[clang] b9c0e59 - [Clang][NFC] Present language version in descending publication date
Corentin Jabot via cfe-commits
cfe-commits at lists.llvm.org
Mon May 15 23:53:28 PDT 2023
Author: Corentin Jabot
Date: 2023-05-16T08:52:44+02:00
New Revision: b9c0e590f1fd4ea37da5c2b9b78d8e715c885f56
URL: https://github.com/llvm/llvm-project/commit/b9c0e590f1fd4ea37da5c2b9b78d8e715c885f56
DIFF: https://github.com/llvm/llvm-project/commit/b9c0e590f1fd4ea37da5c2b9b78d8e715c885f56.diff
LOG: [Clang][NFC] Present language version in descending publication date
Added:
Modified:
clang/www/cxx_status.html
Removed:
################################################################################
diff --git a/clang/www/cxx_status.html b/clang/www/cxx_status.html
index 564c3d6a8c48c..91706be09f158 100755
--- a/clang/www/cxx_status.html
+++ b/clang/www/cxx_status.html
@@ -30,45 +30,45 @@ <h1>C++ Support in Clang</h1>
<p>Clang implements the following published and upcoming ISO C++ standards:</p>
<table width="689" border="1" cellspacing="0">
+ <tr>
+ <th>Language Standard</th>
+ <th>Flag</th>
+ <th>Available in Clang?</th>
+ </tr>
+ <tr>
+ <td><a href="#cxx26">C++2c</a></td>
+ <td><tt>-std=c++2c</tt></td>
+ <td class="partial" align="center">Partial</td>
+ </tr>
<tr>
- <th>Language Standard</th>
- <th>Flag</th>
- <th>Available in Clang?</th>
-</tr>
-<tr>
- <td><a href="#cxx98">C++98 / C++03</a></td>
- <td><tt>-std=c++98</tt></td>
- <td class="full" align="center">Yes (other than <tt>export</tt>)</td>
-</tr>
-<tr>
- <td><a href="#cxx11">C++11</a></td>
- <td><tt>-std=c++11</tt></td>
- <td class="full" align="center">Clang 3.3</td>
-</tr>
-<tr>
- <td><a href="#cxx14">C++14</a></td>
- <td><tt>-std=c++14</tt></td>
- <td class="full" align="center">Clang 3.4</td>
-</tr>
-<tr>
- <td><a href="#cxx17">C++17</a></td>
- <td><tt>-std=c++17</tt></td>
- <td class="full" align="center">Clang 5</td>
-</tr>
-<tr>
- <td><a href="#cxx20">C++20</a></td>
- <td><tt>-std=c++20</tt></td>
- <td class="partial" align="center">Partial</td>
-</tr>
-<tr>
- <td><a href="#cxx23">C++23</a></td>
- <td><tt>-std=c++23</tt></td>
- <td class="partial" align="center">Partial</td>
-</tr>
-<tr>
- <td><a href="#cxx26">C++2c</a></td>
- <td><tt>-std=c++2c</tt></td>
- <td class="partial" align="center">Partial</td>
+ <td><a href="#cxx23">C++23</a></td>
+ <td><tt>-std=c++23</tt></td>
+ <td class="partial" align="center">Partial</td>
+ </tr>
+ <tr>
+ <td><a href="#cxx20">C++20</a></td>
+ <td><tt>-std=c++20</tt></td>
+ <td class="partial" align="center">Partial</td>
+ </tr>
+ <tr>
+ <td><a href="#cxx17">C++17</a></td>
+ <td><tt>-std=c++17</tt></td>
+ <td class="full" align="center">Clang 5</td>
+ </tr>
+ <tr>
+ <td><a href="#cxx14">C++14</a></td>
+ <td><tt>-std=c++14</tt></td>
+ <td class="full" align="center">Clang 3.4</td>
+ </tr>
+ <tr>
+ <td><a href="#cxx11">C++11</a></td>
+ <td><tt>-std=c++11</tt></td>
+ <td class="full" align="center">Clang 3.3</td>
+ </tr>
+ <tr>
+ <td><a href="#cxx98">C++98 / C++03</a></td>
+ <td><tt>-std=c++98</tt></td>
+ <td class="full" align="center">Yes (other than <tt>export</tt>)</td>
</tr>
</table>
@@ -85,513 +85,735 @@ <h1>C++ Support in Clang</h1>
the "c++" label, as well as mode-specific labels such as "c++11", "c++14",
and so on, to track known bugs with Clang's language conformance.</p>
-<h2 id="cxx98">C++98 implementation status</h2>
+<h2 id="cxx26">C++2c implementation status</h2>
-<p>Clang implements all of the ISO C++ 1998 standard
- (including the defects addressed in the ISO C++ 2003 standard)
- except for <tt>export</tt> (which was removed in C++11).
+<!-- TODO add link to the ISO Standard after it's published. -->
+<p>Clang has support for some of the features of the C++ standard following
+C++23, informally referred to as C++26.</p>
-<h2 id="cxx11">C++11 implementation status</h2>
+<p>You can use Clang in C++2c mode with the <code>-std=c++2c</code> option.</p>
-<p>Clang 3.3 and later implement all of the <a
- href="https://www.iso.org/standard/50372.html">ISO
- C++ 2011 standard</a>.</p>
+<details open>
+<summary>List of features and minimum Clang version with support</summary>
+<table width="689" border="1" cellspacing="0">
+ <tr>
+ <th>Language Feature</th>
+ <th>C++26 Proposal</th>
+ <th>Available in Clang?</th>
+ </tr>
+</table>
+</details>
-<p>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="https://libcxx.llvm.org/">libc++</a> or with gcc's libstdc++.</p>
-<details>
+<h2 id="cxx23">C++23 implementation status</h2>
+
+<!-- TODO add link to the ISO Standard after it's published. -->
+<p>Clang has support for some of the features of the ISO C++ 2023 standard.</p>
+
+<p>You can use Clang in C++23 mode with the <code>-std=c++23</code> option.</p>
+
+<details open>
<summary>List of features and minimum Clang version with support</summary>
<table width="689" border="1" cellspacing="0">
<tr>
<th>Language Feature</th>
- <th>C++11 Proposal</th>
+ <th>C++23 Proposal</th>
<th>Available in Clang?</th>
</tr>
- <tr>
- <td rowspan="2">Rvalue references</td>
- <td><a href="https://wg21.link/n2118">N2118</a></td>
- <td class="full" align="center">Clang 2.9</td>
- <tr> <!-- from Kona 2019-->
- <td><a href="https://wg21.link/p1825r0">P1825R0</a> (<a href="#dr">DR</a>)</td>
- <td class="full" align="center">Clang 13</td>
- </tr>
- </tr>
+ <!-- Fall 2020 papers -->
<tr>
- <td> Rvalue references for <code>*this</code></td>
- <td><a href="https://wg21.link/n2439">N2439</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Literal suffix <tt>uz</tt>, <tt>z</tt> for <tt>size_t</tt>, <tt>ssize_t</tt></td>
+ <td><a href="https://wg21.link/p0330r8">P0330R8</a></td>
+ <td class="full" align="center">Clang 13</td>
</tr>
+ <!-- Spring 2021 papers -->
<tr>
- <td>Initialization of class objects by rvalues</td>
- <td><a href="https://wg21.link/n1610">N1610</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Make <tt>()</tt> in lambdas optional in all cases</td>
+ <td><a href="https://wg21.link/p1102r2">P1102R2</a></td>
+ <td class="full" align="center">Clang 13</td>
</tr>
<tr>
- <td>Non-static data member initializers</td>
- <td><a href="https://wg21.link/n2756">N2756</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>Simpler implicit move</td>
+ <td><a href="https://wg21.link/p2266r1">P2266R1</a></td>
+ <td class="full" align="center">Clang 13</td>
</tr>
<tr>
- <td>Variadic templates</td>
- <td><a href="https://wg21.link/n2242">N2242</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td><tt>if consteval</tt></td>
+ <td><a href="https://wg21.link/P1938R3">P1938R3</a></td>
+ <td class="full" align="center">Clang 14</td>
</tr>
<tr>
- <td> Extending variadic template template parameters</td>
- <td><a href="https://wg21.link/n2555">N2555</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Allow duplicate attributes</td>
+ <td><a href="https://wg21.link/P2156R1">P2156R1</a></td>
+ <td class="full" align="center">Clang 13</td>
</tr>
<tr>
- <td rowspan="3">Initializer lists</td>
