combining fds example and lifght swich client

Hello,

I am trying to insert fds functionality to light switch client. I added all files and libraries to project. But when i try to compile project i face with errors :

1> build/light_switch_client_nrf52832_xxAA_s132_6.1.0_Debug/obj/nrf_log_frontend.o: In function `backend_name_get':
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:1462: undefined reference to `__stop_log_backends'
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:1462: undefined reference to `__start_log_backends'
1> build/light_switch_client_nrf52832_xxAA_s132_6.1.0_Debug/obj/nrf_log_frontend.o: In function `log_cmd_backends_list':
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:1411: undefined reference to `__stop_log_backends'
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:1411: undefined reference to `__start_log_backends'
1> build/light_switch_client_nrf52832_xxAA_s132_6.1.0_Debug/obj/nrf_log_frontend.o: In function `backend_find':
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:1097: undefined reference to `__stop_log_backends'
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:1097: undefined reference to `__start_log_backends'
1> build/light_switch_client_nrf52832_xxAA_s132_6.1.0_Debug/obj/nrf_log_frontend.o: In function `nrf_log_module_filter_set':
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:276: undefined reference to `__start_log_filter_data'
1> build/light_switch_client_nrf52832_xxAA_s132_6.1.0_Debug/obj/nrf_log_frontend.o: In function `nrf_log_module_filter_get':
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:290: undefined reference to `__start_log_filter_data'
1> build/light_switch_client_nrf52832_xxAA_s132_6.1.0_Debug/obj/nrf_log_frontend.o: In function `nrf_log_frontend_dequeue':
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:886: undefined reference to `__start_log_filter_data'
1> build/light_switch_client_nrf52832_xxAA_s132_6.1.0_Debug/obj/nrf_log_frontend.o: In function `nrf_log_config_store':
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:1009: undefined reference to `__start_log_filter_data'
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:1009: undefined reference to `__stop_log_filter_data'
1> build/light_switch_client_nrf52832_xxAA_s132_6.1.0_Debug/obj/nrf_log_frontend.o: In function `nrf_log_config_load':
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:1047: undefined reference to `__start_log_filter_data'
1> D:/Nordic_original/nRF5_SDK_15.2.0_9412b96/examples/peripheral/flash_fds/pca10040/s132/ses/nrf_log_frontend.c:1047: undefined reference to `__stop_log_filter_data'
Build failed

And i couldn't find these variables in both projects

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