump-opt-cmm
       -ddump-parsed     -ddump-prep     -ddump-rn    -ddump-rule-firings    -ddump-rule-rewrites
       -ddump-rules   -ddump-vect   -ddump-simpl   -ddump-simpl-phases    -ddump-simpl-iterations
       -ddump-spec    -ddump-splices    -ddump-stg    -ddump-stranal    -ddump-tc    -ddump-types
       -ddump-worker-wrapper  -ddump-if-trace  -ddump-tc-trace  -ddump-vt-trace   -ddump-rn-trace
       -ddump-rn-stats    -ddump-simpl-stats    -dno-debug-output    -dppr-debug    -dppr-noprags
       -dppr-user-length  -dppr-colsNNN   -dppr-case-as-let   -dsuppress-all   -dsuppress-uniques
       -dsuppress-idinfo           -dsuppress-module-prefixes          -dsuppress-type-signatures
       -dsuppress-type-applications  -dsuppress-coercions  -dsource-stats  -dcmm-lint  -dstg-lint
       -dstg-stats  -dverbose-core2core  -dverbose-stg2stg  -dshow-passes  -dfaststring-stats

   Misc compiler options
       -fno-hi-version-check        -dno-black-holing       -fhistory-size       -funregisterised
       -fno-ghci-history  -fno-ghci-sandbox

HELP AND VERBOSITY OPTIONS

       -?     help
                                                                                           [mode]

       -help  help
                                                                                           [mode]

       -v     verbose mode (equivalent to -v3)
                                                                                        [dynamic]

       -vn    set verbosity level
                                                                                        [dynamic]

       -V     display GHC version
                                                                                           [mode]

       --supported-extensions or --supported-languages
              display the supported languages and language extensions
                                                                                           [mode]

       --info display information about the compiler
                                                                                           [mode]

       --version
              display GHC version
                                                                                           [mode]

       --numeric-version
              display GHC version (numeric only)
                                                                                           [mode]

       --print-libdir
              display GHC library directory
                                                                                           [mode]

       -ferror-spans
              output full span in error messages
                                                                                         [static]

       -Hsize Set the minimum heap size to size
                                                                                         [static]

       -Rghc-timing
              Summarise timing stats for GHC (same as +RTS -tstderr)
                                                                                         [static]

WHICH PHASES TO RUN

       -E     Stop after preprocessing (.hspp file)
                                                                                           [mode]

       -C     Stop after generating C (.hc file)
                                                                                           [mode]

       -S     Stop after generating assembly (.s file)
                                                                                           [mode]

       -c     Do not link
                                                                                        [dynamic]

       -x suffix
              Override default behaviour for source files
                                                                                         [static]

ALTERNATIVE MODES OF OPERATION

       --interactive
              Interactive mode - normally used by just running ghci; see for details.
                                                                                           [mode]

       --make Build a multi-module Haskell  program,  automatically  figuring  out  dependencies.
              Likely to be much easier, and faster, than using make; see for details..
                                                                                           [mode]

       -e expr
              Evaluate expr; see for details.
                                                                                           [mode]

       -M     Generate dependency information suitable for use in a Makefile; see for details.
                                                                                           [mode]

REDIRECTING OUTPUT

       -hcsuf suffix
              set the suffix to use for intermediate C files
                                                                                        [dynamic]

       -hidir dir
              set directory for interface files
                                                                                        [dynamic]

       -hisuf suffix
              set the suffix to use for interface files
                                                                                        [dynamic]

       -o filename
              set output filename
                                                                                        [dynamic]

       -odir dir
              set directory for object files
                                                                                        [dynamic]

       -ohi filename
              set the filename in which to put the interface
                                                                                        [dynamic]

       -osuf suffix
              set the output file suffix
                                                                                        [dynamic]

       -stubdir dir
              redirect FFI stub files
                                                                                        [dynamic]

       -dumpdir dir
              redirect dump files
                                                                                        [dynamic]

       -outputdir dir
              set output directory
                                                                                        [dynamic]

KEEPING INTERMEDIATE FILES

       -keep-hc-file or
                               -keep-hc-files retain intermediate .hc files
                                                                                        [dynamic]

       -keep-llvm-file or
                               -keep-llvm-files retain intermediate LLVM .ll files
                                                                                        [dynamic]

       -keep-s-file or
                               -keep-s-files retain intermediate .s files
                                                                                        [dynamic]

       -keep-tmp-files
              retain all intermediate temporary files
                                                                                        [dynamic]

TEMPORARY FILES

       -tmpdir
              set the directory for temporary files
                                                                                        [dynamic]

