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[Xen-devel] Re: [PATCH 1/4] xen: Clean up build system

To: Alexander Graf <agraf@xxxxxxx>
Subject: [Xen-devel] Re: [PATCH 1/4] xen: Clean up build system
From: Jan Kiszka <jan.kiszka@xxxxxx>
Date: Tue, 21 Jun 2011 09:57:11 +0200
Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, qemu-devel@xxxxxxxxxx, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
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On 2011-06-21 09:46, Alexander Graf wrote:
> On 21.06.2011, at 09:27, Jan Kiszka wrote:
>> On 2011-06-21 09:26, Alexander Graf wrote:
>>> On 21.06.2011, at 09:23, Jan Kiszka wrote:
>>>> On 2011-06-21 09:21, Alexander Graf wrote:
>>>>> On 21.06.2011, at 08:26, Jan Kiszka wrote:
>>>>>> From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
>>>>>> Introduce CONFIG_XEN_BACKEND so that this new config solely controls the
>>>>>> target-independent backend build and CONFIG_XEN can focus on per-target
>>>>>> building.
>>>>> What's the incentive here? I very much doubt we'll ever want to support 
>>>>> xen on !x86. In fact, the better solution would probably be to just move 
>>>>> every build component to x86 specific code.
>>>> I doubt that as well. But keeping the backend centrals prevent building
>>>> them twice (for i386 and x86_64).
>>> How can we not build them twice without risking that target_ulong breaks 
>>> somewhere along the way?
>> Because the backends don't depend on that. And we already build them
>> only once, your your logs. :)
> So what does the patch change then if it's already only built once?

It allows to clean up Makefile.target like I did as CONFIG_XEN is no
longer defined for all targets but only for those that actually support Xen.


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