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<!--*************************************************************************-->
<h1>C++ and C++'0x Support in Clang</h1>
<!--*************************************************************************-->
<p>Last updated: $Date$</p>
<ul>
<li><a href="#projects">Projects Building with Clang</a></li>
<li><a href="#specification">Implementation Status by Section</a></li>
<li><a href="#cxx0x">C++0x Status</a></li>
</ul>
<p>Clang currently implements all of the ISO C++ 1998 standard (including
the defects addressed in the ISO C++ 2003 standard) except for 'export'
(which has been removed from the C++'0x draft).
The <a href="http://llvm.org/bugs/">LLVM bug tracker</a>
contains a Clang C++ component that tracks known Clang C++ bugs.</p>
<h2 id="projects">Projects Building with Clang</h2>
<p>Clang is now capable of compiling large C++ projects, and the following
table describes various projects that we have attempted to compile with
Clang++.</p>
<table width="689" border="1" cellspacing="0">
<tr>
<th>Project</th>
<th>Status</th>
<th>Last Tested</th>
<th>Tracking Bug</th>
</tr>
<tr>
<td><a href="http://clang.llvm.org">Clang</a> and <a href="http://llvm.org">LLVM</a></td>
<td>Successful self-hosting achieved</td>
<td>Continually</td>
<td></td>
</tr>
<tr>
<td><a href="http://www.cmake.org">CMake</a></td>
<td>Compiles, passes regression tests (debug build)</td>
<td>February 9, 2010</td>
<td></td>
</tr>
<tr>
<td><a href="http://www.boost.org">Boost</a></td>
<td><a href="http://blog.llvm.org/2010/05/clang-builds-boost.html">Compiles
and passes regression tests</a> on Darwin/X86-64.</td>
<td>May 20, 2010</td>
<td><a href="http://llvm.org/bugs/show_bug.cgi?id=6023"><del>PR6023</del></a></td>
</tr>
<tr>
<td><a href="http://qt.nokia.com">Qt</a></td>
<td>Partially compiles; miscompilation of uic prevents complete compilation, qmake works, some small examples also.</td>
<td>February 9, 2010</td>
<td><a href="http://llvm.org/bugs/show_bug.cgi?id=5881">PR5881</a></td>
</tr>
</table>
<h2 id="cxx0x">C++0x Implementation status</h2>
<p>Clang's development effort is focused primarily on fixing bugs in the current
ISO C++ standard (1998/2003). This section tracks the status of various C++0x
features.</p>
<h2 id="specification">Implementation Status by Feature</h2>
<!-- Within this table: The colors we're using to color-code our level
of support for a given section:
White (no background): not considered/tested.
#C11B17: Broken.
#F88017: Some useful examples work
#FDD017: Many examples work
#347C17: Nearly everything works
#00FF00 + check mark: Implementation complete!
-->
<p>The following table is used to help track our implementation
progress toward implementing the complete C++'0x standard. We use a
simple, somewhat arbitrary color-coding scheme to describe the
relative completeness of features:</p>
<table width="689" border="1" cellspacing="0">
<tr>
<th>Not started/not evaluated</th>
<th>Not Applicable</th>
<th>Broken</th>
<th>Some examples work</th>
<th>Many examples work</th>
<th>Nearly everything works</th>
<th>Complete</th>
<!--
<th>Complete (with tests for each paragraph)</th>
-->
</tr>
<tr>
<td></td>
<td class="na">N/A</td>
<td class="broken"></td>
<td class="basic"></td>
<td class="medium"></td>
<td class="advanced"></td>
<td class="complete">rXXXXXX</td>
<!--
<td class="complete" align="center">&#x2713;</td>
-->
</tr>
</table>
<p>In addition, boxes marked with &#x2713 have complete and passing tests.
