Re: how to explain this line ?

[Eric Melski]

On 02/05/2013 07:56 AM, Paul Smith wrote:
> On Tue, 2013-02-05 at 13:45 +0800, horseriver wrote:
> >    $(filter-out FORCE,$^) represent what?
>
> $^ will expand to the list of prerequisites of the rule which are newer
> than the target.

Small correction:  $^ is the list of all prerequisites, not just those 
which are newer than the output (which would be $?).


> So in this case, that operation returns all the prerequisites of the
> rule which are newer than the target, and which are not the "FORCE"
> prerequisite.

Per the above correction, the result is _all_ prerequisites of the rule 
which are not the "FORCE" prerequisite, regardless of timestamp relative 
to the output target.

best regards,

Eric Melski
Chief Architect
Electric Cloud, Inc.
http://blog.melski.net/