- <td><a href="https://wg21.link/n2672">N2672</a></td>
- <td class="full" align="center">Clang 3.1</td>
+ <td>Narrowing contextual conversions to bool</td>
+ <td><a href="https://wg21.link/P1401R5">P1401R5</a></td>
+ <td class="full" align="center">Clang 14</td>
</tr>
- <tr> <!-- from Kona 2019-->
- <td><a href="https://wg21.link/p1009r2">P1009R2</a> (<a href="#dr">DR</a>)</td>
- <td class="full" align="center">Clang 9</td>
- </tr>
- <tr> <!-- from Prague-->
- <td><a href="https://wg21.link/p1957r2">P1957R2</a> (<a href="#dr">DR</a>)</td>
- <td class="full" align="center">Clang 11</td>
- </tr>
<tr>
- <td>Static assertions</td>
- <td><a href="https://wg21.link/n1720">N1720</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Trimming whitespaces before line splicing</td>
+ <td><a href="https://wg21.link/P2223R2">P2223R2</a></td>
+ <td class="full" align="center">Yes</td>
</tr>
<tr>
- <td><code>auto</code>-typed variables</td>
- <td><a href="https://wg21.link/n1984">N1984</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Make declaration order layout mandated</td>
+ <td><a href="https://wg21.link/p1847r4">P1874R4</a></td>
+ <td class="full" align="center">Yes</td>
</tr>
<tr>
- <td> Multi-declarator <code>auto</code></td>
- <td><a href="https://wg21.link/n1737">N1737</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>C++ identifier syntax using UAX 31</td>
+ <td><a href="https://wg21.link/P1949R7">P1949R7</a></td>
+ <td class="full" align="center">Clang 14</td>
</tr>
<tr>
- <td> Removal of auto as a storage-class specifier</td>
- <td><a href="https://wg21.link/n2546">N2546</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Mixed string literal concatenation</td>
+ <td><a href="https://wg21.link/p2201r1">P2201R1</a></td>
+ <td class="full" align="center">Yes</td>
</tr>
+ <!-- October 2021 papers -->
<tr>
- <td> New function declarator syntax</td>
- <td><a href="https://wg21.link/n2541">N2541</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td rowspan=2>Deducing this</td>
+ <td><a href="https://wg21.link/P0847R7">P0847R7</a></td>
+ <td class="none" align="center">No</td>
</tr>
<tr>
- <td rowspan="2">Lambda expressions</td>
- <td><a href="https://wg21.link/n2927">N2927</a></td>
- <td class="full" align="center">Clang 3.1</td>
+ <td><a href="https://wg21.link/P2797R0">P2797R0</a></td>
+ <td class="none" align="center">No</td>
</tr>
- <tr>
- <!-- from Albuquerque 2017 -->
- <td><a href="https://wg21.link/p0588r1">P0588R1</a> (<a href="#dr">DR</a>)</td>
- <td class="none" align="center">No</td>
- </tr>
<tr>
- <td>Declared type of an expression</td>
- <td><a href="https://wg21.link/n2343">N2343</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td rowspan=2>Change scope of lambda trailing-return-type</td>
+ <td><a href="https://wg21.link/P2036R3">P2036R3</a></td>
+ <td rowspan=2 class="unreleased" align="center">Clang 17</td>
</tr>
<tr>
- <td> Incomplete return types</td>
- <td><a href="https://wg21.link/n3276">N3276</a></td>
- <td class="full" align="center">Clang 3.1</td>
+ <td><a href="https://wg21.link/P2579R0">P2579R0</a></td>
</tr>
<tr>
- <td>Right angle brackets</td>
- <td><a href="https://wg21.link/n1757">N1757</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Multidimensional subscript operator</td>
+ <td><a href="https://wg21.link/P2128R6">P2128R6</a></td>
+ <td class="full" align="center">Clang 15</td>
</tr>
<tr>
- <td>Default template arguments for function templates</td>
- <td><a href="https://wg21.link/cwg226">DR226</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Non-literal variables (and labels and gotos) in constexpr functions</td>
+ <td><a href="https://wg21.link/P2242R3">P2242R3</a></td>
+ <td class="full" align="center">Clang 15</td>
</tr>
<tr>
- <td>Solving the SFINAE problem for expressions</td>
- <td><a href="https://wg21.link/n2634">DR339</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Character encoding of diagnostic text</td>
+ <td><a href="https://wg21.link/P2246R1">P2246R1</a></td>
+ <td class="full" align="center">Yes</td>
</tr>
<tr>
- <td>Alias templates</td>
- <td><a href="https://wg21.link/n2258">N2258</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>Character sets and encodings</td>
+ <td><a href="https://wg21.link/P2314R4">P2314R4</a></td>
+ <td class="full" align="center">Yes</td>
</tr>
<tr>
- <td>Extern templates</td>
- <td><a href="https://wg21.link/n1987">N1987</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Consistent character literal encoding</td>
+ <td><a href="https://wg21.link/P2316R2">P2316R2</a></td>
+ <td class="full" align="center">Yes</td>
</tr>
<tr>
- <td>Null pointer constant</td>
- <td><a href="https://wg21.link/n2431">N2431</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>Add support for preprocessing directives elifdef and elifndef</td>
+ <td><a href="https://wg21.link/P2334R1">P2334R1</a></td>
+ <td class="full" align="center">Clang 13</td>
</tr>
<tr>
- <td>Strongly-typed enums</td>
- <td><a href="https://wg21.link/n2347">N2347</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Extend init-statement to allow alias-declaration</td>
+ <td><a href="https://wg21.link/P2360R0">P2360R0</a></td>
+ <td class="full" align="center">Clang 14</td>
</tr>
<tr>
- <td>Forward declarations for enums</td>
- <td><a href="https://wg21.link/n2764">N2764</a>
- <br><a href="https://wg21.link/cwg1206">DR1206</a></td>
- <td class="full" align="center">Clang 3.1</td>
+ <td>auto(x): decay-copy in the language</td>
+ <td><a href="https://wg21.link/P0849R8">P0849R8</a></td>
+ <td class="full" align="center">Clang 15</td>
</tr>
+ <!-- February 2022 papers -->
<tr>
- <td>Standardized attribute syntax</td>
- <td><a href="https://wg21.link/n2761">N2761</a></td>
- <td class="full" align="center">Clang 3.3 <a href="#n2761">(1)</a></td>
+ <td>Attributes on Lambda-Expressions</td>
+ <td><a href="https://wg21.link/P2173R1">P2173R1</a></td>
+ <td class="full" align="center">Clang 13</td>
</tr>
<tr>
- <td rowspan="2">Generalized constant expressions</td>
- <td><a href="https://wg21.link/n2235">N2235</a></td>
- <td class="full" align="center">Clang 3.1</td>
+ <td><tt>constexpr</tt> for <tt><cmath></tt> and <tt><cstdlib></tt></td>
+ <td><a href="https://wg21.link/P0533R9">P0533R9</a></td>
+ <td class="none" align="center">No</td>
</tr>
- <tr>
- <!-- from Albuquerque 2017 -->
- <td><a href="https://wg21.link/p0859r0">P0859R0</a> (<a href="#dr">DR</a>)</td>
- <td class="full" align="center">Clang 8</td>
- </tr>
<tr>
- <td>Alignment support</td>
- <td><a href="https://wg21.link/n2341">N2341</a></td>
- <td class="full" align="center">Clang 3.3</td>
+ <td>Type trait to determine if a reference binds to a temporary</td>
+ <td><a href="https://wg21.link/P2255R2">P2255R2</a></td>
+ <td class="partial" align="center">
+ <details><summary>Partial</summary>
+ Clang provides a <tt>__reference_binds_to_temporary</tt> type trait
+ builtin, with which the library facility can be partially implemented.
