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 <h1>Clang 3.0 Release Notes</h1>

 <img align=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 3.0?</a>
     <ul>
       <li><a href="#majorfeatures">Major New Features</a></li>
       <li><a href="#cchanges">C Language Changes</a></li>
       <li><a href="#cxxhanges">C++ Language Changes</a></li>
       <li><a href="#objchanges">Objective-C Language Changes</a></li>
       <li><a href="#apichanges">Internal API Changes</a></li>
     </ul>
   </li>
   <li><a href="#knownproblems">Known Problems</a></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>

 <!--
 <h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
 release.<br>
 You may prefer the
 <a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
 Release Notes</a>.</h1>
  -->

 <!-- ======================================================================= -->
 <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 3.0.  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 3.0?</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="majorfeatures">Major New Features</h3>
 <!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->

 <h4 id="notes">Unorganized Notes</h4>
 <p>These are completely random notes as I'm organizing my thoughts and reviewing
 the history. Anything still here needs to be distilled and turned into proper
 prose in a section of its own. When doing that, delete the notes.</p>
 <ul>
   <li>OS Availability attribute -- r128127</li>
   <li>GNU ObjectiveC Runtime support -- David Chisnall</li>
   <li>Improved AST support for partially constructed nodes and incomplete
   information for LLDB and other clients which dynamically build AST nodes.</li>
   <li>Memory reduction -- initializers, macro expansions, source locations,
   etc.</li>
   <li>ObjC ARC -- get a blurb from rjmccall</li>
   <li>ObjC related result type/instancetype</li>
   <li>Thread Safety attributes and correctness analysis added to Clang.</li>
   <li>Major improvements to the interactions between serializing and
   deserializing the AST and the preprocessor -- argiris</li>
 </ul>

 <h4 id="diagnostics">A multitude of improvements to Clang's diagnostics</h4>
 Clang's diagnostics are constantly being improved to catch more issues, explain
 them more clearly, and provide more accurate source information about them.
 A few improvements since the 2.9 release that have a particularly high impact:
 <ul>
   <li>Substantially shorter messages due to better recovery, fewer include
   stacks, and tuning verbose features such as 'a.k.a.' type printing.</li>
   <li>
     Able to recover and correct from misspelled type names at the begging of statements. For example, Clang now emits:
     <pre><b>t.c:6:3: <span class="error">error:</span> use of undeclared identifier 'integer'; did you mean 'Integer'?</b>
   integer *i = 0;
   <span class="caret">^~~~~~~</span>
   Integer
 <b>t.c:1:13: note:</b> 'Integer' declared here
 typedef int Integer;
             <span class="caret">^</span></pre>
   </li>
   <li>Expanded typo correction to (among other improvements) look across
   namespaces and suggest namespace qualifiers in addition to misspellings of the
   identifier itself.</li>
   <li>More rich macro expansion backtraces and some (limited) fix-it hints when
   diagnostics stem from macro arguments.</li>
   <li>Many new warnings have been added to catch common, bug-prone code
   patterns.</li>
   <li>Uninitialized values Clang warning was rewritten to be more accurate,
   faster, and able to differentiate between the <em>possibility</em> of an
   uninitialized use and the <em>certainty</em> of an uninitialized use.</li>
 </ul>

 <h4 id="libclang">This release saw significant improvements to <code>libclang</code></h4>
 <ul>
   <li>A broader set of the <code>libclang</code> API is exposed in the Python
   bindings.</li>
   <li>Much more of the Clang AST is exposed through <code>libclang</code>'s APIs
   and cursors.</li>
   <li>Cursors can now walk more effectively through macros, especially arguments
   to function-style macros, and resolve to the underlying AST.</li>
   <li>Improved code completion surrounding macros, macro arguments, and
   token pasting.</li>
   <li>Improved code completion for in-class member functions.</li>
   <li>Crash recovery for <code>libclang</code> clients.</li>
   <!-- Doug or Ted may want to flesh this out if there are relevant details I'm
   glossing over... -->
 </ul>

