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15.21.0159.018; Thu, 2 Jul 2026 13:06:26 +0000 Message-ID: <0c44eae7-77d9-4375-8fef-704e5fda2d1f@windriver.com> Date: Thu, 2 Jul 2026 16:06:22 +0300 User-Agent: Mozilla Thunderbird Content-Language: en-US To: "openembedded-core@lists.openembedded.org" From: Daniel Dragomir Subject: [wrynose][SDK] kernel-devsrc: objtool build fails in SDK - works in scarthgap Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: ZR0P278CA0122.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:20::19) To MN7PR11MB628000.namprd11.prod.outlook.com (2603:10b6:208:5f2::11) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN7PR11MB628000:EE_|CH3PR11MB8706:EE_ X-MS-Office365-Filtering-Correlation-Id: 3799e82e-e415-4ff6-0572-08ded83ab958 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|366016|1800799024|10070799003|376014|11063799006|56012099006|6133799003|18002099003; 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definitions=2026-07-02_01,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 clxscore=1011 impostorscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607020137 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 ; Thu, 02 Jul 2026 13:06:33 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/240045 Hi all, I'm hitting a build failure when trying to build out-of-tree kernel modules using the SDK generated from Wrynose. The same workflow works fine with Scarthgap. Steps to reproduce (genericx86-64 machine and 6.18.24-yocto-standard): 1. IMAGE_INSTALL:append = " kernel-devsrc" in local.conf 2. bitbake core-image-sato-sdk -c populate_sdk 3. Install and source the SDK 4. cd $SDKTARGETSYSROOT/usr/lib/modules/6.18.24-yocto-standard/build 5. make modules_prepare It fails because make modules_prepare triggers objtool build, and objtool (host tool) picks up the target sysroot headers instead of the native host headers. DESCEND objtool CC .../build/tools/objtool/libsubcmd/exec-cmd.o .../usr/include/sys/cdefs.h:486: error: "__attribute_const__" redefined [-Werror] 486 | # define __attribute_const__ __attribute__ ((__const__)) .../build/tools/include/linux/compiler.h:123: note: this is the location of the previous definition 123 | # define __attribute_const__ There are also many -Werror=redundant-decls errors from glibc's stdlib.h (strtol, strtoul, strtoq, strtouq, strtoll, and others), for example: .../usr/include/stdlib.h:219:33: error: redundant redeclaration of 'strtol' [-Werror=redundant-decls] 219 | extern long int __REDIRECT_NTH (strtol, (const char *__restrict __nptr, | ^~~~~~ A workaround is to unset PKG_CONFIG_SYSROOT_DIR variable which is set by the SDK env file to $SDKTARGETSYSROOT. This makes objtool compile successfully, but I'm afraid this may break userspace application compilation that relies on PKG_CONFIG_SYSROOT_DIR to find libraries in the target sysroot. So the variable needs to be restored (or the environment re-sourced) before building applications. Is this a regression compared to Scarthgap where the same flow works without issues? Has anyone else encountered this? Thanks, Daniel