[Haskell-beginners] How to install new GHC ?
aquagnu at gmail.com
Tue Dec 12 13:38:30 UTC 2017
1. GHC 8.2.2 is here:
3. yes, it's 8.2.2
4. `cabal new-build` said to me call `cabal update`, I done it, then run
it again and got:
$ cabal new-build
cabal: Could not resolve dependencies:
trying: XXX-0.5.0.0 (user goal)
next goal: YYY-utils (dependency of XXX-0.5.0.0)
Dependency tree exhaustively searched.
> On Tue, Dec 12, 2017 at 02:53:47PM +0200, Baa 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.
> Hey Paul,
> four-step plan:
> 1. check where stack installed ghc, it should be something like:
> 2. add these two lines to your `~/.bashrc`:
> export PATH=~/.cabal/bin:$PATH # path to stuff built with cabal
> export PATH=~/the.stackpathabove:$PATH # path to ghc
> 3. check the right ghc version has been selected:
> ghc -v
> # should be 8.2.2
> 4. cd into your project and `cabal new-build` and then open a repl on
> it with `cabal new-repl`.
> Let us know if this works!
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