 <h4 id="driver">The Clang GCC-compatible command-line driver improved dramatically</h4>
 A great deal of work went into the GCC-compatible driver for the 3.0 release
 making it support more operating systems, emulate GCC behavior more accurately,
 and support a much broader range of Linux distributions out of the box.
 <ul>
   <li>More accurate support for hardware architecture pre-defined macros (e.g.,
   __i686__).</li>
   <li>Robust library and header search paths for the vast majority of x86 and
   x86-64 Linux distributions.</li>
   <li>Improved support for newer Darwin platforms.</li>
   <li>Partial support for <code>--sysroot=...</code> based cross-compiling on
   Linux (and similar) host systems.</li>
   <li>Improved support for locating and using libcxx when installed, especially
   on Darwin.</li>
   <!-- There are likely more Darwin-specific improvements to mention here? -->
   <!-- What support was added for FreeBSD? NetBSD? Anything noteworthy? -->
   <li>Automatic detection of Clang crashes in the driver and preparation of
   reproduction steps for filing bug reports.</li><!-- Chad, feel free to add
   more details here. -->
 </ul>

 <h4 id="ppcallbacks">Expanded support for instrumenting the preprocessor through
   callbacks</h4>
 Several enhancements were made to the <code>PPCallbacks</code> interface to
 expand the information available to tools and library users of Clang that wish
 to introspect the preprocessing.
 <ul>
   <li>The exact text used between the <code>""</code>s or <code>&lt;&gt;</code>s is reported.</li>
   <li>The header search path used to locate the header is reported.</li>
   <li>Missing files during including headers reported.</li>
   <li>The exact source range for expanded macros can be retrieved.</li>
 </ul>

 <h4 id="windows">Clang is building and tested regularly on Windows and can
   compile limited subsets of code on Windows</h4>
 Clang is regularly built and tested on a variety of Windows platforms including
 MinGW 32-bit and 64-bit, Cygwin, and natively with MSVC. In addition, Clang can
 be used as a compiler in a few Windows contexts.
 <ul>
   <li>Normal compilation supported for the MinGW target platform, in both 32-bit
   and 64-bit, and the Cygwin target platform.</li>
   <li>Parsing and AST support for Windows Structured Exception Handling.</li>
   <li>New -fms-compatibility flag to handle MSVC constructs that could change
   the meaning of an otherwise well formed program</li>
   <li>clang can now parse all the MSVC 2010 standard C++ header files
   in the nominal case, (still need to specifiy -nobuiltininc for some headers).</li>
   <li>Improved support for MFC code parsing, (still a work in progress).</li>
 </ul>

 <!--
 Nick and/or Rafael will flesh this out into a bit about the CFI / DWARF
 improvements.

 <h4 id="dwarf">DWARF Exception Handling uses CFI...</h4>
 Rafael had a zillion patches to emit stuff using .cfi directives... =]

 -->

 <!--
 Need Peter and/or Tanya to flesh this out if we want it in 3.0's notes.. The
 state isn't clear just from documentation or commit logs.

 <h4 id="opencl">Initial work to support compiling OpenCL with Clang</h4>
 Clang has some (limited) support for compiling OpenCL.
 -->

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

 <h4 id="c1xchanges">C1X Feature Support</h4>

 <p>Clang 3.0 adds support for the
 <a href="http://clang.llvm.org/docs/LanguageExtensions.html#c1x">
 <code>_Alignas</code>, <code>_Generic</code>, and <code>_Static_assert</code>
 keywords</a>, drafted for inclusion in the next C standard, which is
 provisionally known as C1X. Use <code>-std=c1x</code> or <code>-std=gnu1x</code>
 to enable support for the new language standard. These features are
 backwards-compatible and are available as an extension in all language
 modes.</p>