+ Both <tt>__reference_constructs_from_temporary</tt> and
+ <tt>__reference_converts_from_temporary</tt> builtins should be
+ provided, following the normal cross-vendor convention to implement
+ traits requiring compiler support directly.
+ </details></td>
+ </td>
</tr>
+ <!-- July 2022 papers -->
<tr>
- <td>Conditionally-support behavior</td>
- <td><a href="https://wg21.link/n1627">N1627</a></td>
- <td class="full" align="center">Clang 2.9</td>
- </tr>
- <tr>
- <td>Changing undefined behavior into diagnosable errors</td>
- <td><a href="https://wg21.link/n1727">N1727</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>The Equality Operator You Are Looking For</td>
+ <td><a href="https://wg21.link/P2468R2">P2468R2</a></td>
+ <td class="full" align="center">Clang 16</td>
</tr>
<tr>
- <td>Delegating constructors</td>
- <td><a href="https://wg21.link/n1986">N1986</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>De-deprecating volatile compound operations</td>
+ <td><a href="https://wg21.link/P2327R1">P2327R1</a></td>
+ <td class="full" align="center">Clang 15</td>
</tr>
<tr>
- <td rowspan="2">Inheriting constructors</td>
- <td><a href="https://wg21.link/n2540">N2540</a></td>
- <td class="full" align="center">Clang 3.3</td>
+ <td>Support for <code>#warning</code></td>
+ <td><a href="https://wg21.link/P2437R1">P2437R1</a></td>
+ <td class="full" align="center">Yes</td>
</tr>
- <tr>
- <!-- from Kona 2015 -->
- <td><a href="https://wg21.link/p0136r1">P0136R1</a> (<a href="#dr">DR</a>)</td>
- <td class="full" align="center">Clang 3.9</td>
- </tr>
<tr>
- <td>Explicit conversion operators</td>
- <td><a href="https://wg21.link/n2437">N2437</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>Remove non-encodable wide character literals and multicharacter wide character literals</td>
+ <td><a href="https://wg21.link/P2362R3">P2362R3</a></td>
+ <td class="full" align="center">Clang 14</td>
</tr>
<tr>
- <td>New character types</td>
- <td><a href="https://wg21.link/n2249">N2249</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Labels at the end of compound statements</td>
+ <td><a href="https://wg21.link/P2324R2">P2324R2</a></td>
+ <td class="full" align="center">Clang 16</td>
</tr>
<tr>
- <td>Unicode string literals</td>
- <td><a href="https://wg21.link/n2442">N2442</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>Delimited escape sequences</td>
+ <td><a href="https://wg21.link/P2290R3">P2290R3</a></td>
+ <td class="full" align="center">Clang 15</td>
</tr>
<tr>
- <td>Raw string literals</td>
- <td><a href="https://wg21.link/n2442">N2442</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>Named universal character escapes</td>
+ <td><a href="https://wg21.link/P2071R2">P2071R2</a></td>
+ <td class="full" align="center">Clang 15</td>
</tr>
<tr>
- <td>Universal character names in literals</td>
- <td><a href="https://wg21.link/n2170">N2170</a></td>
- <td class="full" align="center">Clang 3.1</td>
+ <td>Relaxing some constexpr restrictions</td>
+ <td><a href="https://wg21.link/P2448R2">P2448R2</a></td>
+ <td class="partial" align="center">
+ <details><summary>Clang 17 (Partial)</summary>
+ We do not support outside of defaulted special memeber functions the change that constexpr functions no
+ longer have to be constexpr compatible but rather support a less restricted requirements for constexpr
+ functions. Which include allowing non-literal types as return values and parameters, allow calling of
+ non-constexpr functions and constructors.
+ </details></td>
+ </td>
</tr>
<tr>
- <td>User-defined literals</td>
- <td><a href="https://wg21.link/n2765">N2765</a></td>
- <td class="full" align="center">Clang 3.1</td>
+ <td>Using unknown pointers and references in constant expressions</td>
+ <td><a href="https://wg21.link/P2280R4">P2280R4</a></td>
+ <td class="none" align="center">No</td>
</tr>
<tr>
- <td>Standard Layout Types</td>
- <td><a href="https://wg21.link/n2342">N2342</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>static <code>operator()</code></td>
+ <td><a href="https://wg21.link/P1169R4">P1169R4</a></td>
+ <td class="full" align="center">Clang 16</td>
</tr>
<tr>
- <td rowspan="2">Defaulted functions</td>
- <td><a href="https://wg21.link/n2346">N2346</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>Extended floating-point types and standard names</td>
+ <td><a href="https://wg21.link/P1467R9">P1467R9</a></td>
+ <td class="none" align="center">No</td>
</tr>
- <tr> <!-- from Kona 2019-->
- <td><a href="https://wg21.link/p1286r2">P1286R2</a> (<a href="#dr">DR</a>)</td>
- <td class="full" align="center">Clang 9</td>
- </tr>
<tr>
- <td>Deleted functions</td>
- <td><a href="https://wg21.link/n2346">N2346</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Class template argument deduction from inherited constructors</td>
+ <td><a href="https://wg21.link/P2582R1">P2582R1</a></td>
+ <td class="none" align="center">No</td>
</tr>
<tr>
- <td>Extended friend declarations</td>
- <td><a href="https://wg21.link/n1791">N1791</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Portable assumptions</td>
+ <td><a href="https://wg21.link/P1774R8">P1774R8</a></td>
+ <td class="none" align="center">No</td>
</tr>
<tr>
- <td>Extending <code>sizeof</code></td>
- <td><a href="https://wg21.link/n2253">N2253</a>
- <br><a href="https://wg21.link/cwg850">DR850</a></td>
- <td class="full" align="center">Clang 3.1</td>
+ <td>Support for UTF-8 as a portable source file encoding</td>
+ <td><a href="https://wg21.link/P2295R6">P2295R6</a></td>
+ <td class="full" align="center">Clang 15</td>
</tr>
<tr>
- <td>Inline namespaces</td>
- <td><a href="https://wg21.link/n2535">N2535</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td><code>char8_t</code> Compatibility and Portability Fix</td>
+ <td><a href="https://wg21.link/P2513R3">P2513R3</a></td>
+ <td class="full" align="center">Clang 16</td>
</tr>
<tr>
- <td>Unrestricted unions</td>
- <td><a href="https://wg21.link/n2544">N2544</a></td>
- <td class="full" align="center">Clang 3.1</td>
+ <td>Relax requirements on <code>wchar_t</code> to match existing practices</td>
+ <td><a href="https://wg21.link/P2460R2">P2460R2</a></td>
+ <td class="full" align="center">Yes</td>
</tr>
<tr>
- <td>Local and unnamed types as template arguments</td>
- <td><a href="https://wg21.link/n2657">N2657</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Explicit lifetime management</td>
+ <td><a href="https://wg21.link/P2590R2">P2590R2</a></td>
+ <td class="none" align="center">No</td>
</tr>
+ <!-- November 2022 (Kona) papers -->
<tr>
- <td rowspan="2">Range-based for</td>
