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Upgrading packages/Updating to GHC 6.10

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A list of things that need updating when porting packages to newer library/cabal versions.

If you maintain a Haskell package this is for you. For older versions of this document:

Updating to GHC 6.10 and Cabal 1.6

When upgrading to GHC 6.10, any of your packages that worked against the base-3 library will continue to work. GHC 6.10 provides both the old base-3 library and the new base-4.

To ensure your old code continues to work, you can have the code compile and link against base-3, and then, over time, migrate code to the base-4 series.


1 Adding base-3 constraints

How to do this depends on how you build your Haskell code. We'll start with the most simplistic build mechanisms. cabal-install, the most sophisticated tool, will sort this all out for you anyway, so things should change.

1.1 ghc --make

Force use of package base-3 when using --make,

   ghc --make --package base-

1.2 runhaskell

If you build your packages with the 'runhaskell Setup.hs configure' method, then you can force the use of base-3,


1.3 cabal-install

No change required. Should it be necessary to override, use


2 Changes in base 4

  • Exceptions