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<h2><a name="ant">Ant</a></h2>
<h3>Description</h3>

<p>Runs Apache Ant on a supplied buildfile. This can be used to build
subprojects.  <strong>This task must not be used outside of a
<code>target</code> if it invokes the same build file it is part
of.</strong></p>

<p>When the <i>antfile</i> attribute is omitted, the file &quot;build.xml&quot;
in the supplied directory (<i>dir</i> attribute) is used.</p>
<p>If no target attribute is supplied, the default target of the new project is
used.</p>
<p>By default, all of the properties of the current project will be
available in the new project.  Alternatively, you can set the
<i>inheritAll</i> attribute to <code>false</code> and only
&quot;user&quot; properties (i.e., those passed on the command-line)
will be passed to the new project.  In either case, the set of
properties passed to the new project will override the properties that
are set in the new project (See also the <a
href="property.html">property task</a>).</p>

<p>You can also set properties in the new project from the old project
by using nested property tags. These properties are always passed
to the new project and any project created in that project
regardless of the setting of <i>inheritAll</i>.  This allows you to
parameterize your subprojects.</p>

<p>When more than one nested <code>&lt;property&gt;</code> element
  would set a property of the same name, the one declared last will
  win.  This is for backwards compatibility reasons even so it is
  different from the way <code>&lt;property&gt;</code> tasks in build
  files behave.</p>

<p>Properties defined on the command line cannot be overridden by
  nested <code>&lt;property&gt;</code> elements.  <em>Since Ant
  1.8.0.</em> the same is true for nested structures
  of <code>&lt;ant&gt;</code> tasks: if a build file <em>A</em>
  invokes <em>B</em> via an <code>&lt;ant&gt;</code> task setting a
  property with a nested <code>&lt;property&gt;</code> element
  and <em>B</em> contains an <code>&lt;ant&gt;</code> tasks
  invoking <em>C</em>, <em>C</em> will see the value set
  in <em>A</em>, even if <em>B</em> used a
  nested <code>&lt;property&gt;</code> element as well.</p>

<p>References to data types can also be passed to the new project, but
by default they are not.  If you set the inheritrefs attribute to
true, all references will be copied, but they will not override
references defined in the new project.</p>

<p>Nested <a href="#reference"><i><code>&lt;reference&gt;</code></i></a> elements
can also be used to copy references from the calling project to the
new project, optionally under a different id.  References taken from
nested elements will override existing references that have been
defined outside of targets in the new project - but not those defined
inside of targets.</p>

<h3>Parameters</h3>
<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">antfile</td>
    <td valign="top">the buildfile to use. Defaults to
      &quot;build.xml&quot;.  This file is expected to be a filename
      relative to the dir attribute given.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">dir</td>
    <td valign="top">the directory to use as a basedir for the new Ant
      project (unless useNativeBasedir is set to true).
      Defaults to the current project's basedir, unless
      inheritall has been set to false, in which case it doesn't
      have a default value.  This will override the basedir
      setting of the called project.<br/>
      Also serves as the directory to resolve the antfile and output
      attribute's values (if any).
    </td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">target</td>
    <td valign="top">the target of the new Ant project that should be executed.
      Defaults to the new project's default target.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">output</td>
    <td valign="top">Filename to write the ant output to.  This is
    relative to the value of the dir attribute if it has been set or
    to the base directory of the current project otherwise.
    </td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">inheritAll</td>
    <td valign="top">If <code>true</code>, pass all properties to the
      new Ant project.  Defaults to <code>true</code>.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">inheritRefs</td>
    <td valign="top">If <code>true</code>, pass all references to the
      new Ant project.  Defaults to <code>false</code>.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">useNativeBasedir</td>
    <td valign="top">If set to true, the child build will use the same
      basedir as it would have used when run from the command line
      (i.e. the basedir one would expect when looking at the child
      build's buildfile).  Defaults to <code>false</code>.  <em>since
      Ant 1.8.0</em></td>
    <td valign="top" align="center">No</td>
  </tr>
</table>

<h3>Parameters specified as nested elements</h3>

<h4>property</h4>
<p>See the description of the <a href="property.html">property
task</a>. <br>
These properties become equivalent to properties you define on
the command line. These are special properties and they will always get passed
down, even through additional <code>&lt;*ant*&gt;</code> tasks with inheritall set to
false (see above). <br>
Note that the <code>refid</code> attribute points to a
reference in the calling project, not in the new one.</p>