- <td><a href="https://wg21.link/n2930">N2930</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>static <code>operator[]</code></td>
+ <td><a href="https://wg21.link/P2589R1">P2589R1</a></td>
+ <td class="full" align="center">Clang 16</td>
</tr>
- <tr>
- <!-- from Jacksonville 2018 -->
- <td><a href="https://wg21.link/p0962r1">P0962R1</a> (<a href="#dr">DR</a>)</td>
- <td class="full" align="center">Clang 8</td>
- </tr>
<tr>
- <td>Explicit virtual overrides</td>
- <td><a href="https://wg21.link/n2928">N2928</a>
- <br><a href="https://wg21.link/n3206">N3206</a>
- <br><a href="https://wg21.link/n3272">N3272</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>Permitting static constexpr variables in constexpr functions</td>
+ <td><a href="https://wg21.link/P2647R1">P2647R1</a></td>
+ <td class="full" align="center">Clang 16</td>
</tr>
<tr>
- <td>Minimal support for garbage collection and reachability-based leak detection</td>
- <td><a href="https://wg21.link/n2670">N2670</a></td>
- <td class="na" align="center">N/A <a href="#n2670">(2)</a></td>
+ <td>consteval needs to propagate up</td>
+ <td><a href="https://wg21.link/P2564R3">P2564R3</a> (<a href="#dr">DR</a>)</td>
+ <td class="none" align="center">No</td>
</tr>
<tr>
- <td>Allowing move constructors to throw [noexcept]</td>
- <td><a href="https://wg21.link/n3050">N3050</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>Lifetime extension in range-based for loops</td>
+ <td><a href="https://wg21.link/P2718R0">P2718R0</a></td>
+ <td class="none" align="center">No</td>
</tr>
+ <!--Issaquah 2023 papers-->
<tr>
- <td>Defining move special member functions</td>
- <td><a href="https://wg21.link/n3053">N3053</a></td>
- <td class="full" align="center">Clang 3.0</td>
+ <td>Referencing The Unicode Standard</td>
+ <td><a href="https://wg21.link/P2736R2">P2736R2</a></td>
+ <td class="full" align="center">Yes</td>
</tr>
+</table>
+</details>
- <tr class="separator">
- <th align="center" colspan="3">Concurrency</th>
- </tr>
- <tr>
- <td>Sequence points</td>
- <td><a href="https://wg21.link/n2239">N2239</a></td>
- <td class="full" align="center">Clang 3.3</td>
- </tr>
- <tr>
- <td>Atomic operations</td>
- <td><a href="https://wg21.link/n2427">N2427</a></td>
- <td class="full" align="center">Clang 3.1</td>
- </tr>
- <tr>
- <td>Strong Compare and Exchange</td>
- <td><a href="https://wg21.link/n2748">N2748</a></td>
- <td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td>
- </tr>
- <tr>
- <td>Bidirectional Fences</td>
- <td><a href="https://wg21.link/n2752">N2752</a></td>
- <td class="full" align="center">Clang 3.1</td>
- </tr>
+<h2 id="cxx20">C++20 implementation status</h2>
+
+<p>Clang has support for some of the features of the
+<a href="https://www.iso.org/standard/79358.html">ISO C++ 2020 standard</a>.</p>
+
+<p>You can use Clang in C++20 mode with the <code>-std=c++20</code> option
+(use <code>-std=c++2a</code> in Clang 9 and earlier).</p>
+
+<details open>
+<summary>List of features and minimum Clang version with support</summary>
+
+<table width="689" border="1" cellspacing="0">
+ <tr>
+ <th>Language Feature</th>
+ <th>C++20 Proposal</th>
+ <th>Available in Clang?</th>
+ </tr>
+ <!-- Toronto 2017 papers -->
<tr>
- <td>Memory model</td>
- <td><a href="https://wg21.link/n2429">N2429</a></td>
- <td class="full" align="center">Clang 3.2</td>
+ <td>Default member initializers for bit-fields</td>
+ <td><a href="https://wg21.link/p0683r1">P0683R1</a></td>
+ <td class="full" align="center">Clang 6</td>
</tr>
<tr>
- <td>Data-dependency ordering: atomics and memory model</td>
- <td><a href="https://wg21.link/n2664">N2664</a></td>
- <td class="full" align="center">Clang 3.2 <a href="#n2664">(4)</a></td>
+ <td><tt>const&</tt>-qualified pointers to members</td>
+ <td><a href="https://wg21.link/p0704r1">P0704R1</a></td>
+ <td class="full" align="center">Clang 6</td>
</tr>
<tr>
- <td>Propagating exceptions</td>
- <td><a href="https://wg21.link/n2179">N2179</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Allow <i>lambda-capture</i> <tt>[=, this]</tt></td>
+ <td><a href="https://wg21.link/p0409r2">P0409R2</a></td>
+ <td class="full" align="center">Clang 6</td>
</tr>
<tr>
- <td>Allow atomics use in signal handlers</td>
- <td><a href="https://wg21.link/n2547">N2547</a></td>
- <td class="full" align="center">Clang 3.1</td>
+ <td rowspan="2"><tt>__VA_OPT__</tt> for preprocessor comma elision</td>
+ <td><a href="https://wg21.link/p0306r4">P0306R4</a></td>
+ <td class="full" align="center">Clang 6</td>
</tr>
+ <tr> <!-- from Rapperswil -->
+ <td><a href="https://wg21.link/p1042r1">P1042R1</a></td>
+ <td class="full" align="center">Clang 9</td>
+ </tr>
<tr>
- <td>Thread-local storage</td>
- <td><a href="https://wg21.link/n2659">N2659</a></td>
- <td class="full" align="center">Clang 3.3 <a href="#n2659">(5)</a></td>
+ <td>Designated initializers</td>
+ <td><a href="https://wg21.link/p0329r4">P0329R4</a></td>
+ <td class="full" align="center">Clang 10</td>
</tr>
<tr>
- <td>Dynamic initialization and destruction with concurrency</td>
- <td><a href="https://wg21.link/n2660">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>
+ <td><i>template-parameter-list</i> for generic lambdas</td>
+ <td><a href="https://wg21.link/p0428r2">P0428R2</a></td>
+ <td class="full" align="center">Clang 9</td>
</tr>
- <tr>
- <td><code>__func__</code> predefined identifier</td>
- <td><a href="https://wg21.link/n2340">N2340</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <tr id="p0734">
+ <td rowspan="13">Concepts</td>
+ <td><a href="https://wg21.link/p0734r0">P0734R0</a></td>
+ <td class="full" align="center">Clang 10</td>
</tr>
+ <tr> <!-- from Albuquerque -->
+ <td><a href="https://wg21.link/p0857r0">P0857R0</a></td>
+ <td rowspan="1" class="full" align="center">Clang 16</td>
+ </tr>
+ <tr> <!-- from San Diego -->
+ <td><a href="https://wg21.link/p1084r2">P1084R2</a></td>
+ <td rowspan="2" class="full" align="center">Clang 10</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1141r2">P1141R2</a></td>
+ </tr>
+ <tr> <!-- from Cologne -->
+ <td><a href="https://wg21.link/p0848r3">P0848R3</a></td>
+ <td rowspan="1" class="partial" align="center">
+ <details>
+ <summary>Clang 16 (Partial)</summary>
+ Because of other concepts implementation deficits, the __cpp_concepts macro is not yet set to 202002L.
+ Also, the related defect reports <a href="https://wg21.link/cwg1496">DR1496</a> and
+ <a href="https://wg21.link/cwg1734">DR1734</a> are not yet implemented. Accordingly, deleted
+ special member functions are treated as eligible even though they shouldn't be.