FINDING IMPORTS

       -idir1:dir2:...
              add dir, dir2, etc. to import path
                                                                                    [static/:set]

       -i     Empty the import directory list
                                                                                    [static/:set]

INTERFACE FILE OPTIONS

       -ddump-hi
              Dump the new interface to stdout
                                                                                        [dynamic]

       -ddump-hi-diffs
              Show the differences vs. the old interface
                                                                                        [dynamic]

       -ddump-minimal-imports
              Dump a minimal set of imports
                                                                                        [dynamic]

       --show-iface file
              See .
                                                                                               []

RECOMPILATION CHECKING

       -fforce-recomp
              Turn off recompilation checking; implied by any -ddump-X option
                                                                                        [dynamic]

INTERACTIVE-MODE OPTIONS

       -ignore-dot-ghci
              Disable reading of .ghci files
                                                                                         [static]

       -ghci-script
              Load the given additional .ghci file
                                                                                         [static]

       -read-dot-ghci
              Enable reading of .ghci files
                                                                                         [static]

       -fbreak-on-exception
              Break on any exception thrown
                                                                                        [dynamic]

       -fbreak-on-error
              Break on uncaught exceptions and errors
                                                                                        [dynamic]

       -fprint-evld-with-show
              Enable usage of Show instances in :print
                                                                                        [dynamic]

       -fprint-bind-result
              Turn on printing of binding results in GHCi
                                                                                        [dynamic]

       -fno-print-bind-contents
              Turn off printing of binding contents in GHCi
                                                                                        [dynamic]

       -fno-implicit-import-qualified
              Turn off implicit qualified import of everything in GHCi
                                                                                        [dynamic]

PACKAGES

       -package-name P
              Compile to be part of package P
                                                                                         [static]

       -package P
              Expose package P
                                                                                    [static/:set]

       -hide-all-packages
              Hide all packages by default
                                                                                         [static]

       -hide-package name
              Hide package P
                                                                                    [static/:set]

       -ignore-package name
              Ignore package P
                                                                                    [static/:set]

       -package-conf file
              Load more packages from file
                                                                                         [static]

       -no-user-package-conf
              Don't load the user's package config file.
                                                                                         [static]

       -no-auto-link-packages
              Don't automatically link in the haskell98 package.
                                                                                        [dynamic]

       -trust P
              Expose package P and set it to be trusted
                                                                                    [static/:set]

       -distrust P
              Expose package P and set it to be distrusted
                                                                                    [static/:set]

       -distrust-all
              Distrust all packages by default
                                                                                    [static/:set]

LANGUAGE OPTIONS

       -fglasgow-exts
              Enable most language extensions; see for exactly which ones.
                                                                                        [dynamic]

       -XOverlappingInstances
              Enable overlapping instances
                                                                                        [dynamic]

       -XIncoherentInstances
              Enable incoherent instances. Implies -XOverlappingInstances
                                                                                        [dynamic]

       -XUndecidableInstances
              Enable undecidable instances
                                                                                        [dynamic]

       -fcontext-stack=Nn
              set the limit for context reduction. Default is 20.
                                                                                        [dynamic]

       -XArrows
              Enable arrow notation extension
                                                                                        [dynamic]

       -XDisambiguateRecordFields
              Enable record field disambiguation
                                                                                        [dynamic]

       -XForeignFunctionInterface
              Enable foreign function interface (implied by -fglasgow-exts)
                                                                                        [dynamic]

       -XGenerics
              Deprecated, does nothing. No longer enables generic classes. See also GHC's support
              for generic programming.
                                                                                        [dynamic]

       -XImplicitParams
              Enable Implicit Parameters. Implied by -fglasgow-exts.
                                                                                        [dynamic]

       -firrefutable-tuples
              Make tuple pattern matching irrefutable
                                                                                        [dynamic]

       -XNoImplicitPrelude
              Don't implicitly import Prelude
                                                                                        [dynamic]

       -XRebindableSyntax
              Employ rebindable syntax
                                                                                        [dynamic]

       -XNoMonomorphismRestriction
              Disable the monomorphism restriction
                                                                                        [dynamic]

       -XNoNPlusKPatterns
              Disable support for n+k patterns
                                                                                        [dynamic]

       -XNoTraditionalRecordSyntax
              Disable support for traditional record syntax (as supported by Haskell 98) C  {f  =
              x}
                                                                                        [dynamic]

       -XNoMonoPatBinds
              Make pattern bindings polymorphic
                                                                                        [dynamic]

       -XRelaxedPolyRec
              Relaxed checking for mutually-recursive polymorphic functions
                                                                                        [dynamic]

