<li>Better detection of include and linking paths for system headers and
libraries, especially for Linux distributions.</li>
- <li>Implemented support
- for <a href="http://clang.llvm.org/docs/AutomaticReferenceCounting.html">Automatic
- Reference Counting</a> for Objective-C.</li>
+ <li>Several improvements to Objective-C support, including:
+
+ <ul>
+ <li><a href="http://clang.llvm.org/docs/AutomaticReferenceCounting.html">
+ Automatic Reference Counting</a> (ARC) and an improved memory model
+ cleanly separating object and C memory.</li>
+
+ <li>A migration tool for moving legacy code to ARC</li>
+
+ <li>Better support for data hiding, allowing instance variables to be
+ declared in implementation contexts or class extensions</li>
+ <li>Weak linking for classes</li>
+ <li>Improved static type checking by inferring the return type of methods
+ such as +alloc and -init.</li>
+ </ul>
+
+ Some new features require either the Mac OS X 10.7 / iOS 5 Objective-C
+ runtime, or version 1.6 or later of the GNUstep Objective-C runtime
+ version.</li>
<li>Implemented a number of optimizations in <tt>libclang</tt>, the Clang C
interface, to improve the performance of code completion and the mapping
licensed</a> under the MIT and UIUC license, allowing it to be used more
permissively.</p>
+<p>Libc++ has been ported to FreeBSD and imported into the base system. It is
+ planned to be the default STL implementation for FreeBSD 10.</p>
+
</div>