hello_world fails to build for rpi_pico2

[samblenny]

Describe the bug

west build -p always -b rpi_pico2/rp2350a/m33 samples/hello_world fails during linking.

Error messages include:

• "FAILED: zephyr/zephyr_pre0.elf zephyr/zephyr_pre0.map /home/sam/code/zephyr-workspace/zephyr/build/zephyr/zephyr_pre0.map"
• "...conflicting CPU architectures 17/2"
• "...failed to merge target specific data of file..."

(see console log section below for additional details)

I get similar errors if I attempt to build other samples including samples/basic/blinky and samples/basic/minimal.

Target platform: Raspberry Pi Pico 2

Diagnosis: Searching for similar error messages comes up with discussions of an ABI mismatch between code compiled with ARM soft floating point and hard floating point.

I do not know if this is a regression or not.

To Reproduce

1. Prepare Zephyr workspace with zephyr commit d3d7e18 and zephyr-sdk-0.17.0
2. cd zephyr
3. west build -p always -b rpi_pico2/rp2350a/m33 samples/hello_world

Expected behavior

The west build ... command should finish without errors.

Impact

It may be the case that building anything for rpi_pico2 is currently broken?

Logs and console output

(.venv) $ west build -p always -b rpi_pico2/rp2350a/m33 samples/hello_world
-- west build: making build dir /home/sam/code/zephyr-workspace/zephyr/build pristine
-- west build: generating a build system
Loading Zephyr default modules (Zephyr base).
-- Application: /home/sam/code/zephyr-workspace/zephyr/samples/hello_world
-- CMake version: 3.25.1
-- Found Python3: /home/sam/code/zephyr-workspace/.venv/bin/python3 (found suitable version "3.11.2", minimum required is "3.10") found components: Interpreter 
-- Cache files will be written to: /home/sam/.cache/zephyr
-- Zephyr version: 4.0.99 (/home/sam/code/zephyr-workspace/zephyr)
-- Found west (found suitable version "1.3.0", minimum required is "0.14.0")
-- Board: rpi_pico2, qualifiers: rp2350a/m33
-- ZEPHYR_TOOLCHAIN_VARIANT not set, trying to locate Zephyr SDK
-- Found host-tools: zephyr 0.17.0 (/home/sam/zephyr-sdk-0.17.0)
-- Found toolchain: zephyr 0.17.0 (/home/sam/zephyr-sdk-0.17.0)
-- Found Dtc: /home/sam/zephyr-sdk-0.17.0/sysroots/x86_64-pokysdk-linux/usr/bin/dtc (found suitable version "1.6.0", minimum required is "1.4.6") 
-- Found BOARD.dts: /home/sam/code/zephyr-workspace/zephyr/boards/raspberrypi/rpi_pico2/rpi_pico2_rp2350a_m33.dts
-- Generated zephyr.dts: /home/sam/code/zephyr-workspace/zephyr/build/zephyr/zephyr.dts
-- Generated pickled edt: /home/sam/code/zephyr-workspace/zephyr/build/zephyr/edt.pickle
-- Generated devicetree_generated.h: /home/sam/code/zephyr-workspace/zephyr/build/zephyr/include/generated/zephyr/devicetree_generated.h
-- Including generated dts.cmake file: /home/sam/code/zephyr-workspace/zephyr/build/zephyr/dts.cmake
Parsing /home/sam/code/zephyr-workspace/zephyr/Kconfig
Loaded configuration '/home/sam/code/zephyr-workspace/zephyr/boards/raspberrypi/rpi_pico2/rpi_pico2_rp2350a_m33_defconfig'
Merged configuration '/home/sam/code/zephyr-workspace/zephyr/samples/hello_world/prj.conf'
Configuration saved to '/home/sam/code/zephyr-workspace/zephyr/build/zephyr/.config'
Kconfig header saved to '/home/sam/code/zephyr-workspace/zephyr/build/zephyr/include/generated/zephyr/autoconf.h'
-- Found GnuLd: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/arm-zephyr-eabi/bin/ld.bfd (found version "2.38") 
-- The C compiler identification is GNU 12.2.0
-- The CXX compiler identification is GNU 12.2.0
-- The ASM compiler identification is GNU
-- Found assembler: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc
-- Using ccache: /usr/bin/ccache
-- Configuring done
-- Generating done
-- Build files have been written to: /home/sam/code/zephyr-workspace/zephyr/build
-- west build: building application
[1/138] Preparing syscall dependency handling

