[Octave-bug-tracker] [bug #46063] Build system re-makes certain files 2 or even 3 times

[John W. Eaton]

Follow-up Comment #17, bug #46063 (project octave):

The problem with the current setup is that the configuration info is stored in
the Makefile but Makefile often changes in other ways that don't affect the
generated files.  That's why move-if-change is used, to avoid a cascade of
building other things when no real change has happened.

One solution is to generate the files at configure time and break the
dependency on Makefile.  But then we need to prevent inconsistencies if
configuration variables are modified on the Make command line.

Regarding your version.h example, that file would be generated by configure,
so it would be up to date in the sequence of events that you describe.

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