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18<h1>Clang 3.0 Release Notes</h1>
19
20<img align=right src="http://llvm.org/img/DragonSmall.png"
21 width="136" height="136" alt="LLVM Dragon Logo">
22
23<ul>
24 <li><a href="#intro">Introduction</a></li>
25 <li><a href="#whatsnew">What's New in Clang 3.0?</a>
26 <ul>
27 <li><a href="#majorfeatures">Major New Features</a></li>
28 <li><a href="#cchanges">C Language Changes</a></li>
29 <li><a href="#cxxhanges">C++ Language Changes</a></li>
30 <li><a href="#objchanges">Objective-C Language Changes</a></li>
31 <li><a href="#apichanges">Internal API Changes</a></li>
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]32 </ul>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]33 </li>
34 <li><a href="#knownproblems">Known Problems</a></li>
35 <li><a href="#additionalinfo">Additional Information</a></li>
36</ul>
37
38<div class="doc_author">
39 <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
40</div>
41
42<!--
43<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
44release.<br>
45You may prefer the
46<a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
47Release Notes</a>.</h1>
48 -->
49
50<!-- ======================================================================= -->
51<h2 id="intro">Introduction</h2>
52<!-- ======================================================================= -->
53
54<p>This document contains the release notes for the Clang C/C++/Objective-C
55frontend, part of the LLVM Compiler Infrastructure, release 3.0. Here we
56describe the status of Clang in some detail, including major improvements from
57the previous release and new feature work. For the general LLVM release notes,
58see <a href ="http;//llvm.org/docs/ReleaseNotes.html">the LLVM
59 documentation</a>. All LLVM releases may be downloaded from the
60<a href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
61
62<p>For more information about Clang or LLVM, including information about the
63latest release, please check out the main please see the
64<a href="http://clang.llvm.org">Clang Web Site</a> or the
65<a href="http://llvm.org">LLVM Web Site</a>.
66
67<p>Note that if you are reading this file from a Subversion checkout or the main
68Clang web page, this document applies to the <i>next</i> release, not the
69current one. To see the release notes for a specific release, please see the
70<a href="http://llvm.org/releases/">releases page</a>.</p>
71
72<!-- ======================================================================= -->
73<h2 id="whatsnew">What's New in Clang 3.0?</h2>
74<!-- ======================================================================= -->
75
76<p>Some of the major new features and improvements to Clang are listed here.
77Generic improvements to Clang as a whole or two its underlying infrastructure
78are described first, followed by language-specific sections with improvements to
79Clang's support for those languages.</p>
80
81<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
82<h3 id="majorfeatures">Major New Features</h3>
83<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
84
Chandler Carrutha3950cc2011-11-28 08:41:06 +0000[diff] [blame]85<h4 id="notes">Unorganized Notes</h4>
86<p>These are completely random notes as I'm organizing my thoughts and reviewing
87the history. Anything still here needs to be distilled and turned into proper
88prose in a section of its own. When doing that, delete the notes.</p>
89<ul>
Chandler Carrutha3950cc2011-11-28 08:41:06 +0000[diff] [blame]90 <li>Building Clang on windows -- mingw, 32 and 64 bit, native windows builds,
91 cygwin. get chapuni to flesh out details.</li>
Chandler Carruth1af40222011-11-28 09:43:30 +0000[diff] [blame]92 <li>Compiling C/C++ w/ MinGW (32/64) and Cygwin on Windows -- chapuni</li>
93 <li>C++ -- Parsing and AST support for Windows Structured Exception
94 Handling.</li>
Chandler Carrutha3950cc2011-11-28 08:41:06 +0000[diff] [blame]95 <li>Uninitialized values Clang warning rewrite -- more accurate, faster, able
96 to differentiate between the possibility of an uninitialized use and the
97 certainty of an uninitialized use.</li>
Chandler Carrutha3950cc2011-11-28 08:41:06 +0000[diff] [blame]98 <li>Support for language specific address spaces</li>
Chandler Carruth1af40222011-11-28 09:43:30 +0000[diff] [blame]99 <li>Support for compiling on NetBSD systems -- Joerg Sonnenberger to fill
100 out</li>
Chandler Carrutha3950cc2011-11-28 08:41:06 +0000[diff] [blame]101 <li>Support for '--sysroot' based cross-compilation</li>
102 <li>Crash recovery handling for libclang clients -- Ted</li>
103 <li>Driver support for automatic preparation of reproduction steps for
104 compiler crashes -- Chad</li>
105 <li>OS Availability attribute -- r128127</li>
106 <li>GNU ObjectiveC Runtime support -- David Chisnall</li>
Chandler Carrutha3950cc2011-11-28 08:41:06 +0000[diff] [blame]107 <li>Diagnostic improvements bucket?
