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Received: from shell.armlinux.org.uk ([2002:4e20:1eda:1:5054:ff:fe00:4ec]:54052) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jVyPd-0002rZ-5d; Tue, 05 May 2020 15:19:09 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1jVyPc-0007DZ-9d; Tue, 05 May 2020 15:19:08 +0100 Date: Tue, 5 May 2020 15:19:08 +0100 From: Russell King - ARM Linux admin To: Arnd Bergmann Subject: Re: [PATCH] ARM: use ARM unwinder for gcov Message-ID: <20200505141908.GH1551@shell.armlinux.org.uk> References: <20200505141218.684079-1-arnd@arndb.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200505141218.684079-1-arnd@arndb.de> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200505_072118_855936_E03D3C07 X-CRM114-Status: GOOD ( 11.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Nathan Huckleberry , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, clang-built-linux@googlegroups.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, May 05, 2020 at 04:11:56PM +0200, Arnd Bergmann wrote: > Using gcov on ARM fails when the frame pointer unwinder is used: > > arm-linux-gnueabi-ld: kernel/softirq.o:(.ARM.exidx+0x120): undefined reference to `__aeabi_unwind_cpp_pr0' > arm-linux-gnueabi-ld: init/main.o:(.ARM.exidx+0x98): undefined reference to `__aeabi_unwind_cpp_pr0' > arm-linux-gnueabi-ld: init/version.o:(.ARM.exidx+0x0): undefined reference to `__aeabi_unwind_cpp_pr0' > arm-linux-gnueabi-ld: init/do_mounts.o:(.ARM.exidx+0x28): undefined reference to `__aeabi_unwind_cpp_pr0' > arm-linux-gnueabi-ld: init/do_mounts_initrd.o:(.ARM.exidx+0x0): undefined reference to `__aeabi_unwind_cpp_pr0' > arm-linux-gnueabi-ld: init/initramfs.o:(.ARM.exidx+0x8): more undefined references to `__aeabi_unwind_cpp_pr0' follow > > This is likely a bug in clang that should be fixed in the compiler. > Forcing the use of the ARM unwinder in this configuration however > works around the problem. Or should the stub functions in arch/arm/kernel/unwind.c be moved out? -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 10.2Mbps down 587kbps up _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel