Fix build by moving linker flags after message generation (#295)

spatio_temporal_voxel_layer/CMakeLists.txt

@@ -9,9 +9,6 @@ if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   add_compile_options(-Wall -Wextra -Wpedantic)
 endif()
 
-# Get a linker error when there are undefined symbols
-add_link_options(-Wl,--no-undefined)
-
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake/")
 
 find_package(ament_cmake REQUIRED)
@@ -82,6 +79,9 @@ rosidl_generate_interfaces(${PROJECT_NAME}
 )
 rosidl_get_typesupport_target(cpp_typesupport_target "${PROJECT_NAME}" "rosidl_typesupport_cpp")
 
+# Get a linker error when there are undefined symbols
+add_link_options(-Wl,--no-undefined)
+
 include_directories(
     include
     ${BOOST_INCLUDE_DIRS}