# Upgrading packages/Updating to GHC 6.10

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If you maintain a Haskell package this is for you. | If you maintain a Haskell package this is for you. | ||

− | |||

For older versions of this document: | For older versions of this document: | ||

* [[/Updating to GHC 6.8]] | * [[/Updating to GHC 6.8]] | ||

− | + | '''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. | ||

− | === cabal-install=== | + | == 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. | ||

+ | |||

+ | === ghc --make === | ||

+ | |||

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

+ | |||

+ | ghc --make --package base-3.0.3.0 | ||

===runhaskell === | ===runhaskell === | ||

− | + | If you build your packages with the 'runhaskell Setup.hs configure' | |

− | + | method, then you can force the use of base-3, | |

+ | |||

+ | --constraint="base<4" | ||

+ | |||

+ | === cabal-install=== | ||

+ | |||

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

+ | |||

+ | --constraint="base<4" | ||

− | + | == Changes in base 4 == | |

+ | * Exceptions | ||

[[Category:Libraries]] | [[Category:Libraries]] |

## Revision as of 04:06, 9 October 2008

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.

## Contents |

## 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-3.0.3.0

### 1.2 runhaskell

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

--constraint="base<4"

### 1.3 cabal-install

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

--constraint="base<4"

## 2 Changes in base 4

- Exceptions