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quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Fri, 21 Nov 2025 15:13:16 +0900 Message-Id: Cc: , Subject: Re: [linux-next:master 9676/10599] ld.lld: error: undefined symbol: rust_build_error From: "Alexandre Courbot" To: "kernel test robot" , "Alexandre Courbot" , "Alice Ryhl" , "Miguel Ojeda" X-Mailer: aerc 0.21.0-0-g5549850facc2 References: <202511210055.RUsFNku1-lkp@intel.com> In-Reply-To: <202511210055.RUsFNku1-lkp@intel.com> X-ClientProxiedBy: OS7PR01CA0123.jpnprd01.prod.outlook.com (2603:1096:604:24e::6) To CH2PR12MB3990.namprd12.prod.outlook.com (2603:10b6:610:28::18) Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR12MB3990:EE_|DM6PR12MB4404:EE_ X-MS-Office365-Filtering-Correlation-Id: 420876be-4ef7-45c8-a582-08de28c5117d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Nov 2025 06:13:20.5808 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: C+xVj7FTBV+ul2SMYeEHC8p5d+ybtT9uYoiBYxqH15GEIl8xfvlSywecP7JkiczK3bG/ZL6sPmkTIXmrYXMQdQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4404 On Fri Nov 21, 2025 at 1:41 AM JST, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.g= it master > head: 88cbd8ac379cf5ce68b7efcfd4d1484a6871ee0b > commit: 01e345e82ec3a5a7edeb9fa0dcb7fd4b0e5c534e [9676/10599] rust: num: = add Bounded integer wrapping type > config: loongarch-randconfig-6002-20251120 (https://download.01.org/0day-= ci/archive/20251121/202511210055.RUsFNku1-lkp@intel.com/config) > compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b= 5c1ec4a3095ab096dd780e84d7ab81f3d7ff) > rustc: rustc 1.88.0 (6b00bc388 2025-06-23) > reproduce (this is a W=3D1 build): (https://download.01.org/0day-ci/archi= ve/20251121/202511210055.RUsFNku1-lkp@intel.com/reproduce) > > If you fix the issue in a separate patch/commit (i.e. not just a new vers= ion of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot > | Closes: https://lore.kernel.org/oe-kbuild-all/202511210055.RUsFNku1-lkp= @intel.com/ > > All errors (new ones prefixed by >>): > >>> ld.lld: error: undefined symbol: rust_build_error > >>> referenced by build_assert.rs:83 (rust/kernel/build_assert.rs:83) > >>> rust/doctests_kernel_generated.o:(>::from_expr) in archive vmlinux.a > >>> referenced by build_assert.rs:83 (rust/kernel/build_assert.rs:83) > >>> rust/doctests_kernel_generated.o:(>::from_expr) in archive vmlinux.a > >>> referenced by build_assert.rs:83 (rust/kernel/build_assert.rs:83) > >>> rust/doctests_kernel_generated.o:(>::from_expr) in archive vmlinux.a Mmm, I don't like this. The expressions that are failing are extremely simple, for instance: Bounded::::from_expr(1) So if the compiler is unable to assess that this won't fail, this might be a deal-breaker for `from_expr` and we might need to remove it. :( This would also mean a lot more runtime checks when working with bitfields and registers. Or can we assume that this is a compiler problem on this particular architecture?