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.TH "GHC" "1" "May 20, 2018" "8.4.3" "Glasgow Haskell Compiler"
.SH NAME
ghc \- the Glasgow Haskell Compiler
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.SH SYNOPSIS
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
ghc [option|filename]
ghci [option|filename]
.ft P
.fi
.UNINDENT
.UNINDENT
.SH DESCRIPTION
.sp
This manual page documents briefly the \fBghc\fP and \fBghci\fP commands. Note that
\fBghci\fP is not yet available on all architectures. Extensive documentation is
available in various other formats including PDF and HTML; see below.
.sp
Each of GHC\(aqs command line options is classified as either \fIstatic\fP or
\fIdynamic\fP\&. A static flag may only be specified on the command line, whereas a
dynamic flag may also be given in an \fBOPTIONS\fP pragma in a source file or
set from the GHCi command\-line with \fB:set\fP .
.sp
As a rule of thumb, all the language options are dynamic, as are the
warning options and the debugging options.
.sp
The rest are static, with the notable exceptions of
\fB\-v\fP, \fB\-cpp\fP, \fB\-fasm\fP, \fB\-fvia\-C\fP, \fB\-fllvm\fP, and
\fB\-#include\fP\&.
The OPTIONS sections lists the status of each flag.
.sp
Common suffixes of file names for Haskell are:
.INDENT 0.0
.TP
.B \fB\&.hs\fP
Haskell source code; preprocess, compile
.TP
.B \fB\&.lhs\fP
literate Haskell source; unlit, preprocess, compile
.TP
.B \fB\&.hi\fP
Interface file; contains information about exported symbols
.TP
.B \fB\&.hc\fP
intermediate C files
.TP
.B \fB\&.⟨way⟩_o\fP
object files for "way" ⟨way⟩; common ways are:
.INDENT 7.0
.TP
.B \fBdyn\fP
dynamically\-linked
.TP
.B \fBp\fP
built with profiling
.UNINDENT
.TP
.B \fB\&.⟨way⟩_hi\fP
interface files for "way" ⟨way⟩; common ways are:
.UNINDENT
.SH OPTIONS
.TP
.B Code generation
\fB\-dynamic\-too\fP \fB\-fasm\fP \fB\-fbyte\-code\fP \fB\-fllvm\fP \fB\-fno\-code\fP \fB\-fobject\-code\fP \fB\-fPIC\fP \fB\-fPIE\fP \fB\-fwrite\-interface\fP
.TP
.B Debugging the compiler
\fB\-dcmm\-lint\fP \fB\-dcore\-lint\fP \fB\-ddump\-asm\fP \fB\-ddump\-asm\-expanded\fP \fB\-ddump\-asm\-liveness\fP \fB\-ddump\-asm\-native\fP \fB\-ddump\-asm\-regalloc\fP \fB\-ddump\-asm\-regalloc\-stages\fP \fB\-ddump\-asm\-stats\fP \fB\-ddump\-bcos\fP \fB\-ddump\-cmm\fP \fB\-ddump\-cmm\-caf\fP \fB\-ddump\-cmm\-cbe\fP \fB\-ddump\-cmm\-cfg\fP \fB\-ddump\-cmm\-cps\fP \fB\-ddump\-cmm\-from\-stg\fP \fB\-ddump\-cmm\-info\fP \fB\-ddump\-cmm\-proc\fP \fB\-ddump\-cmm\-procmap\fP \fB\-ddump\-cmm\-raw\fP \fB\-ddump\-cmm\-sink\fP \fB\-ddump\-cmm\-sp\fP \fB\-ddump\-cmm\-split\fP \fB\-ddump\-cmm\-switch\fP \fB\-ddump\-cmm\-verbose\fP \fB\-ddump\-core\-stats\fP \fB\-ddump\-cse\fP \fB\-ddump\-deriv\fP \fB\-ddump\-ds\fP \fB\-ddump\-ec\-trace\fP \fB\-ddump\-foreign\fP \fB\-ddump\-if\-trace\fP \fB\-ddump\-inlinings\fP \fB\-ddump\-json\fP \fB\-ddump\-llvm\fP \fB\-ddump\-occur\-anal\fP \fB\-ddump\-opt\-cmm\fP \fB\-ddump\-parsed\fP \fB\-ddump\-parsed\-ast\fP \fB\-ddump\-prep\fP \fB\-ddump\-rn\fP \fB\-ddump\-rn\-ast\fP \fB\-ddump\-rn\-stats\fP \fB\-ddump\-rn\-trace\fP \fB\-ddump\-rule\-firings\fP \fB\-ddump\-rule\-rewrites\fP \fB\-ddump\-rules\fP \fB\-ddump\-simpl\fP \fB\-ddump\-simpl\-iterations\fP \fB\-ddump\-simpl\-stats\fP \fB\-ddump\-spec\fP \fB\-ddump\-splices\fP \fB\-ddump\-stg\fP \fB\-ddump\-str\-signatures\fP \fB\-ddump\-stranal\fP \fB\-ddump\-tc\fP \fB\-ddump\-tc\-ast\fP \fB\-ddump\-tc\-trace\fP \fB\-ddump\-timings\fP \fB\-ddump\-to\-file\fP \fB\-ddump\-types\fP \fB\-ddump\-vect\fP \fB\-ddump\-vt\-trace\fP \fB\-ddump\-worker\-wrapper\fP \fB\-dfaststring\-stats\fP \fB\-dinitial\-unique=⟨s⟩\fP \fB\-dno\-debug\-output\fP \fB\-dppr\-case\-as\-let\fP \fB\-dppr\-cols=⟨n⟩\fP \fB\-dppr\-debug\fP \fB\-dppr\-user\-length\fP \fB\-dshow\-passes\fP \fB\-dstg\-lint\fP \fB\-dsuppress\-all\fP \fB\-dsuppress\-coercions\fP \fB\-dsuppress\-idinfo\fP \fB\-dsuppress\-module\-prefixes\fP \fB\-dsuppress\-stg\-free\-vars\fP \fB\-dsuppress\-ticks\fP \fB\-dsuppress\-type\-applications\fP \fB\-dsuppress\-type\-signatures\fP \fB\-dsuppress\-unfoldings\fP \fB\-dsuppress\-uniques\fP \fB\-dsuppress\-var\-kinds\fP \fB\-dth\-dec\-file=⟨file⟩\fP \fB\-dunique\-increment=⟨i⟩\fP \fB\-dverbose\-core2core\fP \fB\-dverbose\-stg2stg\fP \fB\-falignment\-sanitisation\fP \fB\-fcatch\-bottoms\fP \fB\-fllvm\-fill\-undef\-with\-garbage\fP \fB\-g\fP \fB\-g⟨n⟩\fP
.TP
.B C pre\-processor
\fB\-cpp\fP \fB\-D⟨symbol⟩[=⟨value⟩]\fP \fB\-I⟨dir⟩\fP \fB\-U⟨symbol⟩\fP
.TP
.B Finding imports
\fB\-i\fP \fB\-i⟨dir⟩[:⟨dir⟩]*\fP
.TP
.B Interactive mode
\fB\-fbreak\-on\-error\fP \fB\-fbreak\-on\-exception\fP \fB\-fghci\-hist\-size=⟨n⟩\fP \fB\-flocal\-ghci\-history\fP \fB\-fprint\-bind\-result\fP \fB\-fshow\-loaded\-modules\fP \fB\-ghci\-script\fP \fB\-ignore\-dot\-ghci\fP \fB\-interactive\-print ⟨expr⟩\fP
.TP
.B Interface files
\fB\-\-show\-iface ⟨file⟩\fP \fB\-ddump\-hi\fP \fB\-ddump\-hi\-diffs\fP \fB\-ddump\-minimal\-imports\fP
.TP
.B Keeping intermediate files
\fB\-keep\-hc\-file\fP \fB\-keep\-hc\-files\fP \fB\-keep\-hi\-files\fP \fB\-keep\-llvm\-file\fP \fB\-keep\-llvm\-files\fP \fB\-keep\-o\-files\fP \fB\-keep\-s\-file\fP \fB\-keep\-s\-files\fP \fB\-keep\-tmp\-files\fP
.TP
.B Language options
\fB\-XAllowAmbiguousTypes\fP \fB\-XApplicativeDo\fP \fB\-XArrows\fP \fB\-XBangPatterns\fP \fB\-XBinaryLiterals\fP \fB\-XCApiFFI\fP \fB\-XConstrainedClassMethods\fP \fB\-XConstraintKinds\fP \fB\-XCPP\fP \fB\-XDataKinds\fP \fB\-XDatatypeContexts\fP \fB\-XDefaultSignatures\fP \fB\-XDeriveAnyClass\fP \fB\-XDeriveDataTypeable\fP \fB\-XDeriveFoldable\fP \fB\-XDeriveFunctor\fP \fB\-XDeriveGeneric\fP \fB\-XDeriveLift\fP \fB\-XDeriveTraversable\fP \fB\-XDerivingStrategies\fP \fB\-XDisambiguateRecordFields\fP \fB\-XDuplicateRecordFields\fP \fB\-XEmptyCase\fP \fB\-XEmptyDataDecls\fP \fB\-XEmptyDataDeriving\fP \fB\-XExistentialQuantification\fP \fB\-XExplicitForAll\fP \fB\-XExplicitNamespaces\fP \fB\-XExtendedDefaultRules\fP \fB\-XFlexibleContexts\fP \fB\-XFlexibleInstances\fP \fB\-XForeignFunctionInterface\fP \fB\-XFunctionalDependencies\fP \fB\-XGADTs\fP \fB\-XGADTSyntax\fP \fB\-XGeneralisedNewtypeDeriving\fP \fB\-XGeneralizedNewtypeDeriving\fP \fB\-XHexFloatLiterals\fP \fB\-XImplicitParams\fP \fB\-XImpredicativeTypes\fP \fB\-XIncoherentInstances\fP \fB\-XInstanceSigs\fP \fB\-XInterruptibleFFI\fP \fB\-XKindSignatures\fP \fB\-XLambdaCase\fP \fB\-XLiberalTypeSynonyms\fP \fB\-XMagicHash\fP \fB\-XMonadComprehensions\fP \fB\-XMonadFailDesugaring\fP \fB\-XMonoLocalBinds\fP \fB\-XMultiParamTypeClasses\fP \fB\-XMultiWayIf\fP \fB\-XNamedFieldPuns\fP \fB\-XNamedWildCards\fP \fB\-XNegativeLiterals\fP \fB\-XNoImplicitPrelude\fP \fB\-XNoMonomorphismRestriction\fP \fB\-XNoPatternGuards\fP \fB\-XNoTraditionalRecordSyntax\fP \fB\-XNPlusKPatterns\fP \fB\-XNullaryTypeClasses\fP \fB\-XNumDecimals\fP \fB\-XOverlappingInstances\fP \fB\-XOverloadedLabels\fP \fB\-XOverloadedLists\fP \fB\-XOverloadedStrings\fP \fB\-XPackageImports\fP \fB\-XParallelListComp\fP \fB\-XPartialTypeSignatures\fP \fB\-XPatternSynonyms\fP \fB\-XPolyKinds\fP \fB\-XPostfixOperators\fP \fB\-XQuasiQuotes\fP \fB\-XRank2Types\fP \fB\-XRankNTypes\fP \fB\-XRebindableSyntax\fP \fB\-XRecordWildCards\fP \fB\-XRecursiveDo\fP \fB\-XRoleAnnotations\fP \fB\-XSafe\fP \fB\-XScopedTypeVariables\fP \fB\-XStandaloneDeriving\fP \fB\-XStaticPointers\fP \fB\-XStrict\fP \fB\-XStrictData\fP \fB\-XTemplateHaskell\fP \fB\-XTemplateHaskellQuotes\fP \fB\-XTransformListComp\fP \fB\-XTrustworthy\fP \fB\-XTupleSections\fP \fB\-XTypeApplications\fP \fB\-XTypeFamilies\fP \fB\-XTypeFamilyDependencies\fP \fB\-XTypeInType\fP \fB\-XTypeOperators\fP \fB\-XTypeSynonymInstances\fP \fB\-XUnboxedSums\fP \fB\-XUnboxedTuples\fP \fB\-XUndecidableInstances\fP \fB\-XUndecidableSuperClasses\fP \fB\-XUnicodeSyntax\fP \fB\-XUnsafe\fP \fB\-XViewPatterns\fP