<h4><a name="reference">reference</a></h4>
<p>Used to choose references that shall be copied into the new project,
optionally changing their id.</p>

<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">refid</td>
    <td valign="top">The id of the reference in the calling project.</td>
    <td valign="top" align="center">Yes</td>
  </tr>
  <tr>
    <td valign="top">torefid</td>
    <td valign="top">The id of the reference in the new project.</td>
    <td valign="top" align="center">No, defaults to the value of refid.</td>
  </tr>
</table>

<h4>propertyset</h4>

<p>You can specify a set of properties to be copied into the new
project with <a
href="../Types/propertyset.html">propertyset</a>s.</p>

<p><em>since Ant 1.6</em>.</p>

<h4>target</h4>

<p>You can specify multiple targets using nested <code>&lt;target&gt;</code> elements
instead of using the target attribute.  These will be executed as if
Ant had been invoked with a single target whose dependencies are the
targets so specified, in the order specified.</p>
<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">name</td>
    <td valign="top">The name of the called target.</td>
    <td valign="top" align="center">Yes</td>
  </tr>
</table>
<p><em>since Ant 1.6.3</em>.</p>

<h3>Basedir of the new project</h3>

<p>If you set <code>useNativeBasedir</code> to true, the basedir of
  the new project will be whatever the basedir attribute of
  the <code>&lt;project&gt;</code> element of the new project says (or
  the new project's directory if the there is no basedir attribute) -
  no matter what any other attribute of this task says and no matter
  how deeply nested into levels of
  <code>&lt;ant&gt;</code> invocations this task lives.</p>
 
<p>If you haven't set <code>useNativeBasedir</code> or set it to
  false, the following rules apply:</p>

<p>The basedir value of the new project is affected by the two
  attributes dir and inheritall as well as
  the <code>&lt;ant&gt;</code> task's history.  The current behaviour
  is known to be confusing but cannot be changed without breaking
  backwards compatibility in subtle ways.</p>

<p>If the <code>&lt;ant&gt;</code> task is in a "top level" build
  file, i.e. the project containing the <code>&lt;ant&gt;</code> task
  has not itself been invoked as part of a
  different <code>&lt;ant&gt;</code> (or <code>&lt;antcall&gt;</code>)
  task "higher up", the following table shows the details:</p>

<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>dir attribute</b></td>
    <td valign="top"><b>inheritAll attribute</b></td>
    <td valign="top"><b>new project's basedir</b></td>
  </tr>
  <tr>
    <td valign="top">value provided</td>
    <td valign="top">true</td>
    <td valign="top">value of dir attribute</td>
  </tr>
  <tr>
    <td valign="top">value provided</td>
    <td valign="top">false</td>
    <td valign="top">value of dir attribute</td>
  </tr>
  <tr>
    <td valign="top">omitted</td>
    <td valign="top">true</td>
    <td valign="top">basedir of calling project (the one whose build
        file contains the <code>&lt;ant&gt;</code> task).</td>
  </tr>
  <tr>
    <td valign="top">omitted</td>
    <td valign="top">false</td>
    <td valign="top">basedir attribute of the <code>&lt;project&gt;</code> element
        of the new project</td>
  </tr>
</table>

<p>If on the other hand the <code>&lt;ant&gt;</code> task is already
  nested into another invocation, the parent invocation's settings
  affect the outcome of the basedir value.  The current task's dir
  attribute will always win, but if the dir attribute has been omitted
  an even more complex situation arises:</p>

<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>parent dir attribute</b></td>
    <td valign="top"><b>parent inheritAll attribute</b></td>
    <td valign="top"><b>current inheritAll attribute</b></td>
    <td valign="top"><b>new project's basedir</b></td>
  </tr>
  <tr>
    <td valign="top">value provided</td>
    <td valign="top">any</td>
    <td valign="top">any</td>
    <td valign="top">value of parent's dir attribute</td>
  </tr>
  <tr>
    <td valign="top">omitted</td>
    <td valign="top">true</td>
    <td valign="top">true</td>
    <td valign="top">basedir of parent project (the one whose build
        file called the build file that contains
        the current <code>&lt;ant&gt;</code> task).</td>
  </tr>
  <tr>
    <td valign="top">omitted</td>
    <td valign="top">true</td>
    <td valign="top">false</td>
    <td valign="top">basedir of parent project (the one whose build
        file called the build file that contains
        the current <code>&lt;ant&gt;</code> task).</td>
  </tr>
  <tr>
    <td valign="top">omitted</td>
    <td valign="top">false</td>
    <td valign="top">true</td>
    <td valign="top">basedir of calling project (the one whose build
        file contains the current <code>&lt;ant&gt;</code> task).</td>
  </tr>
  <tr>
    <td valign="top">omitted</td>
    <td valign="top">false</td>
    <td valign="top">false</td>
    <td valign="top">basedir attribute of the <code>&lt;project&gt;</code> element
        of the new project</td>
  </tr>
</table>

