Re: [OE-core] [PATCH 2/4] kernel-yocto-rust: use clang toolchain for riscv64 when Rust is enabled

[Harish Sadineni <Harish.Sadineni@windriver.com>]

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On 07-07-2026 01:07 pm, Mathieu Dubois-Briand wrote:
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> On Mon Jul 6, 2026 at 1:29 PM CEST, Harish via lists.openembedded.org Sadineni wrote:
>> From: Harish Sadineni<Harish.Sadineni@windriver.com>
>>
>> Enable LLVM/Clang toolchain for riscv64 kernel builds when Rust support
>> is enabled, as Rust is only supported with LLVM toolchains for this
>> architecture.
>>
>> This aligns with upstream kernel Rust architecture requirements as
>> documented in:
>> https://docs.kernel.org/rust/arch-support.html
>>
>> Signed-off-by: Harish Sadineni<Harish.Sadineni@windriver.com>
>> ---
> Hi Harish,
>
> Thanks for your patch.
>
>>   meta/recipes-kernel/linux/linux-yocto.inc | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/meta/recipes-kernel/linux/linux-yocto.inc b/meta/recipes-kernel/linux/linux-yocto.inc
>> index 4e230d405a..ee0d5abaeb 100644
>> --- a/meta/recipes-kernel/linux/linux-yocto.inc
>> +++ b/meta/recipes-kernel/linux/linux-yocto.inc
>> @@ -91,3 +91,7 @@ do_devshell:prepend() {
>>       d.setVar("HOSTPKG_CONFIG", "pkg-config-native")
>>       d.appendVar("OE_TERMINAL_EXPORTS", " HOSTPKG_CONFIG")
>>   }
>> +
>> +# For riscv64, Rust support in kernel only works with LLVM/Clang only.
>> +#https://docs.kernel.org/rust/arch-support.html
>> +TOOLCHAIN:riscv64 ="${@bb.utils.contains('KERNEL_FEATURES', 'rust', 'clang', '', d)}"
> So I believe this is wrong, as you are setting TOOLCHAIN to nothing if
> rust is not in KERNEL_FEATURES.
>
> This is failing on the autobuilder with:
> Parsing recipes...ERROR: ParseError at /srv/pokybuild/yocto-worker/qemuriscv64/build/layers/openembedded-core/meta/classes-global/base.bbclass:36: Could not inherit file classes/toolchain/.bbclass
> ERROR: Parsing halted due to errors, see error messages above
>
> https://autobuilder.yoctoproject.org/valkyrie/#/builders/45/builds/1836
>
> Can you have a look at the issue?
Hi Mathieu,

Thanks for catching this and for sharing the autobuilder failure.

I will send a new version shortly.

Thanks,
Harish


>
> Thanks,
> Mathieu
>
> --
> Mathieu Dubois-Briand, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
>

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