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Man Pages


Manual Reference Pages  -  GHC (1)

NAME

GHC - the Glasgow Haskell Compiler

CONTENTS

Synopsis
Description
Options
     Verbosity options
     Alternative modes of operation
     Which phases to run
     Redirecting output
     Keeping intermediate files
     Temporary files
     Finding imports
     Interface file options
     Recompilation checking
     Interactive-mode options
     Packages
     Language options
     Warnings
     Optimisation levels
     Individual optimisations
     Profiling options
     Program coverage options
     Haskell pre-processor options
     C pre-processor options
     Code generation options
     Linking options
     Plugin options
     Replacing phases
     Forcing options to particular phases
     Platform-specific options
     Compiler debugging options
     Misc compiler options
Verbosity Options
Alternative Modes Of Operation
Which Phases To Run
Redirecting Output
Keeping Intermediate Files
Temporary Files
Finding Imports
Interface File Options
Recompilation Checking
Interactive-mode Options
Packages
Language Options
Warnings
Optimisation Levels
Individual Optimisations
Profiling Options
Program Coverage Options
Haskell Pre-processor Options
C Pre-processor Options
Code Generation Options
Linking Options
Plugin Options
Replacing Phases
Forcing Options To Particular Phases
Platform-specific Options
Compiler Debugging Options
Misc Compiler Options
Files
Copyright
Author

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

    Verbosity options

-v -vn -fprint-explicit-foralls -fprint-explicit-kinds -ferror-spans -Hsize -Rghc-timing

    Alternative modes of operation

--help,-? --interactive --make -e expr --show-iface -M --supported-extensions, --supported-languages --show-options --info --version, -V --numeric-version --print-libdir

    Which phases to run

-E -C -S -c -x suffix

    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 -fbreak-on-error -fno-break-on-error -fbreak-on-exception -fno-break-on-exception -fghci-hist-size=n (default is 50) -fprint-evld-with-show -fno-print-evld-with-show -fprint-bind-result -fno-print-bind-result -fno-print-bind-contents -fno-implicit-import-qualified -interactive-print

    Packages

-this-package-key P -package P -hide-all-packages -hide-package name -ignore-package name -package-db file -clear-package-db -no-global-package-db -global-package-db -no-user-package-db -user-package-db -no-auto-link-packages -trust P -distrust P -distrust-all