[2/138] Generating include/generated/zephyr/version.h
-- Zephyr version: 4.0.99 (/home/sam/code/zephyr-workspace/zephyr), build: d3d7e185babb
[133/138] Linking C executable zephyr/zephyr_pre0.elf
FAILED: zephyr/zephyr_pre0.elf zephyr/zephyr_pre0.map /home/sam/code/zephyr-workspace/zephyr/build/zephyr/zephyr_pre0.map 
: && ccache /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc  -gdwarf-4 zephyr/CMakeFiles/zephyr_pre0.dir/misc/empty_file.c.obj -o zephyr/zephyr_pre0.elf  zephyr/CMakeFiles/offsets.dir/./arch/arm/core/offsets/offsets.c.obj  -T  zephyr/linker_zephyr_pre0.cmd  -Wl,-Map=/home/sam/code/zephyr-workspace/zephyr/build/zephyr/zephyr_pre0.map  -Wl,--whole-archive  app/libapp.a  zephyr/libzephyr.a  zephyr/arch/common/libarch__common.a  zephyr/arch/arch/arm/core/libarch__arm__core.a  zephyr/arch/arch/arm/core/cortex_m/libarch__arm__core__cortex_m.a  zephyr/arch/arch/arm/core/cortex_m/cmse/libarch__arm__core__cortex_m__cmse.a  zephyr/lib/libc/picolibc/liblib__libc__picolibc.a  zephyr/lib/libc/common/liblib__libc__common.a  zephyr/soc/soc/rp2350a/rp2350/libsoc__raspberrypi__rpi_pico__rp2350.a  zephyr/drivers/clock_control/libdrivers__clock_control.a  zephyr/drivers/console/libdrivers__console.a  zephyr/drivers/gpio/libdrivers__gpio.a  zephyr/drivers/pinctrl/libdrivers__pinctrl.a  zephyr/drivers/reset/libdrivers__reset.a  zephyr/drivers/serial/libdrivers__serial.a  zephyr/drivers/timer/libdrivers__timer.a  modules/hal_rpi_pico/libmodules__hal_rpi_pico.a  -Wl,--no-whole-archive  zephyr/kernel/libkernel.a  -L/home/sam/code/zephyr-workspace/zephyr/build/zephyr  zephyr/arch/common/libisr_tables.a  -Wl,--gc-sections  -Wl,--build-id=none  -Wl,--sort-common=descending  -Wl,--sort-section=alignment  -Wl,-u,_OffsetAbsSyms  -Wl,-u,_ConfigAbsSyms  -nostdlib  -static  -Wl,-X  -Wl,-N  -Wl,--orphan-handling=warn  -Wl,-no-pie  -specs=picolibc.specs  -DPICOLIBC_LONG_LONG_PRINTF_SCANF -L"/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/thumb/v8-m.main/nofp" -lc -lgcc && cd /home/sam/code/zephyr-workspace/zephyr/build/zephyr && /usr/bin/cmake -E true
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strcmp.S.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strcmp.S.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(memcpy.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(memcpy.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(memset.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(memset.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strlen.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strlen.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_errno_errno.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_errno_errno.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_string_strnlen.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_string_strnlen.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_printf.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_printf.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_puts.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_puts.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_vflprintf.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_vflprintf.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_vflscanf.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_vflscanf.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_vprintf.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_vprintf.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_string_strchr.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_string_strchr.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_fgetc.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_fgetc.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_ungetc.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_ungetc.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_compare_exchange.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_compare_exchange.c.o)
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: error: /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_exchange.c.o): conflicting CPU architectures 17/2
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld: failed to merge target specific data of file /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(libc_tinystdio_exchange.c.o)
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
FATAL ERROR: command exited with status 1: /usr/bin/cmake --build /home/sam/code/zephyr-workspace/zephyr/build

