[Haskell-cafe] Info on dependencies among libs distributed with ghc?

Joachim Breitner mail at joachim-breitner.de
Mon Apr 21 12:10:42 UTC 2014


Am Montag, den 21.04.2014, 11:38 +0200 schrieb Magnus Therning:
> Then I have to say it is rather irritating that there is no way for me
> to safely provide the latest version of cabal-install!

the same problem affects Debian, and I find it equally irritating. Not
sure how Fedora handles this – Jens, did you find a problem around this?

One possibility would be to manually bundle the Cabal and cabal-install
sources into one (dpkg supports source packages with multiple original
tarballs), build the new Cabal just to be used to build cabal-install
and link that statically (which is the default). This would provide an
up-to-date cabal-install binary without having to ship a new Cabal
version as a library. Or does cabal-install require the matching version
of Cabal to be registered to work?

Alternatively it might be possible to build ghc with a newer Cabal. Not
sure what that might break.

I believe there was talk to avoid having ghc depend on Cabal (it uses
very little of it anyways), and indeed, there is
but work got stalled 7 months ago. Fixing tht  would solve the problems
for us distributions – maybe someone wants to pick up the work?


PS: https://ghc.haskell.org/trac/ghc/ticket/8947 is a related bug
(though about ghc’s dependency on binary, not on Cabal).

Joachim “nomeata” Breitner
  mail at joachim-breitner.dehttp://www.joachim-breitner.de/
  Jabber: nomeata at joachim-breitner.de  • GPG-Key: 0xF0FBF51F
  Debian Developer: nomeata at debian.org

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