[wwwdocs] Mention variable tracking & location lists

[Josef Zlomek]

Here is the updated patch.

Josef

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  <dl>
  
+ <dt><b>February 6, 2004</b></dt>
+ <dd>
+ Josef Zlomek of SUSE Labs and Daniel Berlin of IBM Research have contributed
+ Variable Tracking.  It generates more accurate debug info about locations of
+ variables and allows debugging code compiled
+ with <code>-fomit-frame-pointer</code>.
+ </dd>
+ 
  <dt><b>October 18, 2003</b></dt>
  <dd>
  Bernardo Innocenti of Develer S.r.l. has contributed the
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  <h2>Caveats</h2>
  
+   <ul>
+     <li>GCC now generates location lists by default when compiling with debug
+ 	info and optimization.
+ 	<ul>
+ 	  <li>GDB 6.0 and older crashes when it sees location lists.
+ 	      GDB 6.1 or later is needed to debug binaries containing location
+ 	      lists.</li>
+ 	  <li>When you are trying to view a value of a variable in a part of
+ 	      a function where it has no location (for example when the variable
+ 	      is no longer used and thus its location was used for something
+ 	      else) GDB will say that it is not available.</li>
+ 	</ul>
+ 	You can disable generating location lists by
+ 	<code>-fno-var-tracking</code>.</li>
+   </ul>
+ 
  <h2>General Optimizer Improvements</h2>
  
  <h2>New Languages and Language specific improvements</h2>
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  <h2>Documentation improvements</h2>
  
  <h2>Other significant improvements</h2>
+ 
+   <ul>
+     <li>Location lists are now generated by default when compiling with debug
+ 	info and optimization.  Location lists are more accurate debug info
+ 	about locations of variables and they allow debugging code compiled
+ 	with <code>-fomit-frame-pointer</code>.</li>
+   </ul>
  
  </body>
  </html>