Re: [OE-core] [wrynose][PATCH] kernel-yocto-rust: skip recipe for riscv64 when Rust support is enabled

["Yoann Congal" <yoann.congal@smile.fr>]

On Tue Aug 11, 2026 at 1:58 PM CEST, Harish via lists.openembedded.org Sadineni wrote:
> From: Harish Sadineni <Harish.Sadineni@windriver.com>
>
> Kernel Rust support on riscv64 requires building the kernel with Clang.
> Since Wrynose does not provide Clang toolchian support for kernel
> builds, skip the recipe when TARGET_ARCH is riscv64.

Hello,

OE-Core/wrynose indeed does not but meta-clang seem to do that:
https://github.com/kraj/meta-clang/blob/wrynose/conf/nonclangable.conf#L369

Wouldn't this patch needlessly prevent user from using meta-clang to get
a RISCV rust-enabled kernel?

I wonder if we need a patch more like master's:
2b228490b7e (kernel-yocto-rust: Add clang toolchain check for riscv64, 2026-08-05)

What do you think?

>
> This avoids attempting an unsupported kernel Rust build and provides a
> clear parse-time error explaining the limitation.
>
> Signed-off-by: Harish Sadineni <Harish.Sadineni@windriver.com>
> ---
>  meta/classes-recipe/kernel-yocto-rust.bbclass | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/meta/classes-recipe/kernel-yocto-rust.bbclass b/meta/classes-recipe/kernel-yocto-rust.bbclass
> index 49f2bfc1ae..6be97c2db8 100644
> --- a/meta/classes-recipe/kernel-yocto-rust.bbclass
> +++ b/meta/classes-recipe/kernel-yocto-rust.bbclass
> @@ -25,3 +25,12 @@ do_kernel_configme:append () {
>  # More details in: https://lists.openembedded.org/g/openembedded-core/message/229336
>  # Disable ccache for kernel build if kernel rust support is enabled to workaround this.
>  CCACHE_DISABLE ?= "1"
> +
> +python () {
> +    if d.getVar('TARGET_ARCH') == 'riscv64' :
> +        raise bb.parse.SkipRecipe(
> +            "Rust support in the kernel on riscv64 requires kernel to build with clang, "
> +            "Wrynose doesn't have clang toolchain support for kernel. See "
> +            "https://docs.kernel.org/rust/arch-support.html for details."
> +        )
> +}

Regards,
-- 
Yoann Congal
Smile ECS