2011-11-28 15:16:19 +08:00
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<title>Clang 3.0 Release Notes</title>
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<div id="content">
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<h1>Clang 3.0 Release Notes</h1>
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<img align=right src="http://llvm.org/img/DragonSmall.png"
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width="136" height="136" alt="LLVM Dragon Logo">
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<ul>
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<li><a href="#intro">Introduction</a></li>
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<li><a href="#whatsnew">What's New in Clang 3.0?</a>
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<ul>
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<li><a href="#majorfeatures">Major New Features</a></li>
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<li><a href="#cchanges">C Language Changes</a></li>
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<li><a href="#cxxhanges">C++ Language Changes</a></li>
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<li><a href="#objchanges">Objective-C Language Changes</a></li>
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<li><a href="#apichanges">Internal API Changes</a></li>
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</ul>
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2011-11-28 15:16:19 +08:00
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</li>
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<li><a href="#knownproblems">Known Problems</a></li>
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<li><a href="#additionalinfo">Additional Information</a></li>
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</ul>
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<div class="doc_author">
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<p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
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</div>
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<!--
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<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
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release.<br>
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You may prefer the
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<a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
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Release Notes</a>.</h1>
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-->
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<!-- ======================================================================= -->
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<h2 id="intro">Introduction</h2>
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<!-- ======================================================================= -->
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<p>This document contains the release notes for the Clang C/C++/Objective-C
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frontend, part of the LLVM Compiler Infrastructure, release 3.0. Here we
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describe the status of Clang in some detail, including major improvements from
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the previous release and new feature work. For the general LLVM release notes,
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see <a href ="http;//llvm.org/docs/ReleaseNotes.html">the LLVM
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documentation</a>. All LLVM releases may be downloaded from the
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<a href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
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<p>For more information about Clang or LLVM, including information about the
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latest release, please check out the main please see the
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<a href="http://clang.llvm.org">Clang Web Site</a> or the
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<a href="http://llvm.org">LLVM Web Site</a>.
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<p>Note that if you are reading this file from a Subversion checkout or the main
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Clang web page, this document applies to the <i>next</i> release, not the
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current one. To see the release notes for a specific release, please see the
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<a href="http://llvm.org/releases/">releases page</a>.</p>
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<!-- ======================================================================= -->
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<h2 id="whatsnew">What's New in Clang 3.0?</h2>
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<!-- ======================================================================= -->
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<p>Some of the major new features and improvements to Clang are listed here.
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Generic improvements to Clang as a whole or two its underlying infrastructure
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are described first, followed by language-specific sections with improvements to
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Clang's support for those languages.</p>
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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<h3 id="majorfeatures">Major New Features</h3>
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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2011-11-28 16:41:06 +08:00
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<h4 id="notes">Unorganized Notes</h4>
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<p>These are completely random notes as I'm organizing my thoughts and reviewing
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the history. Anything still here needs to be distilled and turned into proper
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prose in a section of its own. When doing that, delete the notes.</p>
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<ul>
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<li>OS Availability attribute -- r128127</li>
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<li>GNU ObjectiveC Runtime support -- David Chisnall</li>
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2011-11-28 17:43:30 +08:00
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<li>Improved AST support for partially constructed nodes and incomplete
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information for LLDB and other clients which dynamically build AST nodes.</li>
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<li>Memory reduction -- initializers, macro expansions, source locations,
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etc.</li>
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2011-11-28 19:27:33 +08:00
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<li>ObjC ARC -- get a blurb from rjmccall</li>
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<li>ObjC related result type/instancetype</li>
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2011-11-28 20:24:23 +08:00
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<li>Thread Safety attributes and correctness analysis added to Clang.</li>
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And that completes my sweep through commits for things that might be
worth noting in the release notes. These remain raw notes. I'll be
re-writing them into nice prose first thing tomorrow, with help from
others. A couple of notes for any reading the commits:
If you don't see something that should be mentioned, feel free to add
a note (or even a nicely written section) about it! I haven't really
done the static analyzer justice here as I don't really know what the
significant changes are other than mile-high stuff like watching it grow
C++ support and a more robust CFG. I also worry I've missed important
stuff in the Objective-C world.
If you see something that isn't worth mentioning, just delete it. I know
there are several things like this. I plan to prune the list down as
I flesh things out.
