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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 Carrutha3950cc2011-11-28 08:41:06 +0000[diff] [blame]99 <li>Driver support for automatic preparation of reproduction steps for
100 compiler crashes -- Chad</li>
101 <li>OS Availability attribute -- r128127</li>
102 <li>GNU ObjectiveC Runtime support -- David Chisnall</li>
Anna Zaksa5a6d1d2011-11-28 21:31:55 +0000[diff] [blame]103 <li>Basic C++ support in the static analyzer.</li>
Chandler Carruth1af40222011-11-28 09:43:30 +0000[diff] [blame]104 <li>Improved AST support for partially constructed nodes and incomplete
105 information for LLDB and other clients which dynamically build AST nodes.</li>
106 <li>Largely complete MSVC-compatible parsing mode -- fpichet</li>
107 <li>C1X -- static asserts and generic selections</li>
Chandler Carruth1af40222011-11-28 09:43:30 +0000[diff] [blame]108 <li>Memory reduction -- initializers, macro expansions, source locations,
109 etc.</li>
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]110 <li>The Embarcadero
111 <a href="http://docwiki.embarcadero.com/RADStudio/en/Is_lvalue_expr"><tt>__is_lvalue_expr</tt></a> and
112 <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]113 <li>CFI-based debug info -- nlewycky/espindola details</li>
Chandler Carruthb6a1d9d2011-11-28 11:27:33 +0000[diff] [blame]114 <li>ObjC ARC -- get a blurb from rjmccall</li>
Douglas Gregora1e3e8c2011-11-28 17:51:39 +0000[diff] [blame]115 <li>ObjC related result type/instancetype</li>
Chandler Carruth7717ce42011-11-28 12:24:23 +0000[diff] [blame]116 <li>Thread Safety attributes and correctness analysis added to Clang.</li>
Chandler Carruth7a1f1482011-11-28 13:02:29 +0000[diff] [blame]117 <li>NRVO for blocks.</li>
118 <li>Major improvements to the interactions between serializing and
119 deserializing the AST and the preprocessor -- argiris</li>
Chandler Carrutha3950cc2011-11-28 08:41:06 +0000[diff] [blame]120</ul>
121
Chandler Carruth58f2cbc2011-11-28 22:34:59 +0000[diff] [blame]122<h4 id="diagnostics">A multitude of improvements to Clang's diagnostics</h4>
123Clang's diagnostics are constantly being improved to catch more issues, explain
124them more clearly, and provide more accurate source information about them.
125A few improvements since the 2.9 release that have a particularly high impact:
126<ul>
127 <li>Substantially shorter messages due to better recovery, fewer include
128 stacks, and tuning verbose features such as 'a.k.a.' type printing.</li>
129 <li>
130 Able to recover and correct from misspelled type names at the begging of statements. For example, Clang now emits:
131 <code>t.c:6:3: error: use of undeclared identifier 'integer'; did you mean
132'Integer'?
133 integer *i = 0;
134 ^~~~~~~
135 Integer
136t.c:1:13: note: 'Integer' declared here
137typedef int Integer;
138 ^</code>
139 </li>
140 <li>Expanded typo correction to (among other improvements) look across
141 namespaces and suggest namespace qualifiers in addition to misspellings of the
142 identifier itself.</li>
143 <li>More rich macro expansion backtraces and some (limited) fix-it hints when
144 diagnostics stem from macro arguments.</li>
145</ul>
146
Chandler Carruth9a167122011-11-28 22:43:32 +0000[diff] [blame^]147<h4 id="libclang">This release saw significant improvements to <code>libclang</code></h4>
148<ul>
149 <li>A broader set of the <code>libclang</code> API is exposed in the Python
150 bindings.</li>
151 <li>Much more of the Clang AST is exposed through <code>libclang</code>'s APIs
152 and cursors.</li>
153 <li>Cursors can now walk more effectively through macros, especially arguments
154 to function-style macros, and resolve to the underlying AST.</li>
155 <li>Improved code completion surrounding macros, macro arguments, and
156 token pasting.</li>
157 <li>Improved code completion for in-class member functions.</li>
158 <li>Crash recovery for <code>libclang</code> clients.</li>
159 <!-- Doug or Ted may want to flesh this out if there are relevant details I'm
160 glossing over... -->
161</ul>
162
Chandler Carruthb882a1d2011-11-28 21:56:30 +0000[diff] [blame]163<h4 id="driver">The Clang GCC-compatible command-line driver improved dramatically</h4>
164A great deal of work went into the GCC-compatible driver for the 3.0 release
165making it support more operating systems, emulate GCC behavior more accurately,
166and support a much broader range of Linux distributions out of the box.
