ghc(1) - Linux man page

Name

GHC - the Glasgow Haskell Compiler

Synopsis

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

Description

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

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

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

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

Common suffixes of file names for Haskell are:

.hs
Haskell source code; preprocess, compile
.lhs
literate Haskell source; unlit, preprocess, compile
.hi
Interface file; contains information about exported symbols
.hc
intermediate C files
.x_o
way x object files; common ways are: p, u, s
.x_hi
way x interface files

Options

Help and verbosity options

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

Which phases to run

-E -C -S -c -x suffix

Alternative modes of operation

--interactive --make -e expr -M

Redirecting output

-hcsuf suffix -hidir dir -hisuf suffix -o filename -odir dir -ohi filename -osuf suffix -stubdir dir -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-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 -no-auto-link-packages

Language options

-fglasgow-exts -fno-glasgow-exts -XOverlappingInstances -XNoOverlappingInstances -XIncoherentInstances -XNoIncoherentInstances -XUndecidableInstances -XNoUndecidableInstances -fcontext-stack=Nn -XArrows -XNoArrows -XDisambiguateRecordFields -XNoDisambiguateRecordFields -XForeignFunctionInterface -XNoForeignFunctionInterface -XGenerics -XNoGenerics -XImplicitParams -XNoImplicitParams -firrefutable-tuples -fno-irrefutable-tuples -XNoImplicitPrelude -XImplicitPrelude -XRebindableSyntax -XNoRebindableSyntax -XNoMonomorphismRestriction -XMonomorphismRrestriction -XNoNPlusKPatterns -XNPlusKPatterns -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 -XDoRec -XNoDoRec -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-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-name-shadowing -fno-warn-name-shadowing -fwarn-orphans -fno-warn-orphans -fwarn-overlapping-patterns -fno-warn-overlapping-patterns -fwarn-tabs -fno-warn-tabs -fwarn-type-defaults -fno-warn-type-defaults -fwarn-monomorphism-restriction -fno-warn-monomorphism-restriction -fwarn-unused-binds -fno-warn-unused-binds -fwarn-unused-imports -fno-warn-unused-imports -fwarn-unused-matches -fno-warn-unused-matches -fwarn-unused-do-bind -fno-warn-unused-do-bind -fwarn-wrong-do-bind -fno-warn-wrong-do-bind

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 -fspecialise -ffull-laziness -ffloat-in -fenable-rewrite-rules -fno-enable-rewrite-rules -fstrictness -fstrictness=before=n -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 -fllvm -fno-code -fbyte-code -fobject-code

Linking options

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

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 -optlo option -optlc option -optm option -opta option -optl option -optdll option -optwindres option

Platform-specific options

-msse2 -monly-[432]-regs

External core file options

-fext-core

Compiler debugging options

-dcore-lint -ddump-asm -ddump-bcos -ddump-cmm -ddump-cpranal -ddump-cse -ddump-deriv -ddump-ds -ddump-flatC -ddump-foreign -ddump-hpc -ddump-inlinings -ddump-llvm -ddump-occur-anal -ddump-opt-cmm -ddump-parsed -ddump-prep -ddump-rn -ddump-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 -dsuppress-coercions -dsuppress-module-prefixes -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 -fno-ghci-sandbox

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-extensions or --supported-languages: display the supported languages and language extensions [mode]
--info
display information about the compiler [mode]
--version: display GHC version [mode]
--numeric-version: display GHC version (numeric only) [mode]
--print-libdir: display GHC library directory [mode]
-ferror-spans: output full span in error messages [static]
-Hsize Set the minimum heap size to size [static]
-Rghc-timing: Summarise timing stats for GHC (same as +RTS -tstderr) [static]

Which Phases To Run

-E Stop after preprocessing (.hspp file) [mode] -C Stop after generating C (.hc file) [mode] -S Stop after generating assembly (.s file) [mode] -c Do not link [dynamic]
-x suffix: Override default behaviour for source files [static]

Alternative Modes Of Operation

--interactive

Interactive mode - normally used by just running ghci; see for details. [mode]
--make
Build a multi-module Haskell program, automatically figuring out dependencies. Likely to be much easier, and faster, than using make; see for details.. [mode]
-e expr: Evaluate expr; see for details. [mode]
-M Generate dependency information suitable for use in a Makefile; see for details. [mode]

Redirecting Output

-hcsuf suffix

set the suffix to use for intermediate C files [dynamic]
-hidir dir: set directory for interface files [dynamic]
-hisuf suffix: set the suffix to use for interface files [dynamic]
-o filename: set output filename [dynamic]
-odir dir: set directory for object files [dynamic]
-ohi filename: set the filename in which to put the interface [dynamic]
-osuf suffix: set the output file suffix [dynamic]
-stubdir dir: redirect FFi stub files [dynamic]
-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-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]
-no-auto-link-packages: Don't automatically link in the haskell98 package. [dynamic]

