external_lib not compiling out of the box

[ahebbar09]

I am trying to get external_lib example application to compile for NRF5340pdk. I am using nRF Connect SDK v1.4.1 and picked the example provided in zepher/samples/application_development/external_lib. The code does not compile and does not seem to give any obvious errors. I am using a windows 10 PC for development. Do I need to do something more to get it to compile and run?

[Vidar Berg]

Hello,

Sorry for the delayed response. I tried building with both SES 5.10d and West in NCS 1.4.1, but I did not manage to replicate the build problem here, so I'm not really sure what the problem could be. Below is the build log I got for comparison.

C:\ncs\v1.4.1\zephyr\samples\application_development\external_lib>west build -b nrf5340pdk_nrf5340_cpuapp -p
-- west build: generating a build system
Including boilerplate (Zephyr base): C:/ncs/v1.4.1/zephyr/cmake/app/boilerplate.cmake
-- Application: C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib
-- Using NCS Toolchain 1.4.0 for building. (C:/ncs/v1.4.1/toolchain/cmake)
-- Zephyr version: 2.4.0 (C:/ncs/v1.4.1/zephyr)
-- Found Python3: C:/ncs/v1.4.1/toolchain/opt/bin/python.exe (found suitable exact version "3.8.2") found components:  Interpreter
-- Found west (found suitable version "0.7.2", minimum required is "0.7.1")
-- Board: nrf5340pdk_nrf5340_cpuapp
-- Cache files will be written to: C:/ncs/v1.4.1/zephyr/.cache
-- Found dtc: C:/ncs/v1.4.1/toolchain/opt/bin/dtc.exe (found suitable version "1.4.7", minimum required is "1.4.6")
-- Found toolchain: gnuarmemb (C:/ncs/v1.4.1/toolchain/opt)
-- Found BOARD.dts: C:/ncs/v1.4.1/zephyr/boards/arm/nrf5340dk_nrf5340/nrf5340pdk_nrf5340_cpuapp.dts
-- Generated zephyr.dts: C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build/zephyr/zephyr.dts
-- Generated devicetree_unfixed.h: C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build/zephyr/include/generated/devicetree_unfixed.h
Parsing C:/ncs/v1.4.1/zephyr/Kconfig
Loaded configuration 'C:/ncs/v1.4.1/zephyr/boards/arm/nrf5340dk_nrf5340/nrf5340pdk_nrf5340_cpuapp_defconfig'
Merged configuration 'C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/prj.conf'
Configuration saved to 'C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build/zephyr/.config'
Kconfig header saved to 'C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build/zephyr/include/generated/autoconf.h'
-- The C compiler identification is GNU 9.2.1
-- The CXX compiler identification is GNU 9.2.1
-- The ASM compiler identification is GNU
-- Found assembler: C:/ncs/v1.4.1/toolchain/opt/bin/arm-none-eabi-gcc.exe
-- Configuring done
-- Generating done
-- Build files have been written to: C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build
-- west build: building application
[6/144] Performing build step for 'mylib_project'
mkdir -p C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build/mylib/obj C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build/mylib/lib
C:/ncs/v1.4.1/toolchain/opt/bin/arm-none-eabi-gcc.exe -c -IC:/ncs/v1.4.1/zephyr/include -IC:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build/zephyr/include/generated -IC:/ncs/v1.4.1/zephyr/soc/arm/nordic_nrf/nrf53 -IC:/ncs/v1.4.1/zephyr/lib/libc/minimal/include -IC:/ncs/v1.4.1/nrf/include -IC:/ncs/v1.4.1/modules/hal/cmsis/CMSIS/Core/Include -IC:/ncs/v1.4.1/modules/hal/nordic/nrfx -IC:/ncs/v1.4.1/modules/hal/nordic/nrfx/drivers/include -IC:/ncs/v1.4.1/modules/hal/nordic/nrfx/mdk -IC:/ncs/v1.4.1/modules/hal/nordic/. -Ic:/users/vibe/ncs/v1.4.1/toolchain/opt/bin/../lib/gcc/arm-none-eabi/9.2.1/include -Ic:/users/vibe/ncs/v1.4.1/toolchain/opt/bin/../lib/gcc/arm-none-eabi/9.2.1/include-fixed -DKERNEL -D__ZEPHYR__=1 -D_FORTIFY_SOURCE=2 -DBUILD_VERSION=v2.4.0-ncs2 -DUSE_PARTITION_MANAGER=0 -D__PROGRAM_START -DNRF5340_XXAA_APPLICATION  -Os -imacros C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build/zephyr/include/generated/autoconf.h -ffreestanding -fno-common -g -mcpu=cortex-m33 -mthumb -mabi=aapcs -imacros C:/ncs/v1.4.1/zephyr/include/toolchain/zephyr_stdint.h -Wall -Wformat -Wformat-security -Wno-format-zero-length -Wno-main -Wno-pointer-sign -Wpointer-arith -Wno-address-of-packed-member -Wno-unused-but-set-variable -Werror=implicit-int -fno-asynchronous-unwind-tables -fno-pie -fno-pic -fno-strict-overflow -fno-reorder-functions -fno-defer-pop -fmacro-prefix-map=C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib=CMAKE_SOURCE_DIR -fmacro-prefix-map=C:/ncs/v1.4.1/zephyr=ZEPHYR_BASE -fmacro-prefix-map=C:/ncs/v1.4.1=WEST_TOPDIR -ffunction-sections -fdata-sections -std=c99 -nostdinc -isystemC:/ncs/v1.4.1/zephyr/lib/libc/minimal/include -isystemc:/users/vibe/ncs/v1.4.1/toolchain/opt/bin/../lib/gcc/arm-none-eabi/9.2.1/include -isystemc:/users/vibe/ncs/v1.4.1/toolchain/opt/bin/../lib/gcc/arm-none-eabi/9.2.1/include-fixed -MD -Iinclude src/mylib.c -o C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build/mylib/obj/mylib.o
C:/ncs/v1.4.1/toolchain/opt/bin/arm-none-eabi-ar.exe -rcs C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build/mylib/lib/libmylib.a C:/ncs/v1.4.1/zephyr/samples/application_development/external_lib/build/mylib/obj/mylib.o
[139/144] Linking C executable zephyr\zephyr_prebuilt.elf
Memory region         Used Size  Region Size  %age Used
           FLASH:       20788 B         1 MB      1.98%
            SRAM:        5648 B       448 KB      1.23%
        IDT_LIST:          56 B         2 KB      2.73%
[144/144] Linking C executable zephyr\zephyr.elf

If you are still getting this error, could you maybe try to install NCS v1.4.99-dev1 through the toolchain manager and see if it gives you the same result?