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 <h1>Clang 3.1 Release Notes</h1>

 <img style="float:right" src="http://llvm.org/img/DragonSmall.png"
      width="136" height="136" alt="LLVM Dragon Logo">

 <ul>
   <li><a href="#intro">Introduction</a></li>
   <li><a href="#whatsnew">What's New in Clang 3.1?</a>
     <ul>
       <li><a href="#cchanges">C Language Changes</a></li>
       <li><a href="#cxxchanges">C++ Language Changes</a></li>
       <li><a href="#objcchanges">Objective-C Language Changes</a></li>
       <li><a href="#pythonchanges">Python Binding Changes</a></li>
     </ul>
   </li>
   <li><a href="#additionalinfo">Additional Information</a></li>
 </ul>

 <div class="doc_author">
   <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
 </div>

 <!-- ======================================================================= -->
 <h2 id="intro">Introduction</h2>
 <!-- ======================================================================= -->

 <p>This document contains the release notes for the Clang C/C++/Objective-C
 frontend, part of the LLVM Compiler Infrastructure, release 3.1.  Here we
 describe the status of Clang in some detail, including major improvements from
 the previous release and new feature work. For the general LLVM release notes,
 see <a href="http://llvm.org/docs/ReleaseNotes.html">the LLVM
  documentation</a>. All LLVM releases may be downloaded from the
 <a href="http://llvm.org/releases/">LLVM releases web site</a>.</p>

 <p>For more information about Clang or LLVM, including information about the
 latest release, please check out the main please see the
 <a href="http://clang.llvm.org">Clang Web Site</a> or the
 <a href="http://llvm.org">LLVM Web Site</a>.

 <p>Note that if you are reading this file from a Subversion checkout or the main
 Clang web page, this document applies to the <i>next</i> release, not the
 current one.  To see the release notes for a specific release, please see the
 <a href="http://llvm.org/releases/">releases page</a>.</p>

 <!-- ======================================================================= -->
 <h2 id="whatsnew">What's New in Clang 3.1?</h2>
 <!-- ======================================================================= -->

 <p>Some of the major new features and improvements to Clang are listed here.
 Generic improvements to Clang as a whole or two its underlying infrastructure
 are described first, followed by language-specific sections with improvements to
 Clang's support for those languages.</p>

 <!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
 <h3 id="cchanges">C Language Changes in Clang</h3>
 <!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->

 <h4 id="c11changes">C11 Feature Support</h4>

 <p>Clang 3.1 adds support for anonymous structs and anonymous unions, added in
 the latest ISO C standard. Use <code>-std=c11</code> or <code>-std=gnu11</code>
 to enable support for the new language standard. The new C11 features are
 backwards-compatible and are available as an extension in all language
 modes.</p>

 <p>All warning and language selection flags which previously accepted
 <code>c1x</code> have been updated to accept <code>c11</code>. The old
 <code>c1x</code> forms have been removed.

 <!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
 <h3 id="cxxchanges">C++ Language Changes in Clang</h3>
 <!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->

 <h4 id="cxx11changes">C++11 Feature Support</h4>
 <p>Clang 3.1 supports
 <a href="http://clang.llvm.org/cxx_status.html#cxx11">most of the language
 features</a> added in the latest ISO C++ standard,
 <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372">C++ 2011</a>.
 Use <code>-std=c++11</code> or <code>-std=gnu++11</code> to enable support for
 these features. In addition to the features supported by Clang 3.0, the
 following are now considered to be of production quality:
 <ul>
   <li>Generalized constant expressions</li>
   <li>Lambda expressions</li>
   <li>Generalized initializers</li>
   <li>Unrestricted unions</li>
   <li>User-defined literals</li>
   <li>Forward-declared enumerations</li>
   <li>Atomics (both libc++'s and libstdc++4.7's <tt>&lt;atomic&gt;</tt> are
       supported)</li>
 </ul>

 <!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
 <h3 id="objcchanges">Objective-C Language Changes in Clang</h3>
 <!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
 Clang 3.1 introduces several new Objective-C language features and improvements.

 <h4 id="literals-subscripting">Objective-C literals and subscripting</h3>

 <p>Objective-C now provides additional literal expressions, including numeric, array, and dictionary literals. Additionally, array and dictionary elements can be accesses via the subscripting operator. For more information about the new literals, see the <a href="ObjectiveCLiterals.html">documentation for Objective-C literals and subscripting</a>.

 <h4 id="objcwformat">Format string checking for NSString literals</h4>

 <code>-Wformat</code> now checks <code>@"NSString literals"</code>.