.TP
.B Linking options
\fB\-c\fP \fB\-debug\fP \fB\-dylib\-install\-name ⟨path⟩\fP \fB\-dynamic\fP \fB\-dynload\fP \fB\-eventlog\fP \fB\-fno\-embed\-manifest\fP \fB\-fno\-gen\-manifest\fP \fB\-fno\-shared\-implib\fP \fB\-framework ⟨name⟩\fP \fB\-framework\-path ⟨dir⟩\fP \fB\-fwhole\-archive\-hs\-libs\fP \fB\-L ⟨dir⟩\fP \fB\-l ⟨lib⟩\fP \fB\-main\-is ⟨thing⟩\fP \fB\-no\-hs\-main\fP \fB\-no\-rtsopts\-suggestions\fP \fB\-package ⟨name⟩\fP \fB\-pie\fP \fB\-rdynamic\fP \fB\-rtsopts[=⟨none|some|all⟩]\fP \fB\-shared\fP \fB\-split\-objs\fP \fB\-split\-sections\fP \fB\-static\fP \fB\-staticlib\fP \fB\-threaded\fP \fB\-with\-rtsopts=⟨opts⟩\fP
.TP
.B Miscellaneous options
\fB\-fexternal\-interpreter\fP \fB\-fglasgow\-exts\fP \fB\-ghcversion\-file ⟨path to ghcversion.h⟩\fP \fB\-H ⟨size⟩\fP \fB\-j[⟨n⟩]\fP
.TP
.B Modes of operation
\fB\-\-frontend ⟨module⟩\fP \fB\-\-help\fP \fB\-?\fP \fB\-\-info\fP \fB\-\-interactive\fP \fB\-\-make\fP \fB\-\-mk\-dll\fP \fB\-\-numeric\-version\fP \fB\-\-print\-libdir\fP \fB\-\-show\-iface ⟨file⟩\fP \fB\-\-show\-options\fP \fB\-\-supported\-extensions\fP \fB\-\-supported\-languages\fP \fB\-\-version\fP \fB\-V\fP \fB\-e ⟨expr⟩\fP \fB\-M\fP
.TP
.B Individual optimizations
\fB\-fcall\-arity\fP \fB\-fcase\-folding\fP \fB\-fcase\-merge\fP \fB\-fcmm\-elim\-common\-blocks\fP \fB\-fcmm\-sink\fP \fB\-fcpr\-anal\fP \fB\-fcross\-module\-specialise\fP \fB\-fcse\fP \fB\-fdicts\-cheap\fP \fB\-fdicts\-strict\fP \fB\-fdmd\-tx\-dict\-sel\fP \fB\-fdo\-eta\-reduction\fP \fB\-fdo\-lambda\-eta\-expansion\fP \fB\-feager\-blackholing\fP \fB\-fenable\-rewrite\-rules\fP \fB\-fexcess\-precision\fP \fB\-fexitification\fP \fB\-fexpose\-all\-unfoldings\fP \fB\-ffloat\-in\fP \fB\-ffull\-laziness\fP \fB\-ffun\-to\-thunk\fP \fB\-fignore\-asserts\fP \fB\-fignore\-interface\-pragmas\fP \fB\-flate\-dmd\-anal\fP \fB\-fliberate\-case\fP \fB\-fliberate\-case\-threshold=⟨n⟩\fP \fB\-fllvm\-pass\-vectors\-in\-regs\fP \fB\-floopification\fP \fB\-fmax\-inline\-alloc\-size=⟨n⟩\fP \fB\-fmax\-inline\-memcpy\-insns=⟨n⟩\fP \fB\-fmax\-inline\-memset\-insns=⟨n⟩\fP \fB\-fmax\-relevant\-binds=⟨n⟩\fP \fB\-fmax\-simplifier\-iterations=⟨n⟩\fP \fB\-fmax\-uncovered\-patterns=⟨n⟩\fP \fB\-fmax\-valid\-substitutions=⟨n⟩\fP \fB\-fmax\-worker\-args=⟨n⟩\fP \fB\-fno\-opt\-coercion\fP \fB\-fno\-pre\-inlining\fP \fB\-fno\-state\-hack\fP \fB\-fomit\-interface\-pragmas\fP \fB\-fomit\-yields\fP \fB\-foptimal\-applicative\-do\fP \fB\-fpedantic\-bottoms\fP \fB\-fregs\-graph\fP \fB\-fregs\-iterative\fP \fB\-fsimpl\-tick\-factor=⟨n⟩\fP \fB\-fsimplifier\-phases=⟨n⟩\fP \fB\-fsolve\-constant\-dicts\fP \fB\-fspec\-constr\fP \fB\-fspec\-constr\-count=⟨n⟩\fP \fB\-fspec\-constr\-keen\fP \fB\-fspec\-constr\-threshold=⟨n⟩\fP \fB\-fspecialise\fP \fB\-fspecialise\-aggressively\fP \fB\-fstatic\-argument\-transformation\fP \fB\-fstg\-cse\fP \fB\-fstrictness\fP \fB\-fstrictness\-before=⟨n⟩\fP \fB\-funbox\-small\-strict\-fields\fP \fB\-funbox\-strict\-fields\fP \fB\-funfolding\-creation\-threshold=⟨n⟩\fP \fB\-funfolding\-dict\-discount=⟨n⟩\fP \fB\-funfolding\-fun\-discount=⟨n⟩\fP \fB\-funfolding\-keeness\-factor=⟨n⟩\fP \fB\-funfolding\-use\-threshold=⟨n⟩\fP \fB\-fvectorisation\-avoidance\fP \fB\-fvectorise\fP
.TP
.B Optimization levels
\fB\-O\fP \fB\-O1\fP \fB\-O0\fP \fB\-O2\fP \fB\-Odph\fP
.TP
.B Package options
\fB\-clear\-package\-db\fP \fB\-distrust ⟨pkg⟩\fP \fB\-distrust\-all\-packages\fP \fB\-fpackage\-trust\fP \fB\-global\-package\-db\fP \fB\-hide\-all\-packages\fP \fB\-hide\-package ⟨pkg⟩\fP \fB\-ignore\-package ⟨pkg⟩\fP \fB\-no\-auto\-link\-packages\fP \fB\-no\-global\-package\-db\fP \fB\-no\-user\-package\-db\fP \fB\-package ⟨pkg⟩\fP \fB\-package\-db ⟨file⟩\fP \fB\-package\-env ⟨file⟩|⟨name⟩\fP \fB\-package\-id ⟨unit\-id⟩\fP \fB\-this\-unit\-id ⟨unit\-id⟩\fP \fB\-trust ⟨pkg⟩\fP \fB\-user\-package\-db\fP
.TP
.B Phases of compilation
\fB\-C\fP \fB\-c\fP \fB\-E\fP \fB\-F\fP \fB\-S\fP \fB\-x ⟨suffix⟩\fP
.TP
.B Overriding external programs
\fB\-pgma ⟨cmd⟩\fP \fB\-pgmc ⟨cmd⟩\fP \fB\-pgmdll ⟨cmd⟩\fP \fB\-pgmF ⟨cmd⟩\fP \fB\-pgmi ⟨cmd⟩\fP \fB\-pgmL ⟨cmd⟩\fP \fB\-pgml ⟨cmd⟩\fP \fB\-pgmlc ⟨cmd⟩\fP \fB\-pgmlibtool ⟨cmd⟩\fP \fB\-pgmlo ⟨cmd⟩\fP \fB\-pgmP ⟨cmd⟩\fP \fB\-pgms ⟨cmd⟩\fP \fB\-pgmwindres ⟨cmd⟩\fP
.TP
.B Phase\-specific options
\fB\-opta ⟨option⟩\fP \fB\-optc ⟨option⟩\fP \fB\-optdll ⟨option⟩\fP \fB\-optF ⟨option⟩\fP \fB\-opti ⟨option⟩\fP \fB\-optL ⟨option⟩\fP \fB\-optl ⟨option⟩\fP \fB\-optlc ⟨option⟩\fP \fB\-optlo ⟨option⟩\fP \fB\-optP ⟨option⟩\fP \fB\-optwindres ⟨option⟩\fP
.TP
.B Platform\-specific options
\fB\-msse2\fP \fB\-msse4.2\fP
.TP
.B Compiler plugins
\fB\-fplugin\-opt=⟨module⟩:⟨args⟩\fP \fB\-fplugin=⟨module⟩\fP \fB\-hide\-all\-plugin\-packages\fP \fB\-plugin\-package ⟨pkg⟩\fP \fB\-plugin\-package\-id ⟨pkg\-id⟩\fP
.TP
.B Profiling
\fB\-fno\-prof\-auto\fP \fB\-fno\-prof\-cafs\fP \fB\-fno\-prof\-count\-entries\fP \fB\-fprof\-auto\fP \fB\-fprof\-auto\-calls\fP \fB\-fprof\-auto\-exported\fP \fB\-fprof\-auto\-top\fP \fB\-fprof\-cafs\fP \fB\-prof\fP \fB\-ticky\fP
.TP
.B Program coverage
\fB\-fhpc\fP
.TP
.B Recompilation checking
\fB\-fforce\-recomp\fP \fB\-fignore\-hpc\-changes\fP \fB\-fignore\-optim\-changes\fP
.TP
.B Redirecting output
\fB\-\-exclude\-module=⟨file⟩\fP \fB\-ddump\-mod\-cycles\fP \fB\-dep\-makefile ⟨file⟩\fP \fB\-dep\-suffix ⟨suffix⟩\fP \fB\-dumpdir ⟨dir⟩\fP \fB\-hcsuf ⟨suffix⟩\fP \fB\-hidir ⟨dir⟩\fP \fB\-hisuf ⟨suffix⟩\fP \fB\-include\-pkg\-deps\fP \fB\-o ⟨file⟩\fP \fB\-odir ⟨dir⟩\fP \fB\-ohi ⟨file⟩\fP \fB\-osuf ⟨suffix⟩\fP \fB\-outputdir ⟨dir⟩\fP \fB\-stubdir ⟨dir⟩\fP
.TP
.B Temporary files
\fB\-tmpdir ⟨dir⟩\fP
.TP
.B Verbosity options
\fB\-fdiagnostics\-color=⟨always|auto|never⟩\fP \fB\-fdiagnostics\-show\-caret\fP \fB\-ferror\-spans\fP \fB\-fhide\-source\-paths\fP \fB\-fprint\-equality\-relations\fP \fB\-fprint\-expanded\-synonyms\fP \fB\-fprint\-explicit\-coercions\fP \fB\-fprint\-explicit\-foralls\fP \fB\-fprint\-explicit\-kinds\fP \fB\-fprint\-explicit\-runtime\-rep\fP \fB\-fprint\-explicit\-runtime\-reps\fP \fB\-fprint\-potential\-instances\fP \fB\-fprint\-typechecker\-elaboration\fP \fB\-fprint\-unicode\-syntax\fP \fB\-fshow\-hole\-constraints\fP \fB\-Rghc\-timing\fP \fB\-v\fP \fB\-v⟨n⟩\fP
.TP
.B Warnings
\fB\-fdefer\-out\-of\-scope\-variables\fP \fB\-fdefer\-type\-errors\fP \fB\-fdefer\-typed\-holes\fP \fB\-fhelpful\-errors\fP \fB\-fmax\-pmcheck\-iterations=⟨n⟩\fP \fB\-fshow\-warning\-groups\fP \fB\-W\fP \fB\-w\fP \fB\-Wall\fP \fB\-Wall\-missed\-specialisations\fP \fB\-Wamp\fP \fB\-Wcompat\fP \fB\-Wcpp\-undef\fP \fB\-Wdeferred\-out\-of\-scope\-variables\fP \fB\-Wdeferred\-type\-errors\fP \fB\-Wdeprecated\-flags\fP \fB\-Wdeprecations\fP \fB\-Wdodgy\-exports\fP \fB\-Wdodgy\-foreign\-imports\fP \fB\-Wdodgy\-imports\fP \fB\-Wduplicate\-constraints\fP \fB\-Wduplicate\-exports\fP \fB\-Wempty\-enumerations\fP \fB\-Werror\fP \fB\-Weverything\fP \fB\-Whi\-shadowing\fP \fB\-Widentities\fP \fB\-Wimplicit\-prelude\fP \fB\-Wincomplete\-patterns\fP \fB\-Wincomplete\-record\-updates\fP \fB\-Wincomplete\-uni\-patterns\fP \fB\-Winline\-rule\-shadowing\fP \fB\-Wmissed\-specialisations\fP \fB\-Wmissing\-export\-lists\fP \fB\-Wmissing\-exported\-signatures\fP \fB\-Wmissing\-exported\-sigs\fP \fB\-Wmissing\-fields\fP \fB\-Wmissing\-home\-modules\fP \fB\-Wmissing\-import\-lists\fP \fB\-Wmissing\-local\-signatures\fP \fB\-Wmissing\-local\-sigs\fP \fB\-Wmissing\-methods\fP \fB\-Wmissing\-monadfail\-instances\fP \fB\-Wmissing\-pattern\-synonym\-signatures\fP \fB\-Wmissing\-signatures\fP \fB\-Wmonomorphism\-restriction\fP \fB\-Wname\-shadowing\fP \fB\-Wno\-compat\fP \fB\-Wnoncanonical\-monad\-instances\fP \fB\-Wnoncanonical\-monadfail\-instances\fP \fB\-Wnoncanonical\-monoid\-instances\fP \fB\-Worphans\fP \fB\-Woverflowed\-literals\fP \fB\-Woverlapping\-patterns\fP \fB\-Wpartial\-fields\fP \fB\-Wpartial\-type\-signatures\fP \fB\-Wredundant\-constraints\fP \fB\-Wsafe\fP \fB\-Wsemigroup\fP \fB\-Wsimplifiable\-class\-constraints\fP \fB\-Wtabs\fP \fB\-Wtrustworthy\-safe\fP \fB\-Wtype\-defaults\fP \fB\-Wtyped\-holes\fP \fB\-Wunbanged\-strict\-patterns\fP \fB\-Wunrecognised\-pragmas\fP \fB\-Wunrecognised\-warning\-flags\fP \fB\-Wunsafe\fP \fB\-Wunsupported\-calling\-conventions\fP \fB\-Wunsupported\-llvm\-version\fP \fB\-Wunticked\-promoted\-constructors\fP \fB\-Wunused\-binds\fP \fB\-Wunused\-do\-bind\fP \fB\-Wunused\-foralls\fP \fB\-Wunused\-imports\fP \fB\-Wunused\-local\-binds\fP \fB\-Wunused\-matches\fP \fB\-Wunused\-pattern\-binds\fP \fB\-Wunused\-top\-binds\fP \fB\-Wunused\-type\-patterns\fP \fB\-Wwarn\fP \fB\-Wwarnings\-deprecations\fP \fB\-Wwrong\-do\-bind\fP
.SS Code generation
.INDENT 0.0
.TP
.B \fI\%\-dynamic\-too\fP
Build dynamic object files \fIas well as\fP static object files
during compilation
.TP
.B \fI\%\-fasm\fP
Use the \fInative code generator\fP
.TP
.B \fI\%\-fbyte\-code\fP
Generate byte\-code
.TP
.B \fI\%\-fllvm\fP
Compile using the \fILLVM code generator\fP
.TP
.B \fI\%\-fno\-code\fP
Omit code generation
.TP
.B \fI\%\-fobject\-code\fP
Generate object code
.TP
.B \fI\%\-fPIC\fP
Generate position\-independent code (where available)
.TP
.B \fI\%\-fPIE\fP
Generate code for a position\-independent executable (where available)
.TP
.B \fI\%\-fwrite\-interface\fP
Always write interface files
.UNINDENT
.SS Debugging the compiler
.INDENT 0.0
.TP
.B \fI\%\-dcmm\-lint\fP
C\-\- pass sanity checking
.TP
.B \fI\%\-dcore\-lint\fP
Turn on internal sanity checking
.TP
.B \fI\%\-ddump\-asm\fP
Dump final assembly
.TP
.B \fI\%\-ddump\-asm\-expanded\fP
Dump the result of the synthetic instruction expansion pass.
.TP
.B \fI\%\-ddump\-asm\-liveness\fP
Dump assembly augmented with register liveness
.TP
.B \fI\%\-ddump\-asm\-native\fP
Dump initial assembly
.TP
.B \fI\%\-ddump\-asm\-regalloc\fP
Dump the result of register allocation
.TP
.B \fI\%\-ddump\-asm\-regalloc\-stages\fP
Dump the build/spill stages of the \fB\-fregs\-graph\fP
register allocator.
.TP
.B \fI\%\-ddump\-asm\-stats\fP
Dump statistics from the register allocator.
.TP
.B \fI\%\-ddump\-bcos\fP
Dump interpreter byte code
.TP
.B \fI\%\-ddump\-cmm\fP
Dump the final C\-\- output
.TP
.B \fI\%\-ddump\-cmm\-caf\fP
Dump the results of the C\-\- CAF analysis pass.
.TP
.B \fI\%\-ddump\-cmm\-cbe\fP
Dump the results of common block elimination
.TP
.B \fI\%\-ddump\-cmm\-cfg\fP
Dump the results of the C\-\- control flow optimisation pass.
.TP
.B \fI\%\-ddump\-cmm\-cps\fP
Dump the results of the CPS pass
.TP
.B \fI\%\-ddump\-cmm\-from\-stg\fP
Dump STG\-to\-C\-\- output
.TP
.B \fI\%\-ddump\-cmm\-info\fP
Dump the results of the C\-\- info table augmentation pass.
.TP
.B \fI\%\-ddump\-cmm\-proc\fP
Dump the results of proc\-point analysis
.TP
.B \fI\%\-ddump\-cmm\-procmap\fP
Dump the results of the C\-\- proc\-point map pass.
.TP
.B \fI\%\-ddump\-cmm\-raw\fP
Dump raw C\-\-
.TP
.B \fI\%\-ddump\-cmm\-sink\fP
Dump the results of the C\-\- sinking pass.
.TP
.B \fI\%\-ddump\-cmm\-sp\fP
Dump the results of the C\-\- stack layout pass.
.TP
.B \fI\%\-ddump\-cmm\-split\fP
Dump the results of the C\-\- proc\-point splitting pass.
.TP
.B \fI\%\-ddump\-cmm\-switch\fP
Dump the results of switch lowering passes
.TP
.B \fI\%\-ddump\-cmm\-verbose\fP
Show output from each C\-\- pipeline pass
.TP
.B \fI\%\-ddump\-core\-stats\fP
Print a one\-line summary of the size of the Core program at the
end of the optimisation pipeline
.TP
.B \fI\%\-ddump\-cse\fP
Dump CSE output
.TP
.B \fI\%\-ddump\-deriv\fP
Dump deriving output
.TP
.B \fI\%\-ddump\-ds\fP
Dump desugarer output
.TP
.B \fI\%\-ddump\-ec\-trace\fP
Trace exhaustiveness checker
.TP
.B \fI\%\-ddump\-foreign\fP
Dump \fBforeign export\fP stubs
.TP
.B \fI\%\-ddump\-if\-trace\fP
Trace interface files
.TP
.B \fI\%\-ddump\-inlinings\fP
Dump inlining info
.TP
.B \fI\%\-ddump\-json\fP
Dump error messages as JSON documents
.TP
.B \fI\%\-ddump\-llvm\fP
Dump LLVM intermediate code.
.TP
.B \fI\%\-ddump\-occur\-anal\fP
Dump occurrence analysis output
.TP
.B \fI\%\-ddump\-opt\-cmm\fP
Dump the results of C\-\- to C\-\- optimising passes
.TP
.B \fI\%\-ddump\-parsed\fP
Dump parse tree
.TP
.B \fI\%\-ddump\-parsed\-ast\fP
Dump parser output as a syntax tree
.TP
.B \fI\%\-ddump\-prep\fP
Dump prepared core
.TP
.B \fI\%\-ddump\-rn\fP
Dump renamer output
.TP
.B \fI\%\-ddump\-rn\-ast\fP
Dump renamer output as a syntax tree
.TP
.B \fI\%\-ddump\-rn\-stats\fP
Renamer stats
.TP
.B \fI\%\-ddump\-rn\-trace\fP
Trace renamer
.TP
.B \fI\%\-ddump\-rule\-firings\fP
Dump rule firing info
.TP
.B \fI\%\-ddump\-rule\-rewrites\fP
Dump detailed rule firing info
.TP
.B \fI\%\-ddump\-rules\fP
Dump rewrite rules
.TP
.B \fI\%\-ddump\-simpl\fP
Dump final simplifier output
.TP
.B \fI\%\-ddump\-simpl\-iterations\fP
Dump output from each simplifier iteration
.TP
.B \fI\%\-ddump\-simpl\-stats\fP
Dump simplifier stats
.TP
.B \fI\%\-ddump\-spec\fP
Dump specialiser output
.TP
.B \fI\%\-ddump\-splices\fP
Dump TH spliced expressions, and what they evaluate to
.TP
.B \fI\%\-ddump\-stg\fP
Dump final STG
.TP
.B \fI\%\-ddump\-str\-signatures\fP
Dump strictness signatures
.TP
.B \fI\%\-ddump\-stranal\fP
Dump strictness analyser output
.TP
.B \fI\%\-ddump\-tc\fP
Dump typechecker output
.TP
.B \fI\%\-ddump\-tc\-ast\fP
Dump typechecker output as a syntax tree
.TP
.B \fI\%\-ddump\-tc\-trace\fP
Trace typechecker
.TP
.B \fI\%\-ddump\-timings\fP
Dump per\-pass timing and allocation statistics
.TP
.B \fI\%\-ddump\-to\-file\fP
Dump to files instead of stdout
.TP
.B \fI\%\-ddump\-types\fP
Dump type signatures
.TP
.B \fI\%\-ddump\-vect\fP
Dump vectoriser input and output
.TP
.B \fI\%\-ddump\-vt\-trace\fP
Trace vectoriser
.TP
.B \fI\%\-ddump\-worker\-wrapper\fP
Dump worker\-wrapper output
.TP
.B \fI\%\-dfaststring\-stats\fP
Show statistics for fast string usage when finished
.TP
.B \fI\%\-dinitial\-unique=⟨s⟩\fP
Start \fBUniqSupply\fP allocation from ⟨s⟩.
.TP
.B \fI\%\-dno\-debug\-output\fP
Suppress unsolicited debugging output
.TP
.B \fI\%\-dppr\-case\-as\-let\fP
Print single alternative case expressions as strict lets.
.TP
.B \fI\%\-dppr\-cols=⟨n⟩\fP
Set the width of debugging output. For example \fB\-dppr\-cols200\fP
.TP
.B \fI\%\-dppr\-debug\fP
Turn on debug printing (more verbose)
.TP
.B \fI\%\-dppr\-user\-length\fP
Set the depth for printing expressions in error msgs
.TP
.B \fI\%\-dshow\-passes\fP
Print out each pass name as it happens
.TP
.B \fI\%\-dstg\-lint\fP
STG pass sanity checking
.TP
.B \fI\%\-dsuppress\-all\fP
In core dumps, suppress everything (except for uniques) that is
suppressible.
.TP
.B \fI\%\-dsuppress\-coercions\fP
Suppress the printing of coercions in Core dumps to make them
shorter
.TP
.B \fI\%\-dsuppress\-idinfo\fP
Suppress extended information about identifiers where they
are bound
.TP
.B \fI\%\-dsuppress\-module\-prefixes\fP
Suppress the printing of module qualification prefixes
.TP
.B \fI\%\-dsuppress\-stg\-free\-vars\fP
Suppress the printing of closure free variable lists in STG output
.TP
.B \fI\%\-dsuppress\-ticks\fP
Suppress "ticks" in the pretty\-printer output.