       -XExtendedDefaultRules
              Use GHCi's extended default rules in a normal module
                                                                                        [dynamic]

       -XOverloadedStrings
              Enable overloaded string literals.
                                                                                        [dynamic]

       -XGADTs
              Enable generalised algebraic data types.
                                                                                        [dynamic]

       -XGADTSyntax
              Enable generalised algebraic data type syntax.
                                                                                        [dynamic]

       -XTypeFamilies
              Enable type families.
                                                                                        [dynamic]

       -XConstraintKinds
              Enable a kind of constraints.
                                                                                        [dynamic]

       -XDataKinds
              Enable datatype promotion.
                                                                                        [dynamic]

       -XPolyKinds
              Enable kind polymorphism.
                                                                                        [dynamic]

       -XScopedTypeVariables
              Enable lexically-scoped type variables. Implied by -fglasgow-exts.
                                                                                        [dynamic]

       -XMonoLocalBinds
              Enable do not generalise local bindings.
                                                                                        [dynamic]

       -XTemplateHaskell
              Enable Template Haskell. No longer implied by -fglasgow-exts.
                                                                                        [dynamic]

       -XQuasiQuotes
              Enable quasiquotation.
                                                                                        [dynamic]

       -XBangPatterns
              Enable bang patterns.
                                                                                        [dynamic]

       -XCPP  Enable the C preprocessor.
                                                                                        [dynamic]

       -XPatternGuards
              Enable pattern guards.
                                                                                        [dynamic]

       -XViewPatterns
              Enable view patterns.
                                                                                        [dynamic]

       -XUnicodeSyntax
              Enable unicode syntax.
                                                                                        [dynamic]

       -XMagicHash
              Allow "#" as a postfix modifier on identifiers.
                                                                                        [dynamic]

       -XExplicitForAll
              Enable   explicit   universal  quantification.  Implied  by  -XScopedTypeVariables,
              -XLiberalTypeSynonyms,   -XRank2Types,    -XRankNTypes,    -XPolymorphicComponents,
              -XExistentialQuantification
                                                                                        [dynamic]

       -XPolymorphicComponents
              Enable polymorphic components for data constructors.
                                                                                        [dynamic]

       -XRank2Types
              Enable rank-2 types.
                                                                                        [dynamic]

       -XRankNTypes
              Enable rank-N types.
                                                                                        [dynamic]

       -XImpredicativeTypes
              Enable impredicative types.
                                                                                        [dynamic]

       -XExistentialQuantification
              Enable existential quantification.
                                                                                        [dynamic]

       -XKindSignatures
              Enable kind signatures.
                                                                                        [dynamic]

       -XEmptyDataDecls
              Enable empty data declarations.
                                                                                        [dynamic]

       -XParallelListComp
              Enable parallel list comprehensions.
                                                                                        [dynamic]

       -XTransformListComp
              Enable generalised list comprehensions.
                                                                                        [dynamic]

       -XMonadComprehensions
              Enable monad comprehensions.
                                                                                        [dynamic]

       -XUnliftedFFITypes
              Enable unlifted FFI types.
                                                                                        [dynamic]

       -XInterruptibleFFI
              Enable interruptible FFI.
                                                                                        [dynamic]

       -XLiberalTypeSynonyms
              Enable liberalised type synonyms.
                                                                                        [dynamic]

       -XTypeOperators
              Enable type operators.
                                                                                        [dynamic]

       -XDoRec
              Enable recursive do notation.
                                                                                        [dynamic]

       -XRecursiveDo
              Enable  recursive  do  (mdo)  notation. This is deprecated; please use recursive do
              notation instead.
                                                                                        [dynamic]

       -XParallelArrays
              Enable parallel arrays.
                                                                                        [dynamic]

       -XRecordWildCards
              Enable record wildcards.
                                                                                        [dynamic]

       -XNamedFieldPuns
              Enable record puns.
                                                                                        [dynamic]

       -XDisambiguateRecordFields
              Enable record field disambiguation.
                                                                                        [dynamic]

       -XUnboxedTuples
              Enable unboxed tuples.
                                                                                        [dynamic]

       -XStandaloneDeriving
              Enable standalone deriving.
                                                                                        [dynamic]

       -XDeriveDataTypeable
              Enable deriving for the Data and Typeable classes.
                                                                                        [dynamic]

       -XDeriveGeneric
              Enable deriving for the Generic class.
                                                                                        [dynamic]

       -XGeneralizedNewtypeDeriving
              Enable newtype deriving.
                                                                                        [dynamic]

       -XTypeSynonymInstances
              Enable type synonyms in instance heads.
                                                                                        [dynamic]