108 <ul>
109 <li>Emitting fewer include stacks</li>
Chandler Carruth1af40222011-11-28 09:43:30 +0000[diff] [blame]110 <li>Significantly better recovery when encountering misspelled type names
111 in a declaration context. r130082</li>
Chandler Carruthb6a1d9d2011-11-28 11:27:33 +0000[diff] [blame]112 <li>Expanded typo correction, most especially namespace-aware typo
113 correction in C++</li>
Chandler Carruth5d46a502011-11-28 12:24:21 +0000[diff] [blame]114 <li>Significantly more rich diagnostics w.r.t. macro expansion backtraces,
115 especially when macro arguments are involved.</li>
Chandler Carrutha3950cc2011-11-28 08:41:06 +0000[diff] [blame]116 </ul>
117 </li>
Douglas Gregor7c304c42011-11-28 17:50:36 +0000[diff] [blame]118 <li>libclang improvements bucket
Chandler Carruth7717ce42011-11-28 12:24:23 +0000[diff] [blame]119 <ul>
120 <li>Better Python Bindings</li>
121 <li>More AST coverage</li>
122 <li>Improved cursor support within macros, especially function-style macro
123 arguments.</li>
124 <li>Improved code completion surrounding macros, macro arguments, and
125 token pasting.</li>
Douglas Gregor7c304c42011-11-28 17:50:36 +0000[diff] [blame]126 <li>Improved code completion for in-class member functions.</li>
Chandler Carruth7717ce42011-11-28 12:24:23 +0000[diff] [blame]127 </ul>
128 </li>
Anna Zaksa5a6d1d2011-11-28 21:31:55 +0000[diff] [blame]129 <li>Basic C++ support in the static analyzer.</li>
Chandler Carruth1af40222011-11-28 09:43:30 +0000[diff] [blame]130 <li>Improved AST support for partially constructed nodes and incomplete
131 information for LLDB and other clients which dynamically build AST nodes.</li>
132 <li>Largely complete MSVC-compatible parsing mode -- fpichet</li>
133 <li>C1X -- static asserts and generic selections</li>
Chandler Carruth1af40222011-11-28 09:43:30 +0000[diff] [blame]134 <li>Memory reduction -- initializers, macro expansions, source locations,
135 etc.</li>
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]136 <li>The Embarcadero
137 <a href="http://docwiki.embarcadero.com/RADStudio/en/Is_lvalue_expr"><tt>__is_lvalue_expr</tt></a> and
138 <a href="http://docwiki.embarcadero.com/RADStudio/en/Is_rvalue_expr"><tt>__is_rvalue_expr</tt></a> expression traits.</li>
Chandler Carruthbba72a82011-11-28 10:57:14 +0000[diff] [blame]139 <li>CFI-based debug info -- nlewycky/espindola details</li>
Chandler Carruthb6a1d9d2011-11-28 11:27:33 +0000[diff] [blame]140 <li>ObjC ARC -- get a blurb from rjmccall</li>
Douglas Gregora1e3e8c2011-11-28 17:51:39 +0000[diff] [blame]141 <li>ObjC related result type/instancetype</li>
Chandler Carruth7717ce42011-11-28 12:24:23 +0000[diff] [blame]142 <li>Thread Safety attributes and correctness analysis added to Clang.</li>
Chandler Carruth7a1f1482011-11-28 13:02:29 +0000[diff] [blame]143 <li>NRVO for blocks.</li>
144 <li>Major improvements to the interactions between serializing and
145 deserializing the AST and the preprocessor -- argiris</li>
Chandler Carrutha3950cc2011-11-28 08:41:06 +0000[diff] [blame]146</ul>
147
Chandler Carruthb882a1d2011-11-28 21:56:30 +0000[diff] [blame]148<h4 id="driver">The Clang GCC-compatible command-line driver improved dramatically</h4>
149A great deal of work went into the GCC-compatible driver for the 3.0 release
150making it support more operating systems, emulate GCC behavior more accurately,
151and support a much broader range of Linux distributions out of the box.
