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

[Alan & Kim Zimmerman]

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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>
>
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