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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,  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  -n  -v  -vn  -V   --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  -outputdir dir

   Keeping intermediate files
       -keep-hc-file or
                        -keep-hc-files  -keep-s-file or
                        -keep-s-files  -keep-raw-s-file or
                        -keep-raw-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          -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

   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     -XNoMonomorphismRestriction
       -XMonomorphismRrestriction      -XNoNPlusKPatterns     -XNPlusKPatterns
       -XNoMonoPatBinds  -XMonoPatBinds   -XRelaxedPolyRec  -XNoRelaxedPolyRec
       -XExtendedDefaultRules   -XNoExtendedDefaultRules   -XOverloadedStrings
       -XNoOverloadedStrings       -XGADTs      -XNoGADTs       -XTypeFamilies
       -XNoTypeFamilies      -XScopedTypeVariables     -XNoScopedTypeVariables
       -XMonoLocalBinds         -XNoMonoLocalBinds           -XTemplateHaskell
       -XNoTemplateHaskell    -XQuasiQuotes   -XNoQuasiQuotes   -XBangPatterns
       -XNoBangPatterns   -XCPP  -XNoCPP   -XPatternGuards   -XNoPatternGuards
       -XViewPatterns   -XNoViewPatterns    -XUnicodeSyntax  -XNoUnicodeSyntax
       -XMagicHash           -XNoMagicHash             -XNewQualifiedOperators
       -XNoNewQualifiedOperators       -XExplicitForALl     -XNoExplicitForAll
       -XPolymorphicComponents     -XNoPolymorphicComponents      -XRank2Types
       -XNoRank2Types    -XRankNTypes   -XNoRankNTypes    -XImpredicativeTypes
       -XNoImpredicativeTypes                      -XExistentialQuantification
       -XNoExistentialQuantification     -XKindSignatures   -XNoKindSignatures
       -XEmptyDataDecls         -XNoEmptyDataDecls          -XParallelListComp
       -XNoParallelListComp      -XTransformListComp     -XNoTransformListComp
       -XUnliftedFFITypes     -XNoUnliftedFFITypes       -XLiberalTypeSynonyms
       -XNoLiberalTypeSynonyms         -XTypeOperators       -XNoTypeOperators
       -XRecursiveDo  -XNoRecursiveDo   -XPArr   -XNoPArr    -XRecordWildCards
       -XNoRecordWildCards          -XNamedFieldPuns        -XNoNamedFieldPuns
       -XDisambiguateRecordFields                 -XNoDisambiguateRecordFields
       -XUnboxedTuples         -XNoUnboxedTuples          -XStandaloneDeriving
       -XNoStandaloneDeriving    -XDeriveDataTypeable   -XNoDeriveDataTypeable
       -XGeneralizedNewtypeDeriving             -XNoGeneralizedNewtypeDeriving
       -XTypeSynonymInstances   -XNoTypeSynonymInstances    -XFlexibleContexts
       -XNoFlexibleContexts      -XFlexibleInstances     -XNoFlexibleInstances
       -XConstrainedClassMethods                   -XNoConstrainedClassMethods
       -XMultiParamTypeClasses                       -XNoMultiParamTypeClasses
       -XFunctionalDependencies  -XNoFunctionalDependencies   -XPackageImports
       -XNoPackageImports

   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-implicit-prelude                      -fno-warn-implicit-prelude
       -fwarn-incomplete-patterns                -fno-warn-incomplete-patterns
       -fwarn-incomplete-record-updates    -fno-warn-incomplete-record-updates
       -fwarn-missing-fields  -fno-warn-missing-fields  -fwarn-missing-methods
       -fno-warn-missing-methods                     -fwarn-missing-signatures
       -fno-warn-missing-signatures                      -fwarn-name-shadowing
       -fno-warn-name-shadowing        -fwarn-orphans        -fno-warn-orphans
       -fwarn-overlapping-patterns              -fno-warn-overlapping-patterns
       -fwarn-simple-patterns      -fno-warn-simple-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

   Optimisation levels
       -O -O0  -On -O0

   Individual optimisations
       -fcase-merge    -fno-case-merge     -fdicts-strict    -fno-dicts-strict
       -fmethod-sharing         -fno-method-sharing         -fdo-eta-reduction
       -fno-do-eta-reduction                         -fdo-lambda-eta-expansion
       -fno-do-lambda-eta-expansion   -fexcess-precision -fno-excess-precision
       -fignore-asserts    -fno-ignore-asserts      -fignore-interface-pragmas
       -fno-ignore-interface-pragmas                  -fomit-interface-pragmas
       -fno-omit-interface-pragmas    -fmax-worker-args    -fsimplifier-phases
       -fmax-simplifier-iterations   -fno-state-hack   -fcse   -ffull-laziness
       -frewrite-rules   -fno-rewrite-rules    -fstrictness      -fspec-constr
       -fspec-constr-threshold=n                    -fno-spec-constr-threshold
       -fspec-constr-count=n      -fno-spec-constr-count       -fliberate-case
       -fstatic-argument-transformation            -fliberate-case-threshold=n
       -fno-liberate-case-threshold                      -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  -fno-pre-inlining  -feager-blackholing