+ </details>
+ </td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1616r1">P1616R1</a></td>
+ <td rowspan="2" class="full" align="center">Clang 10</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1452r2">P1452R2</a></td>
+ </tr>
+ <tr> <!-- from Belfast -->
+ <td><a href="https://wg21.link/p1972r0">P1972R0</a></td>
+ <td rowspan="4" class="full" align="center">Clang 10</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1980r0">P1980R0</a></td>
+ </tr>
+ <tr> <!-- from Prague -->
+ <td><a href="https://wg21.link/p2103r0">P2103R0</a></td>
+ </tr>
+ <tr> <!-- from February 2022 -->
+ <td><a href="https://wg21.link/p2493r0">P2493R0</a></td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p2092r0">P2092R0</a></td>
+ <td rowspan="1" class="full" align="center">Clang 16</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p2113r0">P2113R0</a></td>
+ <td rowspan="1" class="full" align="center">Clang 16</td>
+ </tr>
+ <!-- Albuquerque papers -->
<tr>
- <td>C99 preprocessor</td>
- <td><a href="https://wg21.link/n1653">N1653</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Range-based for statements with initializer</td>
+ <td><a href="https://wg21.link/p0614r1">P0614R1</a></td>
+ <td class="full" align="center">Clang 8</td>
</tr>
<tr>
- <td><code>long long</code></td>
- <td><a href="https://wg21.link/n1811">N1811</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>ADL and function templates that are not visible</td>
+ <td><a href="https://wg21.link/p0846r0">P0846R0</a></td>
+ <td class="full" align="center">Clang 9</td>
</tr>
<tr>
- <td>Extended integral types</td>
- <td><a href="https://wg21.link/n1988">N1988</a></td>
- <td class="na" align="center">N/A <a href="#n1988">(6)</a></td>
+ <td><tt>const</tt> mismatch with defaulted copy constructor</td>
+ <td><a href="https://wg21.link/p0641r2">P0641R2</a></td>
+ <td class="full" align="center">Clang 8</td>
</tr>
-</table>
-
-<p>
-<span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute
-has no effect.</span><br>
-<span id="n2670">(2): No compiler changes are required for an implementation
-such as Clang that does not provide garbage collection.</span><br>
-<span id="n2748">(3): All compare-exchange operations are emitted as
-strong compare-exchanges.</span><br>
-<span id="n2664">(4): <code>memory_order_consume</code> is lowered to
-<code>memory_order_acquire</code>.</span><br>
-<span id="n2659">(5): <code>thread_local</code> support
-requires a C++ runtime library providing <code>__cxa_thread_atexit</code>, such
-as <a href="https://libcxxabi.llvm.org">libc++abi</a> 3.6 or later,
-or libsupc++ 4.8 or later.</span><br>
-<span id="n1988">(6): No compiler changes are required for an implementation
-such as Clang that does not provide any extended integer types.
-<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>
-</details>
-
-<h2 id="cxx14">C++14 implementation status</h2>
-
-<p>Clang 3.4 and later implement all of the <a
- href="https://www.iso.org/standard/64029.html">ISO
- C++ 2014 standard</a>.</p>
-
-<p>You can use Clang in C++14 mode with the <code>-std=c++14</code> option
-(use <code>-std=c++1y</code> in Clang 3.4 and earlier).</p>
-
-<details>
-<summary>List of features and minimum Clang version with support</summary>
-
-<table width="689" border="1" cellspacing="0">
- <tr>
- <th>Language Feature</th>
- <th>C++14 Proposal</th>
- <th>Available in Clang?</th>
- </tr>
<tr>
- <td>Tweak to certain C++ contextual conversions</td>
- <td><a href="https://wg21.link/n3323">N3323</a></td>
- <td class="full" align="center">Clang 3.4</td>
+ <td rowspan="10">Consistent comparison (<tt>operator<=></tt>)</td>
+ <td><a href="https://wg21.link/p0515r3">P0515R3</a></td>
+ <td rowspan="8" class="full" align="center">Clang 10</td>
</tr>
+ <tr> <!-- from Jacksonville -->
+ <td><a href="https://wg21.link/p0905r1">P0905R1</a></td>
+ </tr>
+ <tr> <!-- from Rapperswil -->
+ <td><a href="https://wg21.link/p1120r0">P1120R0</a></td>
+ </tr>
+ <tr> <!-- from Kona 2019 -->
+ <td><a href="https://wg21.link/p1185r2">P1185R2</a></td>
+ </tr>
+ <tr> <!-- from Cologne -->
+ <td><a href="https://wg21.link/p1186r3">P1186R3</a></td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1630r1">P1630R1</a></td>
+ </tr>
+ <tr> <!-- from Belfast -->
+ <td><a href="https://wg21.link/p1946r0">P1946R0</a></td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1959r0">P1959R0</a></td>
+ </tr>
+ <tr> <!-- from Prague -->
+ <td><a href="https://wg21.link/p2002r1">P2002R1</a></td>
+ <td class="partial" align="center">Partial</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p2085r0">P2085R0</a></td>
+ <td class="full" align="center">Clang 14</td>
+ </tr>
<tr>
- <td>Binary literals</td>
- <td><a href="https://wg21.link/n3472">N3472</a></td>
- <td class="full" align="center">Clang 2.9</td>
+ <td>Access checking on specializations</td>
+ <td><a href="https://wg21.link/p0692r1">P0692R1</a></td>
+ <td class="full" align="center">Clang 14</td>
</tr>
<tr>
- <td>decltype(auto)</td>
- <td rowspan=2 style="vertical-align:middle"><a href="https://wg21.link/n3638">N3638</a></td>
- <td class="full" align="center">Clang 3.3</td>
+ <td>Default constructible and assignable stateless lambdas</td>
+ <td><a href="https://wg21.link/p0624r2">P0624R2</a></td>
+ <td class="full" align="center">Clang 8</td>
</tr>
<tr>
- <td>Return type deduction for normal functions</td>
- <td class="full" align="center">Clang 3.4</td>
+ <td>Lambdas in unevaluated contexts</td>
+ <td><a href="https://wg21.link/p0315r4">P0315R4</a></td>
+ <td class="full" align="center">Clang 17</td>
</tr>
+ <!-- Jacksonville papers -->
<tr>
- <td>Initialized lambda captures</td>
- <td><a href="https://wg21.link/n3648">N3648</a></td>
- <td class="full" align="center">Clang 3.4</td>
+ <td><tt>[[no_unique_address]]</tt> attribute</td>
+ <td><a href="https://wg21.link/p0840r2">P0840R2</a></td>
+ <td class="full" align="center">Clang 9</td>
</tr>
<tr>
- <td>Generic lambdas</td>
- <td><a href="https://wg21.link/n3649">N3649</a></td>
- <td class="full" align="center">Clang 3.4</td>
+ <td><tt>[[likely]]</tt> and <tt>[[unlikely]]</tt> attributes</td>
+ <td><a href="https://wg21.link/p0479r5">P0479R5</a></td>
+ <td class="full" align="center">Clang 12</td>
</tr>
<tr>
- <td>Variable templates</td>
- <td><a href="https://wg21.link/n3651">N3651</a></td>
- <td class="full" align="center">Clang 3.4</td>
+ <td><tt>typename</tt> optional in more contexts</td>
+ <td><a href="https://wg21.link/p0634r3">P0634R3</a></td>
+ <td class="full" align="center">Clang 16</td>
</tr>
<tr>
- <td>Relaxing requirements on constexpr functions</td>
- <td><a href="https://wg21.link/n3652">N3652</a></td>
- <td class="full" align="center">Clang 3.4</td>
+ <td>Pack expansion in lambda <i>init-capture</i></td>
+ <td><a href="https://wg21.link/p0780r2">P0780R2</a></td>
+ <td class="full" align="center">Clang 9</td>
</tr>
+ <!-- Rapperswil papers -->
<tr>
- <td>Member initializers and aggregates</td>
- <td><a href="https://wg21.link/n3653">N3653</a></td>
- <td class="full" align="center">Clang 3.3</td>
+ <td rowspan="2">Class types as non-type template parameters</td>
+ <td><a href="https://wg21.link/p0732r2">P0732R2</a></td>
+ <td rowspan="2" class="partial" align="center">Partial</td>
</tr>
+ <tr> <!-- from Belfast -->
+ <td><a href="https://wg21.link/p1907r1">P1907R1</a></td>
+ </tr>
<tr>
- <td>Clarifying memory allocation</td>
- <td><a href="https://wg21.link/n3664">N3664</a></td>
- <td class="full" align="center">Clang 3.4</td>
+ <td>Destroying operator delete</td>
+ <td><a href="https://wg21.link/p0722r3">P0722R3</a></td>
+ <td class="full" align="center">Clang 6</td>
</tr>
<tr>
- <td><tt>[[deprecated]]</tt> attribute</td>
- <td><a href="https://wg21.link/n3760">N3760</a></td>
- <td class="full" align="center">Clang 3.4</td>
+ <td rowspan="7">Relaxations of <tt>constexpr</tt> restrictions</td>
+ <td><a href="https://wg21.link/p1064r0">P1064R0</a></td>
+ <td class="full" align="center">Clang 9</td>
</tr>
+ <tr> <!-- from San Diego -->
+ <td><a href="https://wg21.link/p1002r1">P1002R1</a></td>
+ <td class="full" align="center">Clang 8</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1327r1">P1327R1</a></td>
+ <td rowspan="2" class="full" align="center">Clang 9</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1330r0">P1330R0</a></td>
+ </tr>
+ <tr> <!-- from Cologne -->
+ <td><a href="https://wg21.link/p1331r2">P1331R2</a></td>
+ <td rowspan="3" class="full" align="center">Clang 10</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1668r1">P1668R1</a></td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p0784r7">P0784R7</a></td>
+ </tr>
<tr>
- <td>Single quotation mark as digit separator</td>
- <td><a href="https://wg21.link/n3781">N3781</a></td>
- <td class="full" align="center">Clang 3.4</td>
+ <td>Prohibit aggregates with user-declared constructors</td>
+ <td><a href="https://wg21.link/p1008r1">P1008R1</a></td>
+ <td class="full" align="center">Clang 8</td>
</tr>
<tr>
- <td>C++ Sized Deallocation</td>
- <td><a href="https://wg21.link/n3778">N3778</a></td>
- <td class="full" align="center">Clang 3.4 <a href="#n3778">(7)</a></td>
+ <td>Feature test macros</td>
+ <td><a href="https://wg21.link/p0941r2">P0941R2</a></td>
+ <td class="full" align="center"><a href="#sd6">(see below)</a></td>
</tr>
-</table>
-
-<p>
-<span id="n3778">(7): In Clang 3.7 and later, sized deallocation is only enabled
-if the user passes the <code>-fsized-deallocation</code> flag. The user must
-supply definitions of the sized deallocation functions, either by providing them
-explicitly or by using a C++ standard library that does. <code>libstdc++</code>
-added these functions in version 5.0, and <code>libc++</code> added them in
-version 3.7.
