# 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. |
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− | |||

For older versions of this document: |
For older versions of this document: |
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* [[/Updating to GHC 6.8]] |
* [[/Updating to GHC 6.8]] |
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− | == Updating to GHC 6.10 and Cabal 1.6 == |
+ | '''Updating to GHC 6.10 and Cabal 1.6''' |

− | Main changes: |
+ | 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 |
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+ | base-3 library and the new base-4. |
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− | * base-3 '''and''' base-4 will be installed, meaning you can always |
+ | To ensure your old code continues to work, you can have the code compile |

− | force packages to build against the old base. |
+ | and link against base-3, and then, over time, migrate code to the base-4 |

+ | series. |
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− | === cabal-install=== |
+ | == Adding base-3 constraints == |

+ | |||

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

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

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

+ | ghc --make --package base-3.0.3.0 |
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===runhaskell === |
===runhaskell === |
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− | Packages that require base-3 (e.g. for old implementations of the |
+ | If you build your packages with the 'runhaskell Setup.hs configure' |

− | exceptoin type, can be built using runhaskell Setup.hs with: |
+ | method, then you can force the use of base-3, |

+ | |||

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

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

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

+ | --constraint="base<4" |
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− | --constraint="base==3.*" |
+ | == Changes in base 4 == |

+ | * Exceptions |
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[[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