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Request for RISCV LLVM compiler option in SDK #2228

Open
matsobdev opened this issue Feb 3, 2025 · 2 comments
Open

Request for RISCV LLVM compiler option in SDK #2228

matsobdev opened this issue Feb 3, 2025 · 2 comments
Milestone
2.2.0

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@matsobdev
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matsobdev commented Feb 3, 2025 •
edited
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because... why not :D But messing with scripts and hardcoding, and deleting stuff, managed to compile some program that works. There was some warnings and SDK required some changes. Stable release and top-of-tree both has RISCV LLVM option. Latter one has newer 19.0.0 (and it's GCC/LLVM combo), and it works with -march=rv32ima_zicsr_zifencei_zba_zbb_zbs_zbkb_zca_zcb_zcmp, that is required after changing instruction:

pico-sdk/src/rp2_common/hardware_irq/irq_handler_chain.S

Line 75 in 95ea6ac

.insn 0xb842 // cm.push {ra}, -16: Save ultimate return address

and

pico-sdk/src/rp2_common/hardware_irq/irq_handler_chain.S

Line 91 in 95ea6ac

.insn 0xbe42 // cm.popret {ra}, 16

to its commented out form. Stable (16 something) was not complying with rv32imac_zicsr_zifencei_zba_zbb_zbs_zbkb. They both are shipped with newlib so set(PICO_CLIB newlib). Pico 2 W has similar instruction incompatibility somewhere in cyw43driver I believe, but there was not comment for that :D So deleting it, and it compiled spiting out uf2 file. I don't have Pico 2 W to test it, but I bet it might lack one instruction. I didn't dig deep enough for the replacement. Anyway, compiler is available (for Linux and macOS only in a binary form) and at the first glance it works.

PICO_SDK_PATH is /home/mateush/Dysk_RAM/pico-sdk-2.1.0
Target board (PICO_BOARD) is 'pico2'.
Using board configuration from /home/mateush/Dysk_RAM/pico-sdk-2.1.0/src/boards/include/boards/pico2.h
Pico Platform (PICO_PLATFORM) is 'rp2350-riscv'.
Configuring toolchain based on PICO_COMPILER 'pico_riscv_clang'
-- The C compiler identification is Clang 19.0.0
-- The CXX compiler identification is Clang 19.0.0
-- The ASM compiler identification is Clang
-- Found assembler: /media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/riscv32-unknown-elf-clang
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/riscv32-unknown-elf-clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/riscv32-unknown-elf-clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
Build type is Release
-- Found Python3: /usr/bin/python3.8 (found version "3.8.10") found components: Interpreter 
TinyUSB available at /home/mateush/Dysk_RAM/pico-sdk-2.1.0/lib/tinyusb/src/portable/raspberrypi/rp2040; enabling build support for USB.
BTstack available at /home/mateush/Dysk_RAM/pico-sdk-2.1.0/lib/btstack
cyw43-driver available at /home/mateush/Dysk_RAM/pico-sdk-2.1.0/lib/cyw43-driver
lwIP available at /home/mateush/Dysk_RAM/pico-sdk-2.1.0/lib/lwip
mbedtls available at /home/mateush/Dysk_RAM/pico-sdk-2.1.0/lib/mbedtls
-- Configuring done
-- Generating done
-- Build files have been written to: /home/mateush/Dysk_RAM/hid_kbd_fix_LSM6DS3_a_s_RP2350_master/build
[2/58] Linking ASM executable pico-sdk/src/rp2350/boot_stage2/bs2_default.elf
Memory region         Used Size  Region Size  %age Used
            SRAM:         174 B        252 B     69.05%
[51/58] Building ASM object CMakeFiles...rc/rp2_common/pico_crt0/crt0_riscv.S.o
/tmp/crt0_riscv-9d7bc4.s:113:1: warning: isr_riscv_machine_external_irq changed binding to STB_WEAK
.weak isr_riscv_machine_external_irq
^
[58/58] Linking CXX executable hog_kbd.elf
GNU ld ('riscv-embecosm-embedded-ubuntu2004-20240407') 2.42.50.20240407
GNU ld ('riscv-embecosm-embedded-ubuntu2004-20240407') 2.42.50.20240407
  Supported emulations:
   elf32lriscv
   elf64lriscv
   elf32briscv
   elf64briscv
otwarto plik skryptowy /home/mateush/Dysk_RAM/pico-sdk-2.1.0/src/rp2_common/pico_crt0/rp2350/memmap_no_flash.ld
using external linker script:
==================================================
/* Based on GCC ARM embedded samples.
   Defines the following symbols for use by code:
    __exidx_start
    __exidx_end
    __etext
    __data_start__
    __preinit_array_start
    __preinit_array_end
    __init_array_start
    __init_array_end
    __fini_array_start
    __fini_array_end
    __data_end__
    __bss_start__
    __bss_end__
    __end__
    end
    __HeapLimit
    __StackLimit
    __StackTop
    __stack (== StackTop)
*/

