From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ricardo Wurmus <rekado@elephly.net>
Subject: bug#33922: failing git-annex build
Date: Sun, 30 Dec 2018 12:36:59 +0100
Message-ID: <87bm53gs9w.fsf@elephly.net>
References: <87h8evvjr2.fsf@kyleam.com>
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To: Kyle Meyer <kyle@kyleam.com>
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Hi Kyle,

> I'm seeing the failure below when trying to build git-annex.  Can anyone
> else reproduce this failure?  Any ideas how to resolve it?
>
> --8<---------------cut here---------------start------------->8---
> % git describe
> v0.16.0-400-g4f36d98f7b
>
> % ./pre-inst-env guix build -K --check git-annex
> Utility/Exception.hs:29:1: error:
>     Bad interface file: /gnu/store/qb3knv1h536sdjqc4nfkm3j1l8n7q87a-ghc-e=
xceptions-0.10.0/lib/ghc-8.4.3/exceptions-0.10.0/Control/Monad/Catch.dyn_hi
>         Something is amiss; requested module  exceptions-0.10.0:Control.M=
onad.Catch differs from name found in the interface file exceptions-0.10.0:=
Control.Monad.Catch (if these names look the same, try again with -dppr-deb=
ug)
>    |
> 29 | import Control.Monad.Catch as X hiding (Handler)
>    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

It seems to me that this is a more general problem affecting all of our
Haskell packages.  The configure phase that you didn=E2=80=99t paste should=
 show
that modules are provided by slightly different packages.

The haskell-build-system suffers from non-determinism.  It might just be
limited to the package database files that are generated by ghc-pkg
(where readdir is used and the result isn=E2=80=99t sorted).

I=E2=80=99m opening a bug report for this issue.

--=20
Ricardo