From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f174.google.com (mail-pg1-f174.google.com [209.85.215.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B1B63440C for ; Fri, 14 Oct 2022 20:17:00 +0000 (UTC) Received: by mail-pg1-f174.google.com with SMTP id 129so5256325pgc.5 for ; Fri, 14 Oct 2022 13:17:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=d9uRIcoHHJz9/gFQgE1VQpj6K6kcy16s5GCXSPDSWz4=; b=HNA6dMTAcvloY9M5J90Db+W0xpQ45C2srAwJ1pL0+gxkF1JbTwXp/LqhGKlbAlzdTY 60H49gCz+iDQL2gbl+RNuwngV0a+jL6REBC6XYZA9uj4YugIfa1EAIRrq7LuLMxKIPr5 EADYMgZJgxiiTr+YVX9jbyIxvTOmyEhGq2Qw5NYLz0wi+4xjrukjgsVPfRK+wPIb/Rzr eD2FjSLtdx1xgHjxXU9QPMAzO99i1tydmNWzZ0XJ1GE49+EIE2xqDx6IhwxYRCQ5BMpS ikxj7fU7hZE59fz0AeWVV6mSRtSYH7O29VZbQMhyyfEqMbbnISu5W8IP5CgSj5OnMCR4 W6rw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=d9uRIcoHHJz9/gFQgE1VQpj6K6kcy16s5GCXSPDSWz4=; b=vJ1rcTifcJELyT9Rud4Qkx2tefoTD5GvnSgBiaVdgaCjmdP8vYFcgnbEX5aGy4IXMJ MSNkJhUMUYRZNrcjeJtK0GZWvi6lRCfg3qz78t2l/hf5ZkLL6EZyLTKqcTy/EURXozzK /rpqRvPvsZJIYW3Wll1JSaab7II0qiJizJrWjAL2gzPrvXi6u34NoeClZ8CKcdw+MK2p fdsb8ys2if0rI5Na+VEV97I2p/WEP5woL15P6SvN2iHdoRzxJQWwL/CcLkAWJBPHZ7gN baVNTK5lPzPv/rloEm1T/L9j10z1JqEySrx2vpFrrFIVDdK2vgd711XHah251p8PuNWj FxSA== X-Gm-Message-State: ACrzQf2KWnCyKF4JF7qudQr6DKHBgYEVTSfcPs4m5AqjpVJovyW806R3 RLusvyACvHoHyoSgc7AIRNfG6mteBXTqHZBDZIW78g== X-Google-Smtp-Source: AMsMyM5xfbATi73WYV8RZgnDzrGNO9OZRqJyobu360Isyix61vSg0sq7gKJftcLC4q5SflGLTTLITg/mr1v7HdPS/ic= X-Received: by 2002:a62:1a97:0:b0:562:5587:12d6 with SMTP id a145-20020a621a97000000b00562558712d6mr6952880pfa.37.1665778619944; Fri, 14 Oct 2022 13:16:59 -0700 (PDT) Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20221014201354.3190007-1-ndesaulniers@google.com> In-Reply-To: <20221014201354.3190007-1-ndesaulniers@google.com> From: Nick Desaulniers Date: Fri, 14 Oct 2022 13:16:47 -0700 Message-ID: Subject: Re: [PATCH v4 0/4] pass -march= only to compiler To: Masahiro Yamada Cc: Arnd Bergmann , Ard Biesheuvel , Linus Walleij , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Nathan Chancellor , Russell King Content-Type: text/plain; charset="UTF-8" On Fri, Oct 14, 2022 at 1:14 PM Nick Desaulniers wrote: > > When both -march= and -Wa,-march= are specified for assembler or > assembler-with-cpp sources, GCC and Clang will prefer the -Wa,-march= > value but Clang will warn that -march= is unused. > > warning: argument unused during compilation: '-march=armv6k' > [-Wunused-command-line-argument] > > This is the top group of warnings we observe when using clang to > assemble the kernel via `ARCH=arm make LLVM=1`. > > Arnd sent a v2 of my previous patch > https://lore.kernel.org/linux-arm-kernel/20210928154143.2106903-14-arnd@kernel.org/ > I added yet a few more instances I found since then. Nathan pointed out > a new one too that I've fixed since v3. > > Fixing this will allow us to enable > -Werror=unused-command-line-argument for clang builds. > > v3 had an issue wrt. __thumb2__ > https://lore.kernel.org/llvm/CAKwvOdmkd2PxvMUZA=A-72eATGDZkqDj--Bv1W+Xt_K_LWdROA@mail.gmail.com/ > I've incorporated idea from Nathan and Ard on that. I probably should have made a note: the base of this series is a little funny. It's based on today's linux-next (20221014) but with 0a7606a9832ab375a38425a659bda13712ca89ae reverted. 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Fri, 14 Oct 2022 13:16:59 -0700 (PDT) MIME-Version: 1.0 References: <20221014201354.3190007-1-ndesaulniers@google.com> In-Reply-To: <20221014201354.3190007-1-ndesaulniers@google.com> From: Nick Desaulniers Date: Fri, 14 Oct 2022 13:16:47 -0700 Message-ID: Subject: Re: [PATCH v4 0/4] pass -march= only to compiler To: Masahiro Yamada Cc: Arnd Bergmann , Ard Biesheuvel , Linus Walleij , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Nathan Chancellor , Russell King X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221014_131706_342964_A19DF624 X-CRM114-Status: GOOD ( 17.09 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Oct 14, 2022 at 1:14 PM Nick Desaulniers wrote: > > When both -march= and -Wa,-march= are specified for assembler or > assembler-with-cpp sources, GCC and Clang will prefer the -Wa,-march= > value but Clang will warn that -march= is unused. > > warning: argument unused during compilation: '-march=armv6k' > [-Wunused-command-line-argument] > > This is the top group of warnings we observe when using clang to > assemble the kernel via `ARCH=arm make LLVM=1`. > > Arnd sent a v2 of my previous patch > https://lore.kernel.org/linux-arm-kernel/20210928154143.2106903-14-arnd@kernel.org/ > I added yet a few more instances I found since then. Nathan pointed out > a new one too that I've fixed since v3. > > Fixing this will allow us to enable > -Werror=unused-command-line-argument for clang builds. > > v3 had an issue wrt. __thumb2__ > https://lore.kernel.org/llvm/CAKwvOdmkd2PxvMUZA=A-72eATGDZkqDj--Bv1W+Xt_K_LWdROA@mail.gmail.com/ > I've incorporated idea from Nathan and Ard on that. I probably should have made a note: the base of this series is a little funny. It's based on today's linux-next (20221014) but with 0a7606a9832ab375a38425a659bda13712ca89ae reverted. It sounds like 0a7606a9832ab375a38425a659bda13712ca89ae might be dropped from -next imminently https://lore.kernel.org/linux-next/CAK7LNARg8OpqLR_71PJV3ZoLuDV8+mz9mphg=CzEeEEMY0G3rw@mail.gmail.com/. -- Thanks, ~Nick Desaulniers _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel