From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Nathan Huckleberry <nhuck15@gmail.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com
Subject: Re: [PATCH] ARM: use ARM unwinder for gcov
Date: Tue, 5 May 2020 15:19:08 +0100 [thread overview]
Message-ID: <20200505141908.GH1551@shell.armlinux.org.uk> (raw)
In-Reply-To: <20200505141218.684079-1-arnd@arndb.de>
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
next prev parent reply other threads:[~2020-05-05 14:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-05 14:11 [PATCH] ARM: use ARM unwinder for gcov Arnd Bergmann
2020-05-05 14:19 ` Russell King - ARM Linux admin [this message]
2020-05-05 14:42 ` Arnd Bergmann
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