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Latest commit 290def7 @quchen quchen committed with bgamari Implement warnings for Semigroups as parent of Monoid
This patch is similar to the AMP patch (#8004), which offered two

  1. Warn when an instance of a class has been given, but the type does
     not have a certain superclass instance
  2. Warn when top-level definitions conflict with future Prelude names

These warnings are issued as part of the new `-Wcompat` warning group.

Reviewers: hvr, ekmett, austin, bgamari

Reviewed By: hvr, ekmett, bgamari

Subscribers: ekmett, thomie

Differential Revision:

GHC Trac Issues: #11139
Failed to load latest commit information.
bindisttest Testsuite: suggest quoting $(TEST_HC)
compiler Implement warnings for Semigroups as parent of Monoid
distrib Libdw: Add libdw-based stack unwinding
docs Implement warnings for Semigroups as parent of Monoid
driver Implement function-sections for Haskell code, #8405
ghc ghci: Refactor handling of :show
includes base: Add Haskell interface to ExecutionStack
inplace Testsuite: suggest quoting $(TEST_HC)
libffi-tarballs @ b6658e5 Update libffi-tarballs submodule to libffi 3.1 (re #8701)
libffi Follow-up fix to 3e2a4ee (re #11109)
libraries Remove redundant `#if`s
mk Document meaning of WERROR
nofib @ a599585 Update nofib submodule again
rts LibdwPool: Use poolTryTake
rules Fix Windows builds after D1242
testsuite Implement warnings for Semigroups as parent of Monoid
utils Implement warnings for Semigroups as parent of Monoid
.arcconfig Fix .arcconfig
.arclint Fix broken .arclint
.gitignore docs: Ignore Sphinx doctrees produced by manpage build
.gitmodules Delete old-{time,locale} and haskell{98,2010}
.mailmap Update .mailmap [skip ci]
.travis.yml travis: use LLVM 3.7
ANNOUNCE Globally replace "" with "" Make configure error out on missing ghc-tarballs on Windows Move user's guide to ReStructuredText
LICENSE Reorganisation of the source tree Build system: implement `make install-strip` (#1851)
Makefile Always run explicitly requested ways (extra_ways) for fast runs. Move user's guide to ReStructuredText
Vagrantfile vagrant: move files around
aclocal.m4 Suppress conflicting types for builtins warnings
boot Build system: detect when user cloned from GitHub
config.guess Update config.{guess,sub} to GNU automake 1.14.1
config.sub Update config.{guess,sub} to GNU automake 1.14.1 Rip out Papi configure check Make install_docs rule sh-compatible
install-sh Update aux files `config.{guess,sub}` and `install-sh`
packages Remove all references to sync-all LlvmCodeGen cross-compiling fixes (#9895)
validate Rewrite checkUniques and incorporate into validate

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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