Environment (please complete the following information):

• OS: Linux (Debian 12)
• Toolchain: zephyr-sdk-0.17.0
• Commit: d3d7e18

Additional context

For comparison, when I build for the Pi Pico with west build -p always -b rpi_pico samples/hello_world, it works fine.

[samblenny]

I'm not an expert on tracking down this type of error, so I may be off the mark here. But, from what I can tell, the first error,

...picolibc/arm-zephyr-eabi/lib/./libc.a(strcmp.S.o): conflicting CPU architectures 17/2

is probably happening as a result of trying to link these two files:

• zephyr/kernel/libkernel.a
• zephyr-sdk-0.17.0/arm-zephyr-eabi/picolibc/arm-zephyr-eabi/lib/libc.a

I say that because, if I use grep to look for strcmp in build/zephyr/zephyr_pre0.map, I get this:

(.venv) $ grep strcmp build/zephyr/zephyr_pre0.map 
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strcmp.S.o)
                              zephyr/kernel/libkernel.a(device.c.obj) (strcmp)
 .text          0x0000000000000000       0x1c /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strcmp.S.o)
 .data          0x0000000000000000        0x0 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strcmp.S.o)
 .bss           0x0000000000000000        0x0 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strcmp.S.o)
 .ARM.extab     0x0000000000000000        0x0 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strcmp.S.o)
 .ARM.exidx     0x0000000000000000        0x8 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strcmp.S.o)
 .debug_frame   0x0000000000000000       0x20 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strcmp.S.o)
                0x000000000000109a       0x1a /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/./libc.a(strcmp.S.o)

When I use objdump to look at the picolibc file from the zephyr-sdk-0.17.0/arm-zephyr-eabi toolchain, I see it appears to have been compiled for armv4t:

(.venv) $ ~/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/arm-zephyr-eabi-objdump -f \
    ~/zephyr-sdk-0.17.0/arm-zephyr-eabi/picolibc/arm-zephyr-eabi/lib/libc.a | grep -A 4 strcmp.S.o
strcmp.S.o:     file format elf32-littlearm
architecture: armv4t, flags 0x00000011:
HAS_RELOC, HAS_SYMS
start address 0x00000000

When I look at libkernel.a, it seems to have been built for armv8-m.main

(.venv) $ ~/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/arm-zephyr-eabi-objdump -f \
    build/zephyr/kernel/libkernel.a | head -n 6
In archive build/zephyr/kernel/libkernel.a:

main_weak.c.obj:     file format elf32-littlearm
architecture: armv8-m.main, flags 0x00000011:
HAS_RELOC, HAS_SYMS
start address 0x00000000

[samblenny]

If I build for Pi Pico, which links successfully, the architecture in build/zephyr/kernel/libkernel.a is armv6s-m:

(.venv) $ rm -r build/
(.venv) $ west build -p always -b rpi_pico samples/hello_world
...
(.venv) $ ~/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/arm-zephyr-eabi-objdump -f build/zephyr/kernel/libkernel.a | head -n 6
In archive build/zephyr/kernel/libkernel.a:

main_weak.c.obj:     file format elf32-littlearm
architecture: armv6s-m, flags 0x00000011:
HAS_RELOC, HAS_SYMS
start address 0x00000000

[samblenny]

Maybe the problem is that west build is trying to link Cortex-M33 code for the Pico2 against the armv4t picolibc library that comes with zephyr-sdk-0.17.0/arm-zephyr-eabi. Perhaps it should instead build picolibc from source using the picolibc module?