       -XFlexibleContexts
              Enable flexible contexts.
                                                                                        [dynamic]

       -XFlexibleInstances
              Enable flexible instances. Implies -XTypeSynonymInstances
                                                                                        [dynamic]

       -XConstrainedClassMethods
              Enable constrained class methods.
                                                                                        [dynamic]

       -XDefaultSignatures
              Enable default signatures.
                                                                                        [dynamic]

       -XMultiParamTypeClasses
              Enable multi parameter type classes.
                                                                                        [dynamic]

       -XFunctionalDependencies
              Enable functional dependencies.
                                                                                        [dynamic]

       -XPackageImports
              Enable package-qualified imports.
                                                                                        [dynamic]

       -XSafe Enable the Safe Haskell Safe mode.
                                                                                        [dynamic]

       -XTrustworthy
              Enable the Safe Haskell Trustworthy mode.
                                                                                        [dynamic]

       -XUnsafe
              Enable Safe Haskell Unsafe mode.
                                                                                        [dynamic]

       -fpackage-trust
              Enable Safe Haskell trusted package requirement for trustworty modules.
                                                                                        [dynamic]

WARNINGS

       -W     enable normal warnings
                                                                                        [dynamic]

       -w     disable all warnings
                                                                                        [dynamic]

       -Wall  enable almost all warnings (details in )
                                                                                        [dynamic]

       -Werror
              make warnings fatal
                                                                                        [dynamic]

       -Wwarn make warnings non-fatal
                                                                                        [dynamic]

       -fwarn-unrecognised-pragmas
              warn about uses of pragmas that GHC doesn't recognise
                                                                                        [dynamic]

       -fwarn-warnings-deprecations
              warn about uses of functions & types that have warnings or deprecated pragmas
                                                                                        [dynamic]

       -fwarn-deprecated-flags
              warn about uses of commandline flags that are deprecated
                                                                                        [dynamic]

       -fwarn-duplicate-exports
              warn when an entity is exported multiple times
                                                                                        [dynamic]

       -fwarn-hi-shadowing
              warn when a .hi file in the current directory shadows a library
                                                                                        [dynamic]

       -fwarn-identities
              warn about uses of Prelude numeric conversions that are probably the identity  (and
              hence could be omitted)
                                                                                        [dynamic]

       -fwarn-implicit-prelude
              warn when the Prelude is implicitly imported
                                                                                        [dynamic]

       -fwarn-incomplete-patterns
              warn when a pattern match could fail
                                                                                        [dynamic]

       -fwarn-incomplete-uni-patterns
              warn when a pattern match in a lambda expression or pattern binding could fail
                                                                                        [dynamic]

       -fwarn-incomplete-record-updates
              warn when a record update could fail
                                                                                        [dynamic]

       -fwarn-lazy-unlifted-bindings
              warn when a pattern binding looks lazy but must be strict
                                                                                        [dynamic]

       -fwarn-missing-fields
              warn when fields of a record are uninitialised
                                                                                        [dynamic]

       -fwarn-missing-import-lists
              warn when an import declaration does not explicitly list all the names brought into
              scope
                                                                                        [dynamic]

       -fwarn-missing-methods
              warn when class methods are undefined
                                                                                        [dynamic]

       -fwarn-missing-signatures
              warn about top-level functions without signatures
                                                                                        [dynamic]

       -fwarn-missing-local-sigs
              warn about polymorphic local bindings without signatures
                                                                                        [dynamic]

       -fwarn-name-shadowing
              warn when names are shadowed
                                                                                        [dynamic]

       -fwarn-orphans
              warn when the module contains orphan instance declarations or rewrite rules
                                                                                        [dynamic]

       -fwarn-overlapping-patterns
              warn about overlapping patterns
                                                                                        [dynamic]

       -fwarn-tabs
              warn if there are tabs in the source file
                                                                                        [dynamic]

       -fwarn-type-defaults
              warn when defaulting happens
                                                                                        [dynamic]

       -fwarn-monomorphism-restriction
              warn when the Monomorphism Restriction is applied
                                                                                        [dynamic]

       -fwarn-unused-binds
              warn about bindings that are unused
                                                                                        [dynamic]

       -fwarn-unused-imports
              warn about unnecessary imports
                                                                                        [dynamic]

       -fwarn-unused-matches
              warn about variables in patterns that aren't used
                                                                                        [dynamic]

       -fwarn-unused-do-bind
              warn about do bindings that appear to throw away values of types other than ()
                                                                                        [dynamic]

       -fwarn-wrong-do-bind
              warn about do bindings that appear to throw away monadic  values  that  you  should
              have bound instead
                                                                                        [dynamic]