-</span>
-</p>
-</details>
-
+ <tr>
+ <td><tt>explicit(bool)</tt></td>
+ <td><a href="https://wg21.link/p0892r2">P0892R2</a></td>
+ <td class="full" align="center">Clang 9</td>
+ </tr>
+ <!-- San Diego papers -->
+ <tr>
+ <td>Signed integers are two's complement</td>
+ <td><a href="https://wg21.link/p1236r1">P1236R1</a></td>
+ <td class="full" align="center">Clang 9</td>
+ </tr>
+ <tr>
+ <td><tt>char8_t</tt></td>
+ <td><a href="https://wg21.link/p0482r6">P0482R6</a></td>
+ <td class="full" align="center">Clang 7 <a href="#p0482">(11)</a></td>
+ </tr>
+ <tr>
+ <td rowspan=2>Immediate functions (<tt>consteval</tt>)</td>
+ <td><a href="https://wg21.link/p1073r3">P1073R3</a></td>
+ <td class="partial" align="center">
+ <details><summary>Clang 15 (Partial)</summary>
+ Clang still incorrectly defers some consteval executions to runtime,
+ resulting in CodeGen crashes. Additionally, Clang does not properly
+ handle default arguments in consteval functions under all
+ circumstances.
+ </details>
+ </td>
+ </tr>
+ <tr> <!-- from Prague -->
+ <td><a href="https://wg21.link/p1937r2">P1937R2</a></td>
+ <td class="full" align="center">Clang 14</td>
+ </tr>
+ <tr>
+ <td><tt>std::is_constant_evaluated</tt></td>
+ <td><a href="https://wg21.link/p0595r2">P0595R2</a></td>
+ <td class="full" align="center">Clang 9</td>
+ </tr>
+ <tr>
+ <td>Nested inline namespaces</td>
+ <td><a href="https://wg21.link/p1094r2">P1094R2</a></td>
+ <td class="full" align="center">Clang 8</td>
+ </tr>
+ <!-- Kona 2019 papers -->
+ <tr>
+ <td rowspan="2">Structured binding extensions</td>
+ <td><a href="https://wg21.link/p1091r3">P1091R3</a></td>
+ <td rowspan="2" class="full" align="center">Clang 16</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1381r1">P1381R1</a></td>
+ </tr>
+ <tr>
+ <td rowspan="2">Stronger Unicode requirements</td>
+ <td><a href="https://wg21.link/p1041r4">P1041R4</a></td>
+ <td rowspan="2" class="full" align="center">Yes</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1139r2">P1139R2</a></td>
+ </tr>
+ <tr>
+ <td rowspan="2">Parenthesized initialization of aggregates</td>
+ <td><a href="https://wg21.link/p0960r3">P0960R3</a></td>
+ <td rowspan="2" class="none" align="center">No</td>
+ </tr>
+ <tr> <!-- from Belfast -->
+ <td><a href="https://wg21.link/p1975r0">P1975R0</a></td>
+ </tr>
+ <tr>
+ <td rowspan="12">Modules</td>
+ <td><a href="https://wg21.link/p1103r3">P1103R3</a></td>
+ <td class="full" align="center">Clang 15</td>
+ </tr>
+ <tr> <!-- from Cologne -->
+ <td><a href="https://wg21.link/p1766r1">P1766R1</a> (<a href="#dr">DR</a>)</td>
+ <td class="full" align="center">Clang 11</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1811r0">P1811R0</a></td>
+ <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1703r1">P1703R1</a></td>
+ <td class="none" align="center">Subsumed by P1857</td>
+ </tr>
+ <tr> <!-- from Belfast -->
+ <td><a href="https://wg21.link/p1874r1">P1874R1</a></td>
+ <td class="full" align="center">Clang 15</td>
+ </tr>
+ <tr> <!-- from Belfast -->
+ <td><a href="https://wg21.link/p1979r0">P1979R0</a></td>
+ <td class="none" align="center">No</td>
+ </tr>
+ <tr> <!-- from Prague -->
+ <td><a href="https://wg21.link/p1779r3">P1779R3</a></td>
+ <td class="full" align="center">Clang 15</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1857r3">P1857R3</a></td>
+ <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p2115r0">P2115R0</a></td>
+ <td class="partial" align="center">Partial</td>
+ </tr>
+ <tr>
+ <td><a href="https://wg21.link/p1815r2">P1815R2</a></td>
+ <td class="partial" align="center">Partial</td>
+ </tr>
+ <tr> <!-- from Kona 2022 -->
+ <td><a href="https://wg21.link/P2615R1">P2615R1</a> (<a href="#dr">DR</a>)</td>
+ <td class="none" align="center">No</td>
+ </tr>
+ <tr> <!-- from Issaquah 2023 -->
+ <td><a href="https://wg21.link/P2788R0">P2788R0</a> (<a href="#dr">DR</a>)</td>
+ <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+ <td>Coroutines</td>
+ <td><a href="https://wg21.link/p0912r5">P0912R5</a></td>
+ <td class="partial" align="center">
+ <details><summary>Partial</summary>
+ Fully supported on all targets except Windows, which
+ still has some stability and ABI issues.
