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

[Adam Bergmark]

There are a bunch of compat libraries such as base-compat and
transformers-compat that will make your life a lot easier, having to
maintain CPP yourself is very error prone.

HTH,
Adam


On Mon, 13 Mar 2017 at 09:41 Alan & Kim Zimmerman <alan.zimm at gmail.com>
wrote:

> See also https://github.com/edsko/ghc-dump-tree/blob/master/buildall.sh
>
> On 13 March 2017 at 10:34, Alan & Kim Zimmerman <alan.zimm at gmail.com>
> wrote:
>
> Once you have installed the various GHC compilers from HVR's PPA, you can
> do
>
> cabal configure --with-compiler=ghc-7.10.3
>
> etc
>
> Alan
>
> 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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