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

 <h4 id="cxx11changes">C++11 Feature Support</h4>
 <p>Clang 3.0 adds support for
 <a href="http://clang.llvm.org/cxx_status.html#cxx11">more of the language
 features</a> added in the latest ISO C++ standard, C++11. Use
 <code>-std=c++11</code> or <code>-std=gnu++11</code> to enable support for these
 features. The following are now considered to be of production quality:
 <ul>
   <li>Range-based <code>for</code> loops</li>
   <li>Alias declarations (a new syntax for <code>typedef</code> declarations),
   including their <code>template</code> forms</li>
   <li>Specifying default values for class data members within a class
   definition</li>
   <li>Constructors delegating to other constructors of the same class</li>
   <li>The <code>override</code> context-sensitive keyword for virtual member
   function declarations</li>
   <li>Explicitly generating default function definitions with
   <code>= default</code></li>
   <li>The <code>nullptr</code> keyword, and the corresponding type</li>
   <li>Raw string literals with arbitary delimiters (for instance,
   <code>R"delim(str"ing)delim"</code>)</li>
   <li>Unicode string literals (for instance, <code>U"\u1234"</code>) and the
   <code>char16_t</code> and <code>char32_t</code> built-in types
   <li><code>noexcept</code> expressions and the <code>noexcept</code> specifier
   on function declarations</li>
   <li><code>alignof</code> expressions and the <code>alignas</code> specifier on
   variable declarations</li>
   <li>A full set of <a href="http://clang.llvm.org/docs/LanguageExtensions.html#checking_type_traits">type traits</a>,
   sufficient to support C++11 standard libraries</li>
 </ul>
 All warning and language selection flags which previously accepted
 <code>c++0x</code> now accept <code>c++11</code>. The old <code>c++0x</code>
 form remains as an alias.

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

 <!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
 <h3 id="apichanges">Internal API Changes</h3>
 <!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->

 These are major API changes that have happened since the 2.9 release of Clang.
 If upgrading an external codebase that uses Clang as a library, this section
 should help get you past the largest hurdles of upgrading.

 <h4 id="macroexpansion">Switched terminology from "instantiation" to "expansion"
   for macros</h4>
 A great deal of comments and code changes fell out of this, but also every API
 relating to macros with the word "instantiation" (or some variant thereof) was
 renamed. An incomplete list of the most note-worthy ones is here:
 <ul>
   <li><code>MacroInstantiation</code> became <code>MacroExpansion</code></li>
   <li><code>SourceManager::getInstantiationLoc</code> became
   <code>SourceManager::getExpansionLoc</code></li>
   <li><code>SourceManager::getInstantiationRange</code> became
   <code>SourceManager::getExpansionRange</code></li>
   <li><code>SourceManager::getImmediateInstantiationRange</code> became
   <code>SourceManager::getImmediateExpansionRange</code></li>
   <li><code>SourceManager::getDecomposedInstantiationLoc</code> became
   <code>SourceManager::getDecomposedExpansionLoc</code></li>
   <li><code>SourceManager::getInstantiationColumnNumber</code> became
   <code>SourceManager::getExpansionColumnNumber</code></li>
   <li><code>SourceManager::getInstantiationLineNumber</code> became
   <code>SourceManager::getExpansionLineNumber</code></li>
   <!-- TODO: Make this more complete! -->
 </ul>

 <h4 id="diagnosticrename">Diagnostic class names were shuffled</h4>
 <ul>
   <li><code>Diagnostic</code> became <code>DiagnosticEngine</code></li>
   <li><code>DiagnosticClient</code> became <code>DiagnosticConsumer</code></li>
   <li><code>DiagnosticInfo</code> became <code>Diagnostic</code></li>
 </ul>
 Subclasses of <code>DiagnosticConsumer</code> were also then renamed to end with
 <code>Consumer</code>.

 <!-- ======================================================================= -->
 <h2 id="knownproblems">Significant Known Problems</h2>
 <!-- ======================================================================= -->

 <!-- ======================================================================= -->
 <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>


 <!-- ======================================================================= -->
 <!-- Likely 3.1 release notes -->
 <!-- ======================================================================= -->
 <!--
 This is just a section to hold things that have already gotten started and
 should likely pick up proper release notes in 3.1.

 - C1X and C++11 atomics infrastructure and support
 - CUDA support?

