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Date: Thu, 27 Feb 2014 15:01:12 -0500
From: Jeff Cody <jcody@redhat.com>
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Subject: Re: [Qemu-devel] git build from clean broken?
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>, Fam Zheng <famz@redhat.com>, QEMU Developers <qemu-devel@nongnu.org>

On Thu, Feb 27, 2014 at 07:38:56PM +0000, Peter Maydell wrote:
> $ git clone  git://git.qemu.org/qemu.git
> [...]
> $ cd qemu
> $ mkdir build/a64-targets-nodbg/ && (cd build/a64-targets-nodbg/ &&
> '../../configure'
> '--target-list=aarch64-softmmu,arm-softmmu,aarch64-linux-user,arm-linux-user'
> '--cc=ccache gcc' '--disable-tools') && make -C
> build/a64-targets-nodbg/
> [...]
> make[1]: *** No rule to make target `../async.o', needed by
> `qemu-system-aarch64'. Stop.
> 
> Make seems to be able to build these files in its top level
> build directory:
> 
> make  -C build/a64-targets-nodbg async.o
> 
> but it can't build them on-demand when the targets in the
> per-target subdirectories reference them via ../object-file.o
> 
> git bisect blames this commit:
> commit ba1183da9a10b94611cad88c44a5c6df005f9b55
> Author: Fam Zheng <famz@redhat.com>
> Date:   Mon Feb 10 14:48:52 2014 +0800
> 
>     rules.mak: fix $(obj) to a real relative path
> 
> Any ideas?
>

Hi Peter,

It looks like this is the culprit, from that commit:

-common-obj-y = $(block-obj-y) blockdev.o blockdev-nbd.o block/
+common-obj-y = blockdev.o blockdev-nbd.o block/

You are running into this bug since you configured with
--disable-tools.

As a temp workaround, if you build qemu-nbd (or qemu-img) first, that
should build the required block-obj-y objects, which should then allow
everything to build.  E.g.:

    make -j5 qemu-nbd all


Jeff