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linker issue, undefined reference

ChrisRu

Hi,

just start with SEGGER Embedded and use a usb acm to setup my target

to have a clean structure I moved code from main.c to dedicated files have the USB and BSP

I create new folder in the SEGGER and add the new files. They get compiled and no warnings
But the link failed

3> Compiling 'bsphandler.c'
4> Compiling 'usbhandler.c'

1> /usr/share/segger_embedded_studio_for_arm_5.20/gcc/arm-none-eabi/bin/
ld: Output/Debug/Obj/nRFGeofence_pca10056/main.o:(.rodata.m_app_cdc_acm+0x1c):
undefined reference to `cdc_acm_user_ev_handler'
1> /usr/share/segger_embedded_studio_for_arm_5.20/gcc/arm-none-eabi/bin/ld: Output/Debug/Obj/nRFGeofence_pca10056/main.o: in function `init_cli':
1> /home/chris/devel/RF52/nRF5_SDK_17.0.2_d674dde/examples/gtsys/nRFGeofence/main.c:91: undefined reference to `bsp_event_callback'
1> /usr/share/segger_embedded_studio_for_arm_5.20/gcc/arm-none-eabi/bin/ld: Output/Debug/Obj/nRFGeofence_pca10056/main.o: in function `main':
1> /home/chris/devel/RF52/nRF5_SDK_17.0.2_d674dde/examples/gtsys/nRFGeofence/main.c:117: undefined reference to `init_bsp'
1> /usr/share/segger_embedded_studio_for_arm_5.20/gcc/arm-none-eabi/bin/ld: Output/Debug/Obj/nRFGeofence_pca10056/main.o:(.rodata.usbd_config.15191+0x4): undefined reference to `usbd_user_ev_handler'

the static functions for cdc_acm_user_ev_handler move from main.c to usbhandler.c

Where is the hint? Why does the linker hasn't usbhandler.o used?

I running the development on a x64 Linux machine, no! I do not have Windows.

Some helpful tips needed.

Regards
Chris

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  • 0

    Hi Simon,

    I used the SEGGER native method to add new files,
    1st) add a Folder 'Implementation'
    2nd) add new files to the folder bsphandler.c usbhandler.c
    3rd) move static functions from main.c to bsphander.c & usbhandler.c add the definitions to header files
    bsphandler.h & usbhandler.h  and use #include directive in main to make them
    available for the Compile process.

    Both objects are in the projects output directory. (xxxhandler.o)

    My missing link is, where to add so that the linker will use them in the SEGGER Embedded environment.
    They got compiled but the linker does not inherit them.

    -Chris

Reply
  • 0

    Hi Simon,

    I used the SEGGER native method to add new files,
    1st) add a Folder 'Implementation'
    2nd) add new files to the folder bsphandler.c usbhandler.c
    3rd) move static functions from main.c to bsphander.c & usbhandler.c add the definitions to header files
    bsphandler.h & usbhandler.h  and use #include directive in main to make them
    available for the Compile process.

    Both objects are in the projects output directory. (xxxhandler.o)

    My missing link is, where to add so that the linker will use them in the SEGGER Embedded environment.
    They got compiled but the linker does not inherit them.

    -Chris

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