[samblenny]

If I turn on CONFIG_PICOLIBC_USE_MODULE, the hello_world sample builds successfully for rpi_pico2, like this:

(.venv) $ west build -p always -b rpi_pico2/rp2350a/m33 samples/hello_world -- -DCONFIG_PICOLIBC_USE_MODULE=y
...[irrelevant stuff edited out]...
-- west build: building application
[1/1095] Preparing syscall dependency handling

[6/1095] Generating include/generated/zephyr/version.h
-- Zephyr version: 4.0.99 (/home/sam/code/zephyr-workspace/zephyr), build: v4.0.0-4610-gb7cfa54c1837
[1095/1095] Linking C executable zephyr/zephyr.elf
Memory region         Used Size  Region Size  %age Used
 IMAGE_DEF_FLASH:          28 B        128 B     21.88%
           FLASH:       15716 B    4194048 B      0.37%
             RAM:        3968 B       520 KB      0.75%
        IDT_LIST:          0 GB        32 KB      0.00%
Generating files from /home/sam/code/zephyr-workspace/zephyr/build/zephyr/zephyr.elf for board: rpi_pico2
Converted to uf2, output size: 32256, start address: 0x10000000
Wrote 32256 bytes to zephyr.uf2

[xudongzheng]

Did you upgrade your Zephyr SDK recently?

The error message seems quite similar to zephyrproject-rtos/sdk-ng#854, which was resolved with rm -rf ~/.cache.

[samblenny]

Did you upgrade your Zephyr SDK recently?

No. For the development machine I've been using, 0.17.0 was the first and only Zephyr SDK version that I've installed. But, I did initially install the full SDK with all toolchains, delete that, and then switch to the minimal SDK with only the specific toolchains that I needed.

The error message seems quite similar to zephyrproject-rtos/sdk-ng#854, which was resolved with rm -rf ~/.cache.

Hmm... deleting the cache helps. When I tried this, the build worked:

rm -r ~/.cache/zephyr
rm -r build
west build -p always -b rpi_pico2/rp2350a/m33 samples/hello_world

This time, when I grep the map file for strcmp, it's looking in zephyr-sdk-0.17.0/arm-zephyr-eabi/picolibc/arm-zephyr-eabi/lib/thumb/v8-m.main/nofp/libc.a:

(.venv) $ grep strcmp build/zephyr/zephyr_pre0.map
/home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/thumb/v8-m.main/nofp/libc.a(strcmp.S.o)
                              zephyr/kernel/libkernel.a(device.c.obj) (strcmp)
 .text          0x0000000000000000       0x14 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/thumb/v8-m.main/nofp/libc.a(strcmp.S.o)
 .data          0x0000000000000000        0x0 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/thumb/v8-m.main/nofp/libc.a(strcmp.S.o)
 .bss           0x0000000000000000        0x0 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/thumb/v8-m.main/nofp/libc.a(strcmp.S.o)
 .ARM.extab     0x0000000000000000        0x0 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/thumb/v8-m.main/nofp/libc.a(strcmp.S.o)
 .ARM.exidx     0x0000000000000000        0x8 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/thumb/v8-m.main/nofp/libc.a(strcmp.S.o)
 .debug_frame   0x0000000000000000       0x20 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/thumb/v8-m.main/nofp/libc.a(strcmp.S.o)
                0x000000000000109a       0x20 /home/sam/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/../lib/gcc/../../picolibc/arm-zephyr-eabi/lib/thumb/v8-m.main/nofp/libc.a(strcmp.S.o)

[WilliamGFish]

Hello_world is not compiling for the RPi_Pico/rp2040/w...failure in 'sys_rand_get'

[soburi]

@WilliamGFish

Hello_world is not compiling for the RPi_Pico/rp2040/w...failure in 'sys_rand_get'

I've checked, and there are no issues.
Please create a new issue if necessary.

[github-actions]

This issue has been marked as stale because it has been open (more than) 60 days with no activity. Remove the stale label or add a comment saying that you would like to have the label removed otherwise this issue will automatically be closed in 14 days. Note, that you can always re-open a closed issue at any time.