that you might find useful when writing <tt>RUN</tt> lines.</p>
<p>Lastly, you can easily mark a test that is expected to fail on a
-specific platform by using the <tt>XFAIL</tt> keyword. Xfail lines are
+specific platform or with a specific version of llvmgcc by using the <tt>XFAIL</tt> keyword. Xfail lines are
specified in the comments of the test program using <tt>XFAIL</tt>,
followed by a colon, and one or more regular expressions (separated by
-a comma) that will match against the target triplet for the
-machine. You can use * to match all targets. Here is an example of an
+a comma) that will match against the target triplet or llvmgcc version for the
+machine. You can use * to match all targets. You can specify the major or full version (i.e. 3.4) for llvmgcc. Here is an example of an
<tt>XFAIL</tt> line:</p>
<pre>
-; XFAIL: darwin,sun
+; XFAIL: darwin,sun,llvmgcc4
</pre>
</div>