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. Signed-off-by: Arnd Bergmann <[email protected]> --- arch/arm/Kconfig.debug | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index a1dfb04231fd..41ef58acabf7 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -56,7 +56,7 @@ choice config UNWINDER_FRAME_POINTER bool "Frame pointer unwinder" - depends on !THUMB2_KERNEL + depends on !THUMB2_KERNEL && !(CC_IS_CLANG && GCOV_KERNEL) select ARCH_WANT_FRAME_POINTERS select FRAME_POINTER help -- 2.26.0