    Language options

-fcontext-stack=n -fglasgow-exts -fno-glasgow-exts -firrefutable-tuples -fno-irrefutable-tuples -fpackage-trust -ftype-function-depth=n -XAllowAmbiguousTypes -XNoAllowAmbiguousTypes -XArrows -XNoArrows -XAutoDeriveTypeable -XNoAutoDeriveTypeable -XBangPatterns -XNoBangPatterns -XBinaryLiterals -XNoBinaryLiterals -XCApiFFI -XNoCAPIFFI -XConstrainedClassMethods -XNoConstrainedClassMethods -XConstraintKinds -XNoConstraintKinds -XCPP -XNoCPP -XDataKinds -XNoDataKinds -XDefaultSignatures -XNoDefaultSignatures -XDeriveAnyClass -XNoDeriveAnyClass -XDeriveDataTypeable -XNoDeriveDataTypeable -XDeriveFunctor -XNoDeriveFunctor -XDeriveFoldable -XNoDeriveFoldable -XDeriveGeneric -XNoDeriveGeneric -XDeriveTraversable -XNoDeriveTraversable -XDisambiguateRecordFields -XNoDisambiguateRecordFields -XEmptyCase -XNoEmptyCase -XEmptyDataDecls -XNoEmptyDataDecls -XExistentialQuantification -XNoExistentialQuantification -XExplicitForAll -XNoExplicitForAll -XExplicitNamespaces -XNoExplicitNamespaces -XExtendedDefaultRules -XNoExtendedDefaultRules -XFlexibleContexts -XNoFlexibleContexts -XFlexibleInstances -XNoFlexibleInstances -XForeignFunctionInterface -XNoForeignFunctionInterface -XFunctionalDependencies -XNoFunctionalDependencies -XGADTs -XNoGADTs -XGADTSyntax -XNoGADTSyntax -XGeneralizedNewtypeDeriving -XNoGeneralizedNewtypeDeriving -XGenerics -XNoGenerics -XImplicitParams -XNoImplicitParams -XNoImplicitPrelude -XImplicitPrelude -XImpredicativeTypes -XNoImpredicativeTypes -XIncoherentInstances -XNoIncoherentInstances -XInstanceSigs -XNoInstanceSigs -XInterruptibleFFI -XNoInterruptibleFFI -XKindSignatures -XNoKindSignatures -XLambdaCase -XNoLambdaCase -XLiberalTypeSynonyms -XNoLiberalTypeSynonyms -XMagicHash -XNoMagicHash -XMonadComprehensions -XNoMonadComprehensions -XMonoLocalBinds -XNoMonoLocalBinds -XNoMonomorphismRestriction -XMonomorphismRestriction -XMultiParamTypeClasses -XNoMultiParamTypeClasses -XMultiWayIf -XNoMultiWayIf -XNamedFieldPuns -XNoNamedFieldPuns -XNamedWildCards -XNoNamedWildCards -XNegativeLiterals -XNoNegativeLiterals -XNoNPlusKPatterns -XNPlusKPatterns -XNullaryTypeClasses -XNoNullaryTypeClasses -XNumDecimals -XNoNumDecimals -XOverlappingInstances -XNoOverlappingInstances -XOverloadedLists -XNoOverloadedLists -XOverloadedStrings -XNoOverloadedStrings -XPackageImports -XNoPackageImports -XParallelArrays -XNoParallelArrays -XParallelListComp -XNoParallelListComp -XPartialTypeSignatures -XNoPartialTypeSignatures -XPatternGuards -XNoPatternGuards -XPatternSynonyms -XNoPatternSynonyms -XPolyKinds -XNoPolyKinds -XPolymorphicComponents -XNoPolymorphicComponents -XPostfixOperators -XNoPostfixOperators -XQuasiQuotes -XNoQuasiQuotes -XRank2Types -XNoRank2Types -XRankNTypes -XNoRankNTypes -XRebindableSyntax -XNoRebindableSyntax -XRecordWildCards -XNoRecordWildCards -XRecursiveDo -XNoRecursiveDo -XRelaxedPolyRec -XNoRelaxedPolyRec -XRoleAnnotations -XNoRoleAnnotations -XSafe -XScopedTypeVariables -XNoScopedTypeVariables -XStandaloneDeriving -XNoStandaloneDeriving -XTemplateHaskell -XNoTemplateHaskell -XNoTraditionalRecordSyntax -XTraditionalRecordSyntax -XTransformListComp -XNoTransformListComp -XTrustworthy -XTupleSections -XNoTupleSections -XTypeFamilies -XNoTypeFamilies -XTypeOperators -XNoTypeOperators -XTypeSynonymInstances -XNoTypeSynonymInstances -XUnboxedTuples -XNoUnboxedTuples -XUndecidableInstances -XNoUndecidableInstances -XUnicodeSyntax -XNoUnicodeSyntax -XUnliftedFFITypes -XNoUnliftedFFITypes -XUnsafe -XViewPatterns -XNoViewPatterns

    Warnings

-W -w -w -Wall -w -Werror -Wwarn -fdefer-type-errors -fno-defer-type-errors -fdefer-typed-holes -fno-defer-typed-holes -fhelpful-errors -fno-helpful-errors -fwarn-deprecated-flags -fno-warn-deprecated-flags -fwarn-duplicate-constraints -fno-warn-duplicate-constraints -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-exported-sigs -fno-warn-missing-exported-sigs -fwarn-missing-local-sigs -fno-warn-missing-local-sigs -fwarn-monomorphism-restriction -fno-warn-monomorphism-restriction -fwarn-name-shadowing -fno-warn-name-shadowing -fwarn-orphans, -fwarn-auto-orphans -fno-warn-orphans, -fno-warn-auto-orphans -fwarn-overlapping-patterns -fno-warn-overlapping-patterns -fwarn-tabs -fno-warn-tabs -fwarn-type-defaults -fno-warn-type-defaults -fwarn-unrecognised-pragmas -fno-warn-unrecognised-pragmas -fwarn-unticked-promoted-constructors -fno-warn-unticked-promoted-constructors -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 -fwarn-trustworthy-safe -fno-warn-safe -fwarn-warnings-deprecations -fno-warn-warnings-deprecations -fwarn-amp -fno-warn-amp -fwarn-typed-holes -fno-warn-typed-holes -fwarn-partial-type-signatures -fno-warn-partial-type-signatures -fwarn-deriving-typeable -fno-warn-deriving-typeable