 -->

 </body>
 </html>
	<html>
	<head>
	<title>Clang 3.0 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 {
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	}
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	<body>

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

	<div id="content">

	<h1>Clang 3.0 Release Notes</h1>

	<img align=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 3.0?</a>
	<ul>
	<li><a href="#majorfeatures">Major New Features</a></li>
	<li><a href="#cchanges">C Language Changes</a></li>
	<li><a href="#cxxhanges">C++ Language Changes</a></li>
	<li><a href="#objchanges">Objective-C Language Changes</a></li>
	<li><a href="#apichanges">Internal API Changes</a></li>
	</ul>
	</li>
	<li><a href="#knownproblems">Known Problems</a></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>

	<!--
	<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
	release.<br>
	You may prefer the
	<a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
	Release Notes</a>.</h1>
	-->

	<!-- ======================================================================= -->
	<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 3.0. 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 3.0?</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="majorfeatures">Major New Features</h3>
	<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->

	<h4 id="notes">Unorganized Notes</h4>
	<p>These are completely random notes as I'm organizing my thoughts and reviewing
	the history. Anything still here needs to be distilled and turned into proper
	prose in a section of its own. When doing that, delete the notes.</p>
	<ul>
	<li>OS Availability attribute -- r128127</li>
	<li>GNU ObjectiveC Runtime support -- David Chisnall</li>
	<li>Improved AST support for partially constructed nodes and incomplete
	information for LLDB and other clients which dynamically build AST nodes.</li>
	<li>Memory reduction -- initializers, macro expansions, source locations,
	etc.</li>
	<li>ObjC ARC -- get a blurb from rjmccall</li>
	<li>ObjC related result type/instancetype</li>
	<li>Thread Safety attributes and correctness analysis added to Clang.</li>
	<li>Major improvements to the interactions between serializing and
	deserializing the AST and the preprocessor -- argiris</li>
	</ul>

	<h4 id="diagnostics">A multitude of improvements to Clang's diagnostics</h4>
	Clang's diagnostics are constantly being improved to catch more issues, explain
	them more clearly, and provide more accurate source information about them.
	A few improvements since the 2.9 release that have a particularly high impact:
	<ul>
	<li>Substantially shorter messages due to better recovery, fewer include
	stacks, and tuning verbose features such as 'a.k.a.' type printing.</li>
	<li>
	Able to recover and correct from misspelled type names at the begging of statements. For example, Clang now emits:
	<pre><b>t.c:6:3: <span class="error">error:</span> use of undeclared identifier 'integer'; did you mean 'Integer'?</b>
	integer *i = 0;
	<span class="caret">^~~~~~~</span>
	Integer
	<b>t.c:1:13: note:</b> 'Integer' declared here
	typedef int Integer;
	<span class="caret">^</span></pre>
	</li>
	<li>Expanded typo correction to (among other improvements) look across
	namespaces and suggest namespace qualifiers in addition to misspellings of the
	identifier itself.</li>
	<li>More rich macro expansion backtraces and some (limited) fix-it hints when
	diagnostics stem from macro arguments.</li>
	<li>Many new warnings have been added to catch common, bug-prone code
	patterns.</li>
	<li>Uninitialized values Clang warning was rewritten to be more accurate,
	faster, and able to differentiate between the <em>possibility</em> of an
	uninitialized use and the <em>certainty</em> of an uninitialized use.</li>
	</ul>

	<h4 id="libclang">This release saw significant improvements to <code>libclang</code></h4>
	<ul>
	<li>A broader set of the <code>libclang</code> API is exposed in the Python
	bindings.</li>
	<li>Much more of the Clang AST is exposed through <code>libclang</code>'s APIs
	and cursors.</li>
	<li>Cursors can now walk more effectively through macros, especially arguments
	to function-style macros, and resolve to the underlying AST.</li>
	<li>Improved code completion surrounding macros, macro arguments, and
	token pasting.</li>
	<li>Improved code completion for in-class member functions.</li>
	<li>Crash recovery for <code>libclang</code> clients.</li>
	<!-- Doug or Ted may want to flesh this out if there are relevant details I'm
	glossing over... -->
	</ul>

