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Latest commit 5b145c9 May 26, 2016 @osa1 osa1 Coverage.hs: Fix a duplication
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.arc-linters linters/check-cpp: Don't produce debug log Dec 7, 2015
bindisttest Rework CC/CC_STAGE0 handling in `` Apr 16, 2016
compiler Coverage.hs: Fix a duplication May 26, 2016
distrib Rework CC/CC_STAGE0 handling in `` Apr 16, 2016
docs Fix broken links to mdo papers May 25, 2016
driver Fix: #12084 deprecate old profiling flags May 24, 2016
ghc Greater customization of GHCi prompt May 1, 2016
includes rts: Add isPinnedByteArray# primop May 18, 2016
inplace Testsuite: suggest quoting $(TEST_HC) Oct 30, 2015
iserv Allow all RTS options to iserv Feb 3, 2016
libffi-tarballs @ ec37a68 Update libffi-tarballs submodule to libffi 3.1 (re #10238) Dec 8, 2015
libffi Build system: temp solution for parallelisation bug (#11960) May 22, 2016
libraries Testsuite: fix enum01/02/03 on Windows (#9399) May 25, 2016
mk Suppress the warning about __sync_fetch_and_nand (#9678) May 24, 2016
nofib @ 35fc121 Fix: #12084 deprecate old profiling flags May 24, 2016
rts RTS: simplify read_heap_profiling_flag May 25, 2016
rules users-guide: Fix index in PDF output May 21, 2016
testsuite Reduce special-casing for nullary unboxed tuple May 26, 2016
utils Add -XStaticPointers to the flag reference. May 19, 2016
.arcconfig Reenable external-json linters Mar 29, 2016
.arclint Reenable external-json linters Mar 29, 2016
.gitignore Add libraries/ghci/GNUmakefile to .gitignore [skip ci] May 19, 2016
.gitmodules Ignore untracked in nofib Feb 11, 2016
.mailmap Update .mailmap [skip ci] May 18, 2016
.travis.yml travis: use GHC 7.10.3 Dec 31, 2015
ANNOUNCE ANNOUNCE: Mention powerpc code generator Jan 15, 2016 Make configure error out on missing ghc-tarballs on Windows Jul 30, 2015 Mention -j and other wibbles Jan 14, 2016
LICENSE Reorganisation of the source tree Apr 7, 2006 Build system: implement `make install-strip` (#1851) Sep 4, 2015
Makefile Unset GREP_OPTIONS in build system Feb 9, 2016 Fix readme link to FixingBugs wiki page Mar 11, 2016
Vagrantfile vagrant: move files around Jul 20, 2014
aclocal.m4 Suppress the warning about __sync_fetch_and_nand (#9678) May 24, 2016
boot Unset GREP_OPTIONS in build system Feb 9, 2016
config.guess Update config.{guess,sub} to GNU automake 1.14.1 Sep 16, 2014
config.sub Update config.{guess,sub} to GNU automake 1.14.1 Sep 16, 2014 Set `USE_MMAP` at configure time May 17, 2016 Move Extension type to ghc-boot-th May 16, 2016
install-sh Update aux files `config.{guess,sub}` and `install-sh` Nov 8, 2013
packages Make random an "extra" package May 11, 2016 LlvmCodeGen cross-compiling fixes (#9895) Dec 29, 2014
validate validate: Note existence of config_args variable Apr 17, 2016

The Glasgow Haskell Compiler

Build Status

This is the source tree for GHC, a compiler and interactive environment for the Haskell functional programming language.

For more information, visit GHC's web site.

Information for developers of GHC can be found on the GHC Trac.

Getting the Source

There are two ways to get a source tree:

  1. Download source tarballs

    Download the GHC source distribution:


    which contains GHC itself and the "boot" libraries.

  2. Check out the source code from git

    $ git clone --recursive git://

    Note: cloning GHC from Github requires a special setup. See Getting a GHC repository from Github.

    DO NOT submit pull request directly to the github repo. See the GHC team's working conventions re how to contribute a patch to GHC.

Building & Installing

For full information on building GHC, see the GHC Building Guide. Here follows a summary - if you get into trouble, the Building Guide has all the answers.

Before building GHC you may need to install some other tools and libraries. See, Setting up your system for building GHC.

NB. In particular, you need GHC installed in order to build GHC, because the compiler is itself written in Haskell. You also need Happy, Alex, and Cabal. For instructions on how to port GHC to a new platform, see the GHC Building Guide.

For building library documentation, you'll need Haddock. To build the compiler documentation, you need Sphinx and Xelatex (only for PDF output).

Quick start: the following gives you a default build:

$ ./boot
$ ./configure
$ make         # can also say 'make -jX' for X number of jobs
$ make install

On Windows, you need an extra repository containing some build tools. These can be downloaded for you by configure. This only needs to be done once by running:

$ ./configure --enable-tarballs-autodownload

(NB: Do you have multiple cores? Be sure to tell that to make! This can save you hours of build time depending on your system configuration, and is almost always a win regardless of how many cores you have. As a simple rule, you should have about N+1 jobs, where N is the amount of cores you have.)

The ./boot step is only necessary if this is a tree checked out from git. For source distributions downloaded from GHC's web site, this step has already been performed.

These steps give you the default build, which includes everything optimised and built in various ways (eg. profiling libs are built). It can take a long time. To customise the build, see the file HACKING.

Filing bugs and feature requests

If you've encountered what you believe is a bug in GHC, or you'd like to propose a feature request, please let us know! Submit a ticket in our bug tracker and we'll be sure to look into it. Remember: Filing a bug is the best way to make sure your issue isn't lost over time, so please feel free.

If you're an active user of GHC, you may also be interested in joining the glasgow-haskell-users mailing list, where developers and GHC users discuss various topics and hang out.

Hacking & Developing GHC

Once you've filed a bug, maybe you'd like to fix it yourself? That would be great, and we'd surely love your company! If you're looking to hack on GHC, check out the guidelines in the file in this directory - they'll get you up to speed quickly.

Contributors & Acknowledgements

GHC in its current form wouldn't exist without the hard work of its many contributors. Over time, it has grown to include the efforts and research of many institutions, highly talented people, and groups from around the world. We'd like to thank them all, and invite you to join!

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