mavsdk_server: simplify linking

On Windows, the mavsdk_server unit tests don't link properly when
building with shared libs. For whatever reason the transitive
dependencies didn't get tracked from the protobu/grpc components all the
way into the mavsdk_server unit tests.

I suspect that either some symbols get stripped too early, or it has to
do with the export visibility in MSVC.

I couldn't quite get to the bottom of it but I realized that we could
just simplify it by avoiding the little libraries and just adding all
sources to the mavsdk_server library in the first place.

Let's see if it works...

Signed-off-by: Julian Oes <[email protected]>

Author: julianoes

src/mavsdk_server/src/CMakeLists.txt

@@ -1,35 +1,23 @@
 cmake_minimum_required(VERSION 3.10.2)
 
+list(APPEND MAVSDK_SERVER_SOURCES
+    mavsdk_server_api.h
+    mavsdk_server_api.cpp
+    mavsdk_server.cpp
+    grpc_server.cpp
+)
+
 set(COMPONENTS_LIST ${ENABLED_PLUGINS})
 list(APPEND COMPONENTS_LIST core)
-
 foreach(COMPONENT_NAME ${COMPONENTS_LIST})
-    add_library(${COMPONENT_NAME}_proto_gens STATIC
+    list(APPEND MAVSDK_SERVER_SOURCES
         ${CMAKE_CURRENT_SOURCE_DIR}/generated/${COMPONENT_NAME}/${COMPONENT_NAME}.grpc.pb.cc
         ${CMAKE_CURRENT_SOURCE_DIR}/generated/${COMPONENT_NAME}/${COMPONENT_NAME}.pb.cc
         ${CMAKE_CURRENT_SOURCE_DIR}/generated/mavsdk_options.grpc.pb.cc
         ${CMAKE_CURRENT_SOURCE_DIR}/generated/mavsdk_options.pb.cc
         )
-
-    target_link_libraries(${COMPONENT_NAME}_proto_gens
-        gRPC::grpc++
-    )
-
-    target_include_directories(${COMPONENT_NAME}_proto_gens
-        PRIVATE
-        ${PROJECT_SOURCE_DIR}/mavsdk_server/src/generated
-    )
-
-    list(APPEND COMPONENTS_PROTOGENS ${COMPONENT_NAME}_proto_gens)
 endforeach()
 
-set(MAVSDK_SERVER_SOURCES
-    mavsdk_server_api.h
-    mavsdk_server_api.cpp
-    mavsdk_server.cpp
-    grpc_server.cpp
-)
-
 if(IOS OR (APPLE AND MACOS_FRAMEWORK))
     set_property(SOURCE module.modulemap
         PROPERTY MACOSX_PACKAGE_LOCATION "Modules")
@@ -47,7 +35,6 @@ target_link_libraries(mavsdk_server
     PRIVATE
     mavsdk
     gRPC::grpc++
-    ${COMPONENTS_PROTOGENS}
 )
 
 if(BUILD_WITH_PROTO_REFLECTION)