Short of actually implementing complex incremental builds, there's another, unrelated and also much simpler optimization Doxygen could do: just vaguely keep track of modified times on *input* files.
1. Offer some way to --remember the newest modified_time across all input files. Could be stored in some empty file. 2. Then have a new, optional feature that: "--runs only if any input file is newer than this (empty) file" This would make a huge difference for incremental builds that involve not just doxygen but other (and faster) tools too; they could just skip running doxygen when not needed. I considered filing a new doxygen feature request for this on github (and also for the previously discussed *output* mtime optimization), however https://github.com/doxygen/doxygen/issues has 1800+ open issues right now so it feels like a black hole. PS: If anyone has ideas on how to emulate this with a small number of lines of CMake then please share. For instance this could generate an empty file right before starting doxygen as a decent approximation.
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