was asked on friday by a make newbie to explain order-only prerequisite (OOP), as he was reading the explanation in the manual and was having trouble getting a fix on what it really meant.
i haven't used one for a while, so i reviewed the section and, AIUI (and the way i will try to explain it), an OOP means nothing more than, while the prerequisite will be timestamp checked to see if the rule needs to be invoked, whether or not that happens is simply not taken into account for the processing of *this* target. in short, while an OOP will be *processed* as usual, its invocation has no further effect. is that a fundamentally simple (and accurate) way to describe it? thanks muchly. rday