167<ul>
168 <li>More accurate support for hardware architecture pre-defined macros (e.g.,
169 __i686__).</li>
170 <li>Robust library and header search paths for the vast majority of x86 and
171 x86-64 Linux distributions.</li>
172 <li>Improved support for newer Darwin platforms.</li>
173 <li>Partial support for <code>--sysroot=...</code> based cross-compiling on
174 Linux (and similar) host systems.</li>
175 <li>Improved support for locating and using libcxx when installed, especially
176 on Darwin.</li>
177 <!-- There are likely more Darwin-specific improvements to mention here? -->
178 <!-- What support was added for FreeBSD? NetBSD? Anything noteworthy? -->
179</ul>
180
Chandler Carruthc6f2af32011-11-28 19:17:25 +0000[diff] [blame]181<h4 id="ppcallbacks">Expanded support for instrumenting the preprocessor through
182 callbacks</h4>
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]183Several enhancements were made to the <code>PPCallbacks</code> interface to
184expand the information available to tools and library users of Clang that wish
185to introspect the preprocessing.
Chandler Carruthc6f2af32011-11-28 19:17:25 +0000[diff] [blame]186<ul>
187 <li>The exact text used between the <code>""</code>s or <code>&lt;&gt;</code>s is reported.</li>
188 <li>The header search path used to locate the header is reported.</li>
189 <li>Missing files during including headers reported.</li>
190 <li>The exact source range for expanded macros can be retrieved.</li>
191</ul>
192
Chandler Carrutha0df07d2011-11-28 22:17:58 +0000[diff] [blame]193<!--
194Need Peter and/or Tanya to flesh this out if we want it in 3.0's notes.. The
195state isn't clear just from documentation or commit logs.
196
197<h4 id="opencl">Initial work to support compiling OpenCL with Clang</h4>
198Clang has some (limited) support for compiling OpenCL.
199-->
200
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]201<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
202<h3 id="cchanges">C Language Changes in Clang</h3>
203<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
204
205<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
206<h3 id="cxxchanges">C++ Language Changes in Clang</h3>
207<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
208
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]209<h4 id="cxx11changes">C++11 Feature Support</h4>
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]210<p>Clang 3.0 adds support for
211<a href="http://clang.llvm.org/cxx_status.html#cxx11">more of the language
212features</a> added in the latest ISO C++ standard, C++11. Use
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]213<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]214features. The following are now considered to be of production quality:
215<ul>
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]216 <li>Range-based <code>for</code> loops</li>
217 <li>Alias declarations (a new syntax for <code>typedef</code> declarations),
218 including their <code>template</code> forms</li>
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]219 <li>Specifying default values for class data members within a class
220 definition</li>
221 <li>Constructors delegating to other constructors of the same class</li>
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]222 <li>The <code>override</code> context-sensitive keyword for virtual member
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]223 function declarations</li>
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]224 <li>Explicitly generating default function definitions with
225 <code>= default</code></li>
226 <li>The <code>nullptr</code> keyword, and the corresponding type</li>
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]227 <li>Raw string literals with arbitary delimiters (for instance,
Chandler Carruthf16d7252011-11-28 21:47:51 +0000[diff] [blame]228 <code>R"delim(str"ing)delim"</code>)</li>
229 <li>Unicode string literals (for instance, <code>U"\u1234"</code>) and the
230 <code>char16_t</code> and <code>char32_t</code> built-in types
231 <li><code>noexcept</code> expressions and the <code>noexcept</code> specifier
232 on function declarations</li>
233 <li><code>alignof</code> expressions and the <code>alignas</code> specifier on
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]234 variable declarations</li>
235 <li>A full set of <a href="http://clang.llvm.org/docs/LanguageExtensions.html#checking_type_traits">type traits</a>,
236 sufficient to support C++11 standard libraries</li>
237</ul>
Chandler Carruthbc02a042011-11-28 21:55:34 +0000[diff] [blame]238All warning and language selection flags which previously accepted
239<code>c++0x</code> now accept <code>c++11</code>. The old <code>c++0x</code>
240form remains as an alias.