.TP
.B \fI\%\-dsuppress\-type\-applications\fP
Suppress type applications
.TP
.B \fI\%\-dsuppress\-type\-signatures\fP
Suppress type signatures
.TP
.B \fI\%\-dsuppress\-unfoldings\fP
Suppress the printing of the stable unfolding of a variable at
its binding site
.TP
.B \fI\%\-dsuppress\-uniques\fP
Suppress the printing of uniques in debug output (easier to use
\fBdiff\fP)
.TP
.B \fI\%\-dsuppress\-var\-kinds\fP
Suppress the printing of variable kinds
.TP
.B \fI\%\-dth\-dec\-file=⟨file⟩\fP
Show evaluated TH declarations in a .th.hs file
.TP
.B \fI\%\-dunique\-increment=⟨i⟩\fP
Set the increment for the generated \fBUnique\fP\(aqs to ⟨i⟩.
.TP
.B \fI\%\-dverbose\-core2core\fP
Show output from each core\-to\-core pass
.TP
.B \fI\%\-dverbose\-stg2stg\fP
Show output from each STG\-to\-STG pass
.TP
.B \fI\%\-falignment\-sanitisation\fP
Compile with alignment checks for all info table dereferences.
.TP
.B \fI\%\-fcatch\-bottoms\fP
Insert \fBerror\fP expressions after bottoming expressions; useful
when debugging the compiler.
.TP
.B \fI\%\-fllvm\-fill\-undef\-with\-garbage\fP
Intruct LLVM to fill dead STG registers with garbage
.TP
.B \fI\%\-g\fP
Produce DWARF debug information in compiled object files.
⟨n⟩ can be 0, 1, or 2, with higher numbers producing richer
output. If ⟨n⟩ is omitted level 2 is assumed.
.UNINDENT
.SS C pre\-processor
.INDENT 0.0
.TP
.B \fI\%\-cpp\fP
Run the C pre\-processor on Haskell source files
.TP
.B \fI\%\-D⟨symbol⟩[=⟨value⟩]\fP
Define a symbol in the C pre\-processor
.TP
.B \fI\%\-I⟨dir⟩\fP
Add ⟨dir⟩ to the directory search list for \fB#include\fP files
.TP
.B \fI\%\-U⟨symbol⟩\fP
Undefine a symbol in the C pre\-processor
.UNINDENT
.SS Finding imports
.INDENT 0.0
.TP
.B \fI\%\-i\fP
Empty the import directory list
.TP
.B \fI\%\-i⟨dir⟩[:⟨dir⟩]*\fP
add ⟨dir⟩, ⟨dir2⟩, etc. to import path
.UNINDENT
.SS Interactive mode
.INDENT 0.0
.TP
.B \fI\%\-fbreak\-on\-error\fP
\fI\%Break on uncaught exceptions and errors\fP
.TP
.B \fI\%\-fbreak\-on\-exception\fP
\fI\%Break on any exception thrown\fP
.TP
.B \fI\%\-fghci\-hist\-size=⟨n⟩\fP
Set the number of entries GHCi keeps for \fB:history\fP\&.
See \fI\%The GHCi Debugger\fP\&.
.TP
.B \fI\%\-flocal\-ghci\-history\fP
Use current directory for the GHCi command history
file \fB\&.ghci\-history\fP\&.
.TP
.B \fI\%\-fprint\-bind\-result\fP
\fI\%Turn on printing of binding results in GHCi\fP
.TP
.B \fI\%\-fshow\-loaded\-modules\fP
Show the names of modules that GHCi loaded after a
\fI\%:load\fP command.
.TP
.B \fI\%\-ghci\-script\fP
Read additional \fB\&.ghci\fP files
.TP
.B \fI\%\-ignore\-dot\-ghci\fP
Disable reading of \fB\&.ghci\fP files
.TP
.B \fI\%\-interactive\-print ⟨expr⟩\fP
\fI\%Select the function to use for printing evaluated
expressions in GHCi\fP
.UNINDENT
.SS Interface files
.INDENT 0.0
.TP
.B \fB\-\-show\-iface ⟨file⟩\fP
See \fImodes\fP\&.
.TP
.B \fI\%\-ddump\-hi\fP
Dump the new interface to stdout
.TP
.B \fI\%\-ddump\-hi\-diffs\fP
Show the differences vs. the old interface
.TP
.B \fI\%\-ddump\-minimal\-imports\fP
Dump a minimal set of imports
.UNINDENT
.SS Keeping intermediate files
.INDENT 0.0
.TP
.B \fI\%\-keep\-hc\-file\fP
Retain intermediate \fB\&.hc\fP files.
.TP
.B \fI\%\-keep\-hi\-files\fP
Retain intermediate \fB\&.hi\fP files (the default).
.TP
.B \fI\%\-keep\-llvm\-file\fP
Retain intermediate LLVM \fB\&.ll\fP files.
Implies \fB\-fllvm\fP\&.
.TP
.B \fI\%\-keep\-o\-files\fP
Retain intermediate \fB\&.o\fP files (the default).
.TP
.B \fI\%\-keep\-s\-file\fP
Retain intermediate \fB\&.s\fP files.
.TP
.B \fI\%\-keep\-tmp\-files\fP
Retain all intermediate temporary files.
.UNINDENT
.SS Language options
.INDENT 0.0
.TP
.B \fI\%\-XAllowAmbiguousTypes\fP
Allow the user to write ambiguous types, and
the type inference engine to infer them.
.TP
.B \fI\%\-XApplicativeDo\fP
Enable Applicative do\-notation desugaring
.TP
.B \fI\%\-XArrows\fP
Enable arrow notation extension
.TP
.B \fI\%\-XBangPatterns\fP
Enable bang patterns.
.TP
.B \fI\%\-XBinaryLiterals\fP
Enable support for binary literals.
.TP
.B \fI\%\-XCApiFFI\fP
Enable the CAPI calling convention.
.TP
.B \fI\%\-XConstrainedClassMethods\fP
Enable constrained class methods.
.TP
.B \fI\%\-XConstraintKinds\fP
Enable a kind of constraints.
.TP
.B \fI\%\-XCPP\fP
Enable the C preprocessor.
.TP
.B \fI\%\-XDataKinds\fP
Enable datatype promotion.
.TP
.B \fI\%\-XDatatypeContexts\fP
Allow contexts on \fBdata\fP types.
.TP
.B \fI\%\-XDefaultSignatures\fP
Enable default signatures.
.TP
.B \fI\%\-XDeriveAnyClass\fP
Enable deriving for any class.
.TP
.B \fI\%\-XDeriveDataTypeable\fP
Enable deriving for the Data class.
Implied by \fBAutoDeriveTypeable\fP\&.
.TP
.B \fI\%\-XDeriveFoldable\fP
Enable deriving for the Foldable class.
Implied by \fI\%DeriveTraversable\fP\&.
.TP
.B \fI\%\-XDeriveFunctor\fP
Enable deriving for the Functor class.
Implied by \fI\%DeriveTraversable\fP\&.
.TP
.B \fI\%\-XDeriveGeneric\fP
Enable deriving for the Generic class.
.TP
.B \fI\%\-XDeriveLift\fP
Enable deriving for the Lift class
.TP
.B \fI\%\-XDeriveTraversable\fP
Enable deriving for the Traversable class.
Implies \fI\%DeriveFunctor\fP and \fI\%DeriveFoldable\fP\&.
.TP
.B \fI\%\-XDerivingStrategies\fP
Enables deriving strategies.
.TP
.B \fI\%\-XDisambiguateRecordFields\fP
Enable record field disambiguation.
Implied by \fI\%RecordWildCards\fP\&.
.TP
.B \fI\%\-XDuplicateRecordFields\fP
Allow definition of record types with identically\-named fields.
.TP
.B \fI\%\-XEmptyCase\fP
Allow empty case alternatives.
.TP
.B \fI\%\-XEmptyDataDecls\fP
Allow definition of empty \fBdata\fP types.
.TP
.B \fI\%\-XEmptyDataDeriving\fP
Allow deriving instances of standard type classes for
empty data types.
.TP
.B \fI\%\-XExistentialQuantification\fP
Enable liberalised type synonyms.
.TP
.B \fI\%\-XExplicitForAll\fP
Enable explicit universal quantification.
Implied by \fI\%ScopedTypeVariables\fP, \fI\%LiberalTypeSynonyms\fP,
\fI\%RankNTypes\fP and \fI\%ExistentialQuantification\fP\&.
.TP
.B \fI\%\-XExplicitNamespaces\fP
Enable using the keyword \fBtype\fP to specify the namespace of
entries in imports and exports (\fI\%Explicit namespaces in import/export\fP).
Implied by \fI\%TypeOperators\fP and \fI\%TypeFamilies\fP\&.
.TP
.B \fI\%\-XExtendedDefaultRules\fP
Use GHCi\(aqs extended default rules in a normal module.
.TP
.B \fI\%\-XFlexibleContexts\fP
Enable flexible contexts. Implied by
\fI\%ImplicitParams\fP\&.
.TP
.B \fI\%\-XFlexibleInstances\fP
Enable flexible instances.
Implies \fI\%TypeSynonymInstances\fP\&.
Implied by \fI\%ImplicitParams\fP\&.
.TP
.B \fI\%\-XForeignFunctionInterface\fP
Enable foreign function interface.
.TP
.B \fI\%\-XFunctionalDependencies\fP
Enable functional dependencies.
Implies \fI\%MultiParamTypeClasses\fP\&.
.TP
.B \fI\%\-XGADTs\fP
Enable generalised algebraic data types.
Implies \fI\%GADTSyntax\fP and \fI\%MonoLocalBinds\fP\&.
.TP
.B \fI\%\-XGADTSyntax\fP
Enable generalised algebraic data type syntax.
.TP
.B \fI\%\-XGeneralisedNewtypeDeriving\fP
Enable newtype deriving.
.TP
.B \fI\%\-XGeneralizedNewtypeDeriving\fP
Enable newtype deriving.
.TP
.B \fI\%\-XHexFloatLiterals\fP
Enable support for \fI\%hexadecimal floating point literals\fP\&.
.TP
.B \fI\%\-XImplicitParams\fP
Enable Implicit Parameters.
Implies \fI\%FlexibleContexts\fP and \fI\%FlexibleInstances\fP\&.
.TP
.B \fI\%\-XImpredicativeTypes\fP
Enable impredicative types.
Implies \fI\%RankNTypes\fP\&.
.TP
.B \fI\%\-XIncoherentInstances\fP
Enable incoherent instances.
Implies \fI\%OverlappingInstances\fP\&.
.TP
.B \fI\%\-XInstanceSigs\fP
Enable instance signatures.
.TP
.B \fI\%\-XInterruptibleFFI\fP
Enable interruptible FFI.
.TP
.B \fI\%\-XKindSignatures\fP
Enable kind signatures.
Implied by \fI\%TypeFamilies\fP and \fI\%PolyKinds\fP\&.
.TP
.B \fI\%\-XLambdaCase\fP
Enable lambda\-case expressions.
.TP
.B \fI\%\-XLiberalTypeSynonyms\fP
Enable liberalised type synonyms.
.TP
.B \fI\%\-XMagicHash\fP
Allow \fB#\fP as a postfix modifier on identifiers.
.TP
.B \fI\%\-XMonadComprehensions\fP
Enable monad comprehensions.
.TP
.B \fI\%\-XMonadFailDesugaring\fP
Enable monadfail desugaring.
.TP
.B \fI\%\-XMonoLocalBinds\fP
Enable do not generalise local bindings.
Implied by \fI\%TypeFamilies\fP and \fI\%GADTs\fP\&.
.TP
.B \fI\%\-XMultiParamTypeClasses\fP
Enable multi parameter type classes.
Implied by \fI\%FunctionalDependencies\fP\&.
.TP
.B \fI\%\-XMultiWayIf\fP
Enable multi\-way if\-expressions.
.TP
.B \fI\%\-XNamedFieldPuns\fP
Enable record puns.
.TP
.B \fI\%\-XNamedWildCards\fP
Enable named wildcards.
.TP
.B \fI\%\-XNegativeLiterals\fP
Enable support for negative literals.