+ </details></td>
+ </tr>
+ <!-- Cologne 2019 papers -->
+ <tr>
+ <td>Deprecate <tt>a[b,c]</tt></td>
+ <td><a href="https://wg21.link/p1161r3">P1161R3</a></td>
+ <td class="full" align="center">Clang 9</td>
+ </tr>
+ <tr>
+ <td>Deprecate some problematic uses of <tt>volatile</tt></td>
+ <td><a href="https://wg21.link/p1152r4">P1152R4</a></td>
+ <td class="full" align="center">Clang 10</td>
+ </tr>
+ <tr>
+ <td><tt>[[nodiscard("with reason")]]</tt></td>
+ <td><a href="https://wg21.link/p1301r4">P1301R4</a></td>
+ <td class="full" align="center">Clang 9</td>
+ </tr>
+ <tr>
+ <td><tt>using enum</tt></td>
+ <td><a href="https://wg21.link/p1099r5">P1099R5</a></td>
+ <td class="full" align="center">Clang 13</td>
+ </tr>
+ <tr>
+ <td rowspan=2>Class template argument deduction for aggregates</td>
+ <td><a href="https://wg21.link/p1816r0">P1816R0</a></td>
+ <td rowspan=2 class="none" align="center">No</td>
+ </tr>
+ <tr> <!-- from Prague -->
+ <td><a href="https://wg21.link/p2082r1">P2082R1</a></td>
+ </tr>
+ <tr>
+ <td>Class template argument deduction for alias templates</td>
+ <td><a href="https://wg21.link/p1814r0">P1814R0</a></td>
+ <td class="none" align="center">No</td>
+ </tr>
+ <tr>
+ <td>Permit conversions to arrays of unknown bound</td>
+ <td><a href="https://wg21.link/p0388r4">P0388R4</a></td>
+ <td class="full" align="center">Clang 14</td>
+ </tr>
+ <tr>
+ <td><tt>constinit</tt></td>
+ <td><a href="https://wg21.link/p1143r2">P1143R2</a></td>
+ <td class="full" align="center">Clang 10</td>
+ </tr>
+ <!-- Prague 2019 papers -->
+ <tr>
+ <td>Pseudo-destructors end object lifetimes</td>
+ <td><a href="https://wg21.link/p0593r6">P0593R6</a> (<a href="#dr">DR</a>)</td>
+ <td class="full" align="center">Clang 11</td>
+ </tr>
+ <tr>
+ <td>More implicit moves</td>
+ <td><a href="https://wg21.link/p1825r0">P1825R0</a> (<a href="#dr">DR</a>)</td>
+ <td class="full" align="center">Clang 13</td>
+ </tr>
+</table>
+
+<p>
+<span id="p0482">(11): Prior to Clang 8, this feature is not enabled by
+<tt>-std=c++20</tt>, but can be enabled with <tt>-fchar8_t</tt>.
+</span>
+</p>
+</details>
+
+
<h2 id="cxx17">C++17 implementation status</h2>
<p>Clang 5 and later implement all the features of the
@@ -858,731 +1080,513 @@ <h2 id="cxx17">C++17 implementation status</h2>
</p>
</details>
-<h2 id="cxx20">C++20 implementation status</h2>
+<h2 id="cxx14">C++14 implementation status</h2>
-<p>Clang has support for some of the features of the
-<a href="https://www.iso.org/standard/79358.html">ISO C++ 2020 standard</a>.</p>
+<p>Clang 3.4 and later implement all of the <a
+ href="https://www.iso.org/standard/64029.html">ISO
+ C++ 2014 standard</a>.</p>
-<p>You can use Clang in C++20 mode with the <code>-std=c++20</code> option
-(use <code>-std=c++2a</code> in Clang 9 and earlier).</p>
+<p>You can use Clang in C++14 mode with the <code>-std=c++14</code> option
+(use <code>-std=c++1y</code> in Clang 3.4 and earlier).</p>
-<details open>
+<details>
<summary>List of features and minimum Clang version with support</summary>
<table width="689" border="1" cellspacing="0">
<tr>
<th>Language Feature</th>
- <th>C++20 Proposal</th>
+ <th>C++14 Proposal</th>
<th>Available in Clang?</th>
</tr>
- <!-- Toronto 2017 papers -->
<tr>
- <td>Default member initializers for bit-fields</td>
- <td><a href="https://wg21.link/p0683r1">P0683R1</a></td>
- <td class="full" align="center">Clang 6</td>
+ <td>Tweak to certain C++ contextual conversions</td>
+ <td><a href="https://wg21.link/n3323">N3323</a></td>
+ <td class="full" align="center">Clang 3.4</td>
</tr>
<tr>
- <td><tt>const&</tt>-qualified pointers to members</td>
- <td><a href="https://wg21.link/p0704r1">P0704R1</a></td>
- <td class="full" align="center">Clang 6</td>
+ <td>Binary literals</td>
+ <td><a href="https://wg21.link/n3472">N3472</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Allow <i>lambda-capture</i> <tt>[=, this]</tt></td>
- <td><a href="https://wg21.link/p0409r2">P0409R2</a></td>
- <td class="full" align="center">Clang 6</td>
+ <td>decltype(auto)</td>
+ <td rowspan=2 style="vertical-align:middle"><a href="https://wg21.link/n3638">N3638</a></td>
+ <td class="full" align="center">Clang 3.3</td>
</tr>
<tr>
- <td rowspan="2"><tt>__VA_OPT__</tt> for preprocessor comma elision</td>
- <td><a href="https://wg21.link/p0306r4">P0306R4</a></td>
- <td class="full" align="center">Clang 6</td>
+ <td>Return type deduction for normal functions</td>
+ <td class="full" align="center">Clang 3.4</td>
</tr>
- <tr> <!-- from Rapperswil -->
- <td><a href="https://wg21.link/p1042r1">P1042R1</a></td>
- <td class="full" align="center">Clang 9</td>
- </tr>
<tr>
- <td>Designated initializers</td>
- <td><a href="https://wg21.link/p0329r4">P0329R4</a></td>
- <td class="full" align="center">Clang 10</td>
+ <td>Initialized lambda captures</td>
+ <td><a href="https://wg21.link/n3648">N3648</a></td>
+ <td class="full" align="center">Clang 3.4</td>
</tr>
<tr>
- <td><i>template-parameter-list</i> for generic lambdas</td>
- <td><a href="https://wg21.link/p0428r2">P0428R2</a></td>
- <td class="full" align="center">Clang 9</td>
+ <td>Generic lambdas</td>
+ <td><a href="https://wg21.link/n3649">N3649</a></td>
+ <td class="full" align="center">Clang 3.4</td>
</tr>
- <tr id="p0734">
- <td rowspan="13">Concepts</td>
- <td><a href="https://wg21.link/p0734r0">P0734R0</a></td>
- <td class="full" align="center">Clang 10</td>
- </tr>
- <tr> <!-- from Albuquerque -->
- <td><a href="https://wg21.link/p0857r0">P0857R0</a></td>
- <td rowspan="1" class="full" align="center">Clang 16</td>
- </tr>
- <tr> <!-- from San Diego -->
- <td><a href="https://wg21.link/p1084r2">P1084R2</a></td>
- <td rowspan="2" class="full" align="center">Clang 10</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1141r2">P1141R2</a></td>
- </tr>
- <tr> <!-- from Cologne -->
- <td><a href="https://wg21.link/p0848r3">P0848R3</a></td>
- <td rowspan="1" class="partial" align="center">
- <details>
- <summary>Clang 16 (Partial)</summary>
- Because of other concepts implementation deficits, the __cpp_concepts macro is not yet set to 202002L.
- Also, the related defect reports <a href="https://wg21.link/cwg1496">DR1496</a> and
- <a href="https://wg21.link/cwg1734">DR1734</a> are not yet implemented. Accordingly, deleted
- special member functions are treated as eligible even though they shouldn't be.
