[Haskell-cafe] Integer representation

David Feuer david.feuer at gmail.com
Thu Apr 19 20:05:29 UTC 2018

I'm not familiar with automatic cabal flags. Could you point me to

On Thu, Apr 19, 2018 at 3:01 PM, Claude Heiland-Allen
<claude at mathr.co.uk> wrote:
> Hi David,
> On 19/04/18 18:13, David Feuer wrote:
>> Is there any way to determine whether Integer comes from integer-gmp
>> or integer-simple? I'm playing with the idea of using the underlying
>> representation to get more compact/efficient tries, but I need to be
>> able to find out what that representation is.
> One way could be to use an automatic cabal flag.  With it enabled,
> depend on integer-gmp and add hs-source-dirs to a directory containing
> your integer-gmp implementation, with it disabled, depend on
> integer-simple and add hs-source dirs to a directory containing your
> integer-simple implementation.  This gives module-level control.  With
> automatic flag I think cabal will try both and choose the setting that
> gives the best build plan (likely corresponding to the Integer
> implementation of your ghc).
> Claude
> --
> https://mathr.co.uk
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