       -fwarn-unsafe
              warn if the module being compiled is regarded to be unsafe. Should be used to check
              the safety status of modules when using safe inference.
                                                                                        [dynamic]

       -fwarn-safe
              warn if the module being compiled is regarded to be safe. Should be used  to  check
              the safety status of modules when using safe inference.
                                                                                        [dynamic]

OPTIMISATION LEVELS

       -O     Enable default optimisation (level 1)
                                                                                        [dynamic]

       -On    Set optimisation level n
                                                                                        [dynamic]

INDIVIDUAL OPTIMISATIONS

       -fcase-merge
              Enable case-merging. Implied by -O.
                                                                                        [dynamic]

       -fcse  Turn on common sub-expression elimination. Implied by -O.
                                                                                        [dynamic]

       -fdicts-strict
              Make dictionaries strict
                                                                                         [static]

       -fdo-eta-reduction
              Enable eta-reduction. Implied by -O.
                                                                                        [dynamic]

       -fdo-lambda-eta-expansion
              Enable lambda eta-reduction
                                                                                        [dynamic]

       -feager-blackholing
              Turn on eager blackholing
                                                                                        [dynamic]

       -fenable-rewrite-rules
              Switch  on all rewrite rules (including rules generated by automatic specialisation
              of overloaded functions). Implied by -O.
                                                                                        [dynamic]

       -fexcess-precision
              Enable excess intermediate precision
                                                                                        [dynamic]

       -ffloat-in
              Turn on the float-in transformation. Implied by -O.
                                                                                        [dynamic]

       -ffull-laziness
              Turn on full laziness (floating bindings outwards). Implied by -O.
                                                                                        [dynamic]

       -fignore-asserts
              Ignore assertions in the source
                                                                                        [dynamic]

       -fignore-interface-pragmas
              Ignore pragmas in interface files
                                                                                        [dynamic]

       -fliberate-case
              Turn on the liberate-case transformation. Implied by -O2.
                                                                                        [dynamic]

       -fliberate-case-threshold=n
              Set the size threshold for the liberate-case transformation to n (default: 200)
                                                                                         [static]

       -fmax-simplifier-iterations
              Set the max iterations for the simplifier
                                                                                        [dynamic]

       -fmax-worker-args
              If a worker has that many arguments, none will be unpacked anymore (default: 10)
                                                                                         [static]

       -fno-opt-coercion
              Turn off the coercion optimiser
                                                                                         [static]

       -fno-pre-inlining
              Turn off pre-inlining
                                                                                         [static]

       -fno-state-hack
              Turn off the "state hack" whereby any lambda  with  a  real-world  state  token  as
              argument is considered to be single-entry. Hence OK to inline things inside it.
                                                                                         [static]

       -fpedantic-bottoms
              Make   GHC   be   more  precise  about  its  treatment  of  bottom  (but  see  also
              -fno-state-hack). In particular, GHC will not eta-expand through a case expression.
                                                                                        [dynamic]

       -fomit-interface-pragmas
              Don't generate interface pragmas
                                                                                        [dynamic]

       -fsimplifier-phases
              Set the number of phases for the simplifier (default 2). Ignored with -O0.
                                                                                        [dynamic]

       -fsimpl-tick-factor=n
              Set the percentage factor for simplifier ticks (default 100)
                                                                                        [dynamic]

       -fspec-constr
              Turn on the SpecConstr transformation. Implied by -O2.
                                                                                        [dynamic]

       -fspec-constr-threshold=n
              Set the size threshold for the SpecConstr transformation to n (default: 200)
                                                                                         [static]

       -fspec-constr-count=n
              Set to n (default: 3) the maximum number of specialisations that  will  be  created
              for any one function by the SpecConstr transformation
                                                                                         [static]

       -fspecialise
              Turn on specialisation of overloaded functions. Implied by -O.
                                                                                        [dynamic]

       -fstrictness
              Turn on strictness analysis. Implied by -O.
                                                                                        [dynamic]

       -fstrictness=before=n
              Run an additional strictness analysis before simplifier phase n
                                                                                        [dynamic]

       -fstatic-argument-transformation
              Turn on the static argument transformation. Implied by -O2.
                                                                                        [dynamic]

       -funbox-strict-fields
              Flatten strict constructor fields
                                                                                        [dynamic]

       -funfolding-creation-threshold
              Tweak unfolding settings
                                                                                         [static]

       -funfolding-fun-discount
              Tweak unfolding settings
                                                                                         [static]

       -funfolding-keeness-factor
              Tweak unfolding settings
                                                                                         [static]

       -funfolding-use-threshold
              Tweak unfolding settings
                                                                                         [static]

