undefined reference to `nrf_pwr_mgmt_init

Question

hello, 
 i am using the Nrf52840 , SDK version 15 with segger embedded studio. 
 i am developing simple application but i got this issue. i already add the reference in the following location 
 project-> edit option -> common-> Preprocessor-> user includes dic. 
 i already used some custom library which is working fine but not power management library. 
 
 .c file is also included. the error is coming from the linker 
 
 here is the output

Fullscreen 
 error_code.txt 
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 Building ‘SmartID’ from solution ‘SmartID’ in configuration ‘Debug’
1> 'Output/SmartID Debug/Obj/thumb_crt0.o' is up to date
2> 'Output/SmartID Debug/Obj/main.o' is up to date
3> 'Output/SmartID Debug/Obj/boards.o' is up to date
1> 'Output/SmartID Debug/Obj/app_error_handler_gcc.o' is up to date
2> 'Output/SmartID Debug/Obj/app_error_weak.o' is up to date
1> 'Output/SmartID Debug/Obj/app_error.o' is up to date
4> 'Output/SmartID Debug/Obj/app_timer.o' is up to date
1> 'Output/SmartID Debug/Obj/app_util_platform.o' is up to date
2> 'Output/SmartID Debug/Obj/ble_conn_state.o' is up to date
1> 'Output/SmartID Debug/Obj/nrf_assert.o' is up to date
3> 'Output/SmartID Debug/Obj/nrf_atflags.o' is up to date
1> 'Output/SmartID Debug/Obj/nrf_atomic.o' is up to date
2> 'Output/SmartID Debug/Obj/nrf_balloc.o' is up to date
1> 'Output/SmartID Debug/Obj/nrf_memobj.o' is up to date
1> 'Output/SmartID Debug/Obj/nrf_section_iter.o' is up to date
2> 'Output/SmartID Debug/Obj/nrf_strerror.o' is up to date
1> 'Output/SmartID Debug/Obj/nrfx_twim.o' is up to date
3> 'Output/SmartID Debug/Obj/nrf_pwr_mgmt.o' is up to date
1> 'Output/SmartID Debug/Obj/ses_nRF_Startup.o' is up to date
2> 'Output/SmartID Debug/Obj/ses_nrf52840_Vectors.o' is up to date
1> 'Output/SmartID Debug/Obj/system_nrf52840.o' is up to date
4> 'Output/SmartID Debug/Obj/ble_advdata.o' is up to date
1> 'Output/SmartID Debug/Obj/nrfx_twi.o' is up to date
2> 'Output/SmartID Debug/Obj/nrf_drv_twi.o' is up to date
1> 'Output/SmartID Debug/Obj/nrf_sdh_ble.o' is up to date
3> 'Output/SmartID Debug/Obj/nrf_sdh.o' is up to date
1> 'Output/SmartID Debug/Obj/nrf_log_frontend.o' is up to date
2> 'Output/SmartID Debug/Obj/nrf_log_backend_rtt.o' is up to date
1> 'Output/SmartID Debug/Obj/nrf_log_backend_serial.o' is up to date
1> 'Output/SmartID Debug/Obj/nrf_log_backend_uart.o' is up to date
2> 'Output/SmartID Debug/Obj/nrf_log_default_backends.o' is up to date
1> 'Output/SmartID Debug/Obj/nrf_log_str_formatter.o' is up to date
3> 'Output/SmartID Debug/Obj/nrf_fprintf.o' is up to date
1> 'Output/SmartID Debug/Obj/nrf_fprintf_format.o' is up to date
2> 'Output/SmartID Debug/Obj/SEGGER_RTT_printf.o' is up to date
1> 'Output/SmartID Debug/Obj/SEGGER_RTT_Syscalls_SES.o' is up to date
4> 'Output/SmartID Debug/Obj/SEGGER_RTT.o' is up to date
1> Output/Debug/Exe/SmartID.elf does not exist.
1> Generating linker script ‘SmartID.ld’
1> "/Applications/SEGGER Embedded Studio for ARM 3.34/bin/mkld" -memory-map-segments "FLASH RX 0x0 0x100000;RAM RWX 0x20000000 0x40000" -section-placement-file /Users/atifshabbir/Development/Projects/SmartID/Project_File/flash_placement.xml -check-segment-overflow -symbols __STACKSIZE__=8192;__STACKSIZE_PROCESS__=0;__STACKSIZE_IRQ__=0;__STACKSIZE_FIQ__=0;__STACKSIZE_SVC__=0;__STACKSIZE_ABT__=0;__STACKSIZE_UND__=0;__HEAPSIZE__=8192 -section-placement-macros FLASH_PH_START=0x0;FLASH_PH_SIZE=0x100000;RAM_PH_START=0x20000000;RAM_PH_SIZE=0x40000;FLASH_START=0x26000;FLASH_SIZE=0xda000;RAM_START=0x20001d70;RAM_SIZE=0x3e290 "/Users/atifshabbir/Development/Projects/SmartID/Project_File/Output/SmartID Debug/Obj/SmartID.ld"
1> Linking SmartID.elf
1> "/Applications/SEGGER Embedded Studio for ARM 3.34/gcc/arm-none-eabi/bin/ld" -X -eReset_Handler --omagic -defsym=__vfprintf=__vfprintf_long -defsym=__vfscanf=__vfscanf_int -EL --gc-sections "-T/Users/atifshabbir/Development/Projects/SmartID/Project_File/Output/SmartID Debug/Obj/SmartID.ld" -Map Output/Debug/Exe/SmartID.map -u_vectors -o Output/Debug/Exe/SmartID.elf --emit-relocs "@/Users/atifshabbir/Development/Projects/SmartID/Project_File/Output/SmartID Debug/Obj/SmartID.ind"
1> Output/SmartID Debug/Obj/main.o: In function `power_management_init()':
1> /Users/atifshabbir/Development/Projects/SmartID/main/main.cpp:237: undefined reference to `nrf_pwr_mgmt_init()'
1> Output/SmartID Debug/Obj/main.o: In function `idle_state_handle()':
1> /Users/atifshabbir/Development/Projects/SmartID/main/main.cpp:244: undefined reference to `nrf_pwr_mgmt_run()'
Build failed

thank you

tkstreet · Accepted Answer

So, my guess is that the problem is you are compiling this in a C++ file. The C++ compiler likely is doing name-mangling with some overrides. I tried renaming the file to a C file and it compiled. If you have C++ code that prevents you from renaming your file to .c, you can enclose everything in an extern block: 
 
 #ifdef __cplusplus
extern "C"{
#endif


/*
 * Your code
 */


#ifdef __cplusplus
}
#endif 
 It should be able to find it after doing that.

undefined reference to `nrf_pwr_mgmt_init

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