.TP
.B \fI\%\-XNoImplicitPrelude\fP
Don\(aqt implicitly \fBimport Prelude\fP\&.
Implied by \fI\%RebindableSyntax\fP\&.
.TP
.B \fI\%\-XNoMonomorphismRestriction\fP
Disable the monomorphism restriction.
.TP
.B \fI\%\-XNoPatternGuards\fP
Disable pattern guards.
Implied by \fBHaskell98\fP\&.
.TP
.B \fI\%\-XNoTraditionalRecordSyntax\fP
Disable support for traditional record syntax
(as supported by Haskell 98) \fBC {f = x}\fP
.TP
.B \fI\%\-XNPlusKPatterns\fP
Enable support for \fBn+k\fP patterns.
Implied by \fBHaskell98\fP\&.
.TP
.B \fI\%\-XNullaryTypeClasses\fP
Deprecated, does nothing. nullary (no parameter) type
classes are now enabled using \fI\%MultiParamTypeClasses\fP\&.
.TP
.B \fI\%\-XNumDecimals\fP
Enable support for \(aqfractional\(aq integer literals.
.TP
.B \fI\%\-XOverlappingInstances\fP
Enable overlapping instances.
.TP
.B \fI\%\-XOverloadedLabels\fP
Enable overloaded labels.
.TP
.B \fI\%\-XOverloadedLists\fP
Enable overloaded lists.
.TP
.B \fI\%\-XOverloadedStrings\fP
Enable overloaded string literals.
.TP
.B \fI\%\-XPackageImports\fP
Enable package\-qualified imports.
.TP
.B \fI\%\-XParallelListComp\fP
Enable parallel list comprehensions.
Implied by \fBParallelArrays\fP\&.
.TP
.B \fI\%\-XPartialTypeSignatures\fP
Enable partial type signatures.
.TP
.B \fI\%\-XPatternSynonyms\fP
Enable pattern synonyms.
.TP
.B \fI\%\-XPolyKinds\fP
Enable kind polymorphism.
Implies \fI\%KindSignatures\fP\&.
.TP
.B \fI\%\-XPostfixOperators\fP
Enable postfix operators.
.TP
.B \fI\%\-XQuasiQuotes\fP
Enable quasiquotation.
.TP
.B \fI\%\-XRank2Types\fP
Enable rank\-2 types.
Synonym for \fI\%RankNTypes\fP\&.
.TP
.B \fI\%\-XRankNTypes\fP
Enable rank\-N types.
Implied by \fI\%ImpredicativeTypes\fP\&.
.TP
.B \fI\%\-XRebindableSyntax\fP
Employ rebindable syntax.
Implies \fI\%NoImplicitPrelude\fP\&.
.TP
.B \fI\%\-XRecordWildCards\fP
Enable record wildcards.
Implies \fI\%DisambiguateRecordFields\fP\&.
.TP
.B \fI\%\-XRecursiveDo\fP
Enable recursive do (mdo) notation.
.TP
.B \fI\%\-XRoleAnnotations\fP
Enable role annotations.
.TP
.B \fI\%\-XSafe\fP
Enable the \fI\%Safe Haskell\fP Safe mode.
.TP
.B \fI\%\-XScopedTypeVariables\fP
Enable lexically\-scoped type variables.
.TP
.B \fI\%\-XStandaloneDeriving\fP
Enable standalone deriving.
.TP
.B \fI\%\-XStaticPointers\fP
Enable static pointers.
.TP
.B \fI\%\-XStrict\fP
Make bindings in the current module strict by default.
.TP
.B \fI\%\-XStrictData\fP
Enable default strict datatype fields.
.TP
.B \fI\%\-XTemplateHaskell\fP
Enable Template Haskell.
.TP
.B \fI\%\-XTemplateHaskellQuotes\fP
Enable quotation subset of
\fI\%Template Haskell\fP\&.
.TP
.B \fI\%\-XTransformListComp\fP
Enable generalised list comprehensions.
.TP
.B \fI\%\-XTrustworthy\fP
Enable the \fI\%Safe Haskell\fP Trustworthy mode.
.TP
.B \fI\%\-XTupleSections\fP
Enable tuple sections.
.TP
.B \fI\%\-XTypeApplications\fP
Enable type application syntax.
.TP
.B \fI\%\-XTypeFamilies\fP
Enable type families.
Implies \fI\%ExplicitNamespaces\fP, \fI\%KindSignatures\fP,
and \fI\%MonoLocalBinds\fP\&.
.TP
.B \fI\%\-XTypeFamilyDependencies\fP
Enable injective type families.
Implies \fI\%TypeFamilies\fP\&.
.TP
.B \fI\%\-XTypeInType\fP
Allow kinds to be used as types,
including explicit kind variable quantification, higher\-rank
kinds, kind synonyms, and kind families.
Implies \fI\%DataKinds\fP, \fI\%KindSignatures\fP,
and \fI\%PolyKinds\fP\&.
.TP
.B \fI\%\-XTypeOperators\fP
Enable type operators.
Implies \fI\%ExplicitNamespaces\fP\&.
.TP
.B \fI\%\-XTypeSynonymInstances\fP
Enable type synonyms in instance heads.
Implied by \fI\%FlexibleInstances\fP\&.
.TP
.B \fI\%\-XUnboxedSums\fP
Enable unboxed sums.
.TP
.B \fI\%\-XUnboxedTuples\fP
Enable the use of unboxed tuple syntax.
.TP
.B \fI\%\-XUndecidableInstances\fP
Enable undecidable instances.
.TP
.B \fI\%\-XUndecidableSuperClasses\fP
Allow all superclass constraints, including those that may
result in non\-termination of the typechecker.
.TP
.B \fI\%\-XUnicodeSyntax\fP
Enable unicode syntax.
.TP
.B \fI\%\-XUnsafe\fP
Enable \fI\%Safe Haskell\fP Unsafe mode.
.TP
.B \fI\%\-XViewPatterns\fP
Enable view patterns.
.UNINDENT
.SS Linking options
.INDENT 0.0
.TP
.B \fB\-c\fP
Stop after generating object (\fB\&.o\fP) file
.TP
.B \fI\%\-debug\fP
Use the debugging runtime
.TP
.B \fI\%\-dylib\-install\-name ⟨path⟩\fP
Set the install name (via \fB\-install_name\fP passed to Apple\(aqs
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)
.TP
.B \fI\%\-dynamic\fP
Build dynamically\-linked object files and executables
.TP
.B \fI\%\-dynload\fP
Selects one of a number of modes for finding shared libraries at runtime.
.TP
.B \fI\%\-eventlog\fP
Enable runtime event tracing
.TP
.B \fI\%\-fno\-embed\-manifest\fP
Do not embed the manifest in the executable (Windows only)
.TP
.B \fI\%\-fno\-gen\-manifest\fP
Do not generate a manifest file (Windows only)
.TP
.B \fI\%\-fno\-shared\-implib\fP
Don\(aqt generate an import library for a DLL (Windows only)
.TP
.B \fI\%\-framework ⟨name⟩\fP
On Darwin/OS X/iOS only, link in the framework ⟨name⟩. This
option corresponds to the \fB\-framework\fP option for Apple\(aqs Linker.
.TP
.B \fI\%\-framework\-path ⟨dir⟩\fP
On Darwin/OS X/iOS only, add ⟨dir⟩ to the list of directories
searched for frameworks. This option corresponds to the \fB\-F\fP
option for Apple\(aqs Linker.
.TP
.B \fI\%\-fwhole\-archive\-hs\-libs\fP
When linking a binary executable, this inserts the flag
\fB\-Wl,\-\-whole\-archive\fP before any \fB\-l\fP flags for Haskell
libraries, and \fB\-Wl,\-\-no\-whole\-archive\fP afterwards
.TP
.B \fI\%\-L ⟨dir⟩\fP
Add ⟨dir⟩ to the list of directories searched for libraries
.TP
.B \fI\%\-l ⟨lib⟩\fP
Link in library ⟨lib⟩
.TP
.B \fI\%\-main\-is ⟨thing⟩\fP
Set main module and function
.TP
.B \fI\%\-no\-hs\-main\fP
Don\(aqt assume this program contains \fBmain\fP
.TP
.B \fI\%\-no\-rtsopts\-suggestions\fP
Don\(aqt print RTS suggestions about linking with
\fI\%\-rtsopts[=⟨none|some|all⟩]\fP\&.
.TP
.B \fI\%\-package ⟨name⟩\fP
Expose package ⟨pkg⟩
.TP
.B \fI\%\-pie\fP
Instruct the linker to produce a position\-independent executable.
.TP
.B \fI\%\-rdynamic\fP
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
\fB\-optl \-rdynamic\fP on Linux, and \fB\-optl \-export\-all\-symbols\fP
on Windows.
.TP
.B \fI\%\-rtsopts[=⟨none|some|all⟩]\fP
Control whether the RTS behaviour can be tweaked via command\-line
flags and the \fBGHCRTS\fP environment variable. Using \fBnone\fP
means no RTS flags can be given; \fBsome\fP means only a minimum
of safe options can be given (the default), and \fBall\fP (or no
argument at all) means that all RTS flags are permitted.
.TP
.B \fI\%\-shared\fP
Generate a shared library (as opposed to an executable)
.TP
.B \fI\%\-split\-objs\fP
Split objects (for libraries)
.TP
.B \fI\%\-split\-sections\fP
Split sections for link\-time dead\-code stripping
.TP
.B \fI\%\-static\fP
Use static Haskell libraries
.TP
.B \fI\%\-staticlib\fP
Generate a standalone static library (as opposed to an
executable). This is useful when cross compiling. The
library together with all its dependencies ends up in in a
single static library that can be linked against.
.TP
.B \fI\%\-threaded\fP
Use the threaded runtime
.TP
.B \fI\%\-with\-rtsopts=⟨opts⟩\fP
Set the default RTS options to ⟨opts⟩.
.UNINDENT
.SS Miscellaneous options
.INDENT 0.0
.TP
.B \fI\%\-fexternal\-interpreter\fP
Run interpreted code in a separate process
.TP
.B \fI\%\-fglasgow\-exts\fP
Deprecated. Enable most language extensions;
see \fI\%Language options\fP for exactly which ones.
.TP
.B \fI\%\-ghcversion\-file ⟨path to ghcversion.h⟩\fP
(GHC as a C compiler only) Use this \fBghcversion.h\fP file
.TP
.B \fI\%\-H ⟨size⟩\fP
Set the minimum size of the heap to ⟨size⟩
.TP
.B \fI\%\-j[⟨n⟩]\fP
When compiling with \fI\%\-\-make\fP, compile ⟨n⟩ modules
in parallel.
.UNINDENT
.SS Modes of operation
.INDENT 0.0
.TP
.B \fI\%\-\-frontend ⟨module⟩\fP
run GHC with the given frontend plugin; see
\fIfrontend_plugins\fP for details.
.TP
.B \fI\%\-\-help\fP
Display help
.TP
.B \fI\%\-\-info\fP
display information about the compiler
.TP
.B \fI\%\-\-interactive\fP
Interactive mode \- normally used by just running \fBghci\fP;
see \fIghci\fP for details.
.TP
.B \fI\%\-\-make\fP
Build a multi\-module Haskell program, automatically figuring out
dependencies. Likely to be much easier, and faster, than using
\fBmake\fP; see \fI\%Using ghc \-\-make\fP for details.
.TP
.B \fI\%\-\-mk\-dll\fP
DLL\-creation mode (Windows only)
.TP
.B \fI\%\-\-numeric\-version\fP
display GHC version (numeric only)
.TP
.B \fI\%\-\-print\-libdir\fP
display GHC library directory
.TP
.B \fI\%\-\-show\-iface ⟨file⟩\fP
display the contents of an interface file.
.TP
.B \fI\%\-\-show\-options\fP
display the supported command line options
.TP
.B \fI\%\-\-supported\-extensions\fP
display the supported language extensions
.TP
.B \fI\%\-\-version\fP
display GHC version
.TP
.B \fI\%\-e ⟨expr⟩\fP
Evaluate \fBexpr\fP; see \fI\%Expression evaluation mode\fP for details.
