protobuf 报错问题

问题未找到原因，但是可以直接忽略，使用Cmake编译生成可执行文件

CMakeList.txt

cmake_minimum_required(VERSION 3.5)

PROJECT(bin)

# Find required protobuf package
find_package(Protobuf REQUIRED)
if(PROTOBUF_FOUND)
    message(STATUS "protobuf library found")
else()
    message(FATAL_ERROR "protobuf library is needed but cant be found")
endif()

include_directories(${PROTOBUF_INCLUDE_DIRS})

include_directories("/usr/include/")

add_compile_options( -std=c++11 -O3 -Wall -c -fmessage-length=0 -fPIC -fPIE -pie -fstack-protector-all -Wtrampolines )

add_executable (proto_r Reader.cpp Mymessage.pb.cc)
target_link_libraries(proto_r  ${PROTOBUF_LIBRARIES} )

add_executable (proto_w Writer.cpp Mymessage.pb.cc)
target_link_libraries(proto_w  ${PROTOBUF_LIBRARIES} )

SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)