Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> I think you're dismissing the idea too cavalierly. If A generates B,
> A is inevitably changed frequently, but the changes to A affect B only
> rarely, this is a good trick.
The only output file that is unlikely to change is schemapg.h, which is
depended on by exactly one .c file. It's a waste of time to try to
optimize this at all ...
regards, tom lane