.TP
.B \fI\%\-M\fP
generate dependency information suitable for use in a
\fBMakefile\fP; see \fImakefile\-dependencies\fP for details.
.UNINDENT
.SS Individual optimizations
.INDENT 0.0
.TP
.B \fI\%\-fcall\-arity\fP
Enable call\-arity optimisation. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fcase\-folding\fP
Enable constant folding in case expressions. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fcase\-merge\fP
Enable case\-merging. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fcmm\-elim\-common\-blocks\fP
Enable Cmm common block elimination. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fcmm\-sink\fP
Enable Cmm sinking. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fcpr\-anal\fP
Turn on CPR analysis in the demand analyser. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fcross\-module\-specialise\fP
Turn on specialisation of overloaded functions imported from
other modules.
.TP
.B \fI\%\-fcse\fP
Enable common sub\-expression elimination. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fdicts\-cheap\fP
Make dictionary\-valued expressions seem cheap to the optimiser.
.TP
.B \fI\%\-fdicts\-strict\fP
Make dictionaries strict
.TP
.B \fI\%\-fdmd\-tx\-dict\-sel\fP
Use a special demand transformer for dictionary selectors.
Always enabled by default.
.TP
.B \fI\%\-fdo\-eta\-reduction\fP
Enable eta\-reduction. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fdo\-lambda\-eta\-expansion\fP
Enable lambda eta\-expansion. Always enabled by default.
.TP
.B \fI\%\-feager\-blackholing\fP
Turn on \fIeager blackholing\fP
.TP
.B \fI\%\-fenable\-rewrite\-rules\fP
Switch on all rewrite rules (including rules generated by
automatic specialisation of overloaded functions). Implied by
\fB\-O\fP\&.
.TP
.B \fI\%\-fexcess\-precision\fP
Enable excess intermediate precision
.TP
.B \fI\%\-fexitification\fP
Enables exitification optimisation. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fexpose\-all\-unfoldings\fP
Expose all unfoldings, even for very large or recursive functions.
.TP
.B \fI\%\-ffloat\-in\fP
Turn on the float\-in transformation. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-ffull\-laziness\fP
Turn on full laziness (floating bindings outwards).
Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-ffun\-to\-thunk\fP
Allow worker\-wrapper to convert a function closure into a thunk
if the function does not use any of its arguments. Off by default.
.TP
.B \fI\%\-fignore\-asserts\fP
Ignore assertions in the source. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fignore\-interface\-pragmas\fP
Ignore pragmas in interface files. Implied by \fI\%\-O0\fP only.
.TP
.B \fI\%\-flate\-dmd\-anal\fP
Run demand analysis again, at the end of the
simplification pipeline
.TP
.B \fI\%\-fliberate\-case\fP
Turn on the liberate\-case transformation. Implied by \fI\%\-O2\fP\&.
.TP
.B \fI\%\-fliberate\-case\-threshold=⟨n⟩\fP
\fIdefault: 2000.\fP Set the size threshold for the liberate\-case
transformation to ⟨n⟩
.TP
.B \fI\%\-fllvm\-pass\-vectors\-in\-regs\fP
Pass vector value in vector registers for function calls
.TP
.B \fI\%\-floopification\fP
Turn saturated self\-recursive tail\-calls into local jumps in the
generated assembly. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fmax\-inline\-alloc\-size=⟨n⟩\fP
\fIdefault: 128.\fP Set the maximum size of inline array allocations
to ⟨n⟩ bytes (default: 128).
.TP
.B \fI\%\-fmax\-inline\-memcpy\-insns=⟨n⟩\fP
\fIdefault: 32.\fP Inline \fBmemcpy\fP calls if they would generate no
more than ⟨n⟩ pseudo instructions.
.TP
.B \fI\%\-fmax\-inline\-memset\-insns=⟨n⟩\fP
\fIdefault: 32.\fP Inline \fBmemset\fP calls if they would generate no
more than ⟨n⟩ pseudo instructions
.TP
.B \fI\%\-fmax\-relevant\-binds=⟨n⟩\fP
\fIdefault: 6.\fP Set the maximum number of bindings to display in
type error messages.
.TP
.B \fI\%\-fmax\-simplifier\-iterations=⟨n⟩\fP
\fIdefault: 4.\fP Set the max iterations for the simplifier.
.TP
.B \fI\%\-fmax\-uncovered\-patterns=⟨n⟩\fP
\fIdefault: 4.\fP Set the maximum number of patterns to display in
warnings about non\-exhaustive ones.
.TP
.B \fI\%\-fmax\-valid\-substitutions=⟨n⟩\fP
\fIdefault: 6.\fP Set the maximum number of valid substitutions for
typed holes to display in type error messages.
.TP
.B \fI\%\-fmax\-worker\-args=⟨n⟩\fP
\fIdefault: 10.\fP If a worker has that many arguments, none will
be unpacked anymore.
.TP
.B \fI\%\-fno\-opt\-coercion\fP
Turn off the coercion optimiser
.TP
.B \fI\%\-fno\-pre\-inlining\fP
Turn off pre\-inlining
.TP
.B \fI\%\-fno\-state\-hack\fP
Turn off the state hackwhereby any lambda with a real\-world
state token as argument is considered to be single\-entry. Hence
OK to inline things inside it.
.TP
.B \fI\%\-fomit\-interface\-pragmas\fP
Don\(aqt generate interface pragmas. Implied by \fI\%\-O0\fP only.
.TP
.B \fI\%\-fomit\-yields\fP
Omit heap checks when no allocation is being performed.
.TP
.B \fI\%\-foptimal\-applicative\-do\fP
Use a slower but better algorithm for ApplicativeDo
.TP
.B \fI\%\-fpedantic\-bottoms\fP
Make GHC be more precise about its treatment of bottom (but see
also \fI\%\-fno\-state\-hack\fP). In particular, GHC will not
eta\-expand through a case expression.
.TP
.B \fI\%\-fregs\-graph\fP
Use the graph colouring register allocator for register
allocation in the native code generator. Implied by \fI\%\-O2\fP\&.
.TP
.B \fI\%\-fregs\-iterative\fP
Use the iterative coalescing graph colouring register allocator
in the native code generator.
.TP
.B \fI\%\-fsimpl\-tick\-factor=⟨n⟩\fP
\fIdefault: 100.\fP Set the percentage factor for simplifier ticks.
.TP
.B \fI\%\-fsimplifier\-phases=⟨n⟩\fP
\fIdefault: 2.\fP Set the number of phases for the simplifier.
Ignored with \fI\%\-O0\fP\&.
.TP
.B \fI\%\-fsolve\-constant\-dicts\fP
When solving constraints, try to eagerly solve
super classes using available dictionaries.
.TP
.B \fI\%\-fspec\-constr\fP
Turn on the SpecConstr transformation. Implied by \fI\%\-O2\fP\&.
.TP
.B \fI\%\-fspec\-constr\-count=⟨n⟩\fP
default: 3.* Set to ⟨n⟩ the maximum number of specialisations that
will be created for any one function by the SpecConstr
transformation.
.TP
.B \fI\%\-fspec\-constr\-keen\fP
Specialize a call with an explicit constructor argument,
even if the argument is not scrutinised in the body of the function
.TP
.B \fI\%\-fspec\-constr\-threshold=⟨n⟩\fP
\fIdefault: 2000.\fP Set the size threshold for the SpecConstr
transformation to ⟨n⟩.
.TP
.B \fI\%\-fspecialise\fP
Turn on specialisation of overloaded functions. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-fspecialise\-aggressively\fP
Turn on specialisation of overloaded functions regardless of
size, if unfolding is available
.TP
.B \fI\%\-fstatic\-argument\-transformation\fP
Turn on the static argument transformation.
.TP
.B \fI\%\-fstg\-cse\fP
Enable common sub\-expression elimination on the STG
intermediate language
.TP
.B \fI\%\-fstrictness\fP
Turn on strictness analysis.
Implied by \fI\%\-O\fP\&. Implies \fB\-fworker\-wrapper\fP
.TP
.B \fI\%\-fstrictness\-before=⟨n⟩\fP
Run an additional strictness analysis before simplifier phase ⟨n⟩
.TP
.B \fI\%\-funbox\-small\-strict\-fields\fP
Flatten strict constructor fields with a pointer\-sized
representation. Implied by \fI\%\-O\fP\&.
.TP
.B \fI\%\-funbox\-strict\-fields\fP
Flatten strict constructor fields
.TP
.B \fI\%\-funfolding\-creation\-threshold=⟨n⟩\fP
\fIdefault: 750.\fP Tweak unfolding settings.
.TP
.B \fI\%\-funfolding\-dict\-discount=⟨n⟩\fP
\fIdefault: 30.\fP Tweak unfolding settings.
.TP
.B \fI\%\-funfolding\-fun\-discount=⟨n⟩\fP
\fIdefault: 60.\fP Tweak unfolding settings.
.TP
.B \fI\%\-funfolding\-keeness\-factor=⟨n⟩\fP
\fIdefault: 1.5.\fP Tweak unfolding settings.
.TP
.B \fI\%\-funfolding\-use\-threshold=⟨n⟩\fP
\fIdefault: 60.\fP Tweak unfolding settings.
.TP
.B \fI\%\-fvectorisation\-avoidance\fP
Enable vectorisation avoidance. Always enabled by default.
.TP
.B \fI\%\-fvectorise\fP
Enable vectorisation of nested data parallelism
.UNINDENT
.SS Optimization levels
.INDENT 0.0
.TP
.B \fI\%\-O\fP
Enable level 1 optimisations
.TP
.B \fI\%\-O0\fP
Disable optimisations (default)
.TP
.B \fI\%\-O2\fP
Enable level 2 optimisations
.TP
.B \fI\%\-Odph\fP
Enable level 2 optimisations, set
\fB\-fmax\-simplifier\-iterations=20\fP
and \fB\-fsimplifier\-phases=3\fP\&.
.UNINDENT
.SS Package options
.INDENT 0.0
.TP
.B \fI\%\-clear\-package\-db\fP
Clear the package db stack.
.TP
.B \fI\%\-distrust ⟨pkg⟩\fP
Expose package ⟨pkg⟩ and set it to be distrusted. See
\fI\%Safe Haskell\fP\&.
.TP
.B \fI\%\-distrust\-all\-packages\fP
Distrust all packages by default. See \fI\%Safe Haskell\fP\&.
.TP
.B \fI\%\-fpackage\-trust\fP
Enable \fI\%Safe Haskell\fP trusted package
requirement for trustworthy modules.
.TP
.B \fI\%\-global\-package\-db\fP
Add the global package db to the stack.
.TP
.B \fI\%\-hide\-all\-packages\fP
Hide all packages by default
.TP
.B \fI\%\-hide\-package ⟨pkg⟩\fP
Hide package ⟨pkg⟩
.TP
.B \fI\%\-ignore\-package ⟨pkg⟩\fP
Ignore package ⟨pkg⟩
.TP
.B \fI\%\-no\-auto\-link\-packages\fP
Don\(aqt automatically link in the base and rts packages.
.TP
.B \fI\%\-no\-global\-package\-db\fP
Remove the global package db from the stack.
.TP
.B \fI\%\-no\-user\-package\-db\fP
Remove the user\(aqs package db from the stack.
.TP
.B \fI\%\-package ⟨pkg⟩\fP
Expose package ⟨pkg⟩
.TP
.B \fI\%\-package\-db ⟨file⟩\fP
Add ⟨file⟩ to the package db stack.
.TP
.B \fI\%\-package\-env ⟨file⟩|⟨name⟩\fP
Use the specified package environment.
.TP
.B \fI\%\-package\-id ⟨unit\-id⟩\fP
Expose package by id ⟨unit\-id⟩
.TP
.B \fI\%\-this\-unit\-id ⟨unit\-id⟩\fP
Compile to be part of unit (i.e. package)
⟨unit\-id⟩
.TP
.B \fI\%\-trust ⟨pkg⟩\fP
Expose package ⟨pkg⟩ and set it to be trusted. See
\fI\%Safe Haskell\fP\&.