152<ul>
153 <li>More accurate support for hardware architecture pre-defined macros (e.g.,
154 __i686__).</li>
155 <li>Robust library and header search paths for the vast majority of x86 and
156 x86-64 Linux distributions.</li>
157 <li>Improved support for newer Darwin platforms.</li>
158 <li>Partial support for <code>--sysroot=...</code> based cross-compiling on
159 Linux (and similar) host systems.</li>
160 <li>Improved support for locating and using libcxx when installed, especially
161 on Darwin.</li>
162 <!-- There are likely more Darwin-specific improvements to mention here? -->
163 <!-- What support was added for FreeBSD? NetBSD? Anything noteworthy? -->
164</ul>
165
Chandler Carruthc6f2af32011-11-28 19:17:25 +0000[diff] [blame]166<h4 id="ppcallbacks">Expanded support for instrumenting the preprocessor through
167 callbacks</h4>
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]168Several enhancements were made to the <code>PPCallbacks</code> interface to
169expand the information available to tools and library users of Clang that wish
170to introspect the preprocessing.
Chandler Carruthc6f2af32011-11-28 19:17:25 +0000[diff] [blame]171<ul>
172 <li>The exact text used between the <code>""</code>s or <code>&lt;&gt;</code>s is reported.</li>
173 <li>The header search path used to locate the header is reported.</li>
174 <li>Missing files during including headers reported.</li>
175 <li>The exact source range for expanded macros can be retrieved.</li>
176</ul>
177
Chandler Carrutha0df07d2011-11-28 22:17:58 +0000[diff] [blame^]178<!--
179Need Peter and/or Tanya to flesh this out if we want it in 3.0's notes.. The
180state isn't clear just from documentation or commit logs.
181
182<h4 id="opencl">Initial work to support compiling OpenCL with Clang</h4>
183Clang has some (limited) support for compiling OpenCL.
184-->
185
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]186<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
187<h3 id="cchanges">C Language Changes in Clang</h3>
188<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
189
190<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
191<h3 id="cxxchanges">C++ Language Changes in Clang</h3>
192<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
193
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]194<h4 id="cxx11changes">C++11 Feature Support</h4>
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]195<p>Clang 3.0 adds support for
196<a href="http://clang.llvm.org/cxx_status.html#cxx11">more of the language
197features</a> added in the latest ISO C++ standard, C++11. Use
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]198<code>-std=c++11</code> or <code>-std=gnu++11</code> to enable support for these
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]199features. The following are now considered to be of production quality:
200<ul>
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]201 <li>Range-based <code>for</code> loops</li>
202 <li>Alias declarations (a new syntax for <code>typedef</code> declarations),
203 including their <code>template</code> forms</li>
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]204 <li>Specifying default values for class data members within a class
205 definition</li>
206 <li>Constructors delegating to other constructors of the same class</li>
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]207 <li>The <code>override</code> context-sensitive keyword for virtual member
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]208 function declarations</li>
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]209 <li>Explicitly generating default function definitions with
210 <code>= default</code></li>
211 <li>The <code>nullptr</code> keyword, and the corresponding type</li>
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]212 <li>Raw string literals with arbitary delimiters (for instance,
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]213 <code>R"delim(str"ing)delim"</code>)</li>
214 <li>Unicode string literals (for instance, <code>U"\u1234"</code>) and the
215 <code>char16_t</code> and <code>char32_t</code> built-in types
216 <li><code>noexcept</code> expressions and the <code>noexcept</code> specifier
217 on function declarations</li>
218 <li><code>alignof</code> expressions and the <code>alignas</code> specifier on
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]219 variable declarations</li>
220 <li>A full set of <a href="http://clang.llvm.org/docs/LanguageExtensions.html#checking_type_traits">type traits</a>,
221 sufficient to support C++11 standard libraries</li>
222</ul>
Chandler Carruthbc02a042011-11-28 21:55:34 +0000[diff] [blame]223All warning and language selection flags which previously accepted
224<code>c++0x</code> now accept <code>c++11</code>. The old <code>c++0x</code>
225form remains as an alias.
