It also provides common infrastructure for building and distributing packages. It describes what a package is and how packages interact with the language. Stack vs CabalĬabal is the package description format for Haskell. After that, all package versions are fixed, determined upstream by Stackage's snapshot mechanism. When installing a new package, you don't choose which version to install, instead when starting a project using Stack, you choose which Stackage snapshot to use. Stackage uses the concept of 'snapshots', where all packages part of the same snapshot are meant to be compatible with each other. Stack is backed by the Stackage package system. To do this, it manages (and freezes) all your dependencies and the version of GHC being used for your project. Stack is a build system for Haskell that aims to give you extremely reproducible builds. We will be using GHC 7.10 throughout this course. Our motivation for recommending Stack is that we believe it is easier for beginners to work with, particularly as it manages the version of GHC used so that you aren't reliant on your OS package manager. This document tries to quickly explain the situation. You will see many references to Cabal and cabal-install on the Internet for Haskell projects. Building Haskell Projects Building Haskell Projectsįor this class, we recommend you use the new Stack Haskell build system.
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