https://devzone.nordicsemi.com/f/nordic-q-a/30591/linking-error-eclipse-with-armgcc-toolchainThe current configuration looks as follows: IDE: Eclipse Toolchain: ARMGCC SDK: SDK5_NRF_14 DK: NRF52DK-PCA10040 I am trying to port the &#39;bootloader_secure_ble&#39; to the bootloader section of a project. The bootloader (currently non-dfu) usesen-USTelligent Community 13Tue, 20 Feb 2018 10:18:55 GMThttps://devzone.nordicsemi.com/thread/121372?ContentTypeID=1Tue, 20 Feb 2018 10:18:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:735d75fe-a142-44ee-84cd-f49e0215dad0atharva<p>Thanks for that. The solution now seems relatively simple, but it was a bit of a task to resolve all dependencies&nbsp;keeping one eye on the size and given the fact that these errors are encountered only during linking. Also what complicated the process was highly customized nature of the makefile and the linker. Also, yes&nbsp;on the DEBUG flag.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/121354?ContentTypeID=1Tue, 20 Feb 2018 09:09:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f5d4b60f-73b8-42a6-b17e-9bbe21d946ffMartinBL<p>Looks like there are some .c files missing in your makefile.&nbsp;app_error_save_and_stop() for example, is included in app_error.c. Have you included this? The other two functions that seem to be undefined are located in&nbsp;nrf_dfu_req_handler.c.&nbsp;</p> <p>Have you defined DEBUG in your C flags? As far as I can see,&nbsp;<span>app_error_save_and_stop() shouldn&#39;t be required without it.&nbsp;</span></p><div style="clear:both;"></div>