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]226
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]227<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
228<h3 id="objcchanges">Objective-C Language Changes in Clang</h3>
229<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
230
231<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
232<h3 id="apichanges">Internal API Changes</h3>
233<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
234
Chandler Carruthc4dbffa2011-11-28 18:55:47 +0000[diff] [blame]235These are major API changes that have happened since the 2.9 release of Clang.
236If upgrading an external codebase that uses Clang as a library, this section
237should help get you past the largest hurdles of upgrading.
238
Chandler Carruth7d727b72011-11-28 19:06:34 +0000[diff] [blame]239<h4 id="macroexpansion">Switched terminology from "instantiation" to "expansion"
240 for macros</h4>
241A great deal of comments and code changes fell out of this, but also every API
242relating to macros with the word "instantiation" (or some variant thereof) was
243renamed. An incomplete list of the most note-worthy ones is here:
244<ul>
245 <li><code>MacroInstantiation</code> became <code>MacroExpansion</code></li>
246 <li><code>SourceManager::getInstantiationLoc</code> became
247 <code>SourceManager::getExpansionLoc</code></li>
248 <li><code>SourceManager::getInstantiationRange</code> became
249 <code>SourceManager::getExpansionRange</code></li>
250 <li><code>SourceManager::getImmediateInstantiationRange</code> became
251 <code>SourceManager::getImmediateExpansionRange</code></li>
252 <li><code>SourceManager::getDecomposedInstantiationLoc</code> became
253 <code>SourceManager::getDecomposedExpansionLoc</code></li>
254 <li><code>SourceManager::getInstantiationColumnNumber</code> became
255 <code>SourceManager::getExpansionColumnNumber</code></li>
256 <li><code>SourceManager::getInstantiationLineNumber</code> became
257 <code>SourceManager::getExpansionLineNumber</code></li>
258 <!-- TODO: Make this more complete! -->
259</ul>
260
Chandler Carruthc4dbffa2011-11-28 18:55:47 +0000[diff] [blame]261<h4 id="diagnosticrename">Diagnostic class names were shuffled</h4>
262<ul>
263 <li><code>Diagnostic</code> became <code>DiagnosticEngine</code></li>
264 <li><code>DiagnosticClient</code> became <code>DiagnosticConsumer</code></li>
265 <li><code>DiagnosticInfo</code> became <code>Diagnostic</code></li>
266</ul>
267Subclasses of <code>DiagnosticConsumer</code> were also then renamed to end with
268<code>Consumer</code>.
269
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]270<!-- ======================================================================= -->
271<h2 id="knownproblems">Significant Known Problems</h2>
272<!-- ======================================================================= -->
273
274<!-- ======================================================================= -->
275<h2 id="additionalinfo">Additional Information</h2>
276<!-- ======================================================================= -->
277
278<p>A wide variety of additional information is available on the
279<a href="http://clang.llvm.org/">Clang web page</a>. The web page contains
280versions of the API documentation which are up-to-date with the Subversion
281version of the source code. You can access versions of these documents specific
282to this release by going into the "<tt>clang/doc/</tt>" directory in the Clang
283tree.</p>
284
285<p>If you have any questions or comments about Clang, please feel free to
286contact us via the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">
287mailing list</a>.</p>
288
Chandler Carruth59abf062011-11-28 22:12:44 +0000[diff] [blame]289
290<!-- ======================================================================= -->
291<!-- Likely 3.1 release notes -->
292<!-- ======================================================================= -->
293<!--
294This is just a section to hold things that have already gotten started and
295should likely pick up proper release notes in 3.1.
296
297- C1X and C++11 atomics infrastructure and support
298- CUDA support?
299
300-->
301
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]302</body>
303</html>