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FindGRPC.cmake
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FindGRPC.cmake
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# Copyright 2018 gRPC authors.
#
# 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.
#
# cmake build file for C++ route_guide example.
# Assumes protobuf and gRPC have been installed using cmake.
# See cmake_externalproject/CMakeLists.txt for all-in-one cmake build
# that automatically builds all the dependencies before building route_guide.
cmake_minimum_required(VERSION 3.5.1)
set (CMAKE_CXX_STANDARD 11)
if(MSVC)
add_definitions(-D_WIN32_WINNT=0x600)
endif()
find_package(Threads REQUIRED)
if(GRPC_AS_SUBMODULE)
# One way to build a projects that uses gRPC is to just include the
# entire gRPC project tree via "add_subdirectory".
# This approach is very simple to use, but the are some potential
# disadvantages:
# * it includes gRPC's CMakeLists.txt directly into your build script
# without and that can make gRPC's internal setting interfere with your
# own build.
# * depending on what's installed on your system, the contents of submodules
# in gRPC's third_party/* might need to be available (and there might be
# additional prerequisites required to build them). Consider using
# the gRPC_*_PROVIDER options to fine-tune the expected behavior.
#
# A more robust approach to add dependency on gRPC is using
# cmake's ExternalProject_Add (see cmake_externalproject/CMakeLists.txt).
# Include the gRPC's cmake build (normally grpc source code would live
# in a git submodule called "third_party/grpc", but this example lives in
# the same repository as gRPC sources, so we just look a few directories up)
add_subdirectory(../../.. ${CMAKE_CURRENT_BINARY_DIR}/grpc EXCLUDE_FROM_ALL)
message(STATUS "Using gRPC via add_subdirectory.")
# After using add_subdirectory, we can now use the grpc targets directly from
# this build.
set(_PROTOBUF_LIBPROTOBUF libprotobuf)
set(_REFLECTION grpc++_reflection)
if(CMAKE_CROSSCOMPILING)
find_program(_PROTOBUF_PROTOC protoc)
else()
set(_PROTOBUF_PROTOC $<TARGET_FILE:protobuf::protoc>)
endif()
set(_GRPC_GRPCPP grpc++)
if(CMAKE_CROSSCOMPILING)
find_program(_GRPC_CPP_PLUGIN_EXECUTABLE grpc_cpp_plugin)
else()
set(_GRPC_CPP_PLUGIN_EXECUTABLE $<TARGET_FILE:grpc_cpp_plugin>)
endif()
elseif(GRPC_FETCHCONTENT)
# Another way is to use CMake's FetchContent module to clone gRPC at
# configure time. This makes gRPC's source code available to your project,
# similar to a git submodule.
message(STATUS "Using gRPC via add_subdirectory (FetchContent).")
include(FetchContent)
FetchContent_Declare(
grpc
GIT_REPOSITORY https://github.com/grpc/grpc.git
# when using gRPC, you will actually set this to an existing tag, such as
# v1.25.0, v1.26.0 etc..
# For the purpose of testing, we override the tag used to the commit
# that's currently under test.
GIT_TAG vGRPC_TAG_VERSION_OF_YOUR_CHOICE)
FetchContent_MakeAvailable(grpc)
# Since FetchContent uses add_subdirectory under the hood, we can use
# the grpc targets directly from this build.
set(_PROTOBUF_LIBPROTOBUF libprotobuf)
set(_REFLECTION grpc++_reflection)
set(_PROTOBUF_PROTOC $<TARGET_FILE:protoc>)
set(_GRPC_GRPCPP grpc++)
if(CMAKE_CROSSCOMPILING)
find_program(_GRPC_CPP_PLUGIN_EXECUTABLE grpc_cpp_plugin)
else()
set(_GRPC_CPP_PLUGIN_EXECUTABLE $<TARGET_FILE:grpc_cpp_plugin>)
endif()
else()
# This branch assumes that gRPC and all its dependencies are already installed
# on this system, so they can be located by find_package().
# Find Protobuf installation
# Looks for protobuf-config.cmake file installed by Protobuf's cmake installation.
set(protobuf_MODULE_COMPATIBLE TRUE)
find_package(Protobuf CONFIG REQUIRED)
message(STATUS "Using protobuf ${Protobuf_VERSION}")
set(_PROTOBUF_LIBPROTOBUF protobuf::libprotobuf)
set(_REFLECTION gRPC::grpc++_reflection)
if(CMAKE_CROSSCOMPILING)
find_program(_PROTOBUF_PROTOC protoc)
else()
set(_PROTOBUF_PROTOC $<TARGET_FILE:protobuf::protoc>)
endif()
# Find gRPC installation
# Looks for gRPCConfig.cmake file installed by gRPC's cmake installation.
find_package(gRPC CONFIG REQUIRED)
message(STATUS "Using gRPC ${gRPC_VERSION}")
set(_GRPC_GRPCPP gRPC::grpc++)
if(CMAKE_CROSSCOMPILING)
find_program(_GRPC_CPP_PLUGIN_EXECUTABLE grpc_cpp_plugin)
else()
set(_GRPC_CPP_PLUGIN_EXECUTABLE $<TARGET_FILE:gRPC::grpc_cpp_plugin>)
endif()
endif()