	<h4 id="driver">The Clang GCC-compatible command-line driver improved dramatically</h4>
	A great deal of work went into the GCC-compatible driver for the 3.0 release
	making it support more operating systems, emulate GCC behavior more accurately,
	and support a much broader range of Linux distributions out of the box.
	<ul>
	<li>More accurate support for hardware architecture pre-defined macros (e.g.,
	__i686__).</li>
	<li>Robust library and header search paths for the vast majority of x86 and
	x86-64 Linux distributions.</li>
	<li>Improved support for newer Darwin platforms.</li>
	<li>Partial support for <code>--sysroot=...</code> based cross-compiling on
	Linux (and similar) host systems.</li>
	<li>Improved support for locating and using libcxx when installed, especially
	on Darwin.</li>
	<!-- There are likely more Darwin-specific improvements to mention here? -->
	<!-- What support was added for FreeBSD? NetBSD? Anything noteworthy? -->
	<li>Automatic detection of Clang crashes in the driver and preparation of
	reproduction steps for filing bug reports.</li><!-- Chad, feel free to add
	more details here. -->
	</ul>

	<h4 id="ppcallbacks">Expanded support for instrumenting the preprocessor through
	callbacks</h4>
	Several enhancements were made to the <code>PPCallbacks</code> interface to
	expand the information available to tools and library users of Clang that wish
	to introspect the preprocessing.
	<ul>
	<li>The exact text used between the <code>""</code>s or <code><></code>s is reported.</li>
	<li>The header search path used to locate the header is reported.</li>
	<li>Missing files during including headers reported.</li>
	<li>The exact source range for expanded macros can be retrieved.</li>
	</ul>

	<h4 id="windows">Clang is building and tested regularly on Windows and can
	compile limited subsets of code on Windows</h4>
	Clang is regularly built and tested on a variety of Windows platforms including
	MinGW 32-bit and 64-bit, Cygwin, and natively with MSVC. In addition, Clang can
	be used as a compiler in a few Windows contexts.
	<ul>
	<li>Normal compilation supported for the MinGW target platform, in both 32-bit
	and 64-bit, and the Cygwin target platform.</li>
	<li>Parsing and AST support for Windows Structured Exception Handling.</li>
	<li>New -fms-compatibility flag to handle MSVC constructs that could change
	the meaning of an otherwise well formed program</li>
	<li>clang can now parse all the MSVC 2010 standard C++ header files
	in the nominal case, (still need to specifiy -nobuiltininc for some headers).</li>
	<li>Improved support for MFC code parsing, (still a work in progress).</li>
	</ul>

	<!--
	Nick and/or Rafael will flesh this out into a bit about the CFI / DWARF
	improvements.

	<h4 id="dwarf">DWARF Exception Handling uses CFI...</h4>
	Rafael had a zillion patches to emit stuff using .cfi directives... =]

	-->

	<!--
	Need Peter and/or Tanya to flesh this out if we want it in 3.0's notes.. The
	state isn't clear just from documentation or commit logs.

	<h4 id="opencl">Initial work to support compiling OpenCL with Clang</h4>
	Clang has some (limited) support for compiling OpenCL.
	-->

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

	<h4 id="c1xchanges">C1X Feature Support</h4>

	<p>Clang 3.0 adds support for the
	<a href="http://clang.llvm.org/docs/LanguageExtensions.html#c1x">
	<code>_Alignas</code>, <code>_Generic</code>, and <code>_Static_assert</code>
	keywords</a>, drafted for inclusion in the next C standard, which is
	provisionally known as C1X. Use <code>-std=c1x</code> or <code>-std=gnu1x</code>
	to enable support for the new language standard. These features are
	backwards-compatible and are available as an extension in all language
	modes.</p>

