Re: default value for configurable bootclasspath in javac

I managed to solve the problem with a script:

  	<property name="javac.bootclasspath" value=""/>
  	<presetdef name="myjavac">
  		<javac source="1.7" target="1.7" includeantruntime="no">
  		</javac>
  	</presetdef>
  	<script id="myjavac_optional_attrs" language="javascript">
  		var bootclasspath = project.getProperty("javac.bootclasspath");
  		/* bootclasspath="" fails with Eclipse Compiler */
  		if (bootclasspath) {
  			var myjavacPreSetsWrapper = org.apache.tools.ant.ComponentHelper.getComponentHelper(project).getAntTypeTable().get("myjavac").getPreSets().getWrapper();
  			myjavacPreSetsWrapper.setAttribute("bootclasspath", bootclasspath);
  		}
  	</script>


On 14.04.2021 22:03, [email protected] wrote:
> Hi. I've got the following in my build xml:
> 
> 	<property name="javac.bootclasspath" value="" />
> 
> 	<presetdef name="myjavac">
> 		<javac source="1.7" target="1.7" includeantruntime="no" bootclasspath="${javac.bootclasspath}" >
> 		</javac>
> 	</presetdef>
> 
> The idea is to not alter bootclasspath when the caller did not provide an explicit -Djavac.bootclasspath=...
> An empty string as the default value works fine with Sun Javac, but it fails with: <javac compiler="org.eclipse.jdt.core.JDTCompilerAdapter">
> 
>      [myjavac] The type java.lang.Double cannot be resolved. It is indirectly referenced from required .class files
>      [myjavac] ----------
>      [myjavac] 1 problem (1 error)
> 
> Since the presetdef task does not support conditional attributes I'm asking for an advice on how to make it work.
> 
> This is Ant 1.10.8 bundled with Eclipse.
>