234 lines
9.5 KiB
HTML
234 lines
9.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>Clang 3.1 Release Notes</title>
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<link type="text/css" rel="stylesheet" href="../menu.css">
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<link type="text/css" rel="stylesheet" href="../content.css">
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<style type="text/css">
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td {
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vertical-align: top;
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}
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</style>
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</head>
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<body>
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<!--#include virtual="../menu.html.incl"-->
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<div id="content">
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<h1>Clang 3.1 Release Notes</h1>
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<img style="float: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 3.1?</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="#cxxchanges">C++ Language Changes</a></li>
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<li><a href="#objcchanges">Objective-C Language Changes</a></li>
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<li><a href="#apichanges">Internal API Changes</a></li>
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<li><a href="#pythonchanges">Python Binding Changes</a></li>
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</ul>
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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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<h1 style="color:red">These are in-progress notes for the upcoming Clang 3.1
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release.<br>
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You may prefer the
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<a href="http://llvm.org/releases/3.0/docs/ClangReleaseNotes.html">Clang 3.0
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Release Notes</a>.</h1>
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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 3.1. 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 3.1?</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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<h4 id="majorfeature1">Feature 1</h4>
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...
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<h4 id="diagnostics">New and better diagnostics</h4>
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<p>New: <code>-Wdangling-else</code>, <code>-Wstrncat-size</code>, ...</p>
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<p>Improved: <code>-Wformat</code>, <code>-Wempty-body</code>,
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<code>-Wliteral-conversion</code>, ...</p>
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<h4 id="tooling">Tooling</h4>
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<!-- FIXME: add a link to the tooling documentation once that's written. -->
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<p>Added an API to enable clang-based standalone tools, including initial build
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system integration.</p>
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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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<h4 id="c11changes">C11 Feature Support</h4>
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<p>Clang 3.1 adds support for anonymous structs and anonymous unions, added in
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the latest ISO C standard. Use <code>-std=c11</code> or <code>-std=gnu11</code>
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to enable support for the new language standard. The new C11 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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<p>All warning and language selection flags which previously accepted
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<code>c1x</code> have been updated to accept <code>c11</code>. The old
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<code>c1x</code> forms have been removed.</p>
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<p>Clang 3.1 adds a family of <code>__c11_atomic</code> builtins corresponding
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directly to the <code>_explict</code> versions of the C11 atomic functions.
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This means that C11's <code><stdatomic.h></code> can be implemented in
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a small set of trivial macros. </p>
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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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<h4 id="cxx11changes">C++11 Feature Support</h4>
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<p>Clang 3.1 supports
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<a href="http://clang.llvm.org/cxx_status.html#cxx11">most of the language
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features</a> added in the latest ISO C++ standard,
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<a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372">C++ 2011</a>.
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Use <code>-std=c++11</code> or <code>-std=gnu++11</code> to enable support for
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these features. In addition to the features supported by Clang 3.0, the
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following are now considered to be of production quality:
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<ul>
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<li>Generalized constant expressions</li>
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<li>Lambda expressions</li>
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<li>Generalized initializers</li>
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<li>Unrestricted unions</li>
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<li>User-defined literals</li>
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<li>Forward-declared enumerations</li>
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<li>Atomics (both libc++'s and libstdc++4.7's <tt><atomic></tt> are
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supported)</li>
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</ul>
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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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Clang 3.1 introduces several new Objective-C language features and improvements.
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<h4 id="objcwformat">Format string checking for NSString literals</h4>
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<code>-Wformat</code> now checks <code>@"nsstring literals"</code>.
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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<h3 id="apichanges">Internal API Changes</h3>
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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These are major API changes that have happened since the 3.0 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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<h4 id="api1">API change 1</h4>
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...
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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<h3 id="pythonchanges">Python Binding Changes</h3>
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<!-- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = -->
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The following methods have been added:
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<ul>
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<li>SourceLocation.from_position (static)</li>
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<li>SourceLocation.__eq__ and SourceLocation.__ne__</li>
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<li>SourceRange.__eq__ and SourceRange.__ne__</li>
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<li>Diagnostic.category_number (property)</li>
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<li>Diagnostic.category_name (property)</li>
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<li>Diagnostic.option (property)</li>
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<li>Diagnostic.disable_option (property)</li>
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<li>CursorKind.is_translation_unit</li>
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<li>CursorKind.is_preprocessing</li>
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<li>CursorKind.is_unexposed</li>
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<li>Cursor.from_location (static)</li>
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<li>Cursor.underlying_typedef_type (property)</li>
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<li>Cursor.enum_type (property)</li>
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<li>Cursor.objc_type_encoding (property)</li>
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<li>Cursor.hash</li>
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<li>TypeKind.spelling</li>
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<li>Type.argument_types</li>
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<li>Type.element_type (property)</li>
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<li>Type.element_count (property)</li>
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<li>Type.is_function_variadic</li>
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<li>Type.is_pod</li>
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<li>Type.get_array_element_type</li>
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<li>Type.get_array_size</li>
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<li>Type.__eq__ and Type.__ne__</li>
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<li>File.from_name (static)</li>
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<li>File.__str__ and File.__repr__</li>
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</ul>
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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
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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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<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">
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mailing list</a>.</p>
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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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</div>
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</body>
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</html>
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