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: ~/.stack/programs/x86_32-linux/ghc-nopie-8.2.1/lib/ghc-8.2.1/bin 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!