[Haskell-cafe] Cabal problem, broken packages?

[Brandon Allbery]

The hex ID is an ABI hash. It is included for libraries installed by
cabal, but not those that ship with ghc itself.

On Thu, Sep 15, 2022 at 12:27 PM Volker Wysk <post at volker-wysk.de> wrote:
>
> Am Donnerstag, dem 15.09.2022 um 17:17 +0100 schrieb Tom Ellis:
> > On Thu, Sep 15, 2022 at 06:11:55PM +0200, Volker Wysk wrote:
> > > Am Donnerstag, dem 15.09.2022 um 16:31 +0100 schrieb Tom Ellis:
> > > > On Thu, Sep 15, 2022 at 05:23:10PM +0200, Volker Wysk wrote:
> > > > > I've lately set up the Haskell environment on my Linux box, with no
> > > > > problems. Then I have installed some packages with "cabal install", again
> > > > > without problems. But now I'm trying to install another package and I get a
> > > > > dependency conflict. It doesn't seem to matter which package I try to
> > > > > install:
> > > >
> > > > This is quite weird, because neither directory nor ghc are
> > > > dependencies of rfc5051.
> > > >
> > > > As a first step, can you try the following and report back whether you
> > > > successfully get to a GHCi a prompt?
> > > >
> > > > $ cabal repl -z --build-depends rfc5051
> > >
> > > This results in:
> > >
> > >
> > > desktop ~ $ cabal repl -z --build-depends rfc5051
> > > Resolving dependencies...
> > > Build profile: -w ghc-8.8.4 -O1
> > > In order, the following will be built (use -v for more details):
> > >  - rfc5051-0.2 (lib) (requires download & build)
> > >  - fake-package-0 (lib) (first run)
> > > Downloading  rfc5051-0.2
> > > Downloaded   rfc5051-0.2
> > > Starting     rfc5051-0.2 (lib)
> > > Building     rfc5051-0.2 (lib)
> > > Installing   rfc5051-0.2 (lib)
> > > Completed    rfc5051-0.2 (lib)
> > > Configuring library for fake-package-0..
> > > Preprocessing library for fake-package-0..
> > > Warning: No exposed modules
> > > GHCi, version 8.8.4: https://www.haskell.org/ghc/  :? for help
> > > Loaded GHCi configuration from /tmp/cabal-repl.-17863/setcwd.ghci
> > > Prelude>
> > >
> > >
> > > Looks good, doesn't it..?
> >
> > Yes, so this means that the problem is indeed the
> > ~/.ghc/x86_64-linux-8.8.4/environments/default that Mikolaj predicted
> > and you confirmed in a sibling thread.
>
> For reference, here's the beginning of that file again:
>
>
> clear-package-db
> global-package-db
> package-db /home/v/.cabal/store/ghc-8.8.4/package.db
> package-id ghc-8.8.4
> package-id bytestring-0.10.10.1
> package-id unix-2.7.3-
> f9e049162269c42fac796ce2193bc96fb95dfe3ac975de03338213cf0e37a14a
> package-id base-4.13.0.0
> ...
>
>
> What makes me wonder is, that some but not all "package-id" entries have a
> large hexadecimal string at the end of the line...
>
> >
> > I'm not sure what the suggested fix is.  I find this part of the cabal
> > command line API extremely inscrutable.
>
> Bye
> Volker
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-- 
brandon s allbery kf8nh
allbery.b at gmail.com