From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Bavier <ericbavier@openmailbox.org>
Subject: Re: propagating inputs in ghc-* packages
Date: Fri, 30 Sep 2016 09:37:15 -0500
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To: Ricardo Wurmus <rekado@elephly.net>
Cc: guix-devel <guix-devel@gnu.org>, Guix-devel <guix-devel-bounces+ericbavier=openmailbox.org@gnu.org>

Hello Ricardo,

On 2016-09-30 04:24, Ricardo Wurmus wrote:
> Hi Guix,
>=20
> I=E2=80=99m in the middle of upgrading our Haskell packages.  (Actually=
, I=E2=80=99m
> just yak shaving.  I need =E2=80=9Cpandoc-citeproc=E2=80=9D for =E2=80=9C=
r-knitr=E2=80=9D=E2=80=A6)
>=20
> I noticed that upgrading Haskell packages is a pain in the neck because
> of propagated inputs.  It seems that not all packages have fully
> declared dependencies and just work accidentally because of propagated
> inputs of a related package.  This also makes upgrades more difficult
> because I can get substitutes from Hydra that depend on older versions
> of some Haskell packages.
>=20
> It looks like Haskell binaries actually embed references to other
> Haskell packages, so I=E2=80=99m not sure we actually need to propagate=
=20
> anything
> at all.  Could someone please confirm this?

Commit e17d513381296b (from almost a year ago!) was intended to allow us=20
to remove propagated inputs from our ghc-* packages.  But I didn't=20
follow-up at the time, for reasons I forget now, in actually=20
un-propagating those inputs.  So if you want to try to do that, it might=20
just work.

--=20
`~Eric