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Shutemov" , Ingo Molnar , Binbin Wu , Alexey Dobriyan , Rick Edgecombe , Sohil Mehta , Yu-cheng Yu , Dave Hansen , Muhammad Usama Anjum , Valentin Obst , linux-kselftest@vger.kernel.org, LKML , llvm@lists.linux.dev, x86@kernel.org, John Hubbard Subject: [PATCH v4 5/7] selftests/x86: avoid -no-pie warnings from clang during compilation Date: Thu, 4 Jul 2024 00:24:29 -0700 Message-ID: <20240704072431.111640-6-jhubbard@nvidia.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240704072431.111640-1-jhubbard@nvidia.com> References: <20240704072431.111640-1-jhubbard@nvidia.com> X-NVConfidentiality: public X-ClientProxiedBy: SJ0PR03CA0149.namprd03.prod.outlook.com (2603:10b6:a03:33c::34) To BY5PR12MB4130.namprd12.prod.outlook.com (2603:10b6:a03:20b::16) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY5PR12MB4130:EE_|PH7PR12MB6610:EE_ X-MS-Office365-Filtering-Correlation-Id: 09d21942-8c13-47e2-38e6-08dc9bfa77fc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|366016; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 09d21942-8c13-47e2-38e6-08dc9bfa77fc X-MS-Exchange-CrossTenant-AuthSource: BY5PR12MB4130.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jul 2024 07:25:23.7462 (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: tafXZ/F5tStBrTsJeva1d618NVpgkR2qKCgcY0icRmzD2gUBPxfbcVnoTuFe6wYhqa4dXypshVC442w8mHzuQQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6610 When building with clang, via: make LLVM=1 -C tools/testing/selftests ...clang warns that -no-pie is "unused during compilation". This occurs because clang only wants to see -no-pie during linking. Here, we don't have a separate linking stage, so a compiler warning is unavoidable without (wastefully) restructuring the Makefile. Avoid the warning by simply disabling that warning, for clang builds. Acked-by: Muhammad Usama Anjum Signed-off-by: John Hubbard --- tools/testing/selftests/x86/Makefile | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile index d0bb32bd5538..5c8757a25998 100644 --- a/tools/testing/selftests/x86/Makefile +++ b/tools/testing/selftests/x86/Makefile @@ -40,6 +40,13 @@ CFLAGS := -O2 -g -std=gnu99 -pthread -Wall $(KHDR_INCLUDES) # call32_from_64 in thunks.S uses absolute addresses. ifeq ($(CAN_BUILD_WITH_NOPIE),1) CFLAGS += -no-pie + +ifneq ($(LLVM),) +# clang only wants to see -no-pie during linking. Here, we don't have a separate +# linking stage, so a compiler warning is unavoidable without (wastefully) +# restructuring the Makefile. Avoid this by simply disabling that warning. +CFLAGS += -Wno-unused-command-line-argument +endif endif define gen-target-rule-32