MEMORY
{
    RAM(rwx) : ORIGIN =  0x20000000, LENGTH = 512k
    SCRATCH_X(rwx) : ORIGIN = 0x20080000, LENGTH = 4k
    SCRATCH_Y(rwx) : ORIGIN = 0x20081000, LENGTH = 4k
}

ENTRY(_entry_point)

SECTIONS
{
    /* Note unlike RP2040, we start the image with a vector table even for
       NO_FLASH builds. On Arm, the bootrom expects a VT at the start of the
       image by default; on RISC-V, the default is to enter the image at its
       lowest address, so an IMAGEDEF item is required to specify the
       nondefault entry point. */

    .text : {
        __logical_binary_start = .;
        /* Vectors require 512-byte alignment on v8-M when >48 IRQs are used,
           so we would waste RAM if the vector table were not at the
           start. */
        KEEP (*(.vectors))
        KEEP (*(.binary_info_header))
        __binary_info_header_end = .;
        KEEP (*(.embedded_block))
        __embedded_block_end = .;
        __reset_start = .;
        KEEP (*(.reset))
        __reset_end = .;
        *(.time_critical*)
        *(.text*)
        . = ALIGN(4);
        *(.init)
        *(.fini)
        /* Pull all c'tors into .text */
        *crtbegin.o(.ctors)
        *crtbegin?.o(.ctors)
        *(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
        *(SORT(.ctors.*))
        *(.ctors)
        /* Followed by destructors */
        *crtbegin.o(.dtors)
        *crtbegin?.o(.dtors)
        *(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
        *(SORT(.dtors.*))
        *(.dtors)

        *(.eh_frame*)
    } > RAM

    .rodata : {
        . = ALIGN(4);
        *(.rodata*)
        *(.srodata*)
        . = ALIGN(4);
        *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.flashdata*)))
        . = ALIGN(4);
    } > RAM

    .ARM.extab :
    {
        *(.ARM.extab* .gnu.linkonce.armextab.*)
    } > RAM

    __exidx_start = .;
    .ARM.exidx :
    {
        *(.ARM.exidx* .gnu.linkonce.armexidx.*)
    } > RAM
    __exidx_end = .;

    /* Machine inspectable binary information */
    . = ALIGN(4);
    __binary_info_start = .;
    .binary_info :
    {
        KEEP(*(.binary_info.keep.*))
        *(.binary_info.*)
    } > RAM
    __binary_info_end = .;
    . = ALIGN(4);

    .data : {
        __data_start__ = .;
        *(vtable)
        *(.data*)
        *(.sdata*)

        . = ALIGN(4);
        *(.after_data.*)
        . = ALIGN(4);
        /* preinit data */
        PROVIDE_HIDDEN (__mutex_array_start = .);
        KEEP(*(SORT(.mutex_array.*)))
        KEEP(*(.mutex_array))
        PROVIDE_HIDDEN (__mutex_array_end = .);

