CMakeLists_interface.cmake

# protobuf & gRPC --------------------------------------------------------
# Protobuf
set(protobuf_MODULE_COMPATIBLE TRUE)
find_package(Protobuf CONFIG REQUIRED)
message(STATUS "Using protobuf ${protobuf_VERSION}")
# Protobuf-compiler
set(_PROTOBUF_PROTOC $<TARGET_FILE:protobuf::protoc>)
set(_PROTOBUF_LIBPROTOBUF protobuf::libprotobuf)
set(_REFLECTION gRPC::grpc++_reflection)

# gRPC
set(_GRPC_GRPCPP gRPC::grpc++)
set(_GRPC_CPP_PLUGIN_EXECUTABLE $<TARGET_FILE:gRPC::grpc_cpp_plugin>)

# Proto file
get_filename_component(hw_proto_interface "${SOURCE_FOLDER}/interface.proto" ABSOLUTE)
get_filename_component(hw_proto_path_interface "${hw_proto_interface}" PATH)
# Generated sources
set(hw_proto_srcs_interface "${CMAKE_CURRENT_BINARY_DIR}/interface.pb.cc")
set(hw_proto_hdrs_interface "${CMAKE_CURRENT_BINARY_DIR}/interface.pb.h")
set(hw_grpc_srcs_interface "${CMAKE_CURRENT_BINARY_DIR}/interface.grpc.pb.cc")
set(hw_grpc_hdrs_interface "${CMAKE_CURRENT_BINARY_DIR}/interface.grpc.pb.h")

add_custom_command(
      OUTPUT 
        "${hw_proto_srcs_interface}" 
        "${hw_proto_hdrs_interface}" 
        "${hw_grpc_srcs_interface}" 
        "${hw_grpc_hdrs_interface}" 
      COMMAND ${_PROTOBUF_PROTOC}
      ARGS --grpc_out "${CMAKE_CURRENT_BINARY_DIR}"
        --cpp_out "${CMAKE_CURRENT_BINARY_DIR}"
        -I "${hw_proto_path_interface}"
        --plugin=protoc-gen-grpc="${_GRPC_CPP_PLUGIN_EXECUTABLE}"
        "${hw_proto_interface}"
      DEPENDS "${hw_proto_interface}"
)

# Include generated *.pb.h files
include_directories("${CMAKE_CURRENT_BINARY_DIR}")

# custom_hw_grpc_proto
add_library(custom_hw_grpc_proto
  ${hw_grpc_srcs_interface}
  ${hw_grpc_hdrs_interface}
  ${hw_proto_srcs_interface}
  ${hw_proto_hdrs_interface}
)
target_link_libraries(custom_hw_grpc_proto
  ${_REFLECTION}
  ${_GRPC_GRPCPP}
  ${_PROTOBUF_LIBPROTOBUF})
  
#--------------------------------------------------------