[Haskell-cafe] What is a good way to test library on several ghc's?

Alan & Kim Zimmerman alan.zimm at gmail.com
Mon Mar 13 08:34:37 UTC 2017

Once you have installed the various GHC compilers from HVR's PPA, you can do

cabal configure --with-compiler=ghc-7.10.3



On 13 March 2017 at 10:28, Ertugrul Söylemez <esz at posteo.de> wrote:

> > Someone asked to add support in my lib for older version of GHC.
> > I know that there are GHC-version specific pragmas to activate the
> > code on specific version.
> >
> > I'm not quite sure how to setup the environment to use several GHCs.
> > How do you do that kind of thing?
> You can do it quite easily with Nix (which you can use alongside your
> normal package manager without interference, if you're not on NixOS).
> Type in your package's root directory:
>     cabal2nix --shell > shell.nix
> Then you can build your package with various compiler versions:
>     nix-build shell.nix --argstr compiler ghc803
>     nix-build shell.nix --argstr compiler ghc7103
>     nix-build shell.nix --argstr compiler ghcjs
> If a build is successful, you will get a symlink called 'result', which
> points to an installed version if your package including documentation.
> Once you're done testing, just delete that link.
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