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| <!--*************************************************************************--> |
| <h1>C++98, C++11, and C++14 Support in Clang</h1> |
| <!--*************************************************************************--> |
| <p>Last updated: $Date$</p> |
| |
| <h2 id="cxx98">C++98 implementation status</h2> |
| |
| <p>Clang currently implements all of the ISO C++ 1998 standard |
| (including the defects addressed in the ISO C++ 2003 standard) |
| except for <tt>export</tt> (which has been removed in C++11) |
| and is considered a production-quality C++ compiler. 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="cxx11">C++11 implementation status</h2> |
| |
| <p>Clang implements all of the <a |
| href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372">ISO |
| C++ 2011 standard</a>. The following table describes the Clang version |
| in which each feature became available.</p> |
| |
| <p>By default, Clang builds C++ code according to the C++98 standard, with many |
| C++11 features accepted as extensions. You can use Clang in C++11 mode with the |
| <code>-std=c++11</code> option. Clang's C++11 mode can be used |
| with <a href="http://libcxx.llvm.org/">libc++</a> or with gcc's libstdc++, but |
| patches are needed to make <a href="libstdc++4.4-clang0x.patch">libstdc++-4.4</a> |
| work with Clang in C++11 mode. Patches are also needed to make |
| <a href="libstdc++4.6-clang11.patch">libstdc++-4.6</a>, |
| and <a href="libstdc++4.7-clang11.patch">libstdc++-4.7</a> work with Clang |
| releases prior to version 3.2 in C++11 mode. <tt>thread_local</tt> support |
| currently requires g++-4.8's C++ runtime library.</p> |
| |
| <table width="689" border="1" cellspacing="0"> |
| <tr> |
| <th>Language Feature</th> |
| <th>C++11 Proposal</th> |
| <th>Available in Clang?</th> |
| </tr> |
| <tr> |
| <td>Rvalue references</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html">N2118</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td> Rvalue references for <code>*this</code></td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2439.htm">N2439</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Initialization of class objects by rvalues</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1610.html">N1610</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Non-static data member initializers</td> |
| <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2008/n2756.htm">N2756</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>Variadic templates</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2242.pdf">N2242</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td> Extending variadic template template parameters</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2555.pdf">N2555</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Initializer lists</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm">N2672</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| <tr> |
| <td>Static assertions</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.html">N1720</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td><code>auto</code>-typed variables</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf">N1984</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td> Multi-declarator <code>auto</code></td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1737.pdf">N1737</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td> Removal of auto as a storage-class specifier</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2546.htm">N2546</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td> New function declarator syntax</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2541.htm">N2541</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Lambda expressions</td> |
| <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2927.pdf">N2927</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| <tr> |
| <td>Declared type of an expression</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td> Incomplete return types</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3276.pdf">N3276</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| <tr> |
| <td>Right angle brackets</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Default template arguments for function templates</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#226">DR226</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Solving the SFINAE problem for expressions</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2634.html">DR339</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Alias templates</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf">N2258</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>Extern templates</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1987.htm">N1987</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Null pointer constant</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>Strongly-typed enums</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf">N2347</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Forward declarations for enums</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2764.pdf">N2764</a> |
| <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1206">DR1206</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| <tr> |
| <td>Generalized attributes</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2761.pdf">N2761</a></td> |
| <td class="svn" align="center">Clang 3.3 <a href="#n2761">(1)</a></td> |
| </tr> |
| <tr> |
| <td>Generalized constant expressions</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">N2235</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| <tr> |
| <td>Alignment support</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2341.pdf">N2341</a></td> |
| <td class="svn" align="center">Clang 3.3</td> |
| </tr> |
| <!-- Skipped N1627: Conditionally-support behavior --> |
| <!-- Skipped N1727: Changing Undefined Behavior into Diagnosable Errors --> |
| <tr> |
| <td>Delegating constructors</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986.pdf">N1986</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>Inheriting constructors</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2540.htm">N2540</a></td> |
| <td class="svn" align="center">Clang 3.3</td> |
| </tr> |
| <tr> |
| <td>Explicit conversion operators</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>New character types</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2249.html">N2249</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Unicode string literals</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>Raw string literals</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.htm">N2442</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>Universal character names in literals</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2170.html">N2170</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| <tr> |
| <td>User-defined literals</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2765.pdf">N2765</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| <tr> |
| <td>Standard Layout Types</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2342.htm">N2342</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>Defaulted functions</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>Deleted functions</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2346.htm">N2346</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Extended friend declarations</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1791.pdf">N1791</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Extending <code>sizeof</code></td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2253.html">N2253</a> |
