[Haskell-cafe] Cabal problem, broken packages?

[Brandon Allbery]

xmonad uses `--lib` along with `--package-env` so its packages are
visible only to xmonad during mod-q rebuilds. This works well without
polluting the global package environment.

On Thu, Sep 15, 2022 at 12:38 PM Tom Ellis
<tom-lists-haskell-cafe-2017 at jaguarpaw.co.uk> wrote:
>
> On Thu, Sep 15, 2022 at 12:25:11PM -0400, Brandon Allbery wrote:
> > It looks good because you're using it the way you're supposed to
> > instead of blindly using --lib to install things. That creates
> > dependency issues like what you're having. Basically, don't use --lib
> > unless you know what you're doing.
>
> +1, although I'm yet to see evidence that anyone knows what
> they're doing with --lib.
>
> Unfortunately instructions like
>
>   This package can be installed using the Cabal package manager for
>   Haskell by issuing the following command:
>
>   cabal install QuickCheck
>
> are still prevalent around the web.  When the user tries he or she
> gets the response
>
>
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @ WARNING: Installation might not be completed as desired! @
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> The command "cabal install [TARGETS]" doesn't expose libraries.
> * You might have wanted to add them as dependencies to your package. In this
> case add "QuickCheck" to the build-depends field(s) of your package's .cabal
> file.
> * You might have wanted to add them to a GHC environment. In this case use
> "cabal install --lib QuickCheck". The "--lib" flag is provisional: see
> https://github.com/haskell/cabal/issues/6481 for more information.
>
>
> The next natural course of action is "cabal install --lib".
>
> Tom
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-- 
brandon s allbery kf8nh
allbery.b at gmail.com