Similarly, boxes marked with &#x2717 have complete tests, some of which
are failing, and a <b>?</b> indicates partial tests while not making any
statement about passing status.</p>
<p>A feature is "complete" when the appropriate Clang component (Parse, AST,
Sema, CodeGen) implements the behavior described in all of the
paragraphs in the relevant C++'0x draft standard. The major
components are:</p>
<dl>
<dt>Parse</dt>
<dd>Clang is able to parse the grammar of this feature (or the grammar
described by this section), but does not necessarily do anything with the
parsed result. Use Clang's <code>-fsyntax-only</code> option to parse C++
programs.</dd>
<dt>AST</dt>
<dd>Clang builds an abstract syntax tree (AST) for the feature, but does not
necessarily perform any type-checking. Use Clang's <code>-ast-print</code>
option to print the resulting ASTs.</dd>
<dt>Sema</dt>
<dd>Clang parses and type-checks this feature and provides a well-formed AST
annotated with types. Use Clang's <code>-fsyntax-only</code> to type-check
code.</dd>
<dt>CodeGen</dt>
<dd>Clang parses, type-checks, and generates code for this feature, allowing
one to compile and execute programs.</dd>
</dl>
<p>Updates to this table are welcome! Tests for the various features are also
welcome!</p>
<table width="689" border="1" cellspacing="0">
<tr><td colspan="7" align="center" bgcolor="#ffddaa">C++0x Features (current draft report <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3225.pdf">here</a>) </td>
</tr>
<tr>
<th>Feature</th>
<th>Parse</th>
<th>AST</th>
<th>Sema</th>
<th>CodeGen</th>
<th>Standard Sections</th>
<th>Notes</th>
</tr>
<tr><td colspan="7" class="category">Control Flow Modifications</td></tr>
<tr>
<td>Range-based for loop</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>6.5.4</td>
<td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2007/n2243.html">N2243</a></td>
</tr>
<tr><td colspan="7" class="category">Type System Modifications</td></tr>
<tr>
<td>rvalue references</td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="broken" align="center"></td>
<td class="broken"></td>
<td>8.3.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html">N2118</a>,
<a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2831.html">N2831</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2027.html">N2027</a>
</td>
</tr>
<tr>
<td>decltype</td>
<td class="complete" align="center">&#x2713;</td>
<td class="complete" align="center">&#x2713;</td>
<td class="advanced" align="center"></td>
<td class="na">N/A</td>
<td>7.1.6.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1478.pdf">N1478</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1978.pdf">N1978</a>
</td>
</tr>
<tr>
<td>auto type deduction</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>7.1.6.2, 7.1.6.4</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf">N1984</a></td>
</tr>
<tr>
<td>nullptr</td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="medium" align="center"></td>
<td class="broken"></td>
<td>2.14.7, 4.10, 4.11</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1488.pdf">N1488</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2214.pdf">N2214</a>
</td>
</tr>
<tr>
<td>enum classes</td>
<td class="complete"></td>
<td class="advanced"></td>
<td class="advanced"></td>
<td></td>
<td>7.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1513.pdf">N1513</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf">N2347</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2499.pdf">N2499</a>
Includes forward declaration capability
</td>
</tr>
<tr>
<td>long long</td>
<td class="complete"></td>
<td class="complete"></td>
<td class="complete"></td>
<td class="complete"></td>
<td>3.9.1</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1811.pdf">N1811</a>
</td>
</tr>
<tr>
<td>constexpr</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>3.6.2, 3.9, 5.19, 7.1.5</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1521.pdf">N1521</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">N2235</a>
</td>
</tr>
<tr>
<td>char16_t/char32_t</td>
<td class="medium"></td>
<td class="medium"></td>
<td class="medium"></td>
<td class="medium"></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2249.html">N2249</a></td>
</tr>
<tr>
<td>Unicode string literal types</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>2.14.3, 2.14.5</td>
<td></td>
</tr>
<tr>
<td>Raw string literal types</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>2.14.5</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2053.html">N2053</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.html">N2442</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2378.pdf">N2378</a>
</td>
</tr>
<tr>
<td>user-defined literal types</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>2.14.8</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2378.pdf">N2378</a></td>
</tr>
<tr>
<td>POD defintion changes</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>3.9, 9</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2294.html">N2294</a></td>
</tr>
<tr>
<td>Unrestricted unions</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>9.5</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2544.pdf">N2544</a></td>
</tr>
<tr>
<td>Tighter narrowing rules</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>8.5.4</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1890.pdf">N1890</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2215.pdf">N2215</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2640.pdf">N2640</a>
</td>
</tr>
<tr><td colspan="7" class="category">Class Modifications</td></tr>
<tr>
<td>delegating constructors</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>12.6.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986">N1986</a></td>
</tr>
<tr>
<td>inheriting constructors</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>12.9</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1890.pdf">N1890</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1898.pdf">N1898</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2512.html">N2512</a>
</td>
</tr>
<tr>
<td>In-declaration member initialization</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2628.html">N2628</a></td>
</tr>
<tr>
<td>Changes to implicitly generated methods</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>Includes implicit generation of move operations</td>
</tr>
<tr>
<td>defaulted methods</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1717.pdf">N1717</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2326.html">N2326</a>