.TP
.B \fI\%\-user\-package\-db\fP
Add the user\(aqs package db to the stack.
.UNINDENT
.SS Phases of compilation
.INDENT 0.0
.TP
.B \fI\%\-C\fP
Stop after generating C (\fB\&.hc\fP file)
.TP
.B \fI\%\-c\fP
Stop after generating object (\fB\&.o\fP) file
.TP
.B \fI\%\-E\fP
Stop after preprocessing (\fB\&.hspp\fP file)
.TP
.B \fI\%\-F\fP
Enable the use of a \fI\%pre\-processor\fP
(set with \fI\%\-pgmF ⟨cmd⟩\fP)
.TP
.B \fI\%\-S\fP
Stop after generating assembly (\fB\&.s\fP file)
.TP
.B \fI\%\-x ⟨suffix⟩\fP
Override default behaviour for source files
.UNINDENT
.SS Overriding external programs
.INDENT 0.0
.TP
.B \fI\%\-pgma ⟨cmd⟩\fP
Use ⟨cmd⟩ as the assembler
.TP
.B \fI\%\-pgmc ⟨cmd⟩\fP
Use ⟨cmd⟩ as the C compiler
.TP
.B \fI\%\-pgmdll ⟨cmd⟩\fP
Use ⟨cmd⟩ as the DLL generator
.TP
.B \fI\%\-pgmF ⟨cmd⟩\fP
Use ⟨cmd⟩ as the pre\-processor (with \fB\-F\fP only)
.TP
.B \fI\%\-pgmi ⟨cmd⟩\fP
Use ⟨cmd⟩ as the external interpreter command.
.TP
.B \fI\%\-pgmL ⟨cmd⟩\fP
Use ⟨cmd⟩ as the literate pre\-processor
.TP
.B \fI\%\-pgml ⟨cmd⟩\fP
Use ⟨cmd⟩ as the linker
.TP
.B \fI\%\-pgmlc ⟨cmd⟩\fP
Use ⟨cmd⟩ as the LLVM compiler
.TP
.B \fI\%\-pgmlibtool ⟨cmd⟩\fP
Use ⟨cmd⟩ as the command for libtool (with \fB\-staticlib\fP only).
.TP
.B \fI\%\-pgmlo ⟨cmd⟩\fP
Use ⟨cmd⟩ as the LLVM optimiser
.TP
.B \fI\%\-pgmP ⟨cmd⟩\fP
Use ⟨cmd⟩ as the C pre\-processor (with \fB\-cpp\fP only)
.TP
.B \fI\%\-pgms ⟨cmd⟩\fP
Use ⟨cmd⟩ as the splitter
.TP
.B \fI\%\-pgmwindres ⟨cmd⟩\fP
Use ⟨cmd⟩ as the program for embedding manifests on Windows.
.UNINDENT
.SS Phase\-specific options
.INDENT 0.0
.TP
.B \fI\%\-opta ⟨option⟩\fP
pass ⟨option⟩ to the assembler
.TP
.B \fI\%\-optc ⟨option⟩\fP
pass ⟨option⟩ to the C compiler
.TP
.B \fI\%\-optdll ⟨option⟩\fP
pass ⟨option⟩ to the DLL generator
.TP
.B \fI\%\-optF ⟨option⟩\fP
pass ⟨option⟩ to the custom pre\-processor
.TP
.B \fI\%\-opti ⟨option⟩\fP
pass ⟨option⟩ to the interpreter sub\-process.
.TP
.B \fI\%\-optL ⟨option⟩\fP
pass ⟨option⟩ to the literate pre\-processor
.TP
.B \fI\%\-optl ⟨option⟩\fP
pass ⟨option⟩ to the linker
.TP
.B \fI\%\-optlc ⟨option⟩\fP
pass ⟨option⟩ to the LLVM compiler
.TP
.B \fI\%\-optlo ⟨option⟩\fP
pass ⟨option⟩ to the LLVM optimiser
.TP
.B \fI\%\-optP ⟨option⟩\fP
pass ⟨option⟩ to cpp (with \fB\-cpp\fP only)
.TP
.B \fI\%\-optwindres ⟨option⟩\fP
pass ⟨option⟩ to \fBwindres\fP\&.
.UNINDENT
.SS Platform\-specific options
.INDENT 0.0
.TP
.B \fI\%\-msse2\fP
(x86 only) Use SSE2 for floating\-point operations
.TP
.B \fI\%\-msse4.2\fP
(x86 only) Use SSE4.2 for floating\-point operations
.UNINDENT
.SS Compiler plugins
.INDENT 0.0
.TP
.B \fI\%\-fplugin\-opt=⟨module⟩:⟨args⟩\fP
Give arguments to a plugin module; module must be specified with
\fI\%\-fplugin=⟨module⟩\fP
.TP
.B \fI\%\-fplugin=⟨module⟩\fP
Load a plugin exported by a given module
.TP
.B \fI\%\-hide\-all\-plugin\-packages\fP
Hide all packages for plugins by default
.TP
.B \fI\%\-plugin\-package ⟨pkg⟩\fP
Expose ⟨pkg⟩ for plugins
.TP
.B \fI\%\-plugin\-package\-id ⟨pkg\-id⟩\fP
Expose ⟨pkg\-id⟩ for plugins
.UNINDENT
.SS Profiling
.INDENT 0.0
.TP
.B \fI\%\-fno\-prof\-auto\fP
Disables any previous \fI\%\-fprof\-auto\fP,
\fI\%\-fprof\-auto\-top\fP, or \fI\%\-fprof\-auto\-exported\fP options.
.TP
.B \fI\%\-fno\-prof\-cafs\fP
Disables any previous \fI\%\-fprof\-cafs\fP option.
.TP
.B \fI\%\-fno\-prof\-count\-entries\fP
Do not collect entry counts
.TP
.B \fI\%\-fprof\-auto\fP
Auto\-add \fBSCC\fP\e s to all bindings not marked INLINE
.TP
.B \fI\%\-fprof\-auto\-calls\fP
Auto\-add \fBSCC\fP\e s to all call sites
.TP
.B \fI\%\-fprof\-auto\-exported\fP
Auto\-add \fBSCC\fP\e s to all exported bindings not marked INLINE
.TP
.B \fI\%\-fprof\-auto\-top\fP
Auto\-add \fBSCC\fP\e s to all top\-level bindings not marked INLINE
.TP
.B \fI\%\-fprof\-cafs\fP
Auto\-add \fBSCC\fP\e s to all CAFs
.TP
.B \fI\%\-prof\fP
Turn on profiling
.TP
.B \fI\%\-ticky\fP
\fI\%Turn on ticky\-ticky profiling\fP
.UNINDENT
.SS Program coverage
.INDENT 0.0
.TP
.B \fI\%\-fhpc\fP
Turn on Haskell program coverage instrumentation
.UNINDENT
.SS Recompilation checking
.INDENT 0.0
.TP
.B \fI\%\-fforce\-recomp\fP
Turn off recompilation checking. This is implied by any
\fB\-ddump\-X\fP option when compiling a single file
(i.e. when using \fB\-c\fP).
.TP
.B \fI\%\-fignore\-hpc\-changes\fP
Do not recompile modules just to match changes to
HPC flags. This is especially useful for avoiding recompilation
when using GHCi, and is enabled by default for GHCi.
.TP
.B \fI\%\-fignore\-optim\-changes\fP
Do not recompile modules just to match changes to
optimisation flags. This is especially useful for avoiding
recompilation when using GHCi, and is enabled by default for
GHCi.
.UNINDENT
.SS Redirecting output
.INDENT 0.0
.TP
.B \fI\%\-\-exclude\-module=⟨file⟩\fP
Regard \fB⟨file⟩\fP as "stable"; i.e., exclude it from having
dependencies on it.
.TP
.B \fI\%\-ddump\-mod\-cycles\fP
Dump module cycles
.TP
.B \fI\%\-dep\-makefile ⟨file⟩\fP
Use ⟨file⟩ as the makefile
.TP
.B \fI\%\-dep\-suffix ⟨suffix⟩\fP
Make dependencies that declare that files with suffix
\fB\&.⟨suf⟩⟨osuf⟩\fP depend on interface files with suffix \fB\&.⟨suf⟩hi\fP
.TP
.B \fI\%\-dumpdir ⟨dir⟩\fP
redirect dump files
.TP
.B \fI\%\-hcsuf ⟨suffix⟩\fP
set the suffix to use for intermediate C files
.TP
.B \fI\%\-hidir ⟨dir⟩\fP
set directory for interface files
.TP
.B \fI\%\-hisuf ⟨suffix⟩\fP
set the suffix to use for interface files
.TP
.B \fI\%\-include\-pkg\-deps\fP
Regard modules imported from packages as unstable
.TP
.B \fI\%\-o ⟨file⟩\fP
set output filename
.TP
.B \fI\%\-odir ⟨dir⟩\fP
set directory for object files
.TP
.B \fI\%\-ohi ⟨file⟩\fP
set the filename in which to put the interface
.TP
.B \fI\%\-osuf ⟨suffix⟩\fP
set the output file suffix
.TP
.B \fI\%\-outputdir ⟨dir⟩\fP
set output directory
.TP
.B \fI\%\-stubdir ⟨dir⟩\fP
redirect FFI stub files
.UNINDENT
.SS Temporary files
.INDENT 0.0
.TP
.B \fI\%\-tmpdir ⟨dir⟩\fP
set the directory for temporary files
.UNINDENT
.SS Verbosity options
.INDENT 0.0
.TP
.B \fI\%\-fdiagnostics\-color=⟨always|auto|never⟩\fP
Use colors in error messages
.TP
.B \fI\%\-fdiagnostics\-show\-caret\fP
Whether to show snippets of original source code
.TP
.B \fI\%\-ferror\-spans\fP
Output full span in error messages
.TP
.B \fI\%\-fhide\-source\-paths\fP
hide module source and object paths
.TP
.B \fI\%\-fprint\-equality\-relations\fP
Distinguish between equality relations when printing
.TP
.B \fI\%\-fprint\-expanded\-synonyms\fP
In type errors, also print type\-synonym\-expanded types.
.TP
.B \fI\%\-fprint\-explicit\-coercions\fP
Print coercions in types
.TP
.B \fI\%\-fprint\-explicit\-foralls\fP
Print explicit \fBforall\fP quantification in types.
See also \fB\-XExplicitForAll\fP
.TP
.B \fI\%\-fprint\-explicit\-kinds\fP
Print explicit kind foralls and kind arguments in types.
See also \fB\-XKindSignatures\fP
.TP
.B \fI\%\-fprint\-explicit\-runtime\-rep\fP
Print \fBRuntimeRep\fP variables in types which are
runtime\-representation polymorphic.
.TP
.B \fI\%\-fprint\-explicit\-runtime\-reps\fP
Print \fBRuntimeRep\fP variables in types which are
runtime\-representation polymorphic.
.TP
.B \fI\%\-fprint\-potential\-instances\fP
display all available instances in type error messages
.TP
.B \fI\%\-fprint\-typechecker\-elaboration\fP
Print extra information from typechecker.
.TP
.B \fI\%\-fprint\-unicode\-syntax\fP
Use unicode syntax when printing expressions, types and kinds.
See also \fB\-XUnicodeSyntax\fP
.TP
.B \fI\%\-fshow\-hole\-constraints\fP
Show constraints when reporting typed holes
.TP
.B \fI\%\-Rghc\-timing\fP
Summarise timing stats for GHC (same as \fB+RTS \-tstderr\fP).
.TP
.B \fI\%\-v\fP
verbose mode (equivalent to \fB\-v3\fP)
.TP
.B \fI\%\-v⟨n⟩\fP
set verbosity level
.UNINDENT
.SS Warnings
.INDENT 0.0
.TP
.B \fI\%\-fdefer\-out\-of\-scope\-variables\fP
Convert variable out of scope variables errors into warnings.
Implied by \fI\%\-fdefer\-type\-errors\fP\&.
See also \fI\%\-Wdeferred\-out\-of\-scope\-variables\fP\&.
