From: Brian Candler <B.Candler@...>
Date: 2003-03-22T19:39:18+09:00
Subject: Re: Rake problem?

On Sat, Mar 22, 2003 at 06:47:23PM +0900, Manfred Lotz wrote:
> > I've uploaded version 0.2.1 of rake that modifies the way timestamps for
> > non-file tasks are calculated.  Essentially non-file tasks will take on
> > the latest timestamp of their prerequisites (it will default to the
> > current time if there are no prereqs).  The original example will now
> > work with 0.2.1, and I think this behavior is more intuitive, at the
> > cost of making the timestamp more expensive to calculate.
> > 
> 
> Good idea. This is indeed more intuitive.

Oops, missed that first time round :-)

It's no more expensive to calculate than listing the dependencies
explicitly. But I think it could be worth caching; say for example you have
1000 source files, each of which depends on

task :includes => ['header1.h', 'header2.h', 'header3.h' ...]

then you have N*M stat() calls to do, even if everything is up to date.

Regards,

Brian.