[Haskell-beginners] How to install new GHC ?

[David McBride]

You can see how to configure stack here:
https://github.com/commercialhaskell/stack/blob/release/doc/yaml_configuration.md

The short of it is that to have stack ghci choose a particular version of
ghc, you probably need to modify ~/.stack/global/stack.yaml, change
resolver to something here https://www.stackage.org/snapshots that has your
version of ghc and dependencies similar to what your project wants.  For
example 'nightly-2017-12-10'.

On Tue, Dec 12, 2017 at 7:53 AM, Baa <aquagnu at gmail.com> wrote:

> @Francesco: unfortunately nightly misses some package. So, I tried:
>
>   $ stack --resolver=ghc-8.2.2 setup --reinstall
>   Preparing to install GHC (tinfo6) to an isolated location. This will not
>   interfere with any system-level installation. Already downloaded.
>   Installed GHC.
>
>   stack will use a sandboxed GHC it installed
>   For more information on paths, see 'stack path' and 'stack exec env'
>   To use this GHC and packages outside of a project, consider using:
>   stack ghc, stack ghci, stack runghc, or stack exec
>
> So seems that 8.2.2 was installed, right? But how to build the project
> with new GHC now? I never used cabal before, `stack ghci` still runs
> 8.0.2 instead of 8.2.2. Installed GHC 8.2.2 does not correspond
> to .yaml file LTS - maybe this is a reason why old 8.0.2 is stil used...
>
> When I try cabal build/new-build/repl I get:
>
>   cabal: The program 'ghc' version >=6.4 is required but it could not be
>   found.
>
> So, cabal does not know about installed GHC versions (at least 8.0.2,
> used by stack). I tried --require-sandbox but without success.
>
>
> > On Tue, Dec 12, 2017 at 01:56:03PM +0200, Baa wrote:
> > > Would somebody explain me what is wrong here and how I can test a
> > > project with new 8.2.2 GHC?
> >
> > Hello Paul, I don't think stack lts has 8.2.2 just yet. Use a
> > nightly or download/install ghc from here and compile your project
> > with the new `cabal new-build`.
> >
> > [1] https://www.haskell.org/ghc/download_ghc_8_2_2.html#binaries
> >
> >
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