Hacking on GHC Has Never Been Easier
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Hacking on GHC Has Never Been Easier!
Posted on 22 June 2019
Tags:haskell, nix , programming
At ZuriHac 2019 Matthew Pickering talked about Tools for working on GHC . There’s an associated blog post which is also interesting.
I wanted to focus on a small part of his presentation, which is about loading GHC into GHCi
and using
ghcid
to automatically reload GHC on changes. This has been possible for almost a year now, thanks to work by Michael Sloan
.
Putting this together with
Alp Mestanogullari’s ghc.nix
, it’s now possible to provision a GHC development environment from scratch with just a few commands, assuming that you have nix-shell
, cabal-install
, and ghcid
installed. Here they are:
$ git clone --recursive https://gitlab.haskell.org/ghc/ghc/ $ cd ghc $ git clone https://github.com/alpmestan/ghc.nix $ cabal update $ nix-shell ghc.nix/ --run './boot && ./configure && ghcid'
This will take a while the first time, but ghcid
will cache generated artifacts under ./hadrian_ghci
so even quitting and reloading will be significantly faster.
Congratulations, you are now a GHC developer!
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