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From Fergus Gallagher <Fergus.Gallag...@OrbisUK.com>
Subject Re: make-like use of timestamps to avoid unnecessary rework
Date Thu, 10 Feb 2000 13:45:24 GMT
I was dead wrong - the Javac task does

	if (srcFile.lastModified() > classFile.lastModified()) {
		compileList.addElement(srcFile.getAbsolutePath());
	}

My problem was that the clocks on my machine isn't properly synched with
the (samba) filesystem.

Fergus

Fergus Gallagher wrote:
> 
> Yes, I assumed you were having problems getting ant to STOP recompiling
> your sources.  That works.   But if you make a change to a source, ant
> (javac) will not recompile it as it only look for a corresponding .class
> without comparing timestamps or file sizes.  I find I use fine grained
> <deltree> targets if I'm working on a sub-project for any length of
> time.
> 
> Fergus
> 
> jon seymour wrote:
> >
> > I am may be wrong, but isn't it conditional recompile function you are
> > exploiting a function of javac, not ant?
> >
> > As far as I can tell ant target names are completely unrelated to filesystem
> > objects and a cursory examination of the code
> > didn't reveal any use of timestamps to suppress unnecessary work.
> >
> > jon.
> >
> > Fergus Gallagher wrote:
> >
> > > Ant does this but strangely I had a similar problem this morning.  It
> > > appears that ant needs to have the java sources in the same directory
> > > structure as the package name.  If you do this, then ant won't recompile
> > > things unnecessarily.
> > >
> > > Fergus
> > >
> > > jon seymour wrote:
> > > >
> > > > Hi. I like the ideas behind ant - great work!
> > > >
> > > > A feature of make that I would really miss, though, is the ability to
> > > > avoid performing work that hasn't been invalidated since last time it
> > > > was done [ my build processes are long running enough as they are! ]
> > > >
> > > > Are there any plans to incorporate some kind of timestamp checking
> > > > mechanism to avoid building targets that have already been built and are
> > > > still valid?
> > > >
> > > > Regards,
> > > >
> > > > jon.
> > >
> > > --
> > > Fergus Gallagher          Tel: +44 (20) 89 87 07 17
> > > Orbis                     Fax: +44 (20) 87 42 26 49
> > > The Swan Centre           email: Fergus.Gallagher@orbisuk.com
> > > Fishers Lane              Web: http://www.orbisuk.com
> > > London W4 1RX / UK
> 
> --
> Fergus Gallagher          Tel: +44 (20) 89 87 07 17
> Orbis                     Fax: +44 (20) 87 42 26 49
> The Swan Centre           email: Fergus.Gallagher@orbisuk.com
> Fishers Lane              Web: http://www.orbisuk.com
> London W4 1RX / UK

-- 
Fergus Gallagher          Tel: +44 (20) 89 87 07 17
Orbis                     Fax: +44 (20) 87 42 26 49
The Swan Centre           email: Fergus.Gallagher@orbisuk.com
Fishers Lane              Web: http://www.orbisuk.com
London W4 1RX / UK

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