gnu: gRPC: Update to 1.27.3.

* gnu/packages/rpc.scm (grpc): Update to 1.27.3.
[arguments]: Add "-DgRPC_ABSL_PROVIDER=package" in #:configure-flags.
[inputs]: Add ABSEIL-CPP.
(grpc-1.16.1): New public variable.
* gnu/packages/hyperledger.scm (hyperledger-iroha)[inputs]: Change from GRPC
to GRPC-1.16.
* gnu/packages/machine-learning.scm (tensorflow)[native-inputs, inputs]: Likewise.

gnu/packages/hyperledger.scm

@@ -190,7 +190,7 @@ link-time.  New implementations can be added as well.")
     (inputs
      `(("boost" ,boost-1.69)
        ("gflags" ,gflags)
-       ("grpc" ,grpc)
+       ("grpc" ,grpc-1.16.1)
        ("hyperledger-iroha-ed25519" ,hyperledger-iroha-ed25519)
        ("postgresql" ,postgresql)
        ("protobuf" ,protobuf)

gnu/packages/machine-learning.scm

@@ -1708,7 +1708,7 @@ INSTALL_RPATH " (assoc-ref outputs "out") "/lib)\n")))
              (sha256
               (base32
                "161g9841rjfsy5pn52fcis0s9hdr7rxvb06pad38j5rppfihvign")))))
-       ("grpc" ,grpc "static")
+       ("grpc" ,grpc-1.16.1 "static")
        ("googletest" ,googletest)
        ("swig" ,swig)
        ("unzip" ,unzip)))
@@ -1730,7 +1730,7 @@ INSTALL_RPATH " (assoc-ref outputs "out") "/lib)\n")))
        ("libjpeg" ,libjpeg)
        ("libpng" ,libpng)
        ("giflib" ,giflib)
-       ("grpc:bin" ,grpc)
+       ("grpc:bin" ,grpc-1.16.1)
        ("jsoncpp" ,jsoncpp-for-tensorflow)
        ("snappy" ,snappy)
        ("sqlite" ,sqlite)

gnu/packages/rpc.scm

@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2019 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2020 Marius Bakke <mbakke@fastmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -26,6 +27,7 @@
   #:use-module (guix build-system python)
   #:use-module (gnu packages adns)
   #:use-module (gnu packages compression)
+  #:use-module (gnu packages cpp)
   #:use-module (gnu packages protobuf)
   #:use-module (gnu packages python)
   #:use-module (gnu packages python-xyz)
@@ -34,7 +36,7 @@
 (define-public grpc
   (package
     (name "grpc")
-    (version "1.16.1")
+    (version "1.27.3")
     (outputs '("out" "static"))
     (source (origin
               (method git-fetch)
@@ -44,12 +46,13 @@
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "1jimqz3115f9pli5w6ik9wi7mjc7ix6y7yrq4a1ab9fc3dalj7p2"))))
+                "0czmbwnafc7jnrrq2fnac2av83vs2q7q0wy4k11w9zbpld7j5h6d"))))
     (build-system cmake-build-system)
     (arguments
      `(#:tests? #f ; no test target
        #:configure-flags
        (list "-DgRPC_ZLIB_PROVIDER=package"
+             "-DgRPC_ABSL_PROVIDER=package"
              "-DgRPC_CARES_PROVIDER=package"
              "-DgRPC_SSL_PROVIDER=package"
              "-DgRPC_PROTOBUF_PROVIDER=package"
@@ -89,7 +92,8 @@
                    (find-files "." "\\.a$"))))
              #t)))))
     (inputs
-     `(("c-ares" ,c-ares/cmake)
+     `(("abseil-cpp" ,abseil-cpp)
+       ("c-ares" ,c-ares/cmake)
        ("openssl" ,openssl)
        ("zlib" ,zlib)))
     (native-inputs
@@ -105,6 +109,21 @@ mile of distributed computing to connect devices, mobile applications and
 browsers to backend services.")
     (license license:asl2.0)))
 
+;; Some packages require this older version.
+(define-public grpc-1.16.1
+  (package
+    (inherit grpc)
+    (version "1.16.1")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/grpc/grpc.git")
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name "grpc" version))
+              (sha256
+               (base32
+                "1jimqz3115f9pli5w6ik9wi7mjc7ix6y7yrq4a1ab9fc3dalj7p2"))))))
+
 (define-public python-grpcio
   (package
     (name "python-grpcio")