Skip to content
This repository


Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP

Mirror of ghc repository. DO NOT SUBMIT PULL REQUESTS HERE. Patches are best submitted to GHC's Trac ( or sent to the mailing list (

branch: ghc-lwc2

This branch is 110 commits ahead and 7717 commits behind master

Octocat-spinner-32 bindisttest Rename $(Windows) to $(Windows_Host)
Octocat-spinner-32 compiler Merging master
Octocat-spinner-32 distrib Detect linker information at runtime. Fixes Trac #6063
Octocat-spinner-32 docs Release notes: mention -XEmptyCase
Octocat-spinner-32 driver Remove fglasgow-exts from ghci --help
Octocat-spinner-32 ghc Document remaining GHCi commands in users_guide (#7501)
Octocat-spinner-32 includes Pulling changes from head
Octocat-spinner-32 libffi Move libffi's tarball into its own repo
Octocat-spinner-32 libraries Fixes links to random and vector libraries
Octocat-spinner-32 mk Implement the AMP warning (#8004)
Octocat-spinner-32 rts Removes tabs from tab-free files.
Octocat-spinner-32 rules Comment fix
Octocat-spinner-32 tests Removes tabs from tab-free files.
Octocat-spinner-32 utils Pulling changes from head
Octocat-spinner-32 .gitignore Pulling changes from head
Octocat-spinner-32 .gitmodules Replace occurences of by
Octocat-spinner-32 ANNOUNCE Merging with master
Octocat-spinner-32 Fix typo
Octocat-spinner-32 LICENSE Reorganisation of the source tree
Octocat-spinner-32 MAKEHELP Remove html, pdf and ps from the list of targets in MAKEHELP
Octocat-spinner-32 Makefile Add an echo target to the build system
Octocat-spinner-32 Whitespace change to test Trac/Gitolite.
Octocat-spinner-32 SUBMAKEHELP Make the "show" target work anywhere in the build tree
Octocat-spinner-32 aclocal.m4 Restore old names of comparison primops
Octocat-spinner-32 boot Extend `packages` by 4th column for upstream repo
Octocat-spinner-32 config.guess add support for ARM hard-float ABI (fixes #5914)
Octocat-spinner-32 config.sub Update config.guess, config.sub and from automake-1.10.2
Octocat-spinner-32 Make sure -fcmm-sink is passed to Parser properly
Octocat-spinner-32 Pulling changes from head
Octocat-spinner-32 install-sh Mark scripts executable (boot, and the ones the build system chmods)
Octocat-spinner-32 packages Merging master
Octocat-spinner-32 Rework how iOS does linking (#8127)
Octocat-spinner-32 sync-all Update library refs
Octocat-spinner-32 tarballs Add tarball syncing to darcs-all
Octocat-spinner-32 validate Pulling changes from head

The Glasgow Haskell Compiler

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

    First clone the GHC github read-only repository:

      $ git clone git://

    Then run the sync-all script in that repository to get the other repositories:

      $ cd ghc
      $ ./sync-all get

    This checks out the "boot" packages.

    DO NOT submit pull request directly to the github repo. See the GHC developer team's working conventions re contributing patches.

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 a good DocBook XML toolchain and dblatex.

Quick start: the following gives you a default build:

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

(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 perl 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.

Once you have a build you need to keep it going. You need to keep all repos in sync with the sync-all script. To get the latest changes:

$ ./sync-all pull
$ ./sync-all get

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!

Something went wrong with that request. Please try again.