Mirror of the Glasgow Haskell Compiler. Please submit issues and patches to GHC's Gitlab instance (https://gitlab.haskell.org/ghc/ghc). First time contributors are encouraged to get started with the newcomers info (https://gitlab.haskell.org/ghc/ghc/wikis/contributing).
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 issue tracker.
There are two ways to get a source tree:
Download source tarballs
Download the GHC source distribution:
which contains GHC itself and the "boot" libraries.
Check out the source code from git
$ git clone --recurse-submodules [email protected]:ghc/ghc.git
Note: cloning GHC from Github requires a special setup. See Getting a GHC repository from Github.
See the GHC team's working conventions regarding how to contribute a patch to GHC. First time contributors are encouraged to get started by just sending a Merge Request.
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.
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
Nis the amount of cores you have.)
./bootstep 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
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 an issue 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.
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
HACKING.mdfile in this directory - they'll get you up to speed quickly.
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!