 <!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
 <h3 id="pythonchanges">Python Binding Changes</h3>
 <!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->

 The following methods have been added:
 <ul>
   <li>SourceLocation.from_position (static)</li>
   <li>SourceLocation.__eq__ and SourceLocation.__ne__</li>
   <li>SourceRange.__eq__ and SourceRange.__ne__</li>
   <li>Diagnostic.category_number (property)</li>
   <li>Diagnostic.category_name (property)</li>
   <li>Diagnostic.option (property)</li>
   <li>Diagnostic.disable_option (property)</li>
   <li>CursorKind.is_translation_unit</li>
   <li>CursorKind.is_preprocessing</li>
   <li>CursorKind.is_unexposed</li>
   <li>Cursor.from_location (static)</li>
   <li>Cursor.underlying_typedef_type (property)</li>
   <li>Cursor.enum_type (property)</li>
   <li>Cursor.objc_type_encoding (property)</li>
   <li>Cursor.hash</li>
   <li>TypeKind.spelling</li>
   <li>Type.argument_types</li>
   <li>Type.element_type (property)</li>
   <li>Type.element_count (property)</li>
   <li>Type.is_function_variadic</li>
   <li>Type.is_pod</li>
   <li>Type.get_array_element_type</li>
   <li>Type.get_array_size</li>
   <li>Type.__eq__ and Type.__ne__</li>
   <li>File.from_name (static)</li>
   <li>File.__str__ and File.__repr__</li>
 </ul>

 <!-- ======================================================================= -->
 <h2 id="additionalinfo">Additional Information</h2>
 <!-- ======================================================================= -->

 <p>A wide variety of additional information is available on the
 <a href="http://clang.llvm.org/">Clang web page</a>.  The web page contains
 versions of the API documentation which are up-to-date with the Subversion
 version of the source code.  You can access versions of these documents specific
 to this release by going into the "<tt>clang/doc/</tt>" directory in the Clang
 tree.</p>

 <p>If you have any questions or comments about Clang, please feel free to
 contact us via the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">
 mailing list</a>.</p>


 </div>
 </body>
 </html>
	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
	"http://www.w3.org/TR/html4/strict.dtd">
	<html>
	<head>
	<title>Clang 3.1 Release Notes</title>
	<link type="text/css" rel="stylesheet" href="../menu.css">
	<link type="text/css" rel="stylesheet" href="../content.css">
	<style type="text/css">
	td {
	vertical-align: top;
	}
	</style>
	</head>
	<body>

	<!--#include virtual="../menu.html.incl"-->

	<div id="content">

	<h1>Clang 3.1 Release Notes</h1>

	<img style="float:right" src="http://llvm.org/img/DragonSmall.png"
	width="136" height="136" alt="LLVM Dragon Logo">

	<ul>
	<li><a href="#intro">Introduction</a></li>
	<li><a href="#whatsnew">What's New in Clang 3.1?</a>
	<ul>
	<li><a href="#cchanges">C Language Changes</a></li>
	<li><a href="#cxxchanges">C++ Language Changes</a></li>
	<li><a href="#objcchanges">Objective-C Language Changes</a></li>
	<li><a href="#pythonchanges">Python Binding Changes</a></li>
	</ul>
	</li>
	<li><a href="#additionalinfo">Additional Information</a></li>
	</ul>

	<div class="doc_author">
	<p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
	</div>

	<!-- ======================================================================= -->
	<h2 id="intro">Introduction</h2>
	<!-- ======================================================================= -->

	<p>This document contains the release notes for the Clang C/C++/Objective-C
	frontend, part of the LLVM Compiler Infrastructure, release 3.1. Here we
	describe the status of Clang in some detail, including major improvements from
	the previous release and new feature work. For the general LLVM release notes,
	see <a href="http://llvm.org/docs/ReleaseNotes.html">the LLVM
	documentation</a>. All LLVM releases may be downloaded from the
	<a href="http://llvm.org/releases/">LLVM releases web site</a>.</p>

	<p>For more information about Clang or LLVM, including information about the
	latest release, please check out the main please see the
	<a href="http://clang.llvm.org">Clang Web Site</a> or the
	<a href="http://llvm.org">LLVM Web Site</a>.

