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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id f34sm1359441qta.19.2019.06.07.08.26.12 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 07 Jun 2019 08:26:13 -0700 (PDT) Message-ID: <1559921171.6132.57.camel@lca.pw> Subject: Re: "arm64: Silence gcc warnings about arch ABI drift" breaks clang From: Qian Cai To: Will Deacon Cc: Dave Martin , Catalin Marinas , linux-arm-kernel@lists.infradead.org, "linux-kernel@vger.kernel.org" , Ard Biesheuvel , linux-efi@vger.kernel.org Date: Fri, 07 Jun 2019 11:26:11 -0400 In-Reply-To: <20190607152517.GC19862@fuggles.cambridge.arm.com> References: <1559920965.6132.56.camel@lca.pw> <20190607152517.GC19862@fuggles.cambridge.arm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.22.6 (3.22.6-10.el7) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2019-06-07 at 16:25 +0100, Will Deacon wrote: > On Fri, Jun 07, 2019 at 11:22:45AM -0400, Qian Cai wrote: > > The linux-next commit "arm64: Silence gcc warnings about arch ABI drift" [1] > > breaks clang build where it screams that unknown option "-Wno-psabi" and > > generates errors below, > > So that can be easily fixed with cc-option... > > > [1] https://lore.kernel.org/linux-arm-kernel/1559817223-32585-1-git-send-ema > > il-D > > ave.Martin@arm.com/ > > > > ./drivers/firmware/efi/libstub/arm-stub.stub.o: In function > > `install_memreserve_table': > > ./linux/drivers/firmware/efi/libstub/arm-stub.c:73: undefined reference to > > `__efistub___stack_chk_guard' > > ./linux/drivers/firmware/efi/libstub/arm-stub.c:73: undefined reference to > > `__efistub___stack_chk_guard' > > ./linux/drivers/firmware/efi/libstub/arm-stub.c:93: undefined reference to > > `__efistub___stack_chk_guard' > > ./linux/drivers/firmware/efi/libstub/arm-stub.c:93: undefined reference to > > `__efistub___stack_chk_guard' > > ./linux/drivers/firmware/efi/libstub/arm-stub.c:94: undefined reference to > > `__efistub___stack_chk_fail > > ... but this looks unrelated. Are you saying you don't see these errors if > you revert Dave's patch? Yes.