[ccache] ccache on generated C++ files...

[Malfettone, Kris]

I apologize if this is answered somewhere already however I could not find it.

My project uses a large number of generated C++ files (.h/.cpp files).  On a clean build these files are cleaned up as well.  As a result during the next build since they are generated again they will all have a newer mtime and ctime than the previous runs.  Their content is the same though.  Is there a way for those files to disable checking both the mtime and ctime checks?  I would love to be able to check based on some sort of "check file size then check content checksum" ignoring mtime and ctime.

If it helps all of those files are generated to a different directory than the static source files (cmake source vs binary dirs.).

-Kris

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