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Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]5<title>Clang 3.2 Release Notes</title>
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19
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]20<h1>Clang 3.2 Release Notes</h1>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]21
Benjamin Kramer665a8dc2012-01-15 15:26:07 +0000[diff] [blame]22<img style="float:right" src="http://llvm.org/img/DragonSmall.png"
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]23 width="136" height="136" alt="LLVM Dragon Logo">
24
25<ul>
26 <li><a href="#intro">Introduction</a></li>
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]27 <li><a href="#whatsnew">What's New in Clang 3.2?</a>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]28 <ul>
29 <li><a href="#majorfeatures">Major New Features</a></li>
Alexey Samsonovf7a4c352012-06-22 11:18:10 +0000[diff] [blame]30 <li><a href="#newflags">New Compiler Flags</a></li>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]31 <li><a href="#cchanges">C Language Changes</a></li>
Richard Smith45fb9952012-02-16 00:32:27 +0000[diff] [blame]32 <li><a href="#cxxchanges">C++ Language Changes</a></li>
Jean-Daniel Dupas3fd80872012-03-03 13:37:22 +0000[diff] [blame]33 <li><a href="#objcchanges">Objective-C Language Changes</a></li>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]34 <li><a href="#apichanges">Internal API Changes</a></li>
Gregory Szorc63419002012-05-12 20:45:56 +0000[diff] [blame]35 <li><a href="#pythonchanges">Python Binding Changes</a></li>
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]36 </ul>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]37 </li>
38 <li><a href="#knownproblems">Known Problems</a></li>
39 <li><a href="#additionalinfo">Additional Information</a></li>
40</ul>
41
42<div class="doc_author">
43 <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
44</div>
45
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]46<h1 style="color:red">These are in-progress notes for the upcoming Clang 3.2
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]47release.<br>
48You may prefer the
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]49<a href="http://llvm.org/releases/3.1/docs/ClangReleaseNotes.html">Clang 3.1
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]50Release Notes</a>.</h1>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]51
52<!-- ======================================================================= -->
53<h2 id="intro">Introduction</h2>
54<!-- ======================================================================= -->
55
56<p>This document contains the release notes for the Clang C/C++/Objective-C
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]57 frontend, part of the LLVM Compiler Infrastructure, release 3.2. Here we
58 describe the status of Clang in some detail, including major improvements
59 from the previous release and new feature work. For the general LLVM release
60 notes, see <a href="http://llvm.org/docs/ReleaseNotes.html">the LLVM
61 documentation</a>. All LLVM releases may be downloaded from the
62 <a href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]63
64<p>For more information about Clang or LLVM, including information about the
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]65 latest release, please check out the main please see the
66 <a href="http://clang.llvm.org">Clang Web Site</a> or the
67 <a href="http://llvm.org">LLVM Web Site</a>.
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]68
69<p>Note that if you are reading this file from a Subversion checkout or the main
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]70 Clang web page, this document applies to the <i>next</i> release, not the
71 current one. To see the release notes for a specific release, please see the
72 <a href="http://llvm.org/releases/">releases page</a>.</p>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]73
74<!-- ======================================================================= -->
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]75<h2 id="whatsnew">What's New in Clang 3.2?</h2>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]76<!-- ======================================================================= -->
77
78<p>Some of the major new features and improvements to Clang are listed here.
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]79 Generic improvements to Clang as a whole or to its underlying infrastructure
80 are described first, followed by language-specific sections with improvements
81 to Clang's support for those languages.</p>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]82
83<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
84<h3 id="majorfeatures">Major New Features</h3>
85<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
86
Richard Smithb2647022012-05-25 02:35:34 +0000[diff] [blame]87<h4 id="diagnostics">Improvements to Clang's diagnostics</h4>
Chandler Carrutha0df07d2011-11-28 22:17:58 +0000[diff] [blame]88
Richard Smithb2647022012-05-25 02:35:34 +0000[diff] [blame]89<p>Clang's diagnostics are constantly being improved to catch more issues,
90explain them more clearly, and provide more accurate source information about
91them. The improvements since the 3.1 release include:</p>
92
93<ul>
94 <li><tt>-Wuninitialized</tt> has been taught to recognise uninitialized uses
95 which always occur when an explicitly-written non-constant condition is either
96 <tt>true</tt> or <tt>false</tt>. For example:
97
98<pre>
99int f(bool b) {
100 int n;
101 if (b)
102 n = 1;
103 return n;
104}
105
Richard Smithbdb97ff2012-05-26 06:20:46 +0000[diff] [blame]106<b>sometimes-uninit.cpp:3:7: <span class="warning">warning:</span> variable 'n' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]</b>
Richard Smithb2647022012-05-25 02:35:34 +0000[diff] [blame]107 if (b)
108 <span class="caret">^</span>
Richard Smithbdb97ff2012-05-26 06:20:46 +0000[diff] [blame]109<b>sometimes-uninit.cpp:5:10: <span class="note">note:</span></b> uninitialized use occurs here
110 return n;
111 <span class="caret">^</span>
112<b>sometimes-uninit.cpp:3:3: <span class="note">note:</span></b> remove the 'if' if its condition is always true
113 if (b)
114 <span class="caret">^~~~~~</span>
Richard Smithb2647022012-05-25 02:35:34 +0000[diff] [blame]115<b>sometimes-uninit.cpp:2:8: <span class="note">note:</span></b> initialize the variable 'n' to silence this warning
116 int n;
117 <span class="caret">^</span>
118 <span class="caret"> = 0</span>
119</pre>
120
121 This functionality can be enabled or disabled separately from
122 <tt>-Wuninitialized</tt> with the <tt>-Wsometimes-uninitialized</tt> warning
123 flag.</li>
124</ul>
125
Alexey Samsonovf7a4c352012-06-22 11:18:10 +0000[diff] [blame]126<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
127<h3 id="newflags">New Compiler Flags</h3>
128<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
129<ul>
130 <li><tt>-gline-tables-only</tt> controls the
131 <a href="http://clang.llvm.org/docs/UsersManual.html#debuginfosize">size of debug information</a>.
