linux-kernel - Re: [PATCH] ARM: use ARM unwinder for gcov

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Date:   Tue, 5 May 2020 15:19:08 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Nathan Huckleberry <nhuck15@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] ARM: use ARM unwinder for gcov

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/
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