From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 604A7C433ED for ; Sat, 10 Apr 2021 17:23:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1EB6A610A2 for ; Sat, 10 Apr 2021 17:23:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234513AbhDJRXs (ORCPT ); Sat, 10 Apr 2021 13:23:48 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:17450 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234392AbhDJRXs (ORCPT ); Sat, 10 Apr 2021 13:23:48 -0400 Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 13AHK9b1004693; Sat, 10 Apr 2021 10:23:29 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=subject : to : cc : references : from : message-id : date : in-reply-to : content-type : content-transfer-encoding : mime-version; s=facebook; bh=5qAwhG377JAAFY4EakYQc2/XeWI0eABLjsfDiUK54Rc=; b=b6UAQogD+UV4ORnoq2v+530w0JB1oUt/qnIJ36Mlym0YLAb7S7N2LX+8gKsbg9VoAtRg vMSbx/A1sSHu2TyCEQLKRCaIF142k+JqF4JnO6OhH7stTSTmv3tBFcdl2b/yOLA8DJhd VHk1tGwdRRPJSzJRK2XuRk8ZCTLPW8IOiU4= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 37u7be1wev-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Sat, 10 Apr 2021 10:23:29 -0700 Received: from NAM12-MW2-obe.outbound.protection.outlook.com (100.104.31.183) by o365-in.thefacebook.com (100.104.35.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Sat, 10 Apr 2021 10:23:26 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Q7+CT6IoZUZHPJQReoRplQ1dXK5LhZBVWn/aOk6gxiGbYFcwDjXrHHIfC0a79KGvSs/UCVpvLZtf3kwkrM19zDnPZGJzbdpJZpstvTbHOuWaPXkmIzqWTYFYAT3lrMwfOwmyMQtLeCyMcqpTB3WA15ot/bEaFheh/DVZsFBIawC0jnHA0XuDR+IEYHxMNHiSnPKYd6cQa9ZlngMXD+wG5+7SEQlV97H/uXTBOFscMF3dhDi7pEeFGfeF4ZEouDwise6tuKSO+VMY5Kw0L/u4rwSLZVm6d5QOH/G811wl4YK82Prh102MheXJoFohBx8r0+Yp7w5WZ3pkKPqRLGY4PA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=5qAwhG377JAAFY4EakYQc2/XeWI0eABLjsfDiUK54Rc=; b=UTX2Fvnoo+L6FTDkq6SySWLm82VQwdCeY5tyAvmCjYYYIiq4Ho2czqvTV0UkTYHOl2yIKAH1LI+5BEtD+jEj0ehdMICwHvnMz9EQLtsfgx0yjbtS3AWWPlZVq7fEq69eq09odZdm1ArdtRM7CWjqclwrgtCNr6H9bVxrdgzNPsl3ECNNT0oW/E86D1ccLVBlYcoRbiodYRrIkS3hJBVlNLAvlN4I494qz6JGC3PPDSiFCdbJDwIraOHvcroFLmLWLe7fI+CNIqi+YZeOt1o5PfYRjvnf3jSNXk4I/bCfwEVVCyjbGgTMUBA/USN8XaNssFzIk3dAKU+srvHNEe9vrA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=fb.com; dmarc=pass action=none header.from=fb.com; dkim=pass header.d=fb.com; arc=none Authentication-Results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=fb.com; Received: from BN8PR15MB3282.namprd15.prod.outlook.com (2603:10b6:408:a8::32) by BN6PR15MB1585.namprd15.prod.outlook.com (2603:10b6:404:c8::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4020.22; Sat, 10 Apr 2021 17:23:23 +0000 Received: from BN8PR15MB3282.namprd15.prod.outlook.com ([fe80::315e:e061:c785:e40]) by BN8PR15MB3282.namprd15.prod.outlook.com ([fe80::315e:e061:c785:e40%3]) with mapi id 15.20.3933.039; Sat, 10 Apr 2021 17:23:23 +0000 Subject: Re: [PATCH bpf-next 0/5] support build selftests/bpf with clang To: Yonghong Song , CC: Andrii Nakryiko , Arnaldo Carvalho de Melo , , Nick Desaulniers , Sedat Dilek References: <20210410164925.768741-1-yhs@fb.com> From: Alexei Starovoitov Message-ID: <1ec2643d-0ac9-1dcd-8bbd-12cbc5884e7f@fb.com> Date: Sat, 10 Apr 2021 10:23:18 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 In-Reply-To: <20210410164925.768741-1-yhs@fb.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [2620:10d:c090:400::5:3c5b] X-ClientProxiedBy: MW4PR03CA0106.namprd03.prod.outlook.com (2603:10b6:303:b7::21) To BN8PR15MB3282.namprd15.prod.outlook.com (2603:10b6:408:a8::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2620:10d:c085:2103:c99:e09d:8a8f:94f0] (2620:10d:c090:400::5:3c5b) by MW4PR03CA0106.namprd03.prod.outlook.com (2603:10b6:303:b7::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4020.17 via Frontend Transport; Sat, 10 Apr 2021 17:23:21 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: c62ed24e-f23e-44d6-c521-08d8fc4557b9 X-MS-TrafficTypeDiagnostic: BN6PR15MB1585: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-FB-Source: Internal X-MS-Oob-TLC-OOBClassifiers: OLM:4502; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: ki6ZAZMGbS5KWLA1gnGhUIo3G+oYINAC7VSbzzc3jqgZ+GeRWBq/OjDBtRQtAWB4eRnxXjW/6TItJD/J12v8U50EqbnvcaaAJ7FjMTWG8wrVJcowx/Dlu+efs4E8nOWlAlSOKvdsixYSjFYx9hmdaBDle5uCeAyKjCCyaaYN6W6WoV4O0ufTGbLVebZHFiK13qnku1x7gBfN8yWYhz8UGuDLMtv/CB5/aHJwF53hSEhh/yWk5hkARVt5FoJMKLW/Id2Ks+2fH0tB1nkbAsWEJ16mHEVPRZIu+Fv9TBVeHfBE/jE12qLnjqmhldTjFiBNtlF76Sj74JT5sQAubEyrZTVeC/7lj7ZO4lsxV3R8YlJ9jn1wdPEjaqmcdLxkm+C8nrx4hKde1iSal0cWB/xdyOQMnwxPCkzdaIuXO92jyOElzBHvoig/50QzGAvOxH+15edConAAo413aZlPCkMICioGGi/oofMEALMj8z2KMNd/xIKPfQwF+LJFrJOWakH9MAwwnzQoeWvvkZIWEdz+WBFQj2Dk2VaXBrDQ6sFp46zdZH2vurhk+VK+vEFqI3tWwNvIP+2DFFaQamDvuByf1v3CLgW0Oj96m0z6nljMFObDGAQpBBKBdSvIcKs7zvp5+DANdL44MvnWNdihBAG11OmmmZvNpELESxfpuWj30cdER2zH4+/QErfLoeP4KP3L X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BN8PR15MB3282.namprd15.prod.outlook.com;PTR:;CAT:NONE;SFS:(39860400002)(366004)(376002)(346002)(396003)(136003)(31686004)(2616005)(2906002)(8936002)(4326008)(8676002)(36756003)(478600001)(66556008)(54906003)(6486002)(316002)(53546011)(52116002)(5660300002)(4744005)(86362001)(66476007)(16526019)(186003)(31696002)(66946007)(38100700002)(6666004)(45980500001)(43740500002);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?M1NMVDBOZ0tvTW9WdUdpamF0Y3RLR1ovUmM2VkpRaFQ4RmJSRDhHVDcxL0JG?= =?utf-8?B?OWloVDVwUWdMN1BESDZLdm9KY1lGb0xvRS9rVnZUbzFoK3Jqd1htVmZ0ZmFw?= =?utf-8?B?V01GVGIwVFFRdDNqWi84dDhyYVJlYlpzdmhZWDVJSCtLYW5sS1pqOS9KcHl3?= =?utf-8?B?MkdGU0ZFdjJaeEdCbm5GVHZGNEM3QlhjZG5hKzQ5M1Q3YnRKYjhaVVdtejMw?= =?utf-8?B?RGZWVEN3RUtubWtjODZYRUN4MlJsNVcyZ3IrT3FkN3JhTjZEMmNqS2YzVTVG?= =?utf-8?B?eHVPVE84R3RJL1FTRkVxOTBYdmtUQzd0amY5M2d4NHRJSkoxQy85djNLcFZr?= =?utf-8?B?L1REUmplZXg0V3p0T1E3QnNPa1QwV0k5Q1U3U0dIOUEydGEwQUVqZDdhbVBj?= =?utf-8?B?SUxVT1VuNkpHUXV4NFhDbDNZKzVoaDMxTjdDNkYxWHF1M0VWVkFsbWlVNVR6?= =?utf-8?B?QWMzREZad3VJQW15aDdralV0dXR6aU1KZjl4RDBLSG1ERFZ3Y2pDOHF3a3ls?