</td>
</tr>
<tr>
<td>destructor defaults to noexcept</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>sizeof on members without object instance</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2150.html">N2150</a></td>
</tr>
<tr>
<td>virtual function safety modifications</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>Explicit conversion operators</td>
<td class="complete" align="center"></td>
<td class="basic" align="center"></td>
<td class="basic" align="center"></td>
<td class="broken"></td>
<td>12.3</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2333.html">N2333</a>
No name mangling; ASTs don't contain calls to conversion operators</td>
</tr>
<tr><td colspan="7" class="category">Template Modifications</td></tr>
<tr>
<td>Right angle brackets</td>
<td class="complete" align="center"></td>
<td class="na" align="center">N/A</td>
<td class="na" align="center">N/A</td>
<td class="na">N/A</td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a></td>
</tr>
<tr>
<td>variadic templates</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>14.6.3</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2151.pdf">N2151</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2080.pdf">N2080</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2087.pdf">N2087</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2772.pdf">N2772</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2551.pdf">N2551</a>
</td>
</tr>
<tr>
<td>template aliases</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>7.1.3, 14.6.7</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1489.pdf">N1489</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf">N2258</a>
Includes non-template type aliasing
</td>
</tr>
<tr>
<td>Removal of export</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td></td>
<td>This was never implemented in C++03</td>
</tr>
<tr>
<td>extern templates</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>14.8.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1448.pdf">N1448</a></td>
</tr>
<tr>
<td>Local classes as template parameters</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2402.pdf">N2402</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">N2657</a>
</td>
</tr>
<tr><td colspan="7" class="category">Exception Modifications</td></tr>
<tr>
<td>Deprecation of exception specifications</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>15.4</td>
<td></td>
</tr>
<tr>
<td>noexcept</td>
<td class="complete" align="center">&#x2713;</td>
<td class="complete" align="center">&#x2713;</td>
<td class="complete" align="center">&#x2713;</td>
<td class="na">N/A</td>
<td>5.3.7, 15.4</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</a></td>
</tr>
<tr><td colspan="7" class="category">Preprocessor Modifications</td></tr>
<tr>
<td>__STDC_HOSTED__</td>
<td></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>16.8</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1568.htm">N1568</a>
</td>
</tr>
<tr>
<td>_Pragma</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>16.9</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1568.htm">N1568</a>
</td>
</tr>
<tr>
<td>Variable argument macros</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>16.3</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1568.htm">N1568</a>
</td>
</tr>
<tr>
<td>Empty macro arguments</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>16.3</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1568.htm">N1568</a>
</td>
</tr>
<tr>
<td>__func__</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>8.4.1</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1568.htm">N1568</a>
</td>
</tr>
<tr>
<td>__cplusplus</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>16.8</td>
<td></td>
</tr>
<tr><td colspan="7" class="category">Things Completely New</td></tr>
<tr>
<td>Late-specified return type</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>8.3.5</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2445.html">N2445</a></td>
</tr>
<tr>
<td>lambda expressions</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>5.1.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1968.htm">N1968</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2550.pdf">N2550</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2859.pdf">N2859</a>
</td>
</tr>
<tr>
<td>Uniform initializers </td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>12.6</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2215.pdf">N2215</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2640.pdf">N2640</a>
</td>
</tr>
<tr>
<td>Memory model</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>1.7</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2556.html">N2556</a></td>
</tr>
<tr><td colspan="7" class="category">Miscellania</td></tr>
<tr>
<td>Standard attribute syntax</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2418.pdf">N2418</a></td>
</tr>
<tr>
<td>alignment control</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>Deleted functions</td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="medium" align="center"></td>
<td class="na">N/A</td>
<td>8.4.3</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2326.htm">N2326</a></br>
This also includes class methods.</td>
</tr>
<tr>
<td>static_assert</td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="advanced" align="center"></td>
<td class="na">N/A</td>
<td>7</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1381.htm">N1381</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.pdf">N1720</a>
</td>
</tr>
<tr>
<td>Inline namespaces</td>
<td class="complete" align="center">&#x2713;</td>
<td class="complete" align="center">&#x2713;</td>
<td class="complete" align="center">&#x2713;</td>
<td class="complete" align="center">N/A</td>
<td>7.3.1</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a></td>
</tr>
<tr>
<td>thread_local storage</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>3.7.2, 7.1.1</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">N2660</a></td>
</tr>
<tr><td colspan="7" class="category">Standard Library Modifications, see <a href="http://libcxx.llvm.org/index.html">libc++</a> or <a href="http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt01ch01.html#manual.intro.status.standard.200x">libstdc++</a> or <a href="http://blogs.msdn.com/b/vcblog/archive/2010/07/02/video-introduction-to-the-stl-part-1.aspx">VC++ 2010</a></td></tr>
</table>
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