GNU bug report logs - #34227
Non-deterministic GHC build errors

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ludovic Courtès <ludo <at> gnu.org>
Subject: bug#34227: closed (Re: Non-deterministic GHC build errors)
Date: Sat, 21 Jan 2023 12:40:01 +0000

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Your bug report

#34227: Non-deterministic GHC build errors

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 34227 <at> debbugs.gnu.org.

-- 
34227: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34227
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Lars-Dominik Braun <lars <at> 6xq.net>
To: 34227-done <at> debbugs.gnu.org
Subject: Re: Non-deterministic GHC build errors
Date: Sat, 21 Jan 2023 13:39:18 +0100

None of these are actual errors, but warnings. I’ve built a ton of
Haskell packages and never encountered transient errors.

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Bug Guix <bug-guix <at> gnu.org>
Subject: Non-deterministic GHC build errors
Date: Sun, 27 Jan 2019 22:52:52 +0100

Hello,

I’ve noticed something really unexpected: take a Haskell package, say
‘ghc-libmpd’, build it several times (with --rounds or --check), and
notice that sometimes it will build successfully, and other times,
you’ll get a compiler error like this:

--8<---------------cut here---------------start------------->8---
Configuring libmpd-0.9.0.9...
phase `configure' succeeded after 0.9 seconds
starting phase `patch-generated-file-shebangs'
phase `patch-generated-file-shebangs' succeeded after 0.0 seconds
starting phase `build'
running "runhaskell Setup.hs" with command "build" and parameters ()
Preprocessing library for libmpd-0.9.0.9..
Building library for libmpd-0.9.0.9..
[ 1 of 36] Compiling Network.MPD.Core.Error ( src/Network/MPD/Core/Error.hs, dist/build/Network/MPD/Core/Error.o )

src/Network/MPD/Core/Error.hs:18:1: warning: [-Wdeprecations]
    Module ‘Control.Monad.Error’ is deprecated:
      Use "Control.Monad.Except" instead
   |
18 | import           Control.Monad.Error (Error(..))
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/Network/MPD/Core/Error.hs:48:10: warning: [-Wdeprecations]
    In the use of type constructor or class ‘Error’
    (imported from Control.Monad.Error, but defined in transformers-0.5.5.0:Control.Monad.Trans.Error):
    Deprecated: "Use Control.Monad.Trans.Except instead"
   |
48 | instance Error MPDError where
   |          ^^^^^

src/Network/MPD/Core/Error.hs:48:10: warning: [-Wdeprecations]
    In the use of type constructor or class ‘Error’
    (imported from Control.Monad.Error, but defined in transformers-0.5.5.0:Control.Monad.Trans.Error):
    Deprecated: "Use Control.Monad.Trans.Except instead"
   |
48 | instance Error MPDError where
   |          ^^^^^
[ 2 of 36] Compiling Network.MPD.Core.Class ( src/Network/MPD/Core/Class.hs, dist/build/Network/MPD/Core/Class.o )

src/Network/MPD/Core/Class.hs:17:1: warning: [-Wdeprecations]
    Module ‘Control.Monad.Error’ is deprecated:
      Use "Control.Monad.Except" instead
   |
17 | import           Control.Monad.Error (MonadError)
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ 3 of 36] Compiling Network.MPD.Util ( src/Network/MPD/Util.hs, dist/build/Network/MPD/Util.o )
--8<---------------cut here---------------end--------------->8---

That seems surreal to me.

Thoughts?

Ludo’.

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