= =?utf-8?B?emdXUTlUN0FvTlJMTE1NTEpIQ2w4R3d3U2pOT09MZURPN05TWnJwTEJOVGVw?= =?utf-8?B?bXh6RDRrNGhXMkRiOUhReTVpcnh5SGcwZkhScHhValYvKzZQUG96RUJyZE0w?= =?utf-8?B?aS9za0tuNytDMkRmWW1TM1ZFRFhSdGRKakhZRHV2UjJDQ0VDcnl6TG5weEVH?= =?utf-8?B?UWJBN1c1aE1PZnNFWDdVMXRWdkEra3dXbzgyOWhjUEEyTytKN2lwbVpsVUFi?= =?utf-8?B?MkY2dGV5NXFiTTRPSCs0UUFabmdnL3dHUkNzSENxdEc1c3dJZUFQZ05ucnl2?= =?utf-8?B?eHBRL2RrTkM2WGVHNkxKK1YwaGhLRFNlQkJsTVJLTG1JZUxHOHAvVWYvWFpw?= =?utf-8?B?bzJuNmZUaGlvTUpjMnhHYU5mMldsT3Z5N29zOTQwTEFhdTRKYVoxY3M0ZXRH?= =?utf-8?B?T05FZUExZkxzL2YwN3dIRlQxeUkyUXI4Z3NwSytiQUhFd1pjSHZRSUc5cmRl?= =?utf-8?B?VGtSYldjMjNvSHN0WnIzSDh1U2FtelZFSFJkbUNjaVJZd05hdDZTOUJhRklT?= =?utf-8?B?L29hS1FUb0RPVTdiMW9GZFIwSXkrODhMVTdtdjlheFVLbVhNeTFWMld6cTVy?= =?utf-8?B?bGNsanh2WGI3ZmJCenc4djVrZUhWTXBxWStXWGIvZEQ5bTQ0cFFIekx2SGQz?= =?utf-8?B?cDBVVXNIeWFza3oraXhaUGtkWXRVeXAyc1VKcFl6WFA0Uk85Y3dENDFGSUZR?= =?utf-8?B?QUxHbWFIZXlSK3d1ZGkreDdmTFlKUVRpelQzSmYvWFkwSWFFUVBEZW5sM3Ar?= =?utf-8?B?d3VGRisxZmRwS3dCOU56RjIrTU5jN1B2eU9wbUY3bkJ3T1krdTBCc2wxbGZs?= =?utf-8?B?cGUzeXRaeFVIMThoOW5YdU9FOVhZVDRQc2p3RFUyTEZtN2ZEWTJWRFU5amsx?= =?utf-8?B?Ni9zZmQvUzhSY29QZktYY1JUMERGM2lBNTNwZkhhVWFNUmdoLzFHb0YxclNN?= =?utf-8?B?OEFZTE5ENHNDMFVFVUNjdnNvMVBGVS9vTWpkL0VTTm9ETzlnN3lsYnMxb0t3?= =?utf-8?B?SGJBWHZOcmZ3M0xyajRrZ0xNU3NyOVFJcjRRdHl4dkUyTkRYRHR3M1ZJQjFV?= =?utf-8?B?VjU2SkpTUnF3bkVUY2EwM2RPeGZsU3NJL1g3M3ltc29UYWZrdlRGU2liK3cx?= =?utf-8?B?c3NYY1VIV3N3Zll4QXArZmRiY1VYVU9CenpOVEFzZkJhM2s5cTlOR1YxdGZW?= =?utf-8?B?djZCWWUxeUJuVEhTMEpHOTRKZ1lEWmt1Z3luS0hlTzAxc0czQ0NUenU4Z0dN?= =?utf-8?B?MW0yUXYyU2t6VEM5d3NsUT09?= X-MS-Exchange-CrossTenant-Network-Message-Id: c62ed24e-f23e-44d6-c521-08d8fc4557b9 X-MS-Exchange-CrossTenant-AuthSource: BN8PR15MB3282.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Apr 2021 17:23:23.8244 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: aYCohmEnAkmIx+iGMgbjENJuZWyTfkxR0ujLX5lxYcWilLfFgac/JRAEowQaVgPt X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR15MB1585 X-OriginatorOrg: fb.com X-Proofpoint-ORIG-GUID: -uKe5LNtDm-3u6pW3S1eOfP2kdvoC8mQ X-Proofpoint-GUID: -uKe5LNtDm-3u6pW3S1eOfP2kdvoC8mQ X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-04-10_07:2021-04-09,2021-04-10 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 adultscore=0 malwarescore=0 clxscore=1011 impostorscore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104100131 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On 4/10/21 9:49 AM, Yonghong Song wrote: > To build kernel with clang, people typically use > make -j60 LLVM=1 LLVM_IAS=1 > LLVM_IAS=1 is not required for non-LTO build but > is required for LTO build. In my environment, > I am always having LLVM_IAS=1 regardless of > whether LTO is enabled or not. > > After kernel is build with clang, the following command > can be used to build selftests with clang: > make -j60 -C tools/testing/selftests/bpf LLVM=1 LLVM_IAS=1 Will it use clang to compile libbpf and bpftool as well?