    Optimisation levels

-O0 -O -O or -O1 -O0 -O2 -O0 -Odph

    Individual optimisations

-fcall-arity -fno-call-arity -fcase-merge -fno-case-merge -fcmm-elim-common-blocks -fno-cmm-elim-common-blocks -fcmm-sink -fno-cmm-sink -fcpr-off -fcse -fno-cse -fdicts-cheap -fno-dicts-cheap -fdicts-strict -fno-dicts-strict -fdmd-tx-dict-sel
-fno-dmd-tx-dict-sel -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 -fexpose-all-unfoldings -fno-expose-all-unfoldings -ffloat-in -fno-float-in -ffull-laziness -fno-full-laziness -ffun-to-thunk -fno-fun-to-thunk -fignore-asserts -fno-ignore-asserts -fignore-interface-pragmas -fno-ignore-interface-pragmas -flate-dmd-anal -fno-late-dmd-anal -fliberate-case -fliberate-case-threshold=n -fno-liberate-case-threshold -floopification -fno-loopification -fmax-inline-alloc-size=n
-fmax-inline-memcpy-insns=n

-fmax-inline-memset-insns=n
-fmax-relevant-binds=n -fno-max-relevant-bindings -fmax-simplifier-iterations=n -fmax-worker-args=n -fno-opt-coercion -fno-pre-inlining -fno-state-hack -fomit-interface-pragmas -fno-omit-interface-pragmas -fomit-yields -fno-omit-yields -fpedantic-bottoms -fno-pedantic-bottoms -fregs-graph -fno-regs-graph -fregs-iterative -fno-regs-iterative -fsimplifier-phases=n -fsimpl-tick-factor=n -fspec-constr -fno-spec-constr -fspec-constr-count=n -fno-spec-constr-count -fspec-constr-threshold=n -fno-spec-constr-threshold -fspecialise -fno-specialise -fstatic-argument-transformation -fno-static-argument-transformation -fstrictness -fno-strictness -fstrictness-before=n -funbox-small-strict-fields -fno-unbox-small-strict-fields -funbox-strict-fields -fno-unbox-strict-fields -funfolding-creation-threshold=n -funfolding-dict-discount=n -funfolding-fun-discount=n -funfolding-keeness-factor=n -funfolding-use-threshold=n -fvectorisation-avoidance -fno-vectorisation-avoidance -fvectorise -fno-vectorise

    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 -fwrite-interface -fbyte-code -fobject-code

    Linking options

-shared -staticlib -fPIC -dynamic -dynamic-too -dyno -dynosuf -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 -ticky -eventlog -fno-gen-manifest -fno-embed-manifest -fno-shared-implib -dylib-install-name path -rdynamic

    Plugin options

-fplugin=module -fplugin-opt=module:args

    Replacing phases

-pgmL cmd -pgmP cmd -pgmc cmd -pgmlo cmd -pgmlc cmd -pgms cmd -pgma cmd -pgml cmd -pgmdll cmd -pgmF cmd -pgmwindres cmd -pgmlibtool cmd

    Forcing options to particular phases

-optL option -optP option -optF option -optc option -optlo option -optlc option -opta option -optl option -optdll option -optwindres option

    Platform-specific options

-msse2

    Compiler debugging options

-dcore-lint -ddump-to-file -ddump-asm -ddump-bcos -ddump-cmm -ddump-core-stats -ddump-cse -ddump-deriv -ddump-ds -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-iterations -ddump-spec -ddump-splices -ddump-stg -ddump-stranal -ddump-strsigs -ddump-tc -dth-dec-file -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-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 -frule-check

    Misc compiler options

-jN -fno-hi-version-check -fhistory-size -fno-ghci-history -fno-ghci-sandbox

VERBOSITY OPTIONS

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

-vn set verbosity level [dynamic]

-fprint-explicit-foralls
  print explicit forall quantification in types [dynamic]

-fprint-explicit-kinds
  print explicit kind foralls and kind arguments in types [dynamic]

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

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

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

ALTERNATIVE MODES OF OPERATION

--help,-? Disply help [mode]

--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]

--show-iface
  Display the contents of an interface file. [mode]

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

--supported-extensions, --supported-languages
  display the supported language extensions [mode]

--show-options
  display the supported command line options [mode]

--info display information about the compiler [mode]

--version, -V
  display GHC version [mode]