        . = ALIGN(4);
        /* preinit data */
        PROVIDE_HIDDEN (__preinit_array_start = .);
        KEEP(*(SORT(.preinit_array.*)))
        KEEP(*(.preinit_array))
        PROVIDE_HIDDEN (__preinit_array_end = .);

        . = ALIGN(4);
        /* init data */
        PROVIDE_HIDDEN (__init_array_start = .);
        KEEP(*(SORT(.init_array.*)))
        KEEP(*(.init_array))
        PROVIDE_HIDDEN (__init_array_end = .);

        . = ALIGN(4);
        /* finit data */
        PROVIDE_HIDDEN (__fini_array_start = .);
        *(SORT(.fini_array.*))
        *(.fini_array)
        PROVIDE_HIDDEN (__fini_array_end = .);

        *(.jcr)
        . = ALIGN(4);
   } > RAM

    .tdata : {
        . = ALIGN(4);
		*(.tdata .tdata.* .gnu.linkonce.td.*)
        /* All data end */
        __tdata_end = .;
    } > RAM
    PROVIDE(__data_end__ = .);

    .uninitialized_data (NOLOAD): {
        . = ALIGN(4);
        *(.uninitialized_data*)
    } > RAM
    /* __etext is (for backwards compatibility) the name of the .data init source pointer (...) */
    __etext = LOADADDR(.data);

    .tbss (NOLOAD) : {
        . = ALIGN(4);
        __bss_start__ = .;
        __tls_base = .;
        *(.tbss .tbss.* .gnu.linkonce.tb.*)
        *(.tcommon)

        __tls_end = .;
    } > RAM

    .bss (NOLOAD) : {
        . = ALIGN(4);
        __tbss_end = .;

        *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.bss*)))
        *(COMMON)
        PROVIDE(__global_pointer$ = . + 2K);
        *(.sbss*)
        . = ALIGN(4);
        __bss_end__ = .;
    } > RAM

    .heap (NOLOAD):
    {
        __end__ = .;
        end = __end__;
        KEEP(*(.heap*))
    } > RAM
    /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
       to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
    __HeapLimit = ORIGIN(RAM) + LENGTH(RAM);

    /* Start and end symbols must be word-aligned */
    .scratch_x : {
        __scratch_x_start__ = .;
        *(.scratch_x.*)
        . = ALIGN(4);
        __scratch_x_end__ = .;
    } > SCRATCH_X
    __scratch_x_source__ = LOADADDR(.scratch_x);

    .scratch_y : {
        __scratch_y_start__ = .;
        *(.scratch_y.*)
        . = ALIGN(4);
        __scratch_y_end__ = .;
    } > SCRATCH_Y
    __scratch_y_source__ = LOADADDR(.scratch_y);

    /* .stack*_dummy section doesn't contains any symbols. It is only
     * used for linker to calculate size of stack sections, and assign
     * values to stack symbols later
     *
     * stack1 section may be empty/missing if platform_launch_core1 is not used */

    /* by default we put core 0 stack at the end of scratch Y, so that if core 1
     * stack is not used then all of SCRATCH_X is free.
     */
    .stack1_dummy (NOLOAD):
    {
        *(.stack1*)
    } > SCRATCH_X
    .stack_dummy (NOLOAD):
    {
        KEEP(*(.stack*))
    } > SCRATCH_Y

    /* stack limit is poorly named, but historically is maximum heap ptr */
    __StackLimit = ORIGIN(RAM) + LENGTH(RAM);
    __StackOneTop = ORIGIN(SCRATCH_X) + LENGTH(SCRATCH_X);
    __StackTop = ORIGIN(SCRATCH_Y) + LENGTH(SCRATCH_Y);
    __StackOneBottom = __StackOneTop - SIZEOF(.stack1_dummy);
    __StackBottom = __StackTop - SIZEOF(.stack_dummy);
    PROVIDE(__stack = __StackTop);

