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Date: Mon, 09 May 2011 10:42:08 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-trivial] [PATCH 4/4] fix compilation when reconfiguring
 without dtrace backend
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On 05/09/2011 10:34 AM, Stefan Hajnoczi wrote:
> BTW the Makefiles don't
> seem to have a step before compilation to generate all the
> dependencies, instead dependencies only kick in after the first build
> has completed?

Yes, the first build doesn't need dependencies on headers.  Rules for 
.c->.o and .o->executable are enough to get everything built.

> Is there some smart change detection you are thinking about or just
> something like keeping the old copy of config-host.h and friends to
> see if they have changed?

Just that, perhaps for both .h and .mak files.  Consider this very 
patch; it is plausible that switching to another tracing backend does 
not change the .h files, right now the backend is only present in .h 
files to enable the monitor/cmdline interfaces.

Paolo