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

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

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 Stop after generating object (.o) file [mode]

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

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 [dynamic/:set]

-i Empty the import directory list [dynamic/: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. This is implied by any -ddump-X option when compiling a single file (i.e. when using -c). [dynamic]

INTERACTIVE-MODE OPTIONS

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

-ghci-script
  Read additional .ghci files [dynamic]

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

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

-fghci-hist-size=n
  Set the number of entries GHCi keeps for :history [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]

-interactive-print
  Select the function to use for printing evaluated expressions in GHCi [dynamic]

PACKAGES

-this-package-key P
  Compile to be part of package P [dynamic]

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

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

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

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

-package-db file
  Add file to the package db stack. [dynamic]

-clear-package-db
  Clear the package db stack. [dynamic]

-no-global-package-db
  Remove the global package db from the stack. [dynamic]

-global-package-db
  Add the global package db to the stack. [dynamic]

-no-user-package-db
  Remove the user’s package db from the stack. [dynamic]

-user-package-db
  Add the user’s package db to the stack. [dynamic]

-no-auto-link-packages
  Don’t automatically link in the base and rts packages. [dynamic]

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

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

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

LANGUAGE OPTIONS

-fcontext-stack=n
  set the limit for type-class context reduction. Default is 100. [dynamic]

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

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

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

-ftype-function-depth=n
  set the limit for type function reductions. Default is 200. [dynamic]

-XAllowAmbiguousTypes
  Allow the user to write ambiguous types, and the type inference engine to infer them. [dynamic]

-XArrows
  Enable arrow notation extension [dynamic]

-XAutoDeriveTypeable
  As of GHC 7.10, this option is not needed, and should not be used. Automatically derive Typeable instances for every datatype and type class declaration. Implies -XDeriveDataTypeable. [dynamic]

-XBangPatterns
  Enable bang patterns. [dynamic]

-XBinaryLiterals
  Enable support for binary literals. [dynamic]

-XCApiFFI
  Enable the CAPI calling convention. [dynamic]

-XConstrainedClassMethods
  Enable constrained class methods. [dynamic]

-XConstraintKinds
  Enable a kind of constraints. [dynamic]

-XCPP Enable the C preprocessor. [dynamic]

-XDataKinds
  Enable datatype promotion. [dynamic]

-XDefaultSignatures
  Enable default signatures. [dynamic]

-XDeriveAnyClass
  Enable deriving for any class. [dynamic]

-XDeriveDataTypeable
  Enable deriving for the Data class. Implied by -XAutoDeriveTypeable. [dynamic]

-XDeriveFunctor
  Enable deriving for the Functor class. Implied by -XDeriveTraversable. [dynamic]

-XDeriveFoldable
  Enable deriving for the Foldable class. Implied by -XDeriveTraversable. [dynamic]

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

-XDeriveTraversable
  Enable deriving for the Traversable class. Implies -XDeriveFunctor and -XDeriveFoldable. [dynamic]

-XDisambiguateRecordFields
  Enable record field disambiguation. Implied by -XRecordWildCards. [dynamic]

-XEmptyCase
  Allow empty case alternatives. [dynamic]

-XEmptyDataDecls
  Enable empty data declarations. [dynamic]

-XExistentialQuantification
  Enable existential quantification. [dynamic]

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

-XExplicitNamespaces
  Enable using the keyword type to specify the namespace of entries in imports and exports (). Implied by -XTypeOperators and -XTypeFamilies. [dynamic]

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

-XFlexibleContexts
  Enable flexible contexts. Implied by -XImplicitParams. [dynamic]

-XFlexibleInstances
  Enable flexible instances. Implies -XTypeSynonymInstances. Implied by -XImplicitParams. [dynamic]

-XForeignFunctionInterface
  Enable foreign function interface. [dynamic]

-XFunctionalDependencies
  Enable functional dependencies. Implies -XMultiParamTypeClasses. [dynamic]

-XGADTs Enable generalised algebraic data types. Implies -XGADTSyntax and -XMonoLocalBinds. [dynamic]

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

-XGeneralizedNewtypeDeriving
  Enable newtype deriving. [dynamic]

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

-XImplicitParams
  Enable Implicit Parameters. Implies -XFlexibleContexts and -XFlexibleInstances. [dynamic]

-XNoImplicitPrelude
  Don’t implicitly import Prelude. Implied by -XRebindableSyntax. [dynamic]

