GNU bug report logs - #37064
Ghc 8.6.5 fails to find core package database

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Gabriel Giamarchi <gabrielg <at> student.ethz.ch>
Subject: bug#37064: closed (Re: bug#37064: Ghc 8.6.5 fails to find core
 package database)
Date: Tue, 10 Sep 2019 02:06:03 +0000

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Your bug report

#37064: Ghc 8.6.5 fails to find core package database

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 37064 <at> debbugs.gnu.org.

-- 
37064: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=37064
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Timothy Sample <samplet <at> ngyro.com>
To: Gabriel Giamarchi <gabrielg <at> student.ethz.ch>
Cc: 37064-done <at> debbugs.gnu.org
Subject: Re: bug#37064: Ghc 8.6.5 fails to find core package database
Date: Mon, 09 Sep 2019 22:05:43 -0400

Hi again,

Timothy Sample <samplet <at> ngyro.com> writes:

> Gabriel Giamarchi <gabrielg <at> student.ethz.ch> writes:
>
>> Installing only 'ghc 8.6.5' (Glasgow Haskell compiler) and sourcing
>>
>> '~/.guix-profile/etc/profile' leads to ghc not finding core modules.
>> ('ghci' doesn't find System.IO for instance).
>>
>> This is due to $GHC_PACKAGE_PATH not containing ghc 8.6.5's
>> package.conf.d, but
>> instead ghc 8.4.3's database.
>>
>> Note: Not setting this variable leads to a working ghc (will search in
>> default
>> location), but is required to install additional packages via guix.
>>
>> The issue might come from guix/profiles.scm:812, since
>>   (module-ref (resolve-interface '(gnu packages haskell)) 'ghc)
>> evaluates to <package ghc <at> 8.4.3 gnu/packages/haskell.scm:445> in my repl.
>
> Good catch.  I can confirm this is the issue, but I’m not sure how to
> fix it.  We could try to find GHC from the profile rather than
> unconditionally using a certain package.  However, that would not help
> if someone were to install GHC 8.4 and 8.6 in the same profile.

I took another look at this and we were wrong!  The main issue here is
that I made a mistake in the GHC 8.6 package definition, and it was
setting GHC_PACKAGE_PATH incorrectly.  This should be fixed as of commit
83aa656217.  Sorry for the trouble.

Note that you will likely run into trouble trying to use other
Guix-provided Haskell packages with GHC 8.6, as they are all built with
GHC 8.4.  AFAIU, this is not something that GHC supports.


-- Tim

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From: Gabriel Giamarchi <gabrielg <at> student.ethz.ch>
To: <bug-guix <at> gnu.org>
Subject: Ghc 8.6.5 fails to find core package database
Date: Sat, 17 Aug 2019 17:21:08 +0200

Installing only 'ghc 8.6.5' (Glasgow Haskell compiler) and sourcing

'~/.guix-profile/etc/profile' leads to ghc not finding core modules.
('ghci' doesn't find System.IO for instance).

This is due to $GHC_PACKAGE_PATH not containing ghc 8.6.5's 
package.conf.d, but
instead ghc 8.4.3's database.
Note: Not setting this variable leads to a working ghc (will search in 
default
location), but is required to install additional packages via guix.

The issue might come from guix/profiles.scm:812, since
  (module-ref (resolve-interface '(gnu packages haskell)) 'ghc)
evaluates to <package ghc <at> 8.4.3 gnu/packages/haskell.scm:445> in my repl.

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