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Date: Wed, 29 Sep 2010 13:42:51 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: [Qemu-devel] Re: [PATCH 2/2] trace: avoid unnecessary recompilation
 if nothing changed
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To: Markus Armbruster <armbru@redhat.com>
Cc: Blue Swirl <blauwirbel@gmail.com>, qemu-devel <qemu-devel@nongnu.org>

On 09/28/2010 10:58 AM, Markus Armbruster wrote:
> That was from memory.  And my example makefile to illustrate the problem
> was flawed.  So your patch might work reliably after all.  The common
> make voodoo incantation for this is a stamp file, though, as Paolo
> pointed out.

FWIW, Autoconf manual says that the stamp file is needed for 
low-resolution (1s or, for FAT, 2s) filesystems or something like that.

Paolo