Compare with already existing and identical output file and *not* refresh its timestamp?

Hi,

 I understand incremental doxygen compilation is a hard problem. I've read
some of the past discussions. This request is *not* about incremental
doxygen compilation and it is not about making doxygen faster at all. It's
about something much simpler.

Can doxygen redundantly recompute everything from scratch (even when no
input has changed), and then at the very end compare and realise that it
just regenerated the exact same (XML, HTML,...) output file that is already
there from the previous run? Is there in this case an option *not* to
refresh the timestamp? I mean on a per output file basis of course.

Refreshing the timestamp has a disastrous cascade effect on further
processing like Sphinx which wrongly assumes everything has changed  even
when no doxygen output has changed at all (except timestamps).

Marc

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