    /* picolibc and LLVM */
    PROVIDE (__heap_start = __end__);
    PROVIDE (__heap_end = __HeapLimit);
    PROVIDE( __tls_align = MAX(ALIGNOF(.tdata), ALIGNOF(.tbss)) );
    PROVIDE( __tls_size_align = (__tls_size + __tls_align - 1) & ~(__tls_align - 1));
    PROVIDE( __arm32_tls_tcb_offset = MAX(8, __tls_align) );

    /* llvm-libc */
    PROVIDE (_end = __end__);
    PROVIDE (__llvm_libc_heap_limit = __HeapLimit);

    /* Check if data + heap + stack exceeds RAM limit */
    ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed")

    ASSERT( __binary_info_header_end - __logical_binary_start <= 1024, "Binary info must be in first 1024 bytes of the binary")
    ASSERT( __embedded_block_end - __logical_binary_start <= 4096, "Embedded block must be in first 4096 bytes of the binary")

    /* todo assert on extra code */
}


==================================================
/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/riscv32-unknown-elf-ld: mode elf32lriscv
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(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/../../../../riscv32-unknown-elf/lib/libc.a)libc_a-strtoull.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/../../../../riscv32-unknown-elf/lib/libc.a)libc_a-mbrtowc.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/../../../../riscv32-unknown-elf/lib/libc.a)libc_a-iswspace.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/../../../../riscv32-unknown-elf/lib/libc.a)libc_a-iswspace_l.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/../../../../riscv32-unknown-elf/lib/libc.a)libc_a-fclose.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/../../../../riscv32-unknown-elf/lib/libc.a)libc_a-fflush.o
próba otwarcia /home/mateush/Dysk_RAM/hid_kbd_fix_LSM6DS3_a_s_RP2350_master/build/libgloss.so zawiodła
próba otwarcia /home/mateush/Dysk_RAM/hid_kbd_fix_LSM6DS3_a_s_RP2350_master/build/libgloss.a zawiodła
próba otwarcia /media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgloss.so zawiodła
próba otwarcia /media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgloss.a zawiodła
próba otwarcia /media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/../../../../riscv32-unknown-elf/lib/libgloss.so zawiodła
próba otwarcia /media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/../../../../riscv32-unknown-elf/lib/libgloss.a powiodła się
/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/../../../../riscv32-unknown-elf/lib/libgloss.a
/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/../../../../riscv32-unknown-elf/lib/libc.a
/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/../../../../riscv32-unknown-elf/lib/libgloss.a
próba otwarcia /home/mateush/Dysk_RAM/hid_kbd_fix_LSM6DS3_a_s_RP2350_master/build/libgcc.so zawiodła
próba otwarcia /home/mateush/Dysk_RAM/hid_kbd_fix_LSM6DS3_a_s_RP2350_master/build/libgcc.a zawiodła
próba otwarcia /media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.so zawiodła
próba otwarcia /media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a powiodła się
/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)_divdi3.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)_moddi3.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)_udivdi3.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)_umoddi3.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)adddf3.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)divdf3.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)eqdf2.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)gedf2.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)ledf2.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)muldf3.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)subdf3.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)unorddf2.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)fixdfsi.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)fixunsdfsi.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)floatsidf.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)floatunsidf.o
(/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/../lib/gcc/riscv32-unknown-elf/14.0.1/libgcc.a)_clz.o
/media/mateush/Dane/Download/Pico_2/riscv-embecosm-embedded-ubuntu2004-20240407/bin/riscv32-unknown-elf-ld: warning: hog_kbd.elf has a LOAD segment with RWX permissions
Memory region         Used Size  Region Size  %age Used
             RAM:       20972 B       512 KB      4.00%
       SCRATCH_X:           0 B         4 KB      0.00%
       SCRATCH_Y:          2 KB         4 KB     50.00%
Loading into RAM:     [==============================]  100%

