[wwwdocs] update 4.5 changes for c++ runtime

[Benjamin Kosnik <bkoz at redhat dot com>]

Like the subject says. Seems like a reasonable place to start for 4.5
changes.

-benjamin

2010-01-07  Benjamin Kosnik  <bkoz@redhat.com>

        * htdocs/gcc-4.5/changes.html: Update C++ runtime for 4.5 changes.


Index: htdocs/gcc-4.5/changes.html
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    <h4>Runtime Library (libstdc++)</h4>
  
    <ul>
+     <li><a href="http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.200x";>
+ 	Improved experimental support for the upcoming ISO C++ standard, 
+ 	C++0x</a>, including:
+       <ul>
+       <li>Support for &lt;future&gt;, &lt;functional&gt;, 
+ 	and &lt;random&gt;.</li>
+       <li>Existing facilities now exploit explicit operators and the
+ 	newly implemented core C++0x features.</li>
+       </ul>
+     </li>
+ 
+     <li>
+ <p>An experimental <a href="http://gcc.gnu.org/onlinedocs/libstdc++/manual/profile_mode.html";>
+     profile mode </a> has been added. This is an implementation of
+     many C++ Standard library constructs with an additional analysis
+     layer that gives performance improvement advice based on
+     recognition of suboptimal usage patterns. For example,
+ </p>
+ 
+ <pre>
+ #include &lt;vector&gt;
+ int main() 
+ {
+   vector&lt;int&gt; v;
+   for (int k = 0; k &gt; 1024; ++k) 
+     v.insert(v.begin(), k);
+ }
+ </pre>
+ 
+ <p>
+ When instrumented via the profile mode, can return suggestions about
+ initial size and optimal container choice as follows:
+ </p>
+ 
+ <pre>
+ vector-to-list: improvement = 5: call stack = 0x804842c ...
+     : advice = change std::vector to std::list
+ vector-size: improvement = 3: call stack = 0x804842c ...
+     : advice = change initial container size from 0 to 1024
+ </pre>
+ 
+ <p>
+ These constructs can be substituted for the normal libstdc++
+ constructs on a piecemeal basis, or all existing components can be
+ transformed via the <code>-D_GLIBCXX_PROFILE</code> macro.
+ </p>
+ </li>
+ 
+     <li><a href="http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.tr24733";>Support for decimal floating-point arithmetic (aka ISO C++ TR
+     24733)</a> has been added. This support is in header file
+     &lt;decimal/decimal&gt;, uses namespace <code>std::decimal</code>,
+     and includes
+     classes <code>decimal32</code>, <code>decimal64</code>,
+     and <code>decimal128</code>.</li> 
+ 
+     <li>Sources have been audited for application of function attributes
+       nothrow, const, pure, and noreturn.</li>
+ 
+     <li>Python pretty-printers have been added for many standard
+     library components that simplify the internal representation and
+     present a more intuitive view of components when used with
+     appropriately-advanced versions of gdb. For more information,
+     please consult the
+     more <a href="http://sourceware.org/gdb/wiki/STLSupport";>detailed</a>
+     description.</li>
+ 
+     <li>The default behavior for comparing typeinfo names has changed,
+     so in &lt;typeinfo&gt;, <code>__GXX_MERGED_TYPEINFO_NAMES</code>
+     now defaults to zero.</li>
+ 
      <li>The new <code>-static-libstdc++</code> option
      directs <code>g++</code> to link the C++ library statically, even
      if the default would normally be to link it dynamically.</li>