Re: propagating inputs in ghc-* packages

[Eric Bavier <ericbavier@openmailbox.org>]

Hello Ricardo,

On 2016-09-30 04:24, Ricardo Wurmus wrote:
> Hi Guix,
> 
> I’m in the middle of upgrading our Haskell packages.  (Actually, I’m
> just yak shaving.  I need “pandoc-citeproc” for “r-knitr”…)
> 
> 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’m not sure we actually need to propagate 
> anything
> at all.  Could someone please confirm this?

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

-- 
`~Eric