Messages in this thread | | | From | Arnd Bergmann <> | Date | Tue, 5 May 2020 16:42:20 +0200 | Subject | Re: [PATCH] ARM: use ARM unwinder for gcov |
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On Tue, May 5, 2020 at 4:19 PM Russell King - ARM Linux admin <linux@armlinux.org.uk> wrote: > > 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?
I had not realized this is only a stub. Moving them out should fix the link failure, I can send a patch after testing if we are sure that calling them is not a bug in clang that would lead to runtime failures.
Arnd
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