Bug 58914

Multiple calls to a target will be reduced when called via the "depends" tree resolution, but if a target is called with antcall/runtarget, a target will be rerun.  By creating a property and checking for it with "unless" I worked around this, but having an internal method to control it might be useful.

<project name="test" default="task2">
	<target name="init" unless="stop">
		<echo message="init" />
		<property name="stop" value="now" />
	</target>
	
	<target name="task1" depends="init">
		<echo message="task1" />
	</target>
	
	<target name="task2" depends="init">
		<echo message="task2" />
		<antcall target="task1" />
	</target>
</project>

This bug may be looking for similar functionality, but may also involve an actual bug.

https://bz.apache.org/bugzilla/show_bug.cgi?id=58886