[Haskell-cafe] Cabal install fails, don't understand why

[Henning Thielemann]

On Sat, 30 Mar 2024, Volker Wysk wrote:

> Am Freitag, dem 29.03.2024 um 13:48 -0400 schrieb Brandon Allbery:
>> 
>> Cabal and stack are designed around the notion of projects, defined by a
>> cabal file (or `package.yaml` if you use Hpack), `stack.yaml` for stack,
>> optional `cabal.project` for cabal. Projects are sandboxed such that the
>> package(s) in the project use consistent versions of all dependencies.
>> 
>> Neither tool handles use outside of a project well, although stack has a
>> global configuration (whose use for this is deprecated iirc) and cabal
>> uses ghc's environment files when requested. So something that isn't
>> really intended for use as part of a project isn't well handled by either
>> one.
>
> Sounds complicated. I guess the best way to avoid trouble, is to do
> everything in projects and avoid code outside of projects.

You can easily turn code outside of a project into code inside a project, 
by adding something to the 'packages' field in cabal.project or add a 
separate 'source-repository-package' entry in the cabal.project.

Or you stick to 'cabal v1-install'.