Commits on Apr 17, 2020

1. lapack: enable shared libraries, cblas, and tests

   

   matthewbauer committed Apr 17, 2020
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2. blas/lapack: add wrapper for “alternative”s of BLAS/LAPACK provider …

   This is based on previous work for switching between BLAS and LAPACK
   implementation in Debian[1] and Gentoo[2]. The goal is to have one way
   to depend on the BLAS/LAPACK libraries that all packages must use. The
   attrs “blas” and “lapack” are used to represent a wrapped BLAS/LAPACK
   provider. Derivations that don’t care how BLAS and LAPACK are
   implemented can just use blas and lapack directly. If you do care what
   you get (perhaps for some CPP), you should verify that blas and lapack
   match what you expect with an assertion.
   
   The “blas” package collides with the old “blas” reference
   implementation. This has been renamed to “blas-reference”. In
   addition, “lapack-reference” is also included, corresponding to
   “liblapack” from Netlib.org.
   
   Currently, there are 3 providers of the BLAS and LAPACK interfaces:
   
   - lapack-reference: the BLAS/LAPACK implementation maintained by netlib.org
   - OpenBLAS: an optimized version of BLAS and LAPACK
   - MKL: Intel’s unfree but highly optimized BLAS/LAPACK implementation
   
   By default, the above implementations all use the “LP64” BLAS and
   LAPACK ABI. This corresponds to “openblasCompat” and is the safest way
   to use BLAS/LAPACK. You may received some benefits from “ILP64” or
   8-byte integer BLAS at the expense of breaking compatibility with some
   packages.
   
   This can be switched at build time with an override like:
   
       import <nixpkgs> {
           config.allowUnfree = true;
           overlays = [(self: super: {
             lapack = super.lapack.override {
               lapackProvider = super.lapack-reference;
             };
             blas = super.blas.override {
               blasProvider = super.lapack-reference;
             };
           })];
         }
   
   or, switched at runtime via LD_LIBRARY_PATH like:
   
       $ LD_LIBRARY_PATH=$(nix-build -E '(with import <nixpkgs> {}).lapack.override { lapackProvider = pkgs.mkl; is64bit = true; })')/lib:$(nix-build -E '(with import <nixpkgs> {}).blas.override { blasProvider = pkgs.mkl; is64bit = true; })')/lib ./your-blas-linked-binary
   
   By default, we use OpenBLAS LP64 also known in Nixpkgs as
   openblasCompat.
   
   [1]: https://wiki.debian.org/DebianScience/LinearAlgebraLibraries
   [2]: https://wiki.gentoo.org/wiki/Blas-lapack-switch

   

   matthewbauer committed Apr 17, 2020
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3. treewide: use blas and lapack …

   This makes packages use lapack and blas, which can wrap different
   BLAS/LAPACK implementations.
   
   treewide: cleanup from blas/lapack changes
   
   A few issues in the original treewide:
   
   - can’t assume blas64 is a bool
   - unused commented code

   

   matthewbauer committed Apr 17, 2020
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4. pkgs/release-alternatives.nix: create …

   Add some ability to test the different BLAS/LAPACK implementations
   together.

   

   matthewbauer committed Apr 17, 2020
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5. setup-hooks/audit-blas.sh: init …

   Add a simple hook that makes sure blas and lapack are linked to the
   right place.

   

   matthewbauer committed Apr 17, 2020
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6. arrayfire: remove mkl …

   This is unfree.

   

   matthewbauer committed Apr 17, 2020
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7. scs: breaks on 64bit blas

   

   matthewbauer committed Apr 17, 2020
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8. giac: broken on 64-bit blas

   

   matthewbauer committed Apr 17, 2020
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9. Merge pull request #83888 from matthewbauer/blas-alternatives …

   Add BLAS/LAPACK switching mechanism

   

   Ericson2314 committed Apr 17, 2020
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