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# This setup requires gRPC to be built from sources using CMake and installed to
# ${GRPC_INSTALL_PATH} via -DCMAKE_INSTALL_PREFIX=${GRPC_INSTALL_PATH}.
# FIXME(kirillbobyrev): Check if gRPC and Protobuf headers can be included at
# configure time.
if (GRPC_INSTALL_PATH)
set(protobuf_MODULE_COMPATIBLE TRUE)
find_package(Protobuf CONFIG REQUIRED HINTS ${GRPC_INSTALL_PATH})
message(STATUS "Using protobuf ${protobuf_VERSION}")
find_package(gRPC CONFIG REQUIRED HINTS ${GRPC_INSTALL_PATH})
message(STATUS "Using gRPC ${gRPC_VERSION}")
include_directories(${Protobuf_INCLUDE_DIRS})
# gRPC CMake CONFIG gives the libraries slightly odd names, make them match
# the conventional system-installed names.
set_target_properties(protobuf::libprotobuf PROPERTIES IMPORTED_GLOBAL TRUE)
add_library(protobuf ALIAS protobuf::libprotobuf)
set_target_properties(gRPC::grpc++ PROPERTIES IMPORTED_GLOBAL TRUE)
add_library(grpc++ ALIAS gRPC::grpc++)
set(GRPC_CPP_PLUGIN $<TARGET_FILE:gRPC::grpc_cpp_plugin>)
set(PROTOC ${Protobuf_PROTOC_EXECUTABLE})
else()
find_program(GRPC_CPP_PLUGIN grpc_cpp_plugin)
find_program(PROTOC protoc)
if (GRPC_CPP_PLUGIN-NOTFOUND OR PROTOC-NOTFOUND)
message(FATAL_ERROR "gRPC C++ Plugin and Protoc must be on $PATH for Clangd remote index build")
endif()
# On macOS the libraries are typically installed via Homebrew and are not on
# the system path.
if (${APPLE})
find_program(HOMEBREW brew)
# If Homebrew is not found, the user might have installed libraries
# manually. Fall back to the system path.
if (NOT HOMEBREW-NOTFOUND)
execute_process(COMMAND ${HOMEBREW} --prefix grpc
OUTPUT_VARIABLE GRPC_HOMEBREW_PATH
RESULT_VARIABLE GRPC_HOMEBREW_RETURN_CODE
OUTPUT_STRIP_TRAILING_WHITESPACE)
execute_process(COMMAND ${HOMEBREW} --prefix protobuf
OUTPUT_VARIABLE PROTOBUF_HOMEBREW_PATH
RESULT_VARIABLE PROTOBUF_HOMEBREW_RETURN_CODE
OUTPUT_STRIP_TRAILING_WHITESPACE)
# If either library is not installed via Homebrew, fall back to the
# system path.
if (GRPC_HOMEBREW_RETURN_CODE EQUAL "0")
include_directories(${GRPC_HOMEBREW_PATH}/include)
link_directories(${GRPC_HOMEBREW_PATH}/lib)
endif()
if (PROTOBUF_HOMEBREW_RETURN_CODE EQUAL "0")
include_directories(${PROTOBUF_HOMEBREW_PATH}/include)
link_directories(${PROTOBUF_HOMEBREW_PATH}/lib)
endif()
endif()
endif()
endif()
# Proto headers are generated in ${CMAKE_CURRENT_BINARY_DIR}.
# Libraries that use these headers should adjust the include path.
# FIXME(kirillbobyrev): Allow optional generation of gRPC code and give callers
# control over it via additional parameters.
function(generate_grpc_protos LibraryName ProtoFile)
get_filename_component(ProtoSourceAbsolutePath "${CMAKE_CURRENT_SOURCE_DIR}/${ProtoFile}" ABSOLUTE)
get_filename_component(ProtoSourcePath ${ProtoSourceAbsolutePath} PATH)
set(GeneratedProtoSource "${CMAKE_CURRENT_BINARY_DIR}/Index.pb.cc")
set(GeneratedProtoHeader "${CMAKE_CURRENT_BINARY_DIR}/Index.pb.h")
set(GeneratedGRPCSource "${CMAKE_CURRENT_BINARY_DIR}/Index.grpc.pb.cc")
set(GeneratedGRPCHeader "${CMAKE_CURRENT_BINARY_DIR}/Index.grpc.pb.h")
add_custom_command(
OUTPUT "${GeneratedProtoSource}" "${GeneratedProtoHeader}" "${GeneratedGRPCSource}" "${GeneratedGRPCHeader}"
COMMAND ${PROTOC}
ARGS --grpc_out="${CMAKE_CURRENT_BINARY_DIR}"
--cpp_out="${CMAKE_CURRENT_BINARY_DIR}"
--proto_path="${ProtoSourcePath}"
--plugin=protoc-gen-grpc="${GRPC_CPP_PLUGIN}"
"${ProtoSourceAbsolutePath}"
DEPENDS "${ProtoSourceAbsolutePath}")
add_clang_library(${LibraryName} ${GeneratedProtoSource} ${GeneratedGRPCSource}
PARTIAL_SOURCES_INTENDED
LINK_LIBS grpc++ protobuf)
endfunction()
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