1 files changed, 83 insertions, 0 deletions
diff --git a/cmake/external/grpc.cmake b/cmake/external/grpc.cmake
new file mode 100644
index 0000000..fb54960
--- /dev/null
+++ b/cmake/external/grpc.cmake
@@ -0,0 +1,83 @@
+# Copyright 2018 Google
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+include(ExternalProject)
+include(ExternalProjectFlags)
+include(FindZLIB)
+
+if(GRPC_ROOT)
+  # If the user has supplied a GRPC_ROOT then just use it. Add an empty custom
+  # target so that the superbuild dependencies still work.
+  add_custom_target(grpc)
+
+else()
+  set(
+    GIT_SUBMODULES
+    third_party/boringssl
+    third_party/cares/cares
+  )
+
+  set(
+    CMAKE_ARGS
+    -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
+    -DgRPC_BUILD_TESTS:BOOL=OFF
+    -DBUILD_SHARED_LIBS:BOOL=OFF
+  )
+
+  # zlib can be built by grpc but we can avoid it on platforms that provide it
+  # by default.
+  find_package(ZLIB)
+  if(ZLIB_FOUND)
+    list(
+      APPEND CMAKE_ARGS
+      -DgRPC_ZLIB_PROVIDER:STRING=package
+      -DZLIB_INCLUDE_DIR=${ZLIB_INCLUDE_DIR}
+      -DZLIB_LIBRARY=${ZLIB_LIBRARY}
+    )
+
+  else()
+    list(
+      APPEND GIT_SUBMODULES
+      third_party/zlib
+    )
+
+  endif(ZLIB_FOUND)
+
+  ExternalProject_GitSource(
+    GRPC_GIT
+    GIT_REPOSITORY "https://github.com/grpc/grpc.git"
+    GIT_TAG "v1.8.3"
+    GIT_SUBMODULES ${GIT_SUBMODULES}
+  )
+
+  ExternalProject_Add(
+    grpc
+    DEPENDS
+      leveldb  # for sequencing
+
+    ${GRPC_GIT}
+
+    PREFIX ${PROJECT_BINARY_DIR}/external/grpc
+
+    CMAKE_ARGS ${CMAKE_ARGS}
+
+    BUILD_COMMAND
+      ${CMAKE_COMMAND} --build . --target grpc
+
+    TEST_COMMAND ""
+    INSTALL_COMMAND ""
+  )
+
+endif(GRPC_ROOT)
+