linux-kernel - BUG - (suspected) - ORC unwinder with elfutils-0.174 causes ld failure during make

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Message-ID: <CAN55p+JXBO0OO_zbn9V-OnSKMQWhJDQb98yuVPC3XZD3kjo3rg@mail.gmail.com>
Date:   Fri, 21 Sep 2018 11:56:12 -0400
From:   John Lumby <jylumby@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: BUG - (suspected) - ORC unwinder with elfutils-0.174 causes ld
 failure during make

.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