Re: How to use shell builtin command in Makefile?

[Peng Yu]

> It probably is marginally faster.  I doubt, for this situation, whether
> it will make a noticeable difference (especially if you change the =
> to := as I suggested... that will make MUCH more difference to
> performance).  Of course there's only one way to know: measure it.  In
> general it's quite useless to try to solve performance problems before
> you know what's causing them.  Premature optimization is a sure way to
> waste a lot of development time and effort.

BTW, what is the general rule of thumb to use := rather =? When I
should use = rather :=?

Thanks,
Peng