DO NOT REPLY [Bug 42143] - Boolean expressions in if and unless attributes

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http://issues.apache.org/bugzilla/show_bug.cgi?id=42143





------- Additional Comments From stevel@apache.org  2007-04-17 03:20 -------
There's lots of reasons why this is really hard, and its been asked for before,
but I wont close it as wontfix, as it a sign of pent up need. 

Can I point out that there is a much cleaner way to do this; use the condition
task to set a property containing all your tests, and depend on the result:

    
    <target name="check-rebuild-needed">
      <condition property="make-the-jars" >
       <or>
        <isset property="A_changed" />
        <isset property="B_changed" />
      </condition>
    </target>
    
    <target name="make_jars" depends="check-rebuild-needed" if="make-the-jars">
     ...
    </target>

This keeps the dependency graph in order, lets you declare complex conditions,
and is fairly easy to debug.

-steve


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