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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 v3 5/7] selftests/x86: avoid -no-pie warnings from clang during compilation Date: Fri, 31 May 2024 12:38:36 -0700 Message-ID: <20240531193838.108454-6-jhubbard@nvidia.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240531193838.108454-1-jhubbard@nvidia.com> References: <20240531193838.108454-1-jhubbard@nvidia.com> X-NVConfidentiality: public X-ClientProxiedBy: SJ0PR05CA0063.namprd05.prod.outlook.com (2603:10b6:a03:332::8) 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_|IA1PR12MB7712:EE_ X-MS-Office365-Filtering-Correlation-Id: eec6e666-5417-41a4-b468-08dc81a947c1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|1800799015|376005|7416005|366007; 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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. 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