grpc: new package (#13054)

* Add grpc@1.23.1

* Let version in url match actual one

var/spack/repos/builtin/packages/grpc/package.py

@@ -0,0 +1,43 @@
+# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+from spack import *
+
+
+class Grpc(CMakePackage):
+    """A high performance, open-source universal RPC framework."""
+
+    homepage = "https://grpc.io"
+    url      = "https://github.com/grpc/grpc/archive/v1.23.1.tar.gz"
+
+    version('1.23.1', sha256='dd7da002b15641e4841f20a1f3eb1e359edb69d5ccf8ac64c362823b05f523d9')
+
+    variant('codegen', default=True,
+            description='Builds code generation plugins for protobuf '
+                        'compiler (protoc)')
+
+    depends_on('protobuf')
+    depends_on('openssl')
+    depends_on('zlib')
+    depends_on('cares')
+
+    def cmake_args(self):
+        args = [
+            '-DgRPC_BUILD_CODEGEN:Bool={0}'.format(
+                'ON' if '+codegen' in self.spec else 'OFF'),
+            '-DgRPC_BUILD_CSHARP_EXT:Bool=OFF',
+            '-DgRPC_INSTALL:Bool=ON',
+            # Tell grpc to skip vendoring and look for deps via find_package:
+            '-DgRPC_CARES_PROVIDER:String=package',
+            '-DgRPC_ZLIB_PROVIDER:String=package',
+            '-DgRPC_SSL_PROVIDER:String=package',
+            '-DgRPC_PROTOBUF_PROVIDER:String=package',
+            '-DgRPC_USE_PROTO_LITE:Bool=OFF',
+            '-DgRPC_PROTOBUF_PACKAGE_TYPE:String=CONFIG',
+            # Disable tests:
+            '-DgRPC_BUILD_TESTS:BOOL=OFF',
+            '-DgRPC_GFLAGS_PROVIDER:String=none',
+            '-DgRPC_BENCHMARK_PROVIDER:String=none',
+        ]
+        return args