.TP
.B \fI\%\-fdefer\-type\-errors\fP
Turn type errors into warnings, \fIdeferring the error until
runtime\fP\&. Implies
\fI\%\-fdefer\-typed\-holes\fP and
\fI\%\-fdefer\-out\-of\-scope\-variables\fP\&.
See also \fI\%\-Wdeferred\-type\-errors\fP
.TP
.B \fI\%\-fdefer\-typed\-holes\fP
Convert \fItyped hole\fP errors into warnings,
\fIdeferring the error until runtime\fP\&.
Implied by \fI\%\-fdefer\-type\-errors\fP\&.
See also \fI\%\-Wtyped\-holes\fP\&.
.TP
.B \fI\%\-fhelpful\-errors\fP
Make suggestions for mis\-spelled names.
.TP
.B \fI\%\-fmax\-pmcheck\-iterations=⟨n⟩\fP
the iteration limit for the pattern match checker
.TP
.B \fI\%\-fshow\-warning\-groups\fP
show which group an emitted warning belongs to.
.TP
.B \fI\%\-W\fP
enable normal warnings
.TP
.B \fI\%\-w\fP
disable all warnings
.TP
.B \fI\%\-Wall\fP
enable almost all warnings (details in \fI\%Warnings and sanity\-checking\fP)
.TP
.B \fI\%\-Wall\-missed\-specialisations\fP
warn when specialisation of any overloaded function fails.
.TP
.B \fI\%\-Wamp\fP
\fI(deprecated)\fP warn on definitions conflicting with the
Applicative\-Monad Proposal (AMP)
.TP
.B \fI\%\-Wcompat\fP
enable future compatibility warnings
(details in \fI\%Warnings and sanity\-checking\fP)
.TP
.B \fI\%\-Wcpp\-undef\fP
warn on uses of the \fI#if\fP directive on undefined identifiers
.TP
.B \fI\%\-Wdeferred\-out\-of\-scope\-variables\fP
Report warnings when variable out\-of\-scope errors are
\fIdeferred until runtime\fP\&.
See \fI\%\-fdefer\-out\-of\-scope\-variables\fP\&.
.TP
.B \fI\%\-Wdeferred\-type\-errors\fP
Report warnings when \fIdeferred type errors\fP are enabled. This option is enabled by
default. See \fI\%\-fdefer\-type\-errors\fP\&.
.TP
.B \fI\%\-Wdeprecated\-flags\fP
warn about uses of commandline flags that are deprecated
.TP
.B \fI\%\-Wdeprecations\fP
warn about uses of functions & types that have warnings or
deprecated pragmas. Alias for \fI\%\-Wwarnings\-deprecations\fP
.TP
.B \fI\%\-Wdodgy\-exports\fP
warn about dodgy exports
.TP
.B \fI\%\-Wdodgy\-foreign\-imports\fP
warn about dodgy foreign imports
.TP
.B \fI\%\-Wdodgy\-imports\fP
warn about dodgy imports
.TP
.B \fI\%\-Wduplicate\-constraints\fP
warn when a constraint appears duplicated in a type signature
.TP
.B \fI\%\-Wduplicate\-exports\fP
warn when an entity is exported multiple times
.TP
.B \fI\%\-Wempty\-enumerations\fP
warn about enumerations that are empty
.TP
.B \fI\%\-Werror\fP
make warnings fatal
.TP
.B \fI\%\-Weverything\fP
enable all warnings supported by GHC
.TP
.B \fI\%\-Whi\-shadowing\fP
warn when a \fB\&.hi\fP file in the current directory shadows a library
.TP
.B \fI\%\-Widentities\fP
warn about uses of Prelude numeric conversions that are probably
the identity (and hence could be omitted)
.TP
.B \fI\%\-Wimplicit\-prelude\fP
warn when the Prelude is implicitly imported
.TP
.B \fI\%\-Wincomplete\-patterns\fP
warn when a pattern match could fail
.TP
.B \fI\%\-Wincomplete\-record\-updates\fP
warn when a record update could fail
.TP
.B \fI\%\-Wincomplete\-uni\-patterns\fP
warn when a pattern match in a lambda expression or
pattern binding could fail
.TP
.B \fI\%\-Winline\-rule\-shadowing\fP
Warn if a rewrite RULE might fail to fire because the
function might be inlined before the rule has a chance to fire.
See \fIrules\-inline\fP\&.
.TP
.B \fI\%\-Wmissed\-specialisations\fP
warn when specialisation of an imported, overloaded function
fails.
.TP
.B \fI\%\-Wmissing\-export\-lists\fP
warn when a module declaration does not explicitly list all
exports
.TP
.B \fI\%\-Wmissing\-exported\-signatures\fP
warn about top\-level functions without signatures, only if they
are exported. takes precedence over \-Wmissing\-signatures
.TP
.B \fI\%\-Wmissing\-exported\-sigs\fP
\fI(deprecated)\fP
warn about top\-level functions without signatures, only if they
are exported. takes precedence over \-Wmissing\-signatures
.TP
.B \fI\%\-Wmissing\-fields\fP
warn when fields of a record are uninitialised
.TP
.B \fI\%\-Wmissing\-home\-modules\fP
warn when encountering a home module imported, but not listed
on the command line. Useful for cabal to ensure GHC won\(aqt pick
up modules, not listed neither in \fBexposed\-modules\fP, nor in
\fBother\-modules\fP\&.
.TP
.B \fI\%\-Wmissing\-import\-lists\fP
warn when an import declaration does not explicitly list all the
names brought into scope
.TP
.B \fI\%\-Wmissing\-local\-signatures\fP
warn about polymorphic local bindings without signatures
.TP
.B \fI\%\-Wmissing\-local\-sigs\fP
\fI(deprecated)\fP
warn about polymorphic local bindings without signatures
.TP
.B \fI\%\-Wmissing\-methods\fP
warn when class methods are undefined
.TP
.B \fI\%\-Wmissing\-monadfail\-instances\fP
Warn when a failable pattern is used in a do\-block that does
not have a \fBMonadFail\fP instance.
.TP
.B \fI\%\-Wmissing\-pattern\-synonym\-signatures\fP
warn when pattern synonyms do not have type signatures
.TP
.B \fI\%\-Wmissing\-signatures\fP
warn about top\-level functions without signatures
.TP
.B \fI\%\-Wmonomorphism\-restriction\fP
warn when the Monomorphism Restriction is applied
.TP
.B \fI\%\-Wname\-shadowing\fP
warn when names are shadowed
.TP
.B \fI\%\-Wno\-compat\fP
Disables all warnings enabled by \fI\%\-Wcompat\fP\&.
.TP
.B \fI\%\-Wnoncanonical\-monad\-instances\fP
warn when \fBApplicative\fP or \fBMonad\fP instances have
noncanonical definitions of \fBreturn\fP, \fBpure\fP, \fB(>>)\fP,
or \fB(*>)\fP\&.
See flag description in \fI\%Warnings and sanity\-checking\fP for more details.
.TP
.B \fI\%\-Wnoncanonical\-monadfail\-instances\fP
warn when \fBMonad\fP or \fBMonadFail\fP instances have
noncanonical definitions of \fBfail\fP\&.
See flag description in \fI\%Warnings and sanity\-checking\fP for more details.
.TP
.B \fI\%\-Wnoncanonical\-monoid\-instances\fP
warn when \fBSemigroup\fP or \fBMonoid\fP instances have
noncanonical definitions of \fB(<>)\fP or \fBmappend\fP\&.
See flag description in \fI\%Warnings and sanity\-checking\fP for more details.
.TP
.B \fI\%\-Worphans\fP
warn when the module contains \fIorphan instance declarations
or rewrite rules\fP
.TP
.B \fI\%\-Woverflowed\-literals\fP
warn about literals that will overflow their type
.TP
.B \fI\%\-Woverlapping\-patterns\fP
warn about overlapping patterns
.TP
.B \fI\%\-Wpartial\-fields\fP
warn when defining a partial record field.
.TP
.B \fI\%\-Wpartial\-type\-signatures\fP
warn about holes in partial type signatures when
\fB\-XPartialTypeSignatures\fP is enabled. Not applicable when
\fB\-XPartialTypesignatures\fP is not enabled, in which case
errors are generated for such holes. See
\fIpartial\-type\-signatures\fP\&.
.TP
.B \fI\%\-Wredundant\-constraints\fP
Have the compiler warn about redundant constraints in type
signatures.
.TP
.B \fI\%\-Wsafe\fP
warn if the module being compiled is regarded to be safe.
.TP
.B \fI\%\-Wsemigroup\fP
warn when a \fBMonoid\fP is not \fBSemigroup\fP, and on non\-
\fBSemigroup\fP definitions of \fB(<>)\fP?
.TP
.B \fI\%\-Wsimplifiable\-class\-constraints\fP
2arn about class constraints in a type signature that can
be simplified using a top\-level instance declaration.
.TP
.B \fI\%\-Wtabs\fP
warn if there are tabs in the source file
.TP
.B \fI\%\-Wtrustworthy\-safe\fP
warn if the module being compiled is marked as
\fI\%Trustworthy\fP but it could instead be marked as
\fI\%Safe\fP, a more informative bound.
.TP
.B \fI\%\-Wtype\-defaults\fP
warn when defaulting happens
.TP
.B \fI\%\-Wtyped\-holes\fP
Report warnings when \fItyped hole\fP errors are
\fIdeferred until runtime\fP\&. See
\fI\%\-fdefer\-typed\-holes\fP\&.
.TP
.B \fI\%\-Wunbanged\-strict\-patterns\fP
warn on pattern bind of unlifted variable that is neither bare
nor banged
.TP
.B \fI\%\-Wunrecognised\-pragmas\fP
warn about uses of pragmas that GHC doesn\(aqt recognise
.TP
.B \fI\%\-Wunrecognised\-warning\-flags\fP
throw a warning when an unreconised \fB\-W...\fP flag is
encountered on the command line.
.TP
.B \fI\%\-Wunsafe\fP
warn if the module being compiled is regarded to be unsafe.
See \fI\%Safe Haskell\fP
.TP
.B \fI\%\-Wunsupported\-calling\-conventions\fP
warn about use of an unsupported calling convention
.TP
.B \fI\%\-Wunsupported\-llvm\-version\fP
Warn when using \fB\-fllvm\fP with an unsupported
version of LLVM.
.TP
.B \fI\%\-Wunticked\-promoted\-constructors\fP
warn if promoted constructors are not ticked
.TP
.B \fI\%\-Wunused\-binds\fP
warn about bindings that are unused. Alias for
\fI\%\-Wunused\-top\-binds\fP, \fI\%\-Wunused\-local\-binds\fP and
\fI\%\-Wunused\-pattern\-binds\fP
.TP
.B \fI\%\-Wunused\-do\-bind\fP
warn about do bindings that appear to throw away values of types
other than \fB()\fP
.TP
.B \fI\%\-Wunused\-foralls\fP
warn about type variables in user\-written
\fBforall\fP\es that are unused
.TP
.B \fI\%\-Wunused\-imports\fP
warn about unnecessary imports
.TP
.B \fI\%\-Wunused\-local\-binds\fP
warn about local bindings that are unused
.TP
.B \fI\%\-Wunused\-matches\fP
warn about variables in patterns that aren\(aqt used
.TP
.B \fI\%\-Wunused\-pattern\-binds\fP
warn about pattern match bindings that are unused
.TP
.B \fI\%\-Wunused\-top\-binds\fP
warn about top\-level bindings that are unused
.TP
.B \fI\%\-Wunused\-type\-patterns\fP
warn about unused type variables which arise from patterns
in type family and data family instances
.TP
.B \fI\%\-Wwarn\fP
make warnings non\-fatal
.TP
.B \fI\%\-Wwarnings\-deprecations\fP
warn about uses of functions & types that have warnings or
deprecated pragmas
.TP
.B \fI\%\-Wwrong\-do\-bind\fP
warn about do bindings that appear to throw away monadic values
that you should have bound instead
.UNINDENT
.SH COPYRIGHT
.sp
Copyright 2015. The University Court of the University of Glasgow.
All rights reserved.
.SH AUTHOR
The GHC Team
.SH COPYRIGHT
2015, GHC Team
.\" Generated by docutils manpage writer.
.