132 This flag tells Clang to emit debug info which is just enough to obtain stack traces with
133 function names, file names and line numbers (by such tools as gdb or addr2line).
134 Debug info for variables or function parameters is not produced, which reduces
135 the size of the resulting binary.
136</ul>
Manuel Klimek92f74092012-04-04 12:53:16 +0000[diff] [blame]137
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]138<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
139<h3 id="cchanges">C Language Changes in Clang</h3>
140<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
141
Richard Smith45fb9952012-02-16 00:32:27 +0000[diff] [blame]142<h4 id="c11changes">C11 Feature Support</h4>
Richard Smith62d730f2011-11-28 22:48:25 +0000[diff] [blame]143
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]144<p>...</p>
Richard Smith45fb9952012-02-16 00:32:27 +0000[diff] [blame]145
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]146<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
147<h3 id="cxxchanges">C++ Language Changes in Clang</h3>
148<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
149
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]150<h4 id="cxx11changes">C++11 Feature Support</h4>
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]151
152<p>...</p>
Richard Smith855746b2011-11-28 20:02:05 +0000[diff] [blame]153
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]154<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
155<h3 id="objcchanges">Objective-C Language Changes in Clang</h3>
156<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
Chandler Carruth4d582122011-11-29 00:15:23 +0000[diff] [blame]157
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]158<p>...</p>
Chandler Carruth52e375e2011-11-29 00:15:25 +0000[diff] [blame]159
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]160<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
161<h3 id="apichanges">Internal API Changes</h3>
162<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
163
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]164<p>These are major API changes that have happened since the 3.1 release of
165 Clang. If upgrading an external codebase that uses Clang as a library, this
166 section should help get you past the largest hurdles of upgrading.</p>
Chandler Carruthc4dbffa2011-11-28 18:55:47 +0000[diff] [blame]167
Richard Smith45fb9952012-02-16 00:32:27 +0000[diff] [blame]168<h4 id="api1">API change 1</h4>
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]169
170<p>...</p>
Chandler Carruthc4dbffa2011-11-28 18:55:47 +0000[diff] [blame]171
Gregory Szorc63419002012-05-12 20:45:56 +0000[diff] [blame]172<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
173<h3 id="pythonchanges">Python Binding Changes</h3>
174<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
175
176The following methods have been added:
177<ul>
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]178 <li>...</li>
Gregory Szorc63419002012-05-12 20:45:56 +0000[diff] [blame]179</ul>
180
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]181<!-- ======================================================================= -->
182<h2 id="knownproblems">Significant Known Problems</h2>
183<!-- ======================================================================= -->
184
185<!-- ======================================================================= -->
186<h2 id="additionalinfo">Additional Information</h2>
187<!-- ======================================================================= -->
188
189<p>A wide variety of additional information is available on the
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]190 <a href="http://clang.llvm.org/">Clang web page</a>. The web page contains
191 versions of the API documentation which are up-to-date with the Subversion
192 version of the source code. You can access versions of these documents
193 specific to this release by going into the "<tt>clang/doc/</tt>" directory in
194 the Clang tree.</p>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]195
196<p>If you have any questions or comments about Clang, please feel free to
Bill Wendlingc0bb3122012-05-24 06:42:56 +0000[diff] [blame]197 contact us via
198 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev"> mailing
199 list</a>.</p>
Chandler Carruth59abf062011-11-28 22:12:44 +0000[diff] [blame]200
201<!-- ======================================================================= -->
202<!-- Likely 3.1 release notes -->
203<!-- ======================================================================= -->
204<!--
205This is just a section to hold things that have already gotten started and
206should likely pick up proper release notes in 3.1.
207
208- C1X and C++11 atomics infrastructure and support
209- CUDA support?
210
211-->
212
Benjamin Kramer665a8dc2012-01-15 15:26:07 +0000[diff] [blame]213</div>
Chandler Carruthc00c0c32011-11-28 07:16:19 +0000[diff] [blame]214</body>
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