If you're name or email is on a bullet, I'll likely be sending you an
email asking for any input on that subject. For many of these I can fill
in something generic, and I'll just want you to give it a once-over.
However, if you have time, feel free to just write the blurb yourself
and drop it in, or drop it in an email to me.
Finally, *WOW* has a lot happened in Clang... I shouldn't have dreaded
(and put off) this so much, it was kind of awesome to go back and watch
the evolution. Anyways, these should be in a reasonable draft state
early tomorrow.
llvm-svn: 145247
2011-11-28 21:02:29 +08:00
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<li>Major improvements to the interactions between serializing and
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deserializing the AST and the preprocessor -- argiris</li>
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2011-11-28 16:41:06 +08:00
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</ul>
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2011-11-29 06:34:59 +08:00
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<h4 id="diagnostics">A multitude of improvements to Clang's diagnostics</h4>
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Clang's diagnostics are constantly being improved to catch more issues, explain
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them more clearly, and provide more accurate source information about them.
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A few improvements since the 2.9 release that have a particularly high impact:
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<ul>
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<li>Substantially shorter messages due to better recovery, fewer include
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stacks, and tuning verbose features such as 'a.k.a.' type printing.</li>
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<li>
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Able to recover and correct from misspelled type names at the begging of statements. For example, Clang now emits:
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<pre><b>t.c:6:3: <span class="error">error:</span> use of undeclared identifier 'integer'; did you mean 'Integer'?</b>
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integer *i = 0;
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<span class="caret">^~~~~~~</span>
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Integer
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<b>t.c:1:13: note:</b> 'Integer' declared here
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typedef int Integer;
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<span class="caret">^</span></pre>
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</li>
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<li>Expanded typo correction to (among other improvements) look across
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namespaces and suggest namespace qualifiers in addition to misspellings of the
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identifier itself.</li>
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<li>More rich macro expansion backtraces and some (limited) fix-it hints when
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diagnostics stem from macro arguments.</li>
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2011-11-29 06:54:33 +08:00
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<li>Many new warnings have been added to catch common, bug-prone code
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patterns.</li>
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<li>Uninitialized values Clang warning was rewritten to be more accurate,
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faster, and able to differentiate between the <em>possibility</em> of an
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uninitialized use and the <em>certainty</em> of an uninitialized use.</li>
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2011-11-29 06:34:59 +08:00
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</ul>
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2011-11-29 06:43:32 +08:00
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<h4 id="libclang">This release saw significant improvements to <code>libclang</code></h4>
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<ul>
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<li>A broader set of the <code>libclang</code> API is exposed in the Python
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bindings.</li>
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<li>Much more of the Clang AST is exposed through <code>libclang</code>'s APIs
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and cursors.</li>
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<li>Cursors can now walk more effectively through macros, especially arguments
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to function-style macros, and resolve to the underlying AST.</li>
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<li>Improved code completion surrounding macros, macro arguments, and
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token pasting.</li>
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<li>Improved code completion for in-class member functions.</li>
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<li>Crash recovery for <code>libclang</code> clients.</li>
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<!-- Doug or Ted may want to flesh this out if there are relevant details I'm
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glossing over... -->
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</ul>
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2011-11-29 05:56:30 +08:00
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<h4 id="driver">The Clang GCC-compatible command-line driver improved dramatically</h4>
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A great deal of work went into the GCC-compatible driver for the 3.0 release
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making it support more operating systems, emulate GCC behavior more accurately,
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and support a much broader range of Linux distributions out of the box.
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<ul>
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<li>More accurate support for hardware architecture pre-defined macros (e.g.,
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__i686__).</li>
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<li>Robust library and header search paths for the vast majority of x86 and
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x86-64 Linux distributions.</li>
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<li>Improved support for newer Darwin platforms.</li>
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<li>Partial support for <code>--sysroot=...</code> based cross-compiling on
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Linux (and similar) host systems.</li>
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<li>Improved support for locating and using libcxx when installed, especially
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on Darwin.</li>
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<!-- There are likely more Darwin-specific improvements to mention here? -->
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<!-- What support was added for FreeBSD? NetBSD? Anything noteworthy? -->
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2011-11-29 06:54:33 +08:00
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<li>Automatic detection of Clang crashes in the driver and preparation of
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reproduction steps for filing bug reports.</li><!-- Chad, feel free to add
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more details here. -->
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2011-11-29 05:56:30 +08:00
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</ul>
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2011-11-29 03:17:25 +08:00
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<h4 id="ppcallbacks">Expanded support for instrumenting the preprocessor through
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callbacks</h4>
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2011-11-29 05:47:51 +08:00
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Several enhancements were made to the <code>PPCallbacks</code> interface to
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expand the information available to tools and library users of Clang that wish
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to introspect the preprocessing.