-XImpredicativeTypes
  Enable impredicative types. Implies -XRankNTypes. [dynamic]

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

-XInstanceSigs
  Enable instance signatures. [dynamic]

-XInterruptibleFFI
  Enable interruptible FFI. [dynamic]

-XKindSignatures
  Enable kind signatures. Implied by -XTypeFamilies and -XPolyKinds. [dynamic]

-XLambdaCase
  Enable lambda-case expressions. [dynamic]

-XLiberalTypeSynonyms
  Enable liberalised type synonyms. [dynamic]

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

-XMonadComprehensions
  Enable monad comprehensions. [dynamic]

-XMonoLocalBinds
  Enable do not generalise local bindings. Implied by -XTypeFamilies and -XGADTs. [dynamic]

-XNoMonomorphismRestriction
  Disable the monomorphism restriction. [dynamic]

-XMultiParamTypeClasses
  Enable multi parameter type classes. Implied by -XFunctionalDependencies. [dynamic]

-XMultiWayIf
  Enable multi-way if-expressions. [dynamic]

-XNamedFieldPuns
  Enable record puns. [dynamic]

-XNamedWildCards
  Enable named wildcards. [dynamic]

-XNegativeLiterals
  Enable support for negative literals. [dynamic]

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

-XNullaryTypeClasses
  Deprecated, does nothing. nullary (no parameter) type classes are now enabled using -XMultiParamTypeClasses. [dynamic]

-XNumDecimals
  Enable support for ’fractional’ integer literals. [dynamic]

-XOverlappingInstances
  Enable overlapping instances. [dynamic]

-XOverloadedLists
  Enable overloaded lists. [dynamic]

-XOverloadedStrings
  Enable overloaded string literals. [dynamic]

-XPackageImports
  Enable package-qualified imports. [dynamic]

-XParallelArrays
  Enable parallel arrays. Implies -XParallelListComp. [dynamic]

-XParallelListComp
  Enable parallel list comprehensions. Implied by -XParallelArrays. [dynamic]

-XPartialTypeSignatures
  Enable partial type signatures. [dynamic]

-XPatternGuards
  Enable pattern guards. [dynamic]

-XPatternSynonyms
  Enable pattern synonyms. [dynamic]

-XPolyKinds
  Enable kind polymorphism. Implies -XKindSignatures. [dynamic]

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

-XPostfixOperators
  Enable postfix operators. [dynamic]

-XQuasiQuotes
  Enable quasiquotation. [dynamic]

-XRank2Types
  Enable rank-2 types. [dynamic, synonym for -XRankNTypes]

-XRankNTypes
  Enable rank-N types. Implied by -XImpredicativeTypes. [dynamic]

-XRebindableSyntax
  Employ rebindable syntax. Implies -XNoImplicitPrelude. [dynamic]

-XRecordWildCards
  Enable record wildcards. Implies -XDisambiguateRecordFields. [dynamic]

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

-XRelaxedPolyRec
  (deprecated) Relaxed checking for mutually-recursive polymorphic functions. [dynamic]

-XRoleAnnotations
  Enable role annotations. [dynamic]

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

-XScopedTypeVariables
  Enable lexically-scoped type variables. [dynamic]

-XStandaloneDeriving
  Enable standalone deriving. [dynamic]

-XTemplateHaskell
  Enable Template Haskell. [dynamic]

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

-XTransformListComp
  Enable generalised list comprehensions. [dynamic]

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

-XTupleSections
  Enable tuple sections. [dynamic]

-XTypeFamilies
  Enable type families. Implies -XExplicitNamespaces, -XKindSignatures and -XMonoLocalBinds. [dynamic]

-XTypeOperators
  Enable type operators. Implies -XExplicitNamespaces. [dynamic]

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

-XUnboxedTuples
  Enable unboxed tuples. [dynamic]

-XUndecidableInstances
  Enable undecidable instances. [dynamic]

-XUnicodeSyntax
  Enable unicode syntax. [dynamic]

-XUnliftedFFITypes
  Enable unlifted FFI types. [dynamic]

-XUnsafe
  Enable Safe Haskell Unsafe mode. [dynamic]

-XViewPatterns
  Enable view patterns. [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]

-fdefer-type-errors
  Turn type errors into warnings, deferring the error until runtime. Implies -fdefer-typed-holes. [dynamic]

