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Date: Wed, 22 May 2013 12:51:42 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] makefile: detect corrupted elf files
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>, Anthony Liguori <aliguori@us.ibm.com>, qemu-devel@nongnu.org, Markus Armbruster <armbru@redhat.com>, Luiz Capitulino <lcapitulino@redhat.com>, Blue Swirl <blauwirbel@gmail.com>

Il 22/05/2013 12:50, Michael S. Tsirkin ha scritto:
> On Wed, May 22, 2013 at 12:40:23PM +0200, Paolo Bonzini wrote:
>> Il 22/05/2013 11:42, Michael S. Tsirkin ha scritto:
>>> On Wed, May 22, 2013 at 11:22:52AM +0200, Paolo Bonzini wrote:
>>>> Il 22/05/2013 10:52, Michael S. Tsirkin ha scritto:
>>>>> The fix is simple here: don't use ccache.  I don't.
>>>>>
>>>>> In fact, from what I saw people use ccache to work around makefile bugs,
>>>>> so they can do make clean; make and have it finish quickly.
>>>>>
>>>>> Any other examples?
>>>>
>>>> Testing configure patches should be done (also) from a clean build
>>>> directory, for example.
>>>
>>> In fact, relying on make clean for testing the build
>>> system is a mistake.  It's easy for it to forget to
>>> remove some temporary file. You really should do
>>> a clean clone.
>>
>> Yes, I use a clean clone (and a clean build directory for each patch),
>> _hence_ ccache helps reducing test times.
> 
> I see, this workflow is the exact reverse of mine:
> 
> I do as much as possible in a single tree so I
> rely on the makefile dependencies to be correct
> to rebuild the right things.

Usually I do the same---I just do slightly more thorough testing for
configure patches.

Paolo