Re: [OE-core] [PATCH v5 11/15] kernel.bbclass: Export artifacts needed for out-of-tree Rust compilation

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

On Wed Feb 11, 2026 at 5:19 PM CET, Harish Sadineni wrote:
>
> On 1/29/2026 10:09 PM, Sadineni, Harish via lists.openembedded.org wrote:
>> From: Yoann Congal <yoann.congal@smile.fr>
>>
>> Publish artifacts from kernel compilation to allow out-of-tree Rust
>> compilation:
>> * scripts/target.json: target definition: architecture, ABI, compiler
>>    options, ...
>> * rust/: the crates compiled by the kernel available to
>>    out-of-tree-modules
> Hi Yoann,
>
> I am dropping this patch “kernel.bbclass: Export artifacts needed for 
> out-of-tree Rust compilation” from my v6 patch series.
>
> Without this patch, target.json and the rust/ directory were already 
> getting published for x86_64. On arm64, target.json will not be created, 
> yet the module is still generated and works fine.
>
> When building rust-out-f-tree-module for arm64 with this patch applied, 
> it emits a warning that Out-of-tree rust modules build will fail due to 
> a missing target.json in kernel. However, in practice, the build 
> completes successfully.
>
> I have tested without this patch on both arm64 and x86_64, both tests 
> were successful.
>
> So, this patch does not appear to be necessary. Are you OK with dropping 
> this patch?

Yes, as long as it builds without warnings and test succesfully, I'm fine with it.

> I have pushed the updated changes to the below oe-contrib branch:
> https://git.openembedded.org/openembedded-core-contrib/log/?h=deepesh/rust-in-kernel-v6
>
> Additionally, I have extended the ccache disabling to make-mod-scripts 
> (as part of "kernel: Disable ccache when kernel rust support is enabled" 
> patch) and updated "meta-skeleton: Add rust-out-of-tree-module recipe" 
> to align with the new changes.

Shouldn't the KERNEL_RUST_SUPPORT check in
rust-out-of-tree-module_git.bb be moved to the module-rust class?

Generally, If you think that you rewrote some patches, I'm OK with you
taking authorship (leaving me as Co-developed-by). That should allow you
to edit patches more freely.

Regards,

> Thanks,
> Harish
>> Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
>> Signed-off-by: Harish Sadineni <Harish.Sadineni@windriver.com>
>> ---
>>   meta/classes-recipe/kernel.bbclass | 18 ++++++++++++++++++
>>   1 file changed, 18 insertions(+)
>>
>> diff --git a/meta/classes-recipe/kernel.bbclass b/meta/classes-recipe/kernel.bbclass
>> index 30a10b0801..dfb8604a68 100644
>> --- a/meta/classes-recipe/kernel.bbclass
>> +++ b/meta/classes-recipe/kernel.bbclass
>> @@ -632,6 +632,24 @@ do_shared_workdir () {
>>   		cp -r scripts/gcc-plugins ${kerneldir}/scripts
>>   	fi
>>   
>> +	if ${@bb.utils.contains("DISTRO_FEATURES", "rust-kernel", "true", "false", d)}; then
>> +		# Copy target.json file needed for out-of-tree rust modules
>> +		if [ -e scripts/target.json ]; then
>> +			bbnote "Copying scripts/target.json"
>> +			mkdir -p ${kerneldir}/scripts
>> +			cp scripts/target.json ${kerneldir}/scripts
>> +		else
>> +			bbwarn "scripts/target.json not found in compiled kernel. Out-of-tree rust modules will fail to build."
>> +		fi
>> +
>> +		# Copy rust/ needed by out-of-tree module (firstly for the core rust crate)
>> +		if [ -e rust/ ]; then
>> +			bbnote "Copying rust/"
>> +			cp -r rust ${kerneldir}/
>> +		else
>> +			bbwarn "rust/ not found in compiled kernel. Out-of-tree rust modules will fail to build."
>> +		fi
>> +	fi
>>   }
>>   
>>   # We don't need to stage anything, not the modules/firmware since those would clash with linux-firmware
>>
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-- 
Yoann Congal
Smile ECS