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

	<h4 id="cxx11changes">C++11 Feature Support</h4>
	<p>Clang 3.0 adds support for
	<a href="http://clang.llvm.org/cxx_status.html#cxx11">more of the language
	features</a> added in the latest ISO C++ standard, C++11. Use
	<code>-std=c++11</code> or <code>-std=gnu++11</code> to enable support for these
	features. The following are now considered to be of production quality:
	<ul>
	<li>Range-based <code>for</code> loops</li>
	<li>Alias declarations (a new syntax for <code>typedef</code> declarations),
	including their <code>template</code> forms</li>
	<li>Specifying default values for class data members within a class
	definition</li>
	<li>Constructors delegating to other constructors of the same class</li>
	<li>The <code>override</code> context-sensitive keyword for virtual member
	function declarations</li>
	<li>Explicitly generating default function definitions with
	<code>= default</code></li>
	<li>The <code>nullptr</code> keyword, and the corresponding type</li>
	<li>Raw string literals with arbitary delimiters (for instance,
	<code>R"delim(str"ing)delim"</code>)</li>
	<li>Unicode string literals (for instance, <code>U"\u1234"</code>) and the
	<code>char16_t</code> and <code>char32_t</code> built-in types
	<li><code>noexcept</code> expressions and the <code>noexcept</code> specifier
	on function declarations</li>
	<li><code>alignof</code> expressions and the <code>alignas</code> specifier on
	variable declarations</li>
	<li>A full set of <a href="http://clang.llvm.org/docs/LanguageExtensions.html#checking_type_traits">type traits</a>,
	sufficient to support C++11 standard libraries</li>
	</ul>
	All warning and language selection flags which previously accepted
	<code>c++0x</code> now accept <code>c++11</code>. The old <code>c++0x</code>
	form remains as an alias.

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

	<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
	<h3 id="apichanges">Internal API Changes</h3>
	<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->

	These are major API changes that have happened since the 2.9 release of Clang.
	If upgrading an external codebase that uses Clang as a library, this section
	should help get you past the largest hurdles of upgrading.

	<h4 id="macroexpansion">Switched terminology from "instantiation" to "expansion"
	for macros</h4>
	A great deal of comments and code changes fell out of this, but also every API
	relating to macros with the word "instantiation" (or some variant thereof) was
	renamed. An incomplete list of the most note-worthy ones is here:
	<ul>
	<li><code>MacroInstantiation</code> became <code>MacroExpansion</code></li>
	<li><code>SourceManager::getInstantiationLoc</code> became
	<code>SourceManager::getExpansionLoc</code></li>
	<li><code>SourceManager::getInstantiationRange</code> became
	<code>SourceManager::getExpansionRange</code></li>
	<li><code>SourceManager::getImmediateInstantiationRange</code> became
	<code>SourceManager::getImmediateExpansionRange</code></li>
	<li><code>SourceManager::getDecomposedInstantiationLoc</code> became
	<code>SourceManager::getDecomposedExpansionLoc</code></li>
	<li><code>SourceManager::getInstantiationColumnNumber</code> became
	<code>SourceManager::getExpansionColumnNumber</code></li>
	<li><code>SourceManager::getInstantiationLineNumber</code> became
	<code>SourceManager::getExpansionLineNumber</code></li>
	<!-- TODO: Make this more complete! -->
	</ul>

	<h4 id="diagnosticrename">Diagnostic class names were shuffled</h4>
	<ul>
	<li><code>Diagnostic</code> became <code>DiagnosticEngine</code></li>
	<li><code>DiagnosticClient</code> became <code>DiagnosticConsumer</code></li>
	<li><code>DiagnosticInfo</code> became <code>Diagnostic</code></li>
	</ul>
	Subclasses of <code>DiagnosticConsumer</code> were also then renamed to end with
	<code>Consumer</code>.

	<!-- ======================================================================= -->
	<h2 id="knownproblems">Significant Known Problems</h2>
	<!-- ======================================================================= -->

	<!-- ======================================================================= -->
	<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>


	<!-- ======================================================================= -->
	<!-- Likely 3.1 release notes -->
	<!-- ======================================================================= -->
	<!--
	This is just a section to hold things that have already gotten started and
	should likely pick up proper release notes in 3.1.

	- C1X and C++11 atomics infrastructure and support
	- CUDA support?

	-->

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