PROFILING OPTIONS

       -prof  Turn on profiling
                                                                                         [static]

       -fprof-auto
              Auto-add SCCs to all bindings not marked INLINE
                                                                                        [dynamic]

       -fprof-auto-top
              Auto-add SCCs to all top-level bindings not marked INLINE
                                                                                        [dynamic]

       -fprof-auto-exported
              Auto-add SCCs to all exported bindings not marked INLINE
                                                                                        [dynamic]

       -fprof-cafs
              Auto-add SCCs to all CAFs
                                                                                        [dynamic]

       -fno-prof-count-entries
              Do not collect entry counts
                                                                                        [dynamic]

       -ticky Turn on ticky-ticky profiling
                                                                                         [static]

PROGRAM COVERAGE OPTIONS

       -fhpc  Turn on Haskell program coverage instrumentation
                                                                                         [static]

       -hpcdir dir
              Directory to deposit .mix files during compilation (default is .hpc)
                                                                                        [dynamic]

HASKELL PRE-PROCESSOR OPTIONS

       -F     Enable the use of a pre-processor (set with -pgmF)
                                                                                        [dynamic]

C PRE-PROCESSOR OPTIONS

       -cpp   Run the C pre-processor on Haskell source files
                                                                                        [dynamic]

       -Dsymbol=value
              Define a symbol in the C pre-processor
                                                                                        [dynamic]

       -Usymbol
              Undefine a symbol in the C pre-processor
                                                                                        [dynamic]

       -Idir  Add dir to the directory search list for #include files
                                                                                        [dynamic]

CODE GENERATION OPTIONS

       -fasm  Use the native code generator
                                                                                        [dynamic]

       -fllvm Compile using the LLVM code generator
                                                                                        [dynamic]

       -fno-code
              Omit code generation
                                                                                        [dynamic]

       -fbyte-code
              Generate byte-code
                                                                                        [dynamic]

       -fobject-code
              Generate object code
                                                                                        [dynamic]

LINKING OPTIONS

       -shared
              Generate a shared library (as opposed to an executable)
                                                                                        [dynamic]

       -fPIC  Generate position-independent code (where available)
                                                                                         [static]

       -dynamic
              Use dynamic Haskell libraries (if available)
                                                                                         [static]

       -dynload
              Selects one of a number of modes for finding shared libraries at runtime.
                                                                                         [static]

       -framework name
              On  Darwin/MacOS X only, link in the framework name. This option corresponds to the
              -framework option for Apple's Linker.
                                                                                        [dynamic]

       -framework-path name
              On Darwin/MacOS X only, add dir to the list of directories searched for frameworks.
              This option corresponds to the -F option for Apple's Linker.
                                                                                        [dynamic]

       -llib  Link in library lib
                                                                                        [dynamic]

       -Ldir  Add dir to the list of directories searched for libraries
                                                                                        [dynamic]

       -main-is
              Set main module and function
                                                                                        [dynamic]

       --mk-dll
              DLL-creation mode (Windows only)
                                                                                        [dynamic]

       -no-hs-main
              Don't assume this program contains main
                                                                                        [dynamic]

       -rtsopts, -rtsopts={none,some,all}
              Control  whether  the  RTS  behaviour can be tweaked via command-line flags and the
              GHCRTS environment variable. Using none means no RTS flags can be given; some means
              only  a minimum of safe options can be given (the default), and all (or no argument
              at all) means that all RTS flags are permitted.
                                                                                        [dynamic]

       -with-rtsopts=opts
              Set the default RTS options to opts.
                                                                                        [dynamic]

       -no-link
              Omit linking
                                                                                        [dynamic]

       -split-objs
              Split objects (for libraries)
                                                                                        [dynamic]

       -static
              Use static Haskell libraries
                                                                                         [static]

       -threaded
              Use the threaded runtime
                                                                                         [static]

       -debug Use the debugging runtime
                                                                                         [static]

       -eventlog
              Enable runtime event tracing
                                                                                         [static]

       -fno-gen-manifest
              Do not generate a manifest file (Windows only)
                                                                                        [dynamic]

       -fno-embed-manifest
              Do not embed the manifest in the executable (Windows only)
                                                                                        [dynamic]

       -fno-shared-implib
              Don't generate an import library for a DLL (Windows only)
                                                                                        [dynamic]

       -dylib-install-name path
              Set the install name (via -install_name passed to Apple's linker),  specifying  the
              full  install path of the library file. Any libraries or executables that link with
              it later will  pick  up  that  path  as  their  runtime  search  location  for  it.
              (Darwin/MacOS X only)
                                                                                        [dynamic]

