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Update Haskell package set to LTS 15.11 (plus other fixes) #86961

merged 14 commits into from May 8, 2020


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peti commented May 5, 2020

This PR is test-built by Hydra at I'll fix up the remaining errors and merge it on Friday, 2020-05-08 20:00 CET. You can watch this live on Twitch at In addition to the chat features offered by Twitch, there is also a voice conference at that viewers can use to chat with me and with each other.


  • Add ghcOptions flag to ghcWithPackages wrapper: #86948
  • Update all-cabal-hashes reference.
  • Split-out a minimal nix docker image: NixOS/docker#13
maralorn and others added 6 commits May 5, 2020
hlint 3.0 is shiny and new and is very picky in its dependencies.
Raise the maximum number of cores used for parallel building from 4 to 16.
Increase the size of the allocation area for GHC's garbage collector from 1 MiB
to 64 MiB.

See for the motivation for this change.
@peti peti force-pushed the haskell-updates branch from 33a27ef to 2a60d72 May 8, 2020
@peti peti merged commit effa374 into master May 8, 2020
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peti commented May 14, 2020

Next week, we'll merge #87805.

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expipiplus1 commented May 17, 2020

Hi @peti, ccb81f5 seems to have a very negative effect on building haskell packages on my machine. I frequently see loads of 100+, on a 8 core (16 virtual, Intel(R) Core(TM) i9-9900K CPU @ 3.60GHz) machine. I've not done any detailed benchmarking but this can't be good. Do you have a script I can run to generate some compile times on my machine?


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