| <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#850">DR850</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| <tr> |
| <td>Inline namespaces</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Unrestricted unions</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2544.pdf">N2544</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| <tr> |
| <td>Local and unnamed types as template arguments</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">N2657</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Range-based for</td> |
| <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2930.html">N2930</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>Explicit virtual overrides</td> |
| <td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2928.htm">N2928</a> |
| <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3206.htm">N3206</a> |
| <br><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3272.htm">N3272</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>Minimal support for garbage collection and reachability-based leak detection</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2670.htm">N2670</a></td> |
| <td class="na" align="center">N/A</td> |
| </tr> |
| <tr> |
| <td>Allowing move constructors to throw [noexcept]</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| <tr> |
| <td>Defining move special member functions</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3053.html">N3053</a></td> |
| <td class="full" align="center">Clang 3.0</td> |
| </tr> |
| |
| <tr class="separator"> |
| <th align="center" colspan="3">Concurrency</th> |
| </tr> |
| <tr> |
| <td>Sequence points</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2239.html">N2239</a></td> |
| <td class="svn" align="center">Clang 3.3</td> |
| </tr> |
| <tr> |
| <td>Atomic operations</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">N2427</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| <tr> |
| <td>Strong Compare and Exchange</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2748.html">N2748</a></td> |
| <td class="full" align="center">Clang 3.1 <a href="#n2748">(2)</a></td> |
| </tr> |
| <tr> |
| <td>Bidirectional Fences</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2752.htm">N2752</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| |
| <tr> |
| <td>Memory model</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2429.htm">N2429</a></td> |
| <td class="full" align="center">Clang 3.2</td> |
| </tr> |
| <tr> |
| <td>Data-dependency ordering: atomics and memory model</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2664.htm">N2664</a></td> |
| <td class="full" align="center">Clang 3.2 <a href="#n2664">(3)</a></td> |
| </tr> |
| <tr> |
| <td>Propagating exceptions</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html">N2179</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Abandoning a process and at_quick_exit</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2440.htm">N2440</a></td> |
| <td class="na" align="center">N/A</td> |
| </tr> |
| <tr> |
| <td>Allow atomics use in signal handlers</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2547.htm">N2547</a></td> |
| <td class="full" align="center">Clang 3.1</td> |
| </tr> |
| <tr> |
| <td>Thread-local storage</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2659.htm">N2659</a></td> |
| <td class="svn" align="center">Clang 3.3</td> |
| </tr> |
| <tr> |
| <td>Dynamic initialization and destruction with concurrency</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">N2660</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| |
| <tr class="separator"> |
| <th align="center" colspan="3">C99 Features in C++11</th> |
| </tr> |
| <tr> |
| <td><code>__func__</code> predefined identifier</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2340.htm">N2340</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>C99 preprocessor</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1653.htm">N1653</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td><code>long long</code></td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1811.pdf">N1811</a></td> |
| <td class="full" align="center">Clang 2.9</td> |
| </tr> |
| <tr> |
| <td>Extended integral types</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1988.pdf">N1988</a></td> |
| <td class="na" align="center">N/A <a href="#n1988">(4)</a></td> |
| </tr> |
| </table> |
| |
| <p> |
| <span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute |
| has no effect.</span><br> |
| <span id="n2748">(2): All compare-exchange operations are emitted as |
| strong compare-exchanges.</span><br> |
| <span id="n2664">(3): <code>memory_order_consume</code> is lowered to |
| <code>memory_order_acquire</code>.</span><br> |
| <span id="n1988">(4): <code>__int128</code> is not treated as an extended |
| integer type, because changing <code>intmax_t</code> would be an |
| ABI-incompatible change.</span> |
| </p> |
| |
| <h2 id="cxx14">C++1y implementation status</h2> |
| |
| <p>Clang is introducing support for the upcoming C++ language standard, |
| provisionally named C++1y. The following table describes which C++1y features |
| have been implemented in Clang and in which Clang version they became |
| available.</p> |
| |
| <p>You can use Clang in C++1y mode with the <code>-std=c++1y</code> option.</p> |
| |
| <table width="689" border="1" cellspacing="0"> |
| <tr> |
| <th>Language Feature</th> |
| <th>C++1y Proposal</th> |
| <th>Available in Clang?</th> |
| </tr> |
| <tr> |
| <td>Tweak to certain C++ contextual conversions</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3323.pdf">N3323</a></td> |
| <td class="none" align="center">No</td> |
| </tr> |
| <tr> |
| <td>Binary literals</td> |
| <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3472.pdf">N3472</a></td> |
| <td class="full" align="center">Yes</td> |
| </tr> |
| <tr> |
| <td>decltype(auto)</td> |
| <td rowspan=2 style="vertical-align:middle"><a href="http://isocpp.org/files/papers/N3638.html">N3638</a></td> |
| <td class="svn" align="center">Clang 3.3</td> |
| </tr> |
| <tr> |
| <td>Return type deduction for normal functions</td> |
| <td class="partial" align="center">Partial</td> |
| </tr> |
| <tr> |
| <td>Runtime-sized arrays with automatic storage duration</td> |
| <td><a href="http://isocpp.org/files/papers/N3639.html">N3639</a></td> |
| <td class="partial" align="center">Partial</td> |
| </tr> |
| <tr> |
| <td>Initialized lambda captures</td> |
| <td><a href="http://isocpp.org/files/papers/N3648.html">N3648</a></td> |
| <td class="none" align="center">No</td> |
| </tr> |
| <tr> |
| <td>Generic lambdas</td> |
| <td><a href="http://isocpp.org/files/papers/N3649.html">N3649</a></td> |
| <td class="partial" align="center"> |
| No [<a href="https://github.com/faisalv/clang-glambda">WIP</a>]</td> |
| </tr> |
| <tr> |
| <td>Variable templates</td> |
| <td><a href="http://isocpp.org/files/papers/N3651.pdf">N3651</a></td> |
| <td class="none" align="center">No</td> |
| </tr> |
| <tr> |
| <td>Relaxing requirements on constexpr functions</td> |
| <td><a href="http://isocpp.org/files/papers/N3652.html">N3652</a></td> |
| <td class="partial" align="center">Partial</td> |
| </tr> |
| <tr> |
| <td>Member initializers and aggregates</td> |
| <td><a href="http://isocpp.org/files/papers/N3653.html">N3653</a></td> |
| <td class="svn" align="center">Clang 3.3</td> |
| </tr> |
| <tr> |
| <td>Clarifying memory allocation</td> |
| <td><!--<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3664.html">-->N3664<!--</a>--></td> |
| <td class="full" align="center">Yes</td> |
| </tr> |
| </table> |
| |
| </div> |
| </body> |
| </html> |