PLUGIN OPTIONS

       -fplugin=module
              Load a plugin exported by a given module
                                                                                         [static]

       -fplugin-opt=module:args
              Give arguments to a plugin module; module must be specified with -fplugin
                                                                                         [static]

REPLACING PHASES

       -pgmL cmd
              Use cmd as the literate pre-processor
                                                                                        [dynamic]

       -pgmP cmd
              Use cmd as the C pre-processor (with -cpp only)
                                                                                        [dynamic]

       -pgmc cmd
              Use cmd as the C compiler
                                                                                        [dynamic]

       -pgms cmd
              Use cmd as the splitter
                                                                                        [dynamic]

       -pgma cmd
              Use cmd as the assembler
                                                                                        [dynamic]

       -pgml cmd
              Use cmd as the linker
                                                                                        [dynamic]

       -pgmdll cmd
              Use cmd as the DLL generator
                                                                                        [dynamic]

       -pgmF cmd
              Use cmd as the pre-processor (with -F only)
                                                                                        [dynamic]

       -pgmwindres cmd
              Use cmd as the program for embedding manifests on Windows.
                                                                                        [dynamic]

FORCING OPTIONS TO PARTICULAR PHASES

       -optL option
              pass option to the literate pre-processor
                                                                                        [dynamic]

       -optP option
              pass option to cpp (with -cpp only)
                                                                                        [dynamic]

       -optF option
              pass option to the custom pre-processor
                                                                                        [dynamic]

       -optc option
              pass option to the C compiler
                                                                                        [dynamic]

       -optlo option
              pass option to the LLVM optimiser
                                                                                        [dynamic]

       -optlc option
              pass option to the LLVM compiler
                                                                                        [dynamic]

       -optm option
              pass option to the mangler
                                                                                        [dynamic]

       -opta option
              pass option to the assembler
                                                                                        [dynamic]

       -optl option
              pass option to the linker
                                                                                        [dynamic]

       -optdll option
              pass option to the DLL generator
                                                                                        [dynamic]

       -optwindres option
              pass option to windres.
                                                                                        [dynamic]

PLATFORM-SPECIFIC OPTIONS

       -msse2 (x86 only) Use SSE2 for floating point
                                                                                        [dynamic]

       -monly-[432]-regs
              (x86 only) give some registers back to the C compiler
                                                                                        [dynamic]

EXTERNAL CORE FILE OPTIONS

       -fext-core
              Generate .hcr external Core files
                                                                                        [dynamic]

COMPILER DEBUGGING OPTIONS

       -dcore-lint
              Turn on internal sanity checking
                                                                                        [dynamic]

       -ddump-to-file
              Dump to files instead of stdout
                                                                                        [dynamic]

       -ddump-asm
              Dump assembly
                                                                                        [dynamic]

       -ddump-bcos
              Dump interpreter byte code
                                                                                        [dynamic]

       -ddump-cmm
              Dump C-- output
                                                                                        [dynamic]

       -ddump-core-stats
              Print  a  one-line  summary  of  the  size  of  the  Core program at the end of the
              optimisation pipeline
                                                                                        [dynamic]

       -ddump-cpranal
              Dump output from CPR analysis
                                                                                        [dynamic]

       -ddump-cse
              Dump CSE output
                                                                                        [dynamic]

       -ddump-deriv
              Dump deriving output
                                                                                        [dynamic]

       -ddump-ds
              Dump desugarer output
                                                                                        [dynamic]

       -ddump-flatC
              Dump `flat' C
                                                                                        [dynamic]

       -ddump-foreign
              Dump foreign export stubs
                                                                                        [dynamic]

       -ddump-hpc
              Dump after instrumentation for program coverage
                                                                                        [dynamic]

       -ddump-inlinings
              Dump inlining info
                                                                                        [dynamic]

       -ddump-llvm
              Dump LLVM intermediate code
                                                                                        [dynamic]

       -ddump-occur-anal
              Dump occurrence analysis output
                                                                                        [dynamic]

       -ddump-opt-cmm
              Dump the results of C-- to C-- optimising passes
                                                                                        [dynamic]

       -ddump-parsed
              Dump parse tree
                                                                                        [dynamic]

       -ddump-prep
              Dump prepared core
                                                                                        [dynamic]

       -ddump-rn
              Dump renamer output
                                                                                        [dynamic]

       -ddump-rule-firings
              Dump rule firing info
                                                                                        [dynamic]

       -ddump-rule-rewrites
              Dump detailed rule firing info
                                                                                        [dynamic]

       -ddump-rules
              Dump rules
                                                                                        [dynamic]

