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Date: Sat, 15 Nov 2003 14:50:20 -0500
From: "J. Xue" <ant@manifoldronin.com>
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To: Ant Users List <user@ant.apache.org>
Subject: Re: how to only do stuff if javac compiled something?
References: <200311141836.24590.lists@caoilte.org>
 <200311141807.45758.peter.reilly@corvil.com>
 <200311142013.22789.lists@caoilte.org>
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Quoting Caoilte O'Connor <lists@caoilte.org>:

> thanks I'll play with that over the weekend.
> 
> but is this really something no one else has ever felt the 
> need for? I'm starting to feel like I didn't think my build 
> process through properly.

I am with you, Caoilte. 8-)
In one of my build scripts, I have a "build" target depending on "compile" 
and "inc-build".  "inc-build" reads from a version.properties file, increases 
a build.number property in it, and writes it back.  Obviously, I'd like to 
have inc-build run only when there was at least one file compiled 
during "compile".

So far I haven't figured out a satisfactory way of doing this.  The closest I 
could get is using <uptodate> as Matt Benson pointed out in his message.  The 
problems is <uptodate> does not have exactly the same dependency check as 
<javac> does.  When 1.6 beta came out, I felt the <date> Selector can be used 
for that (create a timestamp just before you start compile, and afterwards try 
to select the class files modified after the timestamp), but then I couldn't 
figure out a way to test if a fileset is empty.

--J.X.


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