On 24 April 2015 at 13:52, SP
On 24/04/15 12:41, Magnus Therning wrote:
~~~ % sudo pacman -Rncs ghc % sudo pacman -S haskell-{unixutils,aeson,ansi-wl-pprint,mtl,optparse-applicative,safe,stringsearch,tar,utf8-string,zlib} % ./Setup.hs configure % ./Setup.hs build ~~~
Good, on my way to doing that too, that isn't the problem. Clearly I somehow managed to mess the local repository here. As I said it happens a lot because of some networking/security related issues with this machine.
But the question is, what happens is someone (unnecessarily/accidentally) manages to reinstall ghc? Is the whole set of haskell-* packages then unusable? Cause that seemed to be the effect it had on me.
This is the issue I was trying to discuss here. Can you see what happens if you reinstall ghc?
Ah :) If I re-install ghc all information about installed packages is lost, on the ghc-level, and when I try to re-install e.g. `haskell-unixutils` I get the same kind of error you were seeing. The root cause is that we use a mix of package management, `pacman` keeps track of distro-level packages, and `ghc-pkg` keeps track of the ghc level. When re-installing ghc these two databases aren't in sync anymore and using `pacman` to install results in errors on the `ghc-pkg` level. Basically, `pacman` won't re-install all dependencies, since they are already installed, but when registering with `ghc-pkg` it has no records of those dependencies. /M -- Magnus Therning OpenPGP: 0xAB4DFBA4 email: magnus@therning.org jabber: magnus@therning.org twitter: magthe http://therning.org/magnus