Re: [Qemu-trivial] [PATCH 4/4] fix compilation when reconfiguring without dtrace backend

[Paolo Bonzini]

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