[Qemu-devel] git build from clean broken?

[Peter Maydell]

$ 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 <address@hidden>
Date:   Mon Feb 10 14:48:52 2014 +0800

    rules.mak: fix $(obj) to a real relative path

Any ideas?

thanks
-- PMM