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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"></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="basic" align="center"></td> |
| <td class="basic" 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="advanced" 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="medium" 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="broken" 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="medium" 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="advanced" align="center"></td> |
| <td class="na">N/A</td> |
| <td></td> |
| </tr> |
| <tr> |
| <td>noexcept (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</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>Inline namespaces (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a>)</td> |
| <td class="complete" align="center">✓</td> |
| <td class="complete" align="center">✓</td> |
| <td class="complete" align="center">✓</td> |
| <td class="complete" align="center">N/A</td> |
| <td></td> |
| </tr> |
| </table> |
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