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Date: Tue, 09 Oct 2012 08:01:45 +0800
From: wenchao xia <xiaxia347os@163.com>
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Subject: Re: [Qemu-devel] [PATCH V6 1/5] libqblock build system
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To: Blue Swirl <blauwirbel@gmail.com>
Cc: kwolf@redhat.com, aliguori@us.ibm.com, stefanha@gmail.com, qemu-devel@nongnu.org, pbonzini@redhat.com, xiawenc@linux.vnet.ibm.com

>>> +######################################################################
>>> +# Support building shared library libqblock
>>> +libqblock.la:
>>> +       $(call quiet-command,$(MAKE) $(SUBDIR_MAKEFLAGS) -C libqblock
>>> V="$(V)" TARGET_DIR="$*/" libqblock.la,)
>>
>> Does not work for out of tree build:
>> $ make -C obj-amd64 libqblock.la
>> make: Entering directory `/src/qemu/obj-amd64'
>> make: Entering an unknown directory
>> make: *** libqblock: No such file or directory.  Stop.
>> make: Leaving an unknown directory
>> make: *** [libqblock.la] Error 2
>> make: Leaving directory `/src/qemu/obj-amd64'
>>
>> If I fake what 'configure' should be doing and add the directory and
>> link to Makefile, there are still problems:
>> $ make -C obj-amd64 libqblock.la
>> make: Entering directory `/src/qemu/obj-amd64'
>> make[1]: *** No rule to make target `libqblock.lo', needed by
>> `libqblock.la'.  Stop.
>> make: *** [libqblock.la] Error 2
>>
>    Could u give more tip about this error? what is obj-amd64?
> My understanding is you tried to build the library from another
> directory similar as:
> /extend_disk/xiawenc/qemu/qemu have the qemu source code, then
> [xiawenc@RedHat62GAWSWenchao xiawenc]$ pwd
> /extend_disk/xiawenc
> [xiawenc@RedHat62GAWSWenchao xiawenc]$ make -C qemu/qemu libqblock.la
> failed.
> Please correct me.
>
>> I think the library should be built by default, like vscclient which
>> probably nobody uses.
>>
>    libvirt can't link to it now for OOM issue, but I will wrapper the
> APIs with RPC later.
>
   I can't reproduce the issue, hope you can show how to make it happen.