-fdefer-typed-holes
  Convert typed hole errors into warnings, deferring the error until runtime. Implied by -fdefer-type-errors. See also -fwarn-typed-holes. [dynamic]

-fhelpful-errors
  Make suggestions for mis-spelled names. [dynamic]

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

-fwarn-duplicate-constraints
  warn when a constraint appears duplicated in a type signature [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
  (deprecated) 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-exported-sigs
  warn about top-level functions without signatures, only if they are exported. takes precedence over -fwarn-missing-signatures [dynamic]

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

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

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

-fwarn-orphans, -fwarn-auto-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-unrecognised-pragmas
  warn about uses of pragmas that GHC doesn’t recognise [dynamic]

-fwarn-unticked-promoted-constructors
  warn if promoted constructors are not ticked [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. Works on all module types, even those using explicit Safe Haskell modes (such as -XTrustworthy) and so can be used to have the compiler check any assumptions made. [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. Works on all module types, even those using explicit Safe Haskell modes (such as -XTrustworthy) and so can be used to have the compiler check any assumptions made. [dynamic]

-fwarn-trustworthy-safe
  warn if the module being compiled is marked as -XTrustworthy but it could instead be marked as -XSafe, a more informative bound. Can be used to detect once a Safe Haskell bound can be improved as dependencies are updated. [dynamic]

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

-fwarn-amp
  (deprecated) warn on definitions conflicting with the Applicative-Monad Proposal (AMP) [dynamic]

-fwarn-typed-holes
  Report warnings when typed hole errors are deferred until runtime. See -fdefer-typed-holes. [dynamic]

-fwarn-partial-type-signatures
  warn about holes in partial type signatures when -XPartialTypesignatures is enabled. Not applicable when -XPartialTypesignatures is not enabled, in which case errors are generated for such holes. See . [dynamic]

-fwarn-deriving-typeable
  warn when encountering a request to derive an instance of class Typeable. As of GHC 7.10, such declarations are unnecessary and are ignored by the compiler because GHC has a custom solver for discharging this type of constraint. [dynamic]

OPTIMISATION LEVELS

-O0 Disable optimisations (default) [dynamic]

-O or -O1 Enable level 1 optimisations [dynamic]

-O2 Enable level 2 optimisations [dynamic]

-Odph Enable level 2 optimisations, set -fmax-simplifier-iterations=20 and -fsimplifier-phases=3. [dynamic]

INDIVIDUAL OPTIMISATIONS

-fcall-arity
  Enable call-arity optimisation. Implied by -O. [dynamic]

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

-fcmm-elim-common-blocks
  Enable Cmm common block elimination. Implied by -O. [dynamic]

-fcmm-sink
  Enable Cmm sinking. Implied by -O. [dynamic]

-fcpr-off Switch off CPR analysis in the demand analyser. [static]

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

-fdicts-cheap
  Make dictionary-valued expressions seem cheap to the optimiser. [dynamic]

-fdicts-strict
  Make dictionaries strict [dynamic]

-fdmd-tx-dict-sel
  Use a special demand transformer for dictionary selectors. Always enabled by default. [dynamic]

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

-fdo-lambda-eta-expansion
  Enable lambda eta-expansion. Always enabled by default. [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]

-fexpose-all-unfoldings
  Expose all unfoldings, even for very large or recursive functions. [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]

-ffun-to-thunk
  Allow worker-wrapper to convert a function closure into a thunk if the function does not use any of its arguments. Off by default. [dynamic]

-fignore-asserts
  Ignore assertions in the source. Implied by -O. [dynamic]

-fignore-interface-pragmas
  Ignore pragmas in interface files. Implied by -O0 only. [dynamic]

-flate-dmd-anal
  Run demand analysis again, at the end of the simplification pipeline [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: 2000) [dynamis]

-floopification
  Turn saturated self-recursive tail-calls into local jumps in the generated assembly. Implied by -O. [dynamic]

-fmax-inline-alloc-size=n
  Set the maximum size of inline array allocations to n bytes (default: 128). GHC will allocate non-pinned arrays of statically known size in the current nursery block if they’re no bigger than n bytes, ignoring GC overheap. This value should be quite a bit smaller than the block size (typically: 4096). [dynamic]

-fmax-inline-memcpy-insns=n
Inline memcpy calls if they would generate no more than n pseudo instructions (default: 32). [dynamic]

-fmax-inline-memset-insns=n
Inline memset calls if they would generate no more than n pseudo instructions (default: 32). [dynamic]

