.config has CONFIG_UNWINDER_ORC=y
elfutils version 0.174 (latest)
make of the kernel source fails with errors such as this
arch/x86/kvm/../../../virt/kvm/kvm_main.o: file not recognized: file
format not recognized
emitted by ld
ld is from latest binutils version 2.31
gcc is version 7.3
Found in kernel kver 4.17.10 and also in latest 4.19-rc4
problem is caused by this transformation directed from the Makefile
./tools/objtool/objtool orc generate --module --no-fp
--retpoline "arch/x86/kvm/../../../virt/kvm/kvm_main.o";
make succeeds when CONFIG_UNWINDER_ORC is not set
Cheers, John Lumby