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]
-XRebindableSyntax: Employ rebindable syntax [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]
-XDoRec: Enable recursive do notation. [dynamic]
-XRecursiveDo: Enable recursive do (mdo) notation. This is deprecated; please use recursive do notation instead. [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-lazy-unlifted-bindings: warn when a pattern binding looks lazy but must be strict [dynamic]
-fwarn-missing-fields: warn when fields of a record are uninitialised [dynamic]
-fwarn-missing-import-lists: warn when an import declaration does not explicitly list all the names brought into scope [dynamic]
-fwarn-missing-methods: warn when class methods are undefined [dynamic]
-fwarn-missing-signatures: warn about top-level functions without signatures [dynamic]
-fwarn-name-shadowing: warn when names are shadowed [dynamic]
-fwarn-orphans: warn when the module contains orphan instance declarations or rewrite rules [dynamic]
-fwarn-overlapping-patterns: warn about overlapping patterns [dynamic]
-fwarn-tabs: warn if there are tabs in the source file [dynamic]
-fwarn-type-defaults: warn when defaulting happens [dynamic]
-fwarn-monomorphism-restriction: warn when the Monomorphism Restriction is applied [dynamic]
-fwarn-unused-binds: warn about bindings that are unused [dynamic]
-fwarn-unused-imports: warn about unnecessary imports [dynamic]
-fwarn-unused-matches: warn about variables in patterns that aren't used [dynamic]
-fwarn-unused-do-bind: warn about do bindings that appear to throw away values of types other than () [dynamic]
-fwarn-wrong-do-bind: warn about do bindings that appear to throw away monadic values that you should have bound instead [dynamic]

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]
-fspecialise: Turn on specialisation of overloaded functions. Implied by -O. [dynamic]
-ffull-laziness: Turn on full laziness (floating bindings outwards). Implied by -O. [dynamic]
-ffloat-in: Turn on the float-in transformation. Implied by -O. [dynamic]
-fenable-rewrite-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]
-fstrictness=before=n: Run an additional strictness analysis before simplifier phase n [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 not marked INLINE [dynamic]
-auto-all: Auto-add _scc_s to all top-level functions not marked INLINE [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]
-fllvm
Compile via LLVM [dynamic]
-fno-code: Omit code generation [dynamic]
-fbyte-code: Generate byte-code [dynamic]
-fobject-code: Generate object code [dynamic]

Linking Options

-shared

Generate a shared library (as opposed to an executable) [dynamic]
-fPIC
Generate position-independent code (where available) [static]
-dynamic: Use dynamic Haskell libraries (if available) [static]
-dynload: Selects one of a number of modes for finding shared libraries at runtime. [static]
-framework name: On Darwin/MacOS X only, link in the framework name. This option corresponds to the -framework option for Apple's Linker. [dynamic]
-framework-path name: On Darwin/MacOS X only, add dir to the list of directories searched for frameworks. This option corresponds to the -F option for Apple's Linker. [dynamic]
-llib Link in library lib [dynamic] -Ldir Add dir to the list of directories searched for libraries [dynamic]
-main-is: Set main module and function [dynamic]
--mk-dll: DLL-creation mode (Windows only) [dynamic]
-no-hs-main: Don't assume this program contains main [dynamic]
-rtsopts, -rtsopts={none,some,all}: Control whether the RTS behaviour can be tweaked via command-line flags and the GHCRTS environment variable. Using none means no RTS flags can be given; some means only a minimum of safe options can be given (the default), and all (or no argument at all) means that all RTS flags are permitted. [dynamic]
-with-rtsopts=opts: Set the default RTS options to opts. [dynamic]
-no-link: Omit linking [dynamic]
-split-objs: Split objects (for libraries) [dynamic]
-static: Use static Haskell libraries [static]
-threaded: Use the threaded runtime [static]
-debug
Use the debugging runtime [static]
-eventlog: Enable runtime event tracing [static]
-fno-gen-manifest: Do not generate a manifest file (Windows only) [dynamic]
-fno-embed-manifest: Do not embed the manifest in the executable (Windows only) [dynamic]
-fno-shared-implib: Don't generate an import library for a DLL (Windows only) [dynamic]
-dylib-install-name path: Set the install name (via -install_name passed to Apple's linker), specifying the full install path of the library file. Any libraries or executables that link with it later will pick up that path as their runtime search location for it. (Darwin/MacOS X only) [dynamic]

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]
-optlo option: pass option to the LLVM optimiser [dynamic]
-optlc option: pass option to the LLVM compiler [dynamic]
-optm option: pass option to the mangler [dynamic]
-opta option: pass option to the assembler [dynamic]
-optl option: pass option to the linker [dynamic]
-optdll option: pass option to the DLL generator [dynamic]
-optwindres option: pass option to windres. [dynamic]

Platform-specific Options

-msse2
(x86 only) Use SSE2 for floating point [dynamic]
-monly-[432]-regs: (x86 only) give some registers back to the C compiler [dynamic]

External Core File Options

-fext-core

Generate .hcr external Core files [dynamic]

Compiler Debugging Options

-dcore-lint

Turn on internal sanity checking [dynamic]
-ddump-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-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-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]
-dsuppress-coercions: Suppress the printing of coercions in Core dumps to make them shorter. [static]
-dsuppress-module-prefixes: Suppress the printing of module qualification prefixes in Core dumps to make them easier to read. [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]
-fno-ghci-sandbox: Turn off the GHCi sandbox. Means computations are run in teh main thread, rather than a forked thread. [dynamic]

Files

/usr/lib64

Copyright

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).