From mboxrd@z Thu Jan  1 00:00:00 1970
From: Federico Beffa <beffa@ieee.org>
Subject: propagating inputs in ghc-* packages
Date: Fri, 30 Sep 2016 23:07:47 +0200
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To: rekado@elephly.net
Cc: Guix-devel <guix-devel@gnu.org>

Ricardo Wurmus <rekado@elephly.net> writes:

> Hi Guix,
>
> 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)
>
> 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.
>
> It looks like Haskell binaries actually embed references to other
> Haskell packages, so I=E2=80=99m not sure we actually need to propagate a=
nything
> at all.  Could someone please confirm this?

>From what I recall, binary executables include references to packages,
but libraries do not.  So, at least at the time I wrote the first
version of the haskell-build-system, propagated inputs seemed to be
necessary for packages providing libraries, but not for ones providing
applications.

Regards,
Fede