Merge branch 'master' into staging

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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Fis Trivial <ybbs.daans@hotmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages opencl)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix build-system cmake)
+  #:use-module (guix download)
+  #:use-module (guix git-download)
+  #:use-module (guix packages)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (gnu packages python))
+
+;; This file adds OpenCL implementation related packages. Due to the fact that
+;; OpenCL devices are not available during build (store environment), tests are
+;; all disabled.
+;; Check https://lists.gnu.org/archive/html/guix-devel/2018-04/msg00293.html
+
+(define (make-opencl-headers major-version subversion)
+  (let ((commit "e986688daf750633898dfd3994e14a9e618f2aa5")
+        (revision "0"))
+    (package
+      (name "opencl-headers")
+      (version (git-version
+                (string-append major-version "." subversion ".0")
+                revision commit))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url "https://github.com/KhronosGroup/OpenCL-Headers.git")
+                      (commit commit)))
+                (file-name (string-append name "-" commit))
+                (sha256
+                 (base32
+                  "176ydpbyws5nr4av6hf8p41pkhc0rc4m4vrah9w6gp2fw2i32838"))))
+      (build-system gnu-build-system)
+      (arguments
+       `(#:phases
+         (modify-phases %standard-phases
+           (delete 'configure)
+           (delete 'build)
+           (delete 'check)
+           (replace 'install
+             (lambda* (#:key outputs #:allow-other-keys)
+               (copy-recursively (string-append "./opencl" (string-append
+                                                            ,major-version
+                                                            ,subversion) "/CL")
+                                 (string-append
+                                  (assoc-ref outputs "out")
+                                  "/include/CL")))))))
+      (synopsis "The Khronos OpenCL headers")
+      (description
+       "This package provides the C headers by Khronos for OpenCL
+programming.")
+      (home-page "https://www.khronos.org/registry/OpenCL/")
+      (license license:expat))))
+
+(define-public opencl-headers-2.2
+  (make-opencl-headers "2" "2"))
+(define-public opencl-headers-2.1
+  (make-opencl-headers "2" "1"))
+(define-public opencl-headers-2.0
+  (make-opencl-headers "2" "0"))
+(define-public opencl-headers-1.2
+  (make-opencl-headers "1" "2"))
+(define-public opencl-headers-1.1
+  (make-opencl-headers "1" "1"))
+(define-public opencl-headers-1.0
+  (make-opencl-headers "1" "0"))
+
+(define-public opencl-headers opencl-headers-2.2)
+
+(define-public opencl-clhpp
+  (package
+    (name "opencl-clhpp")
+    (version "2.0.10")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "https://github.com/KhronosGroup/OpenCL-CLHPP/archive/v"
+                    version ".tar.gz"))
+              (sha256
+               (base32
+                "0awg6yznbz3h285kmnd47fykx2qa34a07sr4x1657yn3jmi4a9zs"))
+              (file-name (string-append name "-" version ".tar.gz"))))
+    (native-inputs
+     `(("python" ,python-wrapper)))
+    (propagated-inputs
+     `(("opencl-headers" ,opencl-headers)))
+    (arguments
+     `(#:configure-flags
+       (let ((out (assoc-ref %outputs "out")))
+         (list
+          "-DBUILD_EXAMPLES=OFF"
+          "-DBUILD_TESTS=OFF"
+          (string-append "-DCMAKE_INSTALL_PREFIX="
+                         (assoc-ref %outputs "out")
+                         "/include")))
+       ;; regression tests requires a lot more dependencies
+       #:tests? #f))
+    (build-system cmake-build-system)
+    (home-page "http://github.khronos.org/OpenCL-CLHPP/")
+    (synopsis "Khronos OpenCL-CLHPP")
+    (description
+     "This package provides the @dfn{host API} C++ headers for OpenCL.")
+    (license license:expat)))