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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>
   </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>Make analyzer (especially as used w/ warnings in Clang) much faster</li>
   <li>OpenCL support -- need details from Tanya and Peter -- separate language
   section?</li>
   <li>Building Clang on windows -- mingw, 32 and 64 bit, native windows builds,
   cygwin. get chapuni to flesh out details.</li>
   <li>Compiling C/C++ w/ MinGW (32/64) and Cygwin on Windows -- chapuni</li>
   <li>C++ -- Parsing and AST support for Windows Structured Exception
   Handling.</li>
   <li>C++11 -- noexcept (Sebastian Redl)</li>
   <li>Uninitialized values Clang warning rewrite -- more accurate, faster, able
   to differentiate between the possibility of an uninitialized use and the
   certainty of an uninitialized use.</li>
   <li>Enhancements to PPCallbacks
     <ul>
       <li>exact include paths</li>
       <li>source range for macro expansions</li>
     </ul>
   </li>
   <li>Support for language specific address spaces</li>
   <li>Support for compiling on NetBSD systems -- Joerg Sonnenberger to fill
   out</li>
   <li>Support for '--sysroot' based cross-compilation</li>
   <li>Crash recovery handling for libclang clients -- Ted</li>
   <li>Driver support for automatic preparation of reproduction steps for
   compiler crashes -- Chad</li>
   <li>OS Availability attribute -- r128127</li>
   <li>GNU ObjectiveC Runtime support -- David Chisnall</li>
   <li>C++11 -- override</li>
   <li>Diagnostic improvements bucket?
     <ul>
       <li>Emitting fewer include stacks</li>
       <li>Significantly better recovery when encountering misspelled type names
       in a declaration context. r130082</li>
       <li>Expanded typo correction, most especially namespace-aware typo
       correction in C++</li>
       <li>Significantly more rich diagnostics w.r.t. macro expansion backtraces,
       especially when macro arguments are involved.</li>
     </ul>
   </li>
   <li>libclang improvemenst bucket
     <ul>
       <li>Better Python Bindings</li>
       <li>More AST coverage</li>
       <li>Improved cursor support within macros, especially function-style macro
       arguments.</li>
       <li>Improved code completion surrounding macros, macro arguments, and
       token pasting.</li>
     </ul>
   </li>
   <li>C++ -- supported in the static analyzer: methods, new, constructors,
   destructors, etc.</li>
   <li>Improved AST support for partially constructed nodes and incomplete
   information for LLDB and other clients which dynamically build AST nodes.</li>
   <li>Largely complete MSVC-compatible parsing mode -- fpichet</li>
   <li>C1X -- static asserts and generic selections</li>
   <li>C++11 -- alias declarations -- zygoloid</li>
   <li>C++11 -- range-based-for loops -- zygoloid</li>
   <li>C++11 -- nullptr -- zygoloid</li>
   <li>C++11 -- in-class init -- zygoloid</li>
   <li>C++11 -- raw string literals -- zygoloid</li>
   <li>C++11 -- delegating ctors -- zygoloid/scshunt<li>
   <li>Memory reduction -- initializers, macro expansions, source locations,
   etc.</li>
   <li>Full set of type traits, sufficient to support C++11 standard libraries;
   also expression traits.</li>
   <li>CFI-based debug info -- nlewycky/espindola details</li>
   <li>ObjC ARC -- get a blurb from rjmccall</li>
   <li>API -- The term "instantiation" w.r.t. macros in APIs has been completely
   replaced by the term "expansion".</li>
   <li>Thread Safety attributes and correctness analysis added to Clang.</li>
 </ul>

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

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

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

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

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

 </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 {
	vertical-align: top;
	}
	</style>
	</head>
	<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>
	</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>Make analyzer (especially as used w/ warnings in Clang) much faster</li>
	<li>OpenCL support -- need details from Tanya and Peter -- separate language
	section?</li>
	<li>Building Clang on windows -- mingw, 32 and 64 bit, native windows builds,
	cygwin. get chapuni to flesh out details.</li>
	<li>Compiling C/C++ w/ MinGW (32/64) and Cygwin on Windows -- chapuni</li>
	<li>C++ -- Parsing and AST support for Windows Structured Exception
	Handling.</li>
	<li>C++11 -- noexcept (Sebastian Redl)</li>
	<li>Uninitialized values Clang warning rewrite -- more accurate, faster, able
	to differentiate between the possibility of an uninitialized use and the
	certainty of an uninitialized use.</li>
	<li>Enhancements to PPCallbacks
	<ul>
	<li>exact include paths</li>
	<li>source range for macro expansions</li>
	</ul>
	</li>
	<li>Support for language specific address spaces</li>
	<li>Support for compiling on NetBSD systems -- Joerg Sonnenberger to fill
	out</li>
	<li>Support for '--sysroot' based cross-compilation</li>
	<li>Crash recovery handling for libclang clients -- Ted</li>
	<li>Driver support for automatic preparation of reproduction steps for
	compiler crashes -- Chad</li>
	<li>OS Availability attribute -- r128127</li>
	<li>GNU ObjectiveC Runtime support -- David Chisnall</li>
	<li>C++11 -- override</li>
	<li>Diagnostic improvements bucket?
	<ul>
	<li>Emitting fewer include stacks</li>
	<li>Significantly better recovery when encountering misspelled type names
	in a declaration context. r130082</li>
	<li>Expanded typo correction, most especially namespace-aware typo
	correction in C++</li>
	<li>Significantly more rich diagnostics w.r.t. macro expansion backtraces,
	especially when macro arguments are involved.</li>
	</ul>
	</li>
	<li>libclang improvemenst bucket
	<ul>
	<li>Better Python Bindings</li>
	<li>More AST coverage</li>
	<li>Improved cursor support within macros, especially function-style macro
	arguments.</li>
	<li>Improved code completion surrounding macros, macro arguments, and
	token pasting.</li>
	</ul>
	</li>
	<li>C++ -- supported in the static analyzer: methods, new, constructors,
	destructors, etc.</li>
	<li>Improved AST support for partially constructed nodes and incomplete
	information for LLDB and other clients which dynamically build AST nodes.</li>
	<li>Largely complete MSVC-compatible parsing mode -- fpichet</li>
	<li>C1X -- static asserts and generic selections</li>
	<li>C++11 -- alias declarations -- zygoloid</li>
	<li>C++11 -- range-based-for loops -- zygoloid</li>
	<li>C++11 -- nullptr -- zygoloid</li>
	<li>C++11 -- in-class init -- zygoloid</li>
	<li>C++11 -- raw string literals -- zygoloid</li>
	<li>C++11 -- delegating ctors -- zygoloid/scshunt<li>
	<li>Memory reduction -- initializers, macro expansions, source locations,
	etc.</li>
	<li>Full set of type traits, sufficient to support C++11 standard libraries;
	also expression traits.</li>
	<li>CFI-based debug info -- nlewycky/espindola details</li>
	<li>ObjC ARC -- get a blurb from rjmccall</li>
	<li>API -- The term "instantiation" w.r.t. macros in APIs has been completely
	replaced by the term "expansion".</li>
	<li>Thread Safety attributes and correctness analysis added to Clang.</li>
	</ul>

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

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

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

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

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

	</body>
	</html>