The device was rebooted to start the application.
mateush@mateush:~/Dysk_RAM/hid_kbd_fix_LSM6DS3_a_s_RP2350_master$
@kilograham kilograham added this to the 2.2.0 milestone Feb 3, 2025
@matsobdev
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So, pico_riscv_clang.cmake needs to be created here: https://github.com/raspberrypi/pico-sdk/tree/master/cmake/preload/toolchains:

set(CMAKE_SYSTEM_PROCESSOR hazard3)

set(PICO_CLANG_RUNTIMES riscv32-unknown-elf)

set(PICO_COMMON_LANG_FLAGS " -march=rv32ima_zicsr_zifencei_zba_zbb_zbs_zbkb_zca_zcb_zcmp -mabi=ilp32")

include(${CMAKE_CURRENT_LIST_DIR}/util/pico_riscv_clang_common.cmake)

and pico_riscv_clang_common.cmake here: https://github.com/raspberrypi/pico-sdk/tree/master/cmake/preload/toolchains/util:

include(${CMAKE_CURRENT_LIST_DIR}/find_compiler.cmake)

# include our Platform/PICO.cmake
set(CMAKE_SYSTEM_NAME PICO)

# Find Clang
pico_find_compiler(PICO_COMPILER_CC riscv32-unknown-elf-clang)
pico_find_compiler(PICO_COMPILER_CXX riscv32-unknown-elf-clang++)
set(PICO_COMPILER_ASM "${PICO_COMPILER_CC}" CACHE INTERNAL "")
pico_find_compiler(PICO_OBJCOPY llvm-objcopy)
pico_find_compiler(PICO_OBJDUMP llvm-objdump)

# Specify the cross compiler.
set(CMAKE_C_COMPILER ${PICO_COMPILER_CC} CACHE FILEPATH "C compiler")
set(CMAKE_CXX_COMPILER ${PICO_COMPILER_CXX} CACHE FILEPATH "C++ compiler")
set(CMAKE_ASM_COMPILER ${PICO_COMPILER_ASM} CACHE FILEPATH "ASM compiler")

# workaround for projects that don't enable ASM
set(CMAKE_ASM_COMPILE_OBJECT "<CMAKE_ASM_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -o <OBJECT>   -c <SOURCE>")
set(CMAKE_INCLUDE_FLAG_ASM "-I")

set(CMAKE_OBJCOPY ${PICO_OBJCOPY} CACHE FILEPATH "")
set(CMAKE_OBJDUMP ${PICO_OBJDUMP} CACHE FILEPATH "")

foreach(LANG IN ITEMS C CXX ASM)
    set(CMAKE_${LANG}_OUTPUT_EXTENSION .o)
endforeach()

# Add target system root to cmake find path.
get_filename_component(PICO_COMPILER_DIR "${PICO_COMPILER_CC}" DIRECTORY)
get_filename_component(CMAKE_FIND_ROOT_PATH "${PICO_COMPILER_DIR}" DIRECTORY)

# Look for includes and libraries only in the target system prefix.
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)

# Oz is preferred for Clang (verses CMake default -Os) see also https://gitlab.kitware.com/cmake/cmake/-/issues/22458
foreach(LANG IN ITEMS C CXX ASM)
    set(CMAKE_${LANG}_FLAGS_MINSIZEREL_INIT "-Oz -DNDEBUG")
endforeach()

include(${CMAKE_CURRENT_LIST_DIR}/set_flags.cmake)

@matsobdev
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For Pico 2 W, the problematic line is:

pico-sdk/src/rp2_common/pico_cyw43_driver/cyw43_bus_pio_spi.c

Line 90 in 95ea6ac

: "+l" (a), "=l" (tmp));

but I think solution is there #1922:

 : "+r" (a), "=r" (tmp));

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@kilograham @matsobdev