	<p>Note that if you are reading this file from a Subversion checkout or the main
	Clang web page, this document applies to the <i>next</i> release, not the
	current one. To see the release notes for a specific release, please see the
	<a href="http://llvm.org/releases/">releases page</a>.</p>

	<!-- ======================================================================= -->
	<h2 id="whatsnew">What's New in Clang 3.1?</h2>
	<!-- ======================================================================= -->

	<p>Some of the major new features and improvements to Clang are listed here.
	Generic improvements to Clang as a whole or two its underlying infrastructure
	are described first, followed by language-specific sections with improvements to
	Clang's support for those languages.</p>

	<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
	<h3 id="cchanges">C Language Changes in Clang</h3>
	<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->

	<h4 id="c11changes">C11 Feature Support</h4>

	<p>Clang 3.1 adds support for anonymous structs and anonymous unions, added in
	the latest ISO C standard. Use <code>-std=c11</code> or <code>-std=gnu11</code>
	to enable support for the new language standard. The new C11 features are
	backwards-compatible and are available as an extension in all language
	modes.</p>

	<p>All warning and language selection flags which previously accepted
	<code>c1x</code> have been updated to accept <code>c11</code>. The old
	<code>c1x</code> forms have been removed.

	<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
	<h3 id="cxxchanges">C++ Language Changes in Clang</h3>
	<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->

	<h4 id="cxx11changes">C++11 Feature Support</h4>
	<p>Clang 3.1 supports
	<a href="http://clang.llvm.org/cxx_status.html#cxx11">most of the language
	features</a> added in the latest ISO C++ standard,
	<a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372">C++ 2011</a>.
	Use <code>-std=c++11</code> or <code>-std=gnu++11</code> to enable support for
	these features. In addition to the features supported by Clang 3.0, the
	following are now considered to be of production quality:
	<ul>
	<li>Generalized constant expressions</li>
	<li>Lambda expressions</li>
	<li>Generalized initializers</li>
	<li>Unrestricted unions</li>
	<li>User-defined literals</li>
	<li>Forward-declared enumerations</li>
	<li>Atomics (both libc++'s and libstdc++4.7's <tt><atomic></tt> are
	supported)</li>
	</ul>

	<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
	<h3 id="objcchanges">Objective-C Language Changes in Clang</h3>
	<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
	Clang 3.1 introduces several new Objective-C language features and improvements.

	<h4 id="literals-subscripting">Objective-C literals and subscripting</h3>

	<p>Objective-C now provides additional literal expressions, including numeric, array, and dictionary literals. Additionally, array and dictionary elements can be accesses via the subscripting operator. For more information about the new literals, see the <a href="ObjectiveCLiterals.html">documentation for Objective-C literals and subscripting</a>.

	<h4 id="objcwformat">Format string checking for NSString literals</h4>

	<code>-Wformat</code> now checks <code>@"NSString literals"</code>.

	<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
	<h3 id="pythonchanges">Python Binding Changes</h3>
	<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->

	The following methods have been added:
	<ul>
	<li>SourceLocation.from_position (static)</li>
	<li>SourceLocation.__eq__ and SourceLocation.__ne__</li>
	<li>SourceRange.__eq__ and SourceRange.__ne__</li>
	<li>Diagnostic.category_number (property)</li>
	<li>Diagnostic.category_name (property)</li>
	<li>Diagnostic.option (property)</li>
	<li>Diagnostic.disable_option (property)</li>
	<li>CursorKind.is_translation_unit</li>
	<li>CursorKind.is_preprocessing</li>
	<li>CursorKind.is_unexposed</li>
	<li>Cursor.from_location (static)</li>
	<li>Cursor.underlying_typedef_type (property)</li>
	<li>Cursor.enum_type (property)</li>
	<li>Cursor.objc_type_encoding (property)</li>
	<li>Cursor.hash</li>
	<li>TypeKind.spelling</li>
	<li>Type.argument_types</li>
	<li>Type.element_type (property)</li>
	<li>Type.element_count (property)</li>
	<li>Type.is_function_variadic</li>
	<li>Type.is_pod</li>
	<li>Type.get_array_element_type</li>
	<li>Type.get_array_size</li>
	<li>Type.__eq__ and Type.__ne__</li>
	<li>File.from_name (static)</li>
	<li>File.__str__ and File.__repr__</li>
	</ul>

	<!-- ======================================================================= -->
	<h2 id="additionalinfo">Additional Information</h2>
	<!-- ======================================================================= -->

	<p>A wide variety of additional information is available on the
	<a href="http://clang.llvm.org/">Clang web page</a>. The web page contains
	versions of the API documentation which are up-to-date with the Subversion
	version of the source code. You can access versions of these documents specific
	to this release by going into the "<tt>clang/doc/</tt>" directory in the Clang
	tree.</p>

	<p>If you have any questions or comments about Clang, please feel free to
	contact us via the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">
	mailing list</a>.</p>


	</div>
	</body>
	</html>