[Users] unnecessary rebuilds

[Roland Haas]

Hello all,

> Yes, I experience the same. I tried a realclean, but after a complete
> rebuild they still occur.
> 
> I expect that there is an auto-generated file that changes when the
> thorn list changes. Could it be cctk.h itself?
I think I also have had these happen when I added a thorn to my
thornlist. This at least should be straightforward to check.

I have also had unexpected compilations happen at least once when all I
did was modify an existing thorn (though I might have modified its
interface.ccl, in particular its public variables, as well though
McLachlan should not care about public variables in GRHydro).

I also had issues where the system would not pick up a newly created
configuration.ccl (to REQUIRE Carpet in Zelmani's QuadWaveExtract)
unless I did a manual make sim-rebuild. This however I think might not
be related.

Yours,
Roland

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