Message ID | 20240503030214.86681-6-jhubbard@nvidia.com (mailing list archive) |
---|---|
State | Accepted |
Commit | 54df8db8c658f29a35e3bfe651e49f87f72dec76 |
Headers | show
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Shutemov" <kirill.shutemov@linux.intel.com>, Ingo Molnar <mingo@kernel.org>, Binbin Wu <binbin.wu@linux.intel.com>, Alexey Dobriyan <adobriyan@gmail.com>, Rick Edgecombe <rick.p.edgecombe@intel.com>, Sohil Mehta <sohil.mehta@intel.com>, Yu-cheng Yu <yu-cheng.yu@intel.com>, Dave Hansen <dave.hansen@linux.intel.com>, Valentin Obst <kernel@valentinobst.de>, linux-kselftest@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>, llvm@lists.linux.dev, x86@kernel.org, John Hubbard <jhubbard@nvidia.com> Subject: [PATCH 5/7] selftests/x86: avoid -no-pie warnings from clang during compilation Date: Thu, 2 May 2024 20:02:12 -0700 Message-ID: <20240503030214.86681-6-jhubbard@nvidia.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240503030214.86681-1-jhubbard@nvidia.com> References: <20240503030214.86681-1-jhubbard@nvidia.com> X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BY3PR10CA0027.namprd10.prod.outlook.com (2603:10b6:a03:255::32) To BY5PR12MB4130.namprd12.prod.outlook.com (2603:10b6:a03:20b::16) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: <linux-kselftest.vger.kernel.org> List-Subscribe: <mailto:linux-kselftest+subscribe@vger.kernel.org> List-Unsubscribe: <mailto:linux-kselftest+unsubscribe@vger.kernel.org> MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY5PR12MB4130:EE_|LV8PR12MB9109:EE_ X-MS-Office365-Filtering-Correlation-Id: 54edd36c-7d95-4a20-6292-08dc6b1d7291 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|7416005|376005|366007|1800799015; 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selftests/x86: fix build errors and warnings found via clang
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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
First of all, in order to build with clang at all, one must first apply Valentin Obst's build fix for LLVM [1]. Once that is done, then 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. [1] https://lore.kernel.org/all/20240329-selftests-libmk-llvm-rfc-v1-1-2f9ed7d1c49f@valentinobst.de/ Signed-off-by: John Hubbard <jhubbard@nvidia.com> --- tools/testing/selftests/x86/Makefile | 7 +++++++ 1 file changed, 7 insertions(+)