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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).
   However, the implementation of Clang C++ is still somewhat immature, with
   remaining bugs that may cause compiler crashes, erroneous errors and warnings,
   or miscompiled code. 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"></td>
     <td class="complete" align="center">&#x2713;</td>
   </tr>
 </table>

 <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="6" align="center" bgcolor="#ffffcc">C++0x Features</td>
 </tr>
   <tr>
     <th>Feature</th>
     <th>Parse</th>
     <th>AST</th>
     <th>Sema</th>
     <th>CodeGen</th>
     <th>Notes</th>
   </tr>

 <tr>
   <td>Explicit conversion operators (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a>)</td>
   <td class="complete" align="center"></td>
   <td class="medium" align="center"></td>
   <td class="advanced" align="center"></td>
   <td class="broken"></td>
   <td>No name mangling; ASTs don't contain calls to conversion operators</td>
 </tr>
 <tr>
   <td>Static assertions (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.pdf">N1720</a>)</td>
   <td class="complete" align="center"></td>
   <td class="complete" align="center"></td>
   <td class="complete" align="center"></td>
   <td class="na">N/A</td>
   <td></td>
 </tr>
 <tr>
   <td>Deleted functions (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a>)</td>
   <td class="complete" align="center"></td>
   <td class="complete" align="center"></td>
   <td class="complete" align="center"></td>
   <td class="na">N/A</td>
   <td></td>
 </tr>
 <tr>
   <td>Rvalue references (<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>)</td>
   <td class="complete" align="center"></td>
   <td class="complete" align="center"></td>
   <td class="complete" align="center"></td>
   <td class="broken"></td>
   <td></td>
 </tr>
 <tr>
   <td>nullptr (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a>)</td>
   <td class="complete" align="center"></td>
   <td class="complete" align="center"></td>
   <td class="complete" align="center"></td>
   <td class="broken"></td>
   <td></td>
 </tr>
 <tr>
   <td>Right angle brackets (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a>)</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>
 </tr>
 <tr>
   <td>Decltype (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a>)</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></td>
 </tr>
 </table>
 <br />
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	<div id="content">

	<!--*************************************************************************-->
	<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).
	However, the implementation of Clang C++ is still somewhat immature, with
	remaining bugs that may cause compiler crashes, erroneous errors and warnings,
	or miscompiled code. 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"></td>
	<td class="complete" align="center">✓</td>
	</tr>
	</table>

	<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="6" align="center" bgcolor="#ffffcc">C++0x Features</td>
	</tr>
	<tr>
	<th>Feature</th>
	<th>Parse</th>
	<th>AST</th>
	<th>Sema</th>
	<th>CodeGen</th>
	<th>Notes</th>
	</tr>

	<tr>
	<td>Explicit conversion operators (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a>)</td>
	<td class="complete" align="center"></td>
	<td class="medium" align="center"></td>
	<td class="advanced" align="center"></td>
	<td class="broken"></td>
	<td>No name mangling; ASTs don't contain calls to conversion operators</td>
	</tr>
	<tr>
	<td>Static assertions (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.pdf">N1720</a>)</td>
	<td class="complete" align="center"></td>
	<td class="complete" align="center"></td>
	<td class="complete" align="center"></td>
	<td class="na">N/A</td>
	<td></td>
	</tr>
	<tr>
	<td>Deleted functions (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a>)</td>
	<td class="complete" align="center"></td>
	<td class="complete" align="center"></td>
	<td class="complete" align="center"></td>
	<td class="na">N/A</td>
	<td></td>
	</tr>
	<tr>
	<td>Rvalue references (<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>)</td>
	<td class="complete" align="center"></td>
	<td class="complete" align="center"></td>
	<td class="complete" align="center"></td>
	<td class="broken"></td>
	<td></td>
	</tr>
	<tr>
	<td>nullptr (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a>)</td>
	<td class="complete" align="center"></td>
	<td class="complete" align="center"></td>
	<td class="complete" align="center"></td>
	<td class="broken"></td>
	<td></td>
	</tr>
	<tr>
	<td>Right angle brackets (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a>)</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>
	</tr>
	<tr>
	<td>Decltype (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a>)</td>
	<td class="complete" align="center">✓</td>
	<td class="complete" align="center">✓</td>
	<td class="complete" align="center">✓</td>
	<td class="na">N/A</td>
	<td></td>
	</tr>
	</table>
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