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2011-11-29 03:17:25 +08:00
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<ul>
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<li>The exact text used between the <code>""</code>s or <code><></code>s is reported.</li>
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<li>The header search path used to locate the header is reported.</li>
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<li>Missing files during including headers reported.</li>
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<li>The exact source range for expanded macros can be retrieved.</li>
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</ul>
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2011-11-29 07:11:27 +08:00
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<h4 id="windows">Clang is building and tested regularly on Windows and can
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compile limited subsets of code on Windows</h4>
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Clang is regularly built and tested on a variety of Windows platforms including
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MinGW 32-bit and 64-bit, Cygwin, and natively with MSVC. In addition, Clang can
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be used as a compiler in a few Windows contexts.
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<ul>
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<li>Normal compilation supported for the MinGW target platform, in both 32-bit
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and 64-bit, and the Cygwin target platform.</li>
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<li>Parsing and AST support for Windows Structured Exception Handling.</li>
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<li>Initial support for some MSVC language extensions and the ability to parse
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a few native MSVC system headers.</li>
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</ul>
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2011-11-29 07:02:13 +08:00
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<!--
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Nick and/or Rafael will flesh this out into a bit about the CFI / DWARF
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improvements.
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<h4 id="dwarf">DWARF Exception Handling uses CFI...</h4>
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Rafael had a zillion patches to emit stuff using .cfi directives... =]
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-->
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2011-11-29 06:17:58 +08:00
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<!--
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Need Peter and/or Tanya to flesh this out if we want it in 3.0's notes.. The
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state isn't clear just from documentation or commit logs.
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<h4 id="opencl">Initial work to support compiling OpenCL with Clang</h4>
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Clang has some (limited) support for compiling OpenCL.
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-->
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2011-11-28 15:16:19 +08:00
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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<h3 id="cchanges">C Language Changes in Clang</h3>
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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2011-11-29 06:48:25 +08:00
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<h4 id="c1xchanges">C1X Feature Support</h4>
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<p>Clang 3.0 adds support for the
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<a href="http://clang.llvm.org/docs/LanguageExtensions.html#c1x">
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<code>_Alignas</code>, <code>_Generic</code>, and <code>_Static_assert</code>
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keywords</a>, drafted for inclusion in the next C standard, which is
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provisionally known as C1X. Use <code>-std=c1x</code> or <code>-std=gnu1x</code>
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to enable support for the new language standard. These features are
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backwards-compatible and are available as an extension in all language
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modes.</p>
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2011-11-28 15:16:19 +08:00
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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<h3 id="cxxchanges">C++ Language Changes in Clang</h3>
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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2011-11-29 04:02:05 +08:00
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<h4 id="cxx11changes">C++11 Feature Support</h4>
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<p>Clang 3.0 adds support for
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<a href="http://clang.llvm.org/cxx_status.html#cxx11">more of the language
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features</a> added in the latest ISO C++ standard, C++11. Use
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<code>-std=c++11</code> or <code>-std=gnu++11</code> to enable support for these
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features. The following are now considered to be of production quality:
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<ul>
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<li>Range-based <code>for</code> loops</li>
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<li>Alias declarations (a new syntax for <code>typedef</code> declarations),
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including their <code>template</code> forms</li>
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<li>Specifying default values for class data members within a class
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definition</li>
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<li>Constructors delegating to other constructors of the same class</li>
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<li>The <code>override</code> context-sensitive keyword for virtual member
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function declarations</li>
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<li>Explicitly generating default function definitions with
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<code>= default</code></li>
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<li>The <code>nullptr</code> keyword, and the corresponding type</li>
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<li>Raw string literals with arbitary delimiters (for instance,
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<code>R"delim(str"ing)delim"</code>)</li>
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<li>Unicode string literals (for instance, <code>U"\u1234"</code>) and the
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<code>char16_t</code> and <code>char32_t</code> built-in types
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<li><code>noexcept</code> expressions and the <code>noexcept</code> specifier
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on function declarations</li>
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<li><code>alignof</code> expressions and the <code>alignas</code> specifier on
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2011-11-29 04:02:05 +08:00
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variable declarations</li>
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<li>A full set of <a href="http://clang.llvm.org/docs/LanguageExtensions.html#checking_type_traits">type traits</a>,
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sufficient to support C++11 standard libraries</li>
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</ul>
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2011-11-29 05:55:34 +08:00
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All warning and language selection flags which previously accepted
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<code>c++0x</code> now accept <code>c++11</code>. The old <code>c++0x</code>
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form remains as an alias.
