Changes/GHC 7.8

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GHC 7.8


Update the ghc Haskell compiler to new 7.8 release, and update/rebuild all Haskell packages against it.


Current status

  • Targeted release: Fedora 21
  • Last updated: 2014-03-05
  • Tracker bug: <will be assigned by the Wrangler>

Detailed Description

The involves updating ghc from 7.6.3 to 7.8.1 (or later), and rebuilding/updating all Fedora Haskell packages. The initial work will be done offline locally to make sure that it is possible to build all our packages with ghc-7.8 and latest libraries. Once that is completed, building will be done into Koji for rawhide and testing done.

Benefit to Fedora

GHC 7.8 is major new version of the major Haskell compiler with many new features and enhancements.

For example the new runtime I/O manager scales significantly better for larger workloads compared to the previous one: it should scale linearly up to approximately 32 cores (reference). See the release notes link for more details.


  • Proposal owners:
    • locally test rebuilding and updating of all packages
    • update macros to subpackage static libraries
    • push changes to Koji
    • testing
  • Other developers: N/A (not a System Wide Change)
  • Release engineering: N/A (not a System Wide Change)
  • Policies and guidelines: N/A (not a System Wide Change)

Upgrade/compatibility impact

N/A (not a System Wide Change)

How To Test

N/A (not a System Wide Change)

User Experience

N/A (not a System Wide Change)


There are a few packages outside the Haskell SIG that use ghc for some part of their build. Assistance can be provided if needed to build them with latest ghc.

Contingency Plan

  • Contingency mechanism: (What to do? Who will do it?) N/A (not a System Wide Change)
  • Contingency deadline: N/A (not a System Wide Change)
  • Blocks release? N/A (not a System Wide Change), Yes/No
  • Blocks product? product <-- Applicable for Changes that blocks specific product release/ -->


Release Notes