[Numeric] Getting blas-ffi to build under nix

[dominic at steinitz.org]

I thought I would broaden out the discussion Henning and I have been having.

I have managed to get http://hackage.haskell.org/package/blas-ffi <http://hackage.haskell.org/package/blas-ffi> to build under nix. Ideally we would like cabal2nix to do this automatically for us. We can do this if

We use openblas rather than blas.
Replace `PkgConfig-Depends: blas` with `PkgConfig-Depends: lapack (as the lapack derivation in nix generates a blas.pc) in the cabal file.
Fix nix to generate .pc files for blas - I don’t know the consequences of doing this but I can’t see any downside.

Does anyone have any views on what might be the best approach?

Dominic Steinitz
dominic at steinitz.org
http://idontgetoutmuch.org
Twitter: @idontgetoutmuch

> Begin forwarded message:
> 
> From: dominic at steinitz.org
> Subject: Getting blas-ffi to build under nix
> Date: 28 August 2019 at 13:31:45 BST
> To: Henning Thielemann <lemming at henning-thielemann.de>
> 
> Hi Henning,
> 
> I think there are 3 options (in nix - they may not work elsewhere)
> 
> Use openblas rather than blas
> Replace `PkgConfig-Depends: blas` with `PkgConfig-Depends: lapack`
> Fix nix to generate .pc files for blas (it does this for openblas and lapack, the latter also generates a blas.pc file
> 
> I don’t have a strong preference but I think I’d go for using openblas. I can send a patch but of course it’s a 1 line change so maybe you could just do it yourself and release a new version to hackage?
> 
> Dominic Steinitz
> dominic at steinitz.org <mailto:dominic at steinitz.org>
> http://idontgetoutmuch.org <http://idontgetoutmuch.org/>
> Twitter: @idontgetoutmuch
> 
> 
> 
> 

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