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]241
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]242<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
243<h3 id="objcchanges">Objective-C Language Changes in Clang</h3>
244<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
245
246<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
247<h3 id="apichanges">Internal API Changes</h3>
248<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
249
Chandler Carruthc4dbffa2011-11-28 18:55:47 +0000[diff] [blame]250These are major API changes that have happened since the 2.9 release of Clang.
251If upgrading an external codebase that uses Clang as a library, this section
252should help get you past the largest hurdles of upgrading.
253
Chandler Carruth7d727b72011-11-28 19:06:34 +0000[diff] [blame]254<h4 id="macroexpansion">Switched terminology from "instantiation" to "expansion"
255 for macros</h4>
256A great deal of comments and code changes fell out of this, but also every API
257relating to macros with the word "instantiation" (or some variant thereof) was
258renamed. An incomplete list of the most note-worthy ones is here:
259<ul>
260 <li><code>MacroInstantiation</code> became <code>MacroExpansion</code></li>
261 <li><code>SourceManager::getInstantiationLoc</code> became
262 <code>SourceManager::getExpansionLoc</code></li>
263 <li><code>SourceManager::getInstantiationRange</code> became
264 <code>SourceManager::getExpansionRange</code></li>
265 <li><code>SourceManager::getImmediateInstantiationRange</code> became
266 <code>SourceManager::getImmediateExpansionRange</code></li>
267 <li><code>SourceManager::getDecomposedInstantiationLoc</code> became
268 <code>SourceManager::getDecomposedExpansionLoc</code></li>
269 <li><code>SourceManager::getInstantiationColumnNumber</code> became
270 <code>SourceManager::getExpansionColumnNumber</code></li>
271 <li><code>SourceManager::getInstantiationLineNumber</code> became
272 <code>SourceManager::getExpansionLineNumber</code></li>
273 <!-- TODO: Make this more complete! -->
274</ul>
275
Chandler Carruthc4dbffa2011-11-28 18:55:47 +0000[diff] [blame]276<h4 id="diagnosticrename">Diagnostic class names were shuffled</h4>
277<ul>
278 <li><code>Diagnostic</code> became <code>DiagnosticEngine</code></li>
279 <li><code>DiagnosticClient</code> became <code>DiagnosticConsumer</code></li>
280 <li><code>DiagnosticInfo</code> became <code>Diagnostic</code></li>
281</ul>
282Subclasses of <code>DiagnosticConsumer</code> were also then renamed to end with
283<code>Consumer</code>.
284
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]285<!-- ======================================================================= -->
286<h2 id="knownproblems">Significant Known Problems</h2>
287<!-- ======================================================================= -->
288
289<!-- ======================================================================= -->
290<h2 id="additionalinfo">Additional Information</h2>
291<!-- ======================================================================= -->
292
293<p>A wide variety of additional information is available on the
294<a href="http://clang.llvm.org/">Clang web page</a>. The web page contains
295versions of the API documentation which are up-to-date with the Subversion
296version of the source code. You can access versions of these documents specific
297to this release by going into the "<tt>clang/doc/</tt>" directory in the Clang
298tree.</p>
299
300<p>If you have any questions or comments about Clang, please feel free to
301contact us via the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">
302mailing list</a>.</p>
303
Chandler Carruth59abf062011-11-28 22:12:44 +0000[diff] [blame]304
305<!-- ======================================================================= -->
306<!-- Likely 3.1 release notes -->
307<!-- ======================================================================= -->
308<!--
309This is just a section to hold things that have already gotten started and
310should likely pick up proper release notes in 3.1.
311
312- C1X and C++11 atomics infrastructure and support
313- CUDA support?
314
315-->
316
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]317</body>
318</html>