Re: [Buildroot] [PATCH] arch/loongarch: Fix toolchain triple ABI suffix

[Julien Olivain via buildroot <buildroot@buildroot.org>]

Hi Jiaxun,

Thanks for the patch!

On 09/07/2025 00:56, Jiaxun Yang wrote:
> LoongArch GCC infers ABI from triple suffix, thus it's necesessary
> to set up proper triple ABI suffixes for different ABI types.
> 
> Adjust ABI suffix as per Table 10. List of possible <fabi-suffix>
> in "LoongArch Toolchain Conventions Version 1.00".
> 
> Link: 
> https://loongson.github.io/LoongArch-Documentation/LoongArch-toolchain-conventions-EN.html
> Link: https://lore.kernel.org/all/20250706105859.292908-1-ju.o@free.fr/
> Suggested-by: Julien Olivain <ju.o@free.fr>
> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
> ---
>  package/Makefile.in | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/package/Makefile.in b/package/Makefile.in
> index 
> 829636900ba950f4e2af4e070b7f979646600bcc..5ebb5f9ba8abd55cf9519cf3eb2a9a774ef9e271 
> 100644
> --- a/package/Makefile.in
> +++ b/package/Makefile.in
> @@ -83,6 +83,14 @@ ABI := $(ABI)hf
>  endif
>  endif
> 
> +# LoongArch Float ABI suffixes
> +ifeq ($(BR2_LOONGARCH_ABI_LP64F),y)
> +ABI = f32
> +endif
> +ifeq ($(BR2_LOONGARCH_ABI_LP64S),y)
> +ABI = sf
> +endif
> +

Unfortunately, while this patch fixes the configure error and goes a bit
further, it is not sufficient for a complete a build for the lp64f and
lp64s ABIs.

The following config to test "lp64d" ABI works
(same as without with patch).

     cat >.config <<EOF
     BR2_loongarch64=y
     BR2_LINUX_KERNEL=y
     BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
     BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
     BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF=y
     BR2_TARGET_ROOTFS_EXT2=y
     # BR2_TARGET_ROOTFS_TAR is not set
     BR2_TARGET_EDK2=y
     BR2_TARGET_GRUB2=y
     BR2_TARGET_GRUB2_LOONGARCH64_EFI=y
     EOF
     make olddefconfig
     make

Testing the "lp64f" ABI with commands:

     cat >.config <<EOF
     BR2_loongarch64=y
     BR2_LOONGARCH_FPU_32=y
     BR2_LINUX_KERNEL=y
     BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
     BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
     BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF=y
     BR2_TARGET_ROOTFS_EXT2=y
     # BR2_TARGET_ROOTFS_TAR is not set
     EOF
     make olddefconfig
     make

fails in host-gcc-initial with output:

     Assembler messages:
     /tmp/ccEkwSsD.s:28: Error: register save offset not a multiple of 8
     /tmp/ccEkwSsD.s:30: Error: register save offset not a multiple of 8
     /tmp/ccEkwSsD.s:50: Error: register save offset not a multiple of 8

Testing the "lp46s" ABI with commands:

     cat >.config <<EOF
     BR2_loongarch64=y
     BR2_LOONGARCH_FPU_NONE=y
     BR2_LINUX_KERNEL=y
     BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
     BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
     BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF=y
     BR2_TARGET_ROOTFS_EXT2=y
     # BR2_TARGET_ROOTFS_TAR is not set
     EOF
     make olddefconfig
     make

fails in host-gcc-final with output:

     /buildroot/output/host/loongarch64-buildroot-linux-gnusf/bin/ld: 
cannot find crti.o: No such file or directory
     /buildroot/output/host/loongarch64-buildroot-linux-gnusf/bin/ld: 
cannot find -lc: No such file or directory
     /buildroot/output/host/loongarch64-buildroot-linux-gnusf/bin/ld: 
cannot find crtn.o: No such file or directory

Note, the crt files are in "sf" subdirectory:
output/host/loongarch64-buildroot-linux-gnusf/sysroot/usr/lib/sf/crti.o

Could you have a look, please?

Best regards,

Julien.
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