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<a name="Using-a-source-file"></a>
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Next: <a href="Macros.html#Macros" accesskey="n" rel="next">Macros</a>, Previous: <a href="Using-the-command-line.html#Using-the-command-line" accesskey="p" rel="prev">Using the command line</a>, Up: <a href="Run_002dtime-configuration.html#Run_002dtime-configuration" accesskey="u" rel="up">Run-time configuration</a> [<a href="About-This-Guide.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsection">4.2.4 Using a source file</h4>
<p>Many embedded systems do not have a filesystem or a shell, so the
previous run-time configuration methods cannot be used on these targets.
On these platforms, a PolyORB node can also be configured using the API of package
<code>PolyORB.Parameters.Static</code>. An example configuration file may be
found in <samp>examples/static/po_static_conf.ads</samp>.
</p>
<p>An array of PolyORB parameters of type <code>Static_Parameters_Array</code> is
first declared containing a list of pairs of Variable and Value strings.
The syntax is close to the one described in configuration files.
A variable <code>Var.Iable</code> in section <code>[Sec]</code> is specified
as the pair of strings <code>"[sec]var.iable", "<value>"</code>.
</p>
<p>There is no need to with this <samp>po_static_conf.ads</samp> in the application
source code, the only requirement is that the array is exported with the
external name "<code>__polyorbconf_optional</code>". This allows to modify
PolyORB parameters without recompiling the application, just relinking
it. For example:
</p>
<div class="smallexample">
<pre class="smallexample"> $ gnatmake -c po_static_conf.ads `polyorb-config`
$ gnatmake -b -l server.adb `polyorb-config` -largs po_static_conf.o
</pre></div>
<p>Note the <code>-l</code> flag to gnatmake for linking only, and the need to
specify to the linker the object file with the array using <code>-largs</code>
if no package withs it.
</p>
<p>It should be noticed that this static array of parameters is read at
elaboration time only, this API cannot be used to modify the PolyORB
configuration at run-time.
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