-fmax-relevant-binds=n
  Set the maximum number of bindings to display in type error messages (default 6). [dynamic]

-fmax-simplifier-iterations=n
  Set the max iterations for the simplifier (default 4). [dynamic]

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

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

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

-fomit-interface-pragmas
  Don’t generate interface pragmas. Implied by -O0 only. [dynamic]

-fomit-yields
  Omit heap checks when no allocation is being performed. [dynamic]

-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]

-fregs-graph
  Use the graph colouring register allocator for register allocation in the native code generator. Implied by -O2. [dynamic]

-fregs-iterative
  Use the iterative coalescing graph colouring register allocator in the native code generator. [dynamic]

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

-fspec-constr-threshold=n
  Set the size threshold for the SpecConstr transformation to n (default: 2000) [dynamic]

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

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

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

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

-funbox-small-strict-fields
  Flatten strict constructor fields with a pointer-sized representation. Implied by -O. [dynamic]

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

-funfolding-creation-threshold=n
  Tweak unfolding settings. Default: 750 [dynamic]

-funfolding-dict-discount=n
  Tweak unfolding settings. Default: 30 [dynamic]

-funfolding-fun-discount=n
  Tweak unfolding settings. Default: 60 [dynamic]

-funfolding-keeness-factor=n
  Tweak unfolding settings. Default: 1.5 [dynamic]

-funfolding-use-threshold=n
  Tweak unfolding settings. Default: 60 [dynamic]

-fvectorisation-avoidance
  Enable vectorisation avoidance. Always enabled by default. [dynamic]

-fvectorise
  Enable vectorisation of nested data parallelism [dynamic]

PROFILING OPTIONS

-prof Turn on profiling [dynamic]

-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 [dynamic]

PROGRAM COVERAGE OPTIONS

-fhpc Turn on Haskell program coverage instrumentation [dynamic]

-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]

-fwrite-interface
  Always write interface files [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]

-staticlib
  On Darwin/OS X/iOS only, generate a standalone static library (as opposed to an executable). This is the usual way to compile for iOS. [dynamic]

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

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

-dynamic-too
  Build dynamic object files as well as static object files during compilation [dynamic]

-dyno Set the output path for the dynamically linked objects [dynamic]

-dynosuf
  Set the output suffix for dynamic object files [dynamic]

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

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

-framework-path name
  On Darwin/OS X/iOS 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 [dynamic]

-threaded
  Use the threaded runtime [dynamic]

-debug Use the debugging runtime [dynamic]

-ticky For linking, this simply implies -debug; see . [dynamic]

-eventlog
  Enable runtime event tracing [dynamic]

-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/OS X only) [dynamic]

-rdynamic
  This instructs the linker to add all symbols, not only used ones, to the dynamic symbol table. Currently Linux and Windows/MinGW32 only. This is equivalent to using -optl -rdynamic on Linux, and -optl -export-all-symbols on Windows. [dynamic]

PLUGIN OPTIONS

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

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

-pgmlo cmd
  Use cmd as the LLVM optimiser [dynamic]

-pgmlc cmd
  Use cmd as the LLVM 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]

-pgmlibtool cmd
  Use cmd as the command for libtool (with -staticlib only). [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]

-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]

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-cse
  Dump CSE output [dynamic]

-ddump-deriv
  Dump deriving output [dynamic]

-ddump-ds Dump desugarer output [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-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-strsigs
  Dump strictness signatures [dynamic]

-ddump-tc Dump typechecker output [dynamic]

-dth-dec-file
  Show evaluated TH declarations in a .th.hs file [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-user-length
  Set the depth for printing expressions in error msgs [dynamic]

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

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

-dsuppress-all
  In core dumps, suppress everything (except for uniques) that is suppressible. [dynamic]

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

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

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

-dsuppress-type-signatures
  Suppress type signatures [dynamic]

-dsuppress-type-applications
  Suppress type applications [dynamic]

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

-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]

-frule-check
  Report sites with rules that could have fired but didn’t. Takes a string argument. [dynamic]

MISC COMPILER OPTIONS

-jN When compiling with --make, compile N modules in parallel. [dynamic]

-fno-hi-version-check
  Don’t complain about .hi file mismatches [dynamic]

-fhistory-size
  Set simplification history size [dynamic]

-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/local/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).

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Glasgow FP Suite GHC (1) 2002-10-25

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