gnu: Add c-ares-next.

* gnu/packages/adns.scm (c-ares-next): New variable.

gnu/packages/adns.scm

@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2014 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2015, 2016, 2018 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -21,6 +22,7 @@
   #:use-module (guix licenses)
   #:use-module (guix packages)
   #:use-module (guix download)
+  #:use-module (guix build-system cmake)
   #:use-module (guix build-system gnu)
   #:use-module (gnu packages pkg-config))
 
@@ -80,3 +82,33 @@ queries without blocking, or need to perform multiple DNS queries in parallel.
 The primary examples of such applications are servers which communicate with
 multiple clients and programs with graphical user interfaces.")
     (license (x11-style "https://c-ares.haxx.se/license.html"))))
+
+;; XXX: temporary package for tensorflow / grpc
+(define-public c-ares-next
+  (package
+    (name "c-ares")
+    (version "1.15.0")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "https://c-ares.haxx.se/download/" name "-" version
+                    ".tar.gz"))
+              (sha256
+               (base32
+                "0lk8knip4xk6qzksdkn7085mmgm4ixfczdyyjw656c193y3rgnvc"))))
+    (build-system cmake-build-system)
+    (arguments
+     `(#:tests? #f ; some tests seem to require Internet connection
+       #:configure-flags
+       (list "-DCARES_BUILD_TESTS=ON")))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)))
+    (home-page "https://c-ares.haxx.se/")
+    (synopsis "C library for asynchronous DNS requests")
+    (description
+      "C-ares is a C library that performs DNS requests and name resolution
+asynchronously.  It is intended for applications which need to perform DNS
+queries without blocking, or need to perform multiple DNS queries in parallel.
+The primary examples of such applications are servers which communicate with
+multiple clients and programs with graphical user interfaces.")
+    (license (x11-style "https://c-ares.haxx.se/license.html"))))