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15.21.0360.006; Fri, 4 Sep 2026 11:40:07 +0000 Message-ID: Date: Fri, 4 Sep 2026 17:10:04 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [OE-core] [wrynose][PATCH] kernel-yocto-rust: skip recipe for riscv64 when Rust support is enabled To: Yoann Congal , openembedded-core@lists.openembedded.org Cc: Sundeep.Kokkonda@windriver.com References: <20260811115855.4033577-1-Harish.Sadineni@windriver.com> Content-Language: en-US From: Harish Sadineni In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SJ0PR13CA0068.namprd13.prod.outlook.com (2603:10b6:a03:2c4::13) To PH0PR11MB5658.namprd11.prod.outlook.com (2603:10b6:510:e2::23) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH0PR11MB5658:EE_|IA3PR11MB9253:EE_ X-MS-Office365-Filtering-Correlation-Id: 871f05d5-3b7a-43ac-e825-08df0a7944a7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-04_03,2026-09-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 lowpriorityscore=0 impostorscore=0 phishscore=0 malwarescore=0 suspectscore=0 clxscore=1015 adultscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609040105 List-Id: X-Webhook-Received: from 45-33-107-173.ip.linodeusercontent.com [45.33.107.173] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Fri, 04 Sep 2026 11:40:23 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/245090 On 04-09-2026 03:04 am, Yoann Congal wrote: > CAUTION: This email comes from a non Wind River email account! > Do not click links or open attachments unless you recognize the sender and know the content is safe. > > On Tue Aug 11, 2026 at 1:58 PM CEST, Harish via lists.openembedded.org Sadineni wrote: >> From: Harish Sadineni >> >> 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? Hi Yoann, I understood what you meant, If someone uses 'linux-yocto_%.bbappend' to build the kernel with the clang toolchain [1], this patch would prevent them from using rust in the kernel. Is my understanding correct? If so, I'll implement the same clang toolchain check as 'kernel-yocto-rust: Add clang toolchain check for riscv64' for wrynose, and just adjust the error message accordingly. [1]https://github.com/kraj/meta-clang/blob/wrynose/README.md#kernel-build-with-clang Thanks, harish >> This avoids attempting an unsupported kernel Rust build and provides a >> clear parse-time error explaining the limitation. >> >> Signed-off-by: Harish Sadineni >> --- >> 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