--- /dev/null
+# Proto file
+get_filename_component(proto_file "./protos/messages.proto" ABSOLUTE)
+get_filename_component(proto_file_path "${proto_file}" PATH)
+
+message("PATH:${proto_file_path}:${proto_file}")
+# Generated sources
+set(example_proto_srcs "${CMAKE_CURRENT_BINARY_DIR}/messages.pb.cc")
+set(example_proto_hdrs "${CMAKE_CURRENT_BINARY_DIR}/messages.pb.h")
+set(example_grpc_srcs "${CMAKE_CURRENT_BINARY_DIR}/messages.grpc.pb.cc")
+set(example_grpc_hdrs "${CMAKE_CURRENT_BINARY_DIR}/messages.grpc.pb.h")
+
+add_custom_command(
+ OUTPUT "${example_proto_srcs}" "${example_proto_hdrs}" "${example_grpc_srcs}"
+ "${example_grpc_hdrs}"
+ COMMAND
+ ${PROTOBUF_PROTOC_EXECUTABLE} ARGS "--grpc_out=${CMAKE_CURRENT_BINARY_DIR}"
+ "--cpp_out=${CMAKE_CURRENT_BINARY_DIR}" "--proto_path=${proto_file_path}"
+ "--plugin=protoc-gen-grpc=${gRPC_CPP_PLUGIN_EXECUTABLE}" "${proto_file}")
+
+add_library(example_grpc_proto ${example_grpc_srcs} ${example_grpc_hdrs}
+ ${example_proto_srcs} ${example_proto_hdrs})
+
+include(${PROJECT_SOURCE_DIR}/cmake/proto-options-patch.cmake)
+patch_protobuf_targets(example_grpc_proto)
+
+include_directories(
+ ${CMAKE_SOURCE_DIR}/exporters/ostream/include ${CMAKE_SOURCE_DIR}/ext/include
+ ${CMAKE_SOURCE_DIR}/api/include/ ${CMAKE_SOURCE_DIR/})
+
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+if(TARGET protobuf::libprotobuf)
+ target_link_libraries(example_grpc_proto gRPC::grpc++ protobuf::libprotobuf)
+else()
+ target_include_directories(example_grpc_proto ${Protobuf_INCLUDE_DIRS})
+ target_link_libraries(example_grpc_proto ${Protobuf_LIBRARIES})
+endif()
+
+foreach(_target client server)
+ add_executable(${_target} "${_target}.cc")
+ target_link_libraries(
+ ${_target} example_grpc_proto protobuf::libprotobuf gRPC::grpc++
+ opentelemetry_trace opentelemetry_exporter_ostream_span)
+ patch_protobuf_targets(${_target})
+endforeach()