Re: [OE-core] [PATCH v5 07/15] kernel-yocto.bbclass: Disable ccache when rust-kernel is enabled

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

On 2/10/2026 8:54 PM, Yoann Congal wrote:
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> On Wed Feb 4, 2026 at 2:07 PM CET, Yoann Congal wrote:
>> Le mer. 4 févr. 2026 à 13:34, Richard Purdie <
>> richard.purdie@linuxfoundation.org> a écrit :
>>
>>> On Wed, 2026-02-04 at 13:31 +0100, Yoann Congal wrote:
>>>> On Wed Feb 4, 2026 at 1:05 PM CET, Paul Barker wrote:
>>>>> On Thu, 2026-01-29 at 08:39 -0800, Sadineni, Harish via
>>>>> lists.openembedded.org wrote:
>>>>>> From: Yoann Congal <yoann.congal@smile.fr>
>>>>>>
>>>>>> Currently, a ccache enabled build fails with:
>>>>>>    |   HOSTRUSTC scripts/generate_rust_target
>>>>>>    |   HOSTCC  scripts/kallsyms
>>>>>>    |   HOSTCC  scripts/sorttable
>>>>>>    |   HOSTCC  scripts/asn1_compiler
>>>>>>    |   TOUCH   include/generated/gcc-plugins.h
>>>>>>    |   DESCEND objtool
>>>>>>    | error: multiple input filenames provided (first two filenames
>>> are gcc and
>>> .../tmp/work-shared/qemux86-64/kernel-source/scripts/generate_rust_target.rs)
>>>>>> when using ccache, value of "HOSTCC=cache gcc" when this value is
>>> passing
>>>>>> to rustc, It is thinking gcc is a input file. when ccache is not
>>> used "HOSTCC=gcc" is passed.
>>>>>> Disable ccache for kernel build if rust-kernel is enabled to
>>> workaround
>>>>>> this.
>>>>>>
>>>>>> Signed-off-by: El Mehdi YOUNES <elmehdi.younes@smile.fr>
>>>>>> Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
>>>>>> Signed-off-by: Harish Sadineni <Harish.Sadineni@windriver.com>
>>>>> This patch is good, but we should try to get the issue resolved
>>> upstream
>>>>> if we can so that ccache can be used.
>>>>>
>>>>> Has this been reported upstream yet? Could you also open a bug in our
>>>>> bugzilla to track this?
>>>> Hello,
>>>>
>>>> For context, a lengthy discussion happened on this patch here:
>>>>
>>> https://lore.kernel.org/openembedded-core/CA+TGqK9Yd2WWKrhMkhofF-8N0cESCSefWD2DXr4sBO9fDQXyrg@mail.gmail.com/t/#u
>>>> And, sadly, we lack resources at the moment on our side to follow-up on
>>> this :-/
>>>
>>> Putting some links alongside this to more details would probably at
>>> least help a bit, particularly if ccache upstream documents it is
>>> imcompatible with rust...
>>>
>> Ok, I'll send a more documented patch to Harish for him to integrate in his
>> next iteration.
> I pushed a branch on contrib (v5 + this commit modified)
> https://git.openembedded.org/openembedded-core-contrib/log/?h=ycongal/kernel-rust
>
> The modified commit is:
> https://git.openembedded.org/openembedded-core-contrib/commit/?h=ycongal/kernel-rust&id=794bdad82933ee112452c8c08c917cf235e07ada
>
> Harish, are you OK taking this for your next iteration?
Yes, I'm  fine with this.

Thanks
Harish
>
> Regards,
> --
> Yoann Congal
> Smile ECS
>