>From 8c9728eb66a45fd42f208df66d323981837c9c0c Mon Sep 17 00:00:00 2001
From: Eric Brown <address@hidden>
Date: Mon, 10 Sep 2018 08:33:43 -0500
Subject: [PATCH] gnu: Add openblas-ilp64.

* gnu/packages/maths.scm (openblas-ilp64): New variable.
---
 gnu/packages/maths.scm | 71 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
index 01bd03c60..5f1dfec8a 100644
--- a/gnu/packages/maths.scm
+++ b/gnu/packages/maths.scm
@@ -27,6 +27,7 @@
 ;;; Copyright © 2018 Nadya Voronova <address@hidden>
 ;;; Copyright © 2018 Adam Massmann <address@hidden>
 ;;; Copyright © 2018 Marius Bakke <address@hidden>
+;;; Copyright © 2018 Eric Brown <address@hidden>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -2909,6 +2910,76 @@ parts of it.")
      "OpenBLAS is a BLAS library forked from the GotoBLAS2-1.13 BSD version.")
     (license license:bsd-3)))
 
+(define-public openblas-ilp64
+  (package
+    (name "openblas-ilp64")
+    (version "0.3.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "mirror://sourceforge/openblas/v" version "/OpenBLAS%20"
+                           version "%20version.tar.gz"))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0b20km2jv7m6qiylrlvhq2vnmkmilb633mr8rhqmgbn1wqrp58jq"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:test-target "test"
+       ;; DYNAMIC_ARCH is only supported on x86.  When it is disabled and no
+       ;; TARGET is specified, OpenBLAS will tune itself to the build host, so
+       ;; we need to disable substitutions.
+       #:substitutable?
+        ,(let ((system (or (%current-target-system) (%current-system))))
+           (or (string-prefix? "x86_64" system)
+               (string-prefix? "i686" system)
+               (string-prefix? "mips" system)
+               (string-prefix? "aarch64" system)))
+       #:make-flags
+       (list (string-append "PREFIX=" (assoc-ref %outputs "out"))
+             "SHELL=bash"
+             ;; Build the library for all supported CPUs.  This allows
+             ;; switching CPU targets at runtime with the environment variable
+             ;; OPENBLAS_CORETYPE=<type>, where "type" is a supported CPU type.
+             ;; Unfortunately, this is not supported on non-x86 architectures,
+             ;; where it leads to failed builds.
+             ,@(let ((system (or (%current-target-system) (%current-system))))
+                 (cond
+                  ((or (string-prefix? "x86_64" system)
+                       (string-prefix? "i686" system))
+                   '("DYNAMIC_ARCH=1" "INTERFACE64=1" "LIBNAMESUFFIX=ilp64"))
+                  ;; On MIPS we force the "SICORTEX" TARGET, as for the other
+                  ;; two available MIPS targets special extended instructions
+                  ;; for Loongson cores are used.
+                  ((string-prefix? "mips" system)
+                   '("TARGET=SICORTEX" "INTERFACE64=1" "LIBNAMESUFFIX=ilp64"))
+                  ;; On aarch64 force the generic 'armv8-a' target
+                  ((string-prefix? "aarch64" system)
+                   '("TARGET=ARMV8" "INTERFACE64=1" "LIBNAMESUFFIX=ilp64"))
+                  (else '("INTERFACE64=1" "LIBNAMESUFFIX=ilp64")))))
+       ;; no configure script
+       #:phases
+       (modify-phases %standard-phases
+         (delete 'configure)
+         (add-before 'build 'set-extralib
+           (lambda* (#:key inputs #:allow-other-keys)
+             ;; Get libgfortran found when building in utest.
+             (setenv "FEXTRALIB"
+                     (string-append "-L" (assoc-ref inputs "fortran-lib")
+                                    "/lib"))
+             #t)))))
+    (inputs
+     `(("fortran-lib" ,gfortran "lib")))
+    (native-inputs
+     `(("cunit" ,cunit)
+       ("fortran" ,gfortran)
+       ("perl" ,perl)))
+    (home-page "http://www.openblas.net/")
+    (synopsis "Optimized BLAS library based on GotoBLAS (ILP64 version)")
+    (description
+     "OpenBLAS is a BLAS library forked from the GotoBLAS2-1.13 BSD version. (ILP64 version)")
+    (license license:bsd-3)))
+
 (define* (make-blis implementation #:optional substitutable?)
   "Return a BLIS package with the given IMPLEMENTATION (see config/ in the
 source tree for a list of implementations.)
-- 
2.18.0