The proto files are generated in an other package.
package with service:

cmake_minimum_required(VERSION`

 2.8.3)
project(corbslam_server)


IF (NOT CMAKE_BUILD_TYPE)
    SET(CMAKE_BUILD_TYPE Release)
ENDIF ()

MESSAGE("Build type: " ${CMAKE_BUILD_TYPE})

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}  -Wall -O3 -march=native ")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -O3 -march=native ")

# Check C++11 or C++0x support
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
if (COMPILER_SUPPORTS_CXX11)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
    add_definitions(-DCOMPILEDWITHC11)
    message(STATUS "Using flag -std=c++11.")
elseif (COMPILER_SUPPORTS_CXX0X)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
    add_definitions(-DCOMPILEDWITHC0X)
    message(STATUS "Using flag -std=c++0x.")
else ()
    message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
endif ()


list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/Modules")

## Find catkin macros and libraries
## if COMPONENTS list like find_package(catkin REQUIRED COMPONENTS xyz)
## is used, also find other catkin packages
find_package(catkin REQUIRED COMPONENTS
        roscpp
        rospy
        std_msgs
        message_generation
        tf
	    corbslam_client
	    grpc
        )
find_package(OpenCV REQUIRED)
find_package(Eigen3 3.1.0 REQUIRED)
find_package(Pangolin REQUIRED)
find_package(Boost COMPONENTS serialization system filesystem REQUIRED)


catkin_package(
        #  INCLUDE_DIRS include
        #  LIBRARIES orbslam_server
        #  CATKIN_DEPENDS roscpp rospy std_msgs
        #  DEPENDS system_lib
        CATKIN_DEPENDS message_runtime corbslam_client
)

include_directories(
        ${catkin_INCLUDE_DIRS}
        ${Boost_INCLUDE_DIR}
        ${EIGEN3_INCLUDE_DIR}
        ${Pangolin_INCLUDE_DIRS}
        ${PROJECT_SOURCE_DIR}
        ${PROJECT_SOURCE_DIR}/include
)


set(corbslam_server_SOURCES
        ${PROJECT_SOURCE_DIR}/src/MapFusion.cpp
        ${PROJECT_SOURCE_DIR}/src/main.cpp
        ${PROJECT_SOURCE_DIR}/src/ServerMap.cpp
        ${PROJECT_SOURCE_DIR}/src/ServerMapView.cpp
        ${PROJECT_SOURCE_DIR}/src/PubToClient.cpp
        ${PROJECT_SOURCE_DIR}/src/GlobalOptimize.cpp
        )


add_executable(corbslam_server
        ${corbslam_server_SOURCES}
)
target_link_libraries(corbslam_server
        ${catkin_LIBRARIES}
        ${Boost_LIBRARIES}
        ${OpenCV_LIBS}
        ${EIGEN3_LIBS}
        ${Pangolin_LIBRARIES}

        /home/fabian/SLAM/ws/devel/lib/libgrpc++_unsecure.so
        )

client package with proto file:

cmake_minimum_required(VERSION 2.8)
project(corbslam_client)

IF (NOT CMAKE_BUILD_TYPE)
    SET(CMAKE_BUILD_TYPE Release)
ENDIF ()

MESSAGE("Build type: " ${CMAKE_BUILD_TYPE})

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}  -Wall -O3 -march=native ")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -O3 -march=native ")

# Check C++11 or C++0x support
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
if (COMPILER_SUPPORTS_CXX11)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
    add_definitions(-DCOMPILEDWITHC11)
    message(STATUS "Using flag -std=c++11.")
elseif (COMPILER_SUPPORTS_CXX0X)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
    add_definitions(-DCOMPILEDWITHC0X)
    message(STATUS "Using flag -std=c++0x.")
else ()
    message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
endif ()

## Find catkin macros and libraries
## if COMPONENTS list like find_package(catkin REQUIRED COMPONENTS xyz)
## is used, also find other catkin packages

LIST(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake_modules)

find_package(catkin REQUIRED COMPONENTS
        roscpp
        rospy
        cv_bridge
        std_msgs
        tf
        message_generation
	    genmsg
        pcl_conversions
        pcl_ros
        grpc
        )

find_package(OpenCV REQUIRED)
find_package(Eigen3 REQUIRED)
find_package(Pangolin REQUIRED)
find_package(Boost COMPONENTS serialization system filesystem REQUIRED)

## Generate messages in the 'msg' folder
add_message_files(
        DIRECTORY msg
        FILES
        corbslam_message.msg
)

## Generate services in the 'srv' folder
add_service_files(
        DIRECTORY srv
        FILES
        corbslam_insert.srv
        corbslam_update.srv
)

## Generate actions in the 'action' folder
# add_action_files(
#   FILES
#   Action1.action
#   Action2.action
# )

## Generate added messages and services with any dependencies listed here
generate_messages(
        DEPENDENCIES
        std_msgs
)

generate_proto(corb_proto GRPC proto/corbslam.proto)

catkin_package(
          INCLUDE_DIRS include
          LIBRARIES corbslam_client corb_proto
           CATKIN_DEPENDS roscpp rospy std_msgs message_runtime grpc
)

include_directories(
        ${catkin_INCLUDE_DIRS}
        ${PROJECT_SOURCE_DIR}
        ${PROJECT_SOURCE_DIR}/include
        ${EIGEN3_INCLUDE_DIRS}
        ${OpenCV_INCLUDE_DIRS}
        ${Pangolin_INCLUDE_DIRS}
        ${Boost_INCLUDE_DIRS}
)

## Declare a C++ library

LINK_DIRECTORIES(/usr/local/lib )


add_library(${PROJECT_NAME}
        src/System.cc
        src/Tracking.cc
        src/LocalMapping.cc
        src/LoopClosing.cc
        src/ORBextractor.cc
        src/ORBmatcher.cc
        src/FrameDrawer.cc
        src/Converter.cc
        src/MapPoint.cc
        src/KeyFrame.cc
        src/Map.cc
        src/MapDrawer.cc
        src/Optimizer.cc
        src/PnPsolver.cc
        src/Frame.cc
        src/KeyFrameDatabase.cc
        src/Sim3Solver.cc
        src/Initializer.cc
        src/Viewer.cc
        include/Cache.h
        src/Cache.cc
        include/LightKeyFrame.h
        src/LightKeyFrame.cc
        include/LightMapPoint.h
        src/LightMapPoint.cc
        include/SerializeObject.h
        include/DataDriver.h
        src/DataDriver.cc
        include/TransPose.h
        src/TransPose.cpp
        src/ProtoConversions.cpp)

target_link_libraries(${PROJECT_NAME}
        ${OpenCV_LIBRARIES}
        ${catkin_LIBRARIES}
        ${EIGEN3_LIBRARIES}
        ${Pangolin_LIBRARIES}
        ${Boost_LIBRARIES}
        corb_proto 
        )
add_dependencies(corbslam_client ${${PROJECT_NAME}_EXPORTED_TARGETS} ${catkin_EXPORTED_TARGETS})

Linker error when using GRPC #29

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