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From: Peter Maydell <peter.maydell@linaro.org>
Date: Fri, 9 Aug 2013 18:14:09 +0100
Message-ID: <CAFEAcA_8jETHnJqoQdsd9NPCAgMgA8cdTq+Ve8sE9dvMgOMsXQ@mail.gmail.com>
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Subject: Re: [Qemu-devel] GDB debugging of QEMU.
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To: Yaodong Yang <yaodong.yangy@gmail.com>
Cc: qemu-devel@nongnu.org

On 9 August 2013 18:11, Yaodong Yang <yaodong.yangy@gmail.com> wrote:
> I think I did not make my question clear. I do not know
> 1. how to add "-g" flag when compile QEMU, in order to use gdb

This is what passing --enable-debug to configure does.

> 2. how to invoke QEMU with gdb,
> because my previous attempt failed. "gdb sudo
> /usr/local/kvm/bin/qemu-system/x86_64 -s -enable-kvm -hda"

This won't work because you're running gdb as your own
user and attempting to debug a program running as root.
'sudo gdb qemu-system-x86_64 ...' will probably work.

(Also, you almost certainly want to run gdb on the binary
that you just built rather than on the binary in
/usr/local/kvm/bin which is presumably whatever older
version was last installed.)

-- PMM