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

Yoann Congal
2026-02-04T13:07:47Z

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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.

> Cheers,
>
> Richard
>
>

--
Yoann Congal
Smile ECS

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