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2011-11-29 04:02:05 +08:00
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2011-11-28 15:16:19 +08:00
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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<h3 id="objcchanges">Objective-C Language Changes in Clang</h3>
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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<h3 id="apichanges">Internal API Changes</h3>
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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2011-11-29 02:55:47 +08:00
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These are major API changes that have happened since the 2.9 release of Clang.
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If upgrading an external codebase that uses Clang as a library, this section
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should help get you past the largest hurdles of upgrading.
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2011-11-29 03:06:34 +08:00
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<h4 id="macroexpansion">Switched terminology from "instantiation" to "expansion"
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for macros</h4>
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A great deal of comments and code changes fell out of this, but also every API
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relating to macros with the word "instantiation" (or some variant thereof) was
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renamed. An incomplete list of the most note-worthy ones is here:
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<ul>
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<li><code>MacroInstantiation</code> became <code>MacroExpansion</code></li>
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<li><code>SourceManager::getInstantiationLoc</code> became
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<code>SourceManager::getExpansionLoc</code></li>
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<li><code>SourceManager::getInstantiationRange</code> became
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<code>SourceManager::getExpansionRange</code></li>
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<li><code>SourceManager::getImmediateInstantiationRange</code> became
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<code>SourceManager::getImmediateExpansionRange</code></li>
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<li><code>SourceManager::getDecomposedInstantiationLoc</code> became
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<code>SourceManager::getDecomposedExpansionLoc</code></li>
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<li><code>SourceManager::getInstantiationColumnNumber</code> became
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<code>SourceManager::getExpansionColumnNumber</code></li>
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<li><code>SourceManager::getInstantiationLineNumber</code> became
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<code>SourceManager::getExpansionLineNumber</code></li>
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<!-- TODO: Make this more complete! -->
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</ul>
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2011-11-29 02:55:47 +08:00
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<h4 id="diagnosticrename">Diagnostic class names were shuffled</h4>
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<ul>
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<li><code>Diagnostic</code> became <code>DiagnosticEngine</code></li>
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<li><code>DiagnosticClient</code> became <code>DiagnosticConsumer</code></li>
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<li><code>DiagnosticInfo</code> became <code>Diagnostic</code></li>
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</ul>
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Subclasses of <code>DiagnosticConsumer</code> were also then renamed to end with
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<code>Consumer</code>.
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2011-11-28 15:16:19 +08:00
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<!-- ======================================================================= -->
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<h2 id="knownproblems">Significant Known Problems</h2>
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<!-- ======================================================================= -->
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<!-- ======================================================================= -->
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<h2 id="additionalinfo">Additional Information</h2>
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<!-- ======================================================================= -->
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<p>A wide variety of additional information is available on the
|
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|
<a href="http://clang.llvm.org/">Clang web page</a>. The web page contains
|
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|
|
|
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
|
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|
|
|
to this release by going into the "<tt>clang/doc/</tt>" directory in the Clang
|
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|
|
|
tree.</p>
|
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|
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|
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|
<p>If you have any questions or comments about Clang, please feel free to
|
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|
|
|
contact us via the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">
|
|
|
|
|
mailing list</a>.</p>
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2011-11-29 06:12:44 +08:00
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<!-- ======================================================================= -->
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<!-- Likely 3.1 release notes -->
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<!-- ======================================================================= -->
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<!--
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This is just a section to hold things that have already gotten started and
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should likely pick up proper release notes in 3.1.
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- C1X and C++11 atomics infrastructure and support
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|
- CUDA support?
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-->
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|
2011-11-28 15:16:19 +08:00
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</body>
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</html>
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