<p>If you add even deeper levels of nesting, things get even more
  complicated and you need to apply the above table recursively.</p>

<p>If the basedir of the outer most build has been specified as a
  property on the command line (i.e. <code>-Dbasedir=some-value</code>
  or a <code>-propertyfile</code> argument) the value provided will
  get an even higher priority.  For any <code>&lt;ant&gt;</code> task
  that doesn't specify a dir attribute, the new project's basedir will
  be the value specified on the command line - no matter how deeply
  nested into layers of build files the task may be.</p>

<p>The same happens if the basedir is specified as a
  nested <code>&lt;property&gt;</code> of an <code>&lt;ant&gt;</code>
  task.  The basedir of build files started at deeper levels will be
  set to the specified value of the property element unless the
  corresponding Ant tasks set the dir attribute explicitly.</p>

<h3>Examples</h3>
<blockquote><pre>
&lt;ant antfile=&quot;subproject/subbuild.xml&quot; target=&quot;compile&quot;/&gt;

&lt;ant dir=&quot;subproject&quot;/&gt;

&lt;ant antfile=&quot;subproject/property_based_subbuild.xml&quot;&gt;
  &lt;property name=&quot;param1&quot; value=&quot;version 1.x&quot;/&gt;
  &lt;property file=&quot;config/subproject/default.properties&quot;/&gt;
&lt;/ant&gt;

&lt;ant inheritAll=&quot;false&quot; antfile=&quot;subproject/subbuild.xml&quot;&gt;
  &lt;property name=&quot;output.type&quot; value=&quot;html&quot;/&gt;
&lt;/ant&gt;
</pre></blockquote>

<p>These lines invoke the same build file:</p>
<blockquote><pre>
&lt;ant antfile=&quot;sub1/sub2/build.xml&quot; /&gt;
&lt;ant antfile=&quot;sub2/build.xml&quot; dir=&quot;sub1&quot; /&gt;
&lt;ant antfile=&quot;build.xml&quot; dir=&quot;sub1/sub2&quot; /&gt;
</pre></blockquote>

<p>The build file of the calling project defines some
<code>&lt;path&gt;</code> elements like this:</p>

<blockquote><pre>
&lt;path id="path1"&gt;
    ...
&lt;/path&gt;
&lt;path id="path2"&gt;
    ...
&lt;/path&gt;
</pre></blockquote>

<p>and the called build file (<code>subbuild.xml</code>) also defines
a <code>&lt;path&gt;</code> with the id <code>path1</code>, but
<code>path2</code> is not defined:</p>

<blockquote><pre>
&lt;ant antfile=&quot;subbuild.xml&quot; inheritrefs=&quot;true&quot;/&gt;
</pre></blockquote>

<p>will not override <code>subbuild</code>'s definition of
<code>path1</code>, but make the parent's definition of
<code>path2</code> available in the subbuild.</p>

<blockquote><pre>
&lt;ant antfile=&quot;subbuild.xml&quot;/&gt;
</pre></blockquote>

<p>as well as</p>

<blockquote><pre>
&lt;ant antfile=&quot;subbuild.xml&quot; inheritrefs=&quot;false&quot;/&gt;
</pre></blockquote>

<p>will neither override <code>path1</code> nor copy
<code>path2</code>.</p>

<blockquote><pre>
&lt;ant antfile=&quot;subbuild.xml&quot; inheritrefs=&quot;false&quot;&gt;
  &lt;reference refid=&quot;path1&quot;/&gt;
&lt;/ant&gt;
</pre></blockquote>

<p>will override <code>subbuild</code>'s definition of
<code>path1</code>.</p>

<blockquote><pre>
&lt;ant antfile=&quot;subbuild.xml&quot; inheritrefs=&quot;false&quot;&gt;
  &lt;reference refid=&quot;path1&quot; torefid=&quot;path2&quot;/&gt;
&lt;/ant&gt;
</pre></blockquote>

<p>will copy the parent's definition of <code>path1</code> into the
new project using the id <code>path2</code>.</p>


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