       -ddump-vect
              Dump vectoriser input and output
                                                                                        [dynamic]

       -ddump-simpl
              Dump final simplifier output
                                                                                        [dynamic]

       -ddump-simpl-phases
              Dump output from each simplifier phase
                                                                                        [dynamic]

       -ddump-simpl-iterations
              Dump output from each simplifier iteration
                                                                                        [dynamic]

       -ddump-spec
              Dump specialiser output
                                                                                        [dynamic]

       -ddump-splices
              Dump TH spliced expressions, and what they evaluate to
                                                                                        [dynamic]

       -ddump-stg
              Dump final STG
                                                                                        [dynamic]

       -ddump-stranal
              Dump strictness analyser output
                                                                                        [dynamic]

       -ddump-tc
              Dump typechecker output
                                                                                        [dynamic]

       -ddump-types
              Dump type signatures
                                                                                        [dynamic]

       -ddump-worker-wrapper
              Dump worker-wrapper output
                                                                                        [dynamic]

       -ddump-if-trace
              Trace interface files
                                                                                        [dynamic]

       -ddump-tc-trace
              Trace typechecker
                                                                                        [dynamic]

       -ddump-vt-trace
              Trace vectoriser
                                                                                        [dynamic]

       -ddump-rn-trace
              Trace renamer
                                                                                        [dynamic]

       -ddump-rn-stats
              Renamer stats
                                                                                        [dynamic]

       -ddump-simpl-stats
              Dump simplifier stats
                                                                                        [dynamic]

       -dno-debug-output
              Suppress unsolicited debugging output
                                                                                         [static]

       -dppr-debug
              Turn on debug printing (more verbose)
                                                                                         [static]

       -dppr-noprags
              Don't output pragma info in dumps
                                                                                         [static]

       -dppr-user-length
              Set the depth for printing expressions in error msgs
                                                                                         [static]

       -dppr-colsNNN
              Set the width of debugging output. For example -dppr-cols200
                                                                                         [static]

       -dppr-case-as-let
              Print single alternative case expressions as strict lets.
                                                                                         [static]

       -dsuppress-all
              In core dumps, suppress everything that is suppressable.
                                                                                         [static]

       -dsuppress-uniques
              Suppress the printing of uniques in debug output (easier to use diff)
                                                                                         [static]

       -dsuppress-idinfo
              Suppress extended information about identifiers where they are bound
                                                                                         [static]

       -dsuppress-module-prefixes
              Suppress the printing of module qualification prefixes
                                                                                         [static]

       -dsuppress-type-signatures
              Suppress type signatures
                                                                                         [static]

       -dsuppress-type-applications
              Suppress type applications
                                                                                         [static]

       -dsuppress-coercions
              Suppress the printing of coercions in Core dumps to make them shorter
                                                                                         [static]

       -dsource-stats
              Dump haskell source stats
                                                                                        [dynamic]

       -dcmm-lint
              C-- pass sanity checking
                                                                                        [dynamic]

       -dstg-lint
              STG pass sanity checking
                                                                                        [dynamic]

       -dstg-stats
              Dump STG stats
                                                                                        [dynamic]

       -dverbose-core2core
              Show output from each core-to-core pass
                                                                                        [dynamic]

       -dverbose-stg2stg
              Show output from each STG-to-STG pass
                                                                                        [dynamic]

       -dshow-passes
              Print out each pass name as it happens
                                                                                        [dynamic]

       -dfaststring-stats
              Show statistics for fast string usage when finished
                                                                                        [dynamic]

MISC COMPILER OPTIONS

       -fno-hi-version-check
              Don't complain about .hi file mismatches
                                                                                         [static]

       -dno-black-holing
              Turn off black holing (probably doesn't work)
                                                                                         [static]

       -fhistory-size
              Set simplification history size
                                                                                         [static]

       -funregisterised
              Unregisterised compilation (use -unreg instead)
                                                                                         [static]

       -fno-ghci-history
              Do not use the load/store the GHCi command history from/to ghci_history.
                                                                                        [dynamic]

       -fno-ghci-sandbox
              Turn off the GHCi sandbox. Means computations are run in the  main  thread,  rather
              than a forked thread.
                                                                                        [dynamic]

FILES

       /usr/lib

COPYRIGHT

       Copyright 2002, The University Court of the University of Glasgow.
       All rights reserved.

AUTHOR

       This  manual page was generated from the XML documentation of GHC with blood, sweat, tears
       and a breaks-if-you-look-at-it-the-wrong-way XSL stylesheet originally written by  Michael
       Weber <michaelw@debian.org> for the Debian GNU/Linux system (but may be used by others).