   Profiling options
       -auto  -no-auto   -auto-all  -no-auto-all   -caf-all -no-caf-all  -prof
       -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   -fvia-C   -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   -no-link
       -split-objs  -static  -threaded  -debug   -eventlog   -fno-gen-manifest
       -fno-embed-manifest  -fno-shared-implib

   Replacing phases
       -pgmL cmd  -pgmP cmd  -pgmc cmd  -pgmm 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   -optm  option
       -opta option  -optl option  -optdll option  -optwindres option

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

   External core file options
       -fext-core

   Compiler debugging options
       -dcore-lint    -ddump-asm    -ddump-bcos    -ddump-cmm   -ddump-cpranal
       -ddump-cse   -ddump-deriv   -ddump-ds    -ddump-flatC    -ddump-foreign
       -ddump-hpc     -ddump-inlinings     -ddump-occur-anal    -ddump-opt-cmm
       -ddump-parsed   -ddump-prep   -ddump-rn    -ddump-rules    -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-rn-trace  -ddump-rn-stats  -ddump-simpl-stats  -dno-debug-output
       -dppr-debug    -dsuppress-uniques    -dppr-noprags    -dppr-user-length
       -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-asm-mangling

HELP AND VERBOSITY OPTIONS

       -?     help
                                                                        [mode]

       -help  help
                                                                        [mode]

       -n     do a dry run
                                                                     [dynamic]

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

       -vn    set verbosity level
                                                                     [dynamic]

       -V     display GHC version
                                                                        [mode]

       --supported-languages
              display the supported 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]

       -outputdir dir
              set output directory
                                                                     [dynamic]

KEEPING INTERMEDIATE FILES

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

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

       -keep-raw-s-file or
                               -keep-raw-s-files  retain  intermediate  .raw_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]

       -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
                                                                     [dynamic]

       -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]

LANGUAGE OPTIONS

       -fglasgow-exts
              Enable most language extensions
                                                                     [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
              Enable generic classes
                                                                     [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]

       -XNoMonomorphismRestriction
              Disable the monomorphism restriction
                                                                     [dynamic]

       -XNoNPlusKPatterns
              Disable support for n+k patterns
                                                                     [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]

       -XTypeFamilies
              Enable type families.
                                                                     [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]

       -XNewQualifiedOperators
              Enable new qualified operator syntax
                                                                     [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]

       -XUnliftedFFITypes
              Enable unlifted FFI types.
                                                                     [dynamic]

       -XLiberalTypeSynonyms
              Enable liberalised type synonyms.
                                                                     [dynamic]

       -XTypeOperators
              Enable type operators.
                                                                     [dynamic]

       -XRecursiveDo
              Enable recursive do (mdo) notation.
                                                                     [dynamic]

       -XPArr 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]

       -XGeneralizedNewtypeDeriving
              Enable newtype deriving.
                                                                     [dynamic]

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

       -XFlexibleContexts
              Enable flexible contexts.
                                                                     [dynamic]

       -XFlexibleInstances
              Enable flexible instances.
                                                                     [dynamic]

       -XConstrainedClassMethods
              Enable constrained class methods.
                                                                     [dynamic]

       -XMultiParamTypeClasses
              Enable multi parameter type classes.
                                                                     [dynamic]

       -XFunctionalDependencies
              Enable functional dependencies.
                                                                     [dynamic]

       -XPackageImports
              Enable package-qualified imports.
                                                                     [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-implicit-prelude
              warn when the Prelude is implicitly imported
                                                                     [dynamic]

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

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

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

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

       -fwarn-missing-signatures
              warn about top-level functions 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-simple-patterns
              warn about lambda-patterns that can fail
                                                                     [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]

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]

       -fdicts-strict
              Make dictionaries strict
                                                                      [static]

       -fmethod-sharing
              Share specialisations of overloaded functions (default)
                                                                     [dynamic]

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

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

       -fexcess-precision
              Enable excess intermediate precision
                                                                     [dynamic]

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

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

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

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

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

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

       -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]

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

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

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

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

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

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

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

       -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]

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

       -feager-blackholing
              Turn on eager blackholing
                                                                     [dynamic]

PROFILING OPTIONS

       -auto  Auto-add _scc_s to all exported functions
                                                                     [dynamic]

       -auto-all
              Auto-add _scc_s to all top-level functions
                                                                     [dynamic]

       -caf-all
              Auto-add _scc_s to all CAFs
                                                                     [dynamic]

       -prof  Turn on profiling
                                                                      [static]

       -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]

       -fvia-C
              Compile via C
                                                                     [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]

       -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]

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]

       -pgmm cmd
              Use cmd as the mangler
                                                                     [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]

       -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

       -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-asm
              Dump assembly
                                                                     [dynamic]

       -ddump-bcos
              Dump interpreter byte code
                                                                     [dynamic]

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

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

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

       -dppr-user-length
              Set the depth for printing expressions in error msgs
                                                                      [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-asm-mangling
              Turn off assembly mangling (use -unreg instead)
                                                                     [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).