From: "Dave Korn"
> Ummm, that doesn't really sound like a well thought through plan
> to me.
That only means it can still happen.
> Well, this is something that is easily amenable to testing and measurement.
> It would be pretty trival to add a call to a path search (even one that is
> just trivially performed and the results thrown away; it'd still prove the
> point) controlled by an option switch and time a few big complex builds both
> with and without.
Measurement may be trival, interpretation of the result often
not quite. Here is something to think about:
I tested with an up-to-date project. It has 20 subprojects,
that means the top makefile runs 20 commands that are all
sub-makes. The sub-makes mostly report 'nothing to do', except
two that run two sub-makes each again. The timings are from
hot cache.
make CVS as is :
7.09 seconds
make CVS with per command path search :
2.81 seconds
Surprised?
--- grischka
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