- </details>
- </td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1616r1">P1616R1</a></td>
- <td rowspan="2" class="full" align="center">Clang 10</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1452r2">P1452R2</a></td>
- </tr>
- <tr> <!-- from Belfast -->
- <td><a href="https://wg21.link/p1972r0">P1972R0</a></td>
- <td rowspan="4" class="full" align="center">Clang 10</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1980r0">P1980R0</a></td>
- </tr>
- <tr> <!-- from Prague -->
- <td><a href="https://wg21.link/p2103r0">P2103R0</a></td>
- </tr>
- <tr> <!-- from February 2022 -->
- <td><a href="https://wg21.link/p2493r0">P2493R0</a></td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p2092r0">P2092R0</a></td>
- <td rowspan="1" class="full" align="center">Clang 16</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p2113r0">P2113R0</a></td>
- <td rowspan="1" class="full" align="center">Clang 16</td>
- </tr>
- <!-- Albuquerque papers -->
- <tr>
- <td>Range-based for statements with initializer</td>
- <td><a href="https://wg21.link/p0614r1">P0614R1</a></td>
- <td class="full" align="center">Clang 8</td>
- </tr>
- <tr>
- <td>ADL and function templates that are not visible</td>
- <td><a href="https://wg21.link/p0846r0">P0846R0</a></td>
- <td class="full" align="center">Clang 9</td>
- </tr>
- <tr>
- <td><tt>const</tt> mismatch with defaulted copy constructor</td>
- <td><a href="https://wg21.link/p0641r2">P0641R2</a></td>
- <td class="full" align="center">Clang 8</td>
- </tr>
- <tr>
- <td rowspan="10">Consistent comparison (<tt>operator<=></tt>)</td>
- <td><a href="https://wg21.link/p0515r3">P0515R3</a></td>
- <td rowspan="8" class="full" align="center">Clang 10</td>
- </tr>
- <tr> <!-- from Jacksonville -->
- <td><a href="https://wg21.link/p0905r1">P0905R1</a></td>
- </tr>
- <tr> <!-- from Rapperswil -->
- <td><a href="https://wg21.link/p1120r0">P1120R0</a></td>
- </tr>
- <tr> <!-- from Kona 2019 -->
- <td><a href="https://wg21.link/p1185r2">P1185R2</a></td>
- </tr>
- <tr> <!-- from Cologne -->
- <td><a href="https://wg21.link/p1186r3">P1186R3</a></td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1630r1">P1630R1</a></td>
- </tr>
- <tr> <!-- from Belfast -->
- <td><a href="https://wg21.link/p1946r0">P1946R0</a></td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1959r0">P1959R0</a></td>
- </tr>
- <tr> <!-- from Prague -->
- <td><a href="https://wg21.link/p2002r1">P2002R1</a></td>
- <td class="partial" align="center">Partial</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p2085r0">P2085R0</a></td>
- <td class="full" align="center">Clang 14</td>
- </tr>
- <tr>
- <td>Access checking on specializations</td>
- <td><a href="https://wg21.link/p0692r1">P0692R1</a></td>
- <td class="full" align="center">Clang 14</td>
- </tr>
- <tr>
- <td>Default constructible and assignable stateless lambdas</td>
- <td><a href="https://wg21.link/p0624r2">P0624R2</a></td>
- <td class="full" align="center">Clang 8</td>
- </tr>
- <tr>
- <td>Lambdas in unevaluated contexts</td>
- <td><a href="https://wg21.link/p0315r4">P0315R4</a></td>
- <td class="full" align="center">Clang 17</td>
- </tr>
- <!-- Jacksonville papers -->
- <tr>
- <td><tt>[[no_unique_address]]</tt> attribute</td>
- <td><a href="https://wg21.link/p0840r2">P0840R2</a></td>
- <td class="full" align="center">Clang 9</td>
- </tr>
- <tr>
- <td><tt>[[likely]]</tt> and <tt>[[unlikely]]</tt> attributes</td>
- <td><a href="https://wg21.link/p0479r5">P0479R5</a></td>
- <td class="full" align="center">Clang 12</td>
- </tr>
- <tr>
- <td><tt>typename</tt> optional in more contexts</td>
- <td><a href="https://wg21.link/p0634r3">P0634R3</a></td>
- <td class="full" align="center">Clang 16</td>
- </tr>
- <tr>
- <td>Pack expansion in lambda <i>init-capture</i></td>
- <td><a href="https://wg21.link/p0780r2">P0780R2</a></td>
- <td class="full" align="center">Clang 9</td>
- </tr>
- <!-- Rapperswil papers -->
- <tr>
- <td rowspan="2">Class types as non-type template parameters</td>
- <td><a href="https://wg21.link/p0732r2">P0732R2</a></td>
- <td rowspan="2" class="partial" align="center">Partial</td>
- </tr>
- <tr> <!-- from Belfast -->
- <td><a href="https://wg21.link/p1907r1">P1907R1</a></td>
- </tr>
- <tr>
- <td>Destroying operator delete</td>
- <td><a href="https://wg21.link/p0722r3">P0722R3</a></td>
- <td class="full" align="center">Clang 6</td>
- </tr>
- <tr>
- <td rowspan="7">Relaxations of <tt>constexpr</tt> restrictions</td>
- <td><a href="https://wg21.link/p1064r0">P1064R0</a></td>
- <td class="full" align="center">Clang 9</td>
- </tr>
- <tr> <!-- from San Diego -->
- <td><a href="https://wg21.link/p1002r1">P1002R1</a></td>
- <td class="full" align="center">Clang 8</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1327r1">P1327R1</a></td>
- <td rowspan="2" class="full" align="center">Clang 9</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1330r0">P1330R0</a></td>
- </tr>
- <tr> <!-- from Cologne -->
- <td><a href="https://wg21.link/p1331r2">P1331R2</a></td>
- <td rowspan="3" class="full" align="center">Clang 10</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1668r1">P1668R1</a></td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p0784r7">P0784R7</a></td>
- </tr>
- <tr>
- <td>Prohibit aggregates with user-declared constructors</td>
- <td><a href="https://wg21.link/p1008r1">P1008R1</a></td>
- <td class="full" align="center">Clang 8</td>
- </tr>
- <tr>
- <td>Feature test macros</td>
- <td><a href="https://wg21.link/p0941r2">P0941R2</a></td>
- <td class="full" align="center"><a href="#sd6">(see below)</a></td>
+ <tr>
+ <td>Variable templates</td>
+ <td><a href="https://wg21.link/n3651">N3651</a></td>
+ <td class="full" align="center">Clang 3.4</td>
</tr>
<tr>
- <td><tt>explicit(bool)</tt></td>
- <td><a href="https://wg21.link/p0892r2">P0892R2</a></td>
- <td class="full" align="center">Clang 9</td>
- </tr>
- <!-- San Diego papers -->
- <tr>
- <td>Signed integers are two's complement</td>
- <td><a href="https://wg21.link/p1236r1">P1236R1</a></td>
- <td class="full" align="center">Clang 9</td>
- </tr>
- <tr>
- <td><tt>char8_t</tt></td>
- <td><a href="https://wg21.link/p0482r6">P0482R6</a></td>
- <td class="full" align="center">Clang 7 <a href="#p0482">(11)</a></td>
- </tr>
- <tr>
- <td rowspan=2>Immediate functions (<tt>consteval</tt>)</td>
- <td><a href="https://wg21.link/p1073r3">P1073R3</a></td>
- <td class="partial" align="center">
- <details><summary>Clang 15 (Partial)</summary>
- Clang still incorrectly defers some consteval executions to runtime,
- resulting in CodeGen crashes. Additionally, Clang does not properly
- handle default arguments in consteval functions under all
- circumstances.
- </details>
- </td>
+ <td>Relaxing requirements on constexpr functions</td>
+ <td><a href="https://wg21.link/n3652">N3652</a></td>
+ <td class="full" align="center">Clang 3.4</td>
</tr>
- <tr> <!-- from Prague -->
- <td><a href="https://wg21.link/p1937r2">P1937R2</a></td>
- <td class="full" align="center">Clang 14</td>
- </tr>
<tr>
- <td><tt>std::is_constant_evaluated</tt></td>
- <td><a href="https://wg21.link/p0595r2">P0595R2</a></td>
- <td class="full" align="center">Clang 9</td>
+ <td>Member initializers and aggregates</td>
+ <td><a href="https://wg21.link/n3653">N3653</a></td>
+ <td class="full" align="center">Clang 3.3</td>
</tr>
<tr>
- <td>Nested inline namespaces</td>
- <td><a href="https://wg21.link/p1094r2">P1094R2</a></td>
- <td class="full" align="center">Clang 8</td>
+ <td>Clarifying memory allocation</td>
+ <td><a href="https://wg21.link/n3664">N3664</a></td>
+ <td class="full" align="center">Clang 3.4</td>
</tr>
- <!-- Kona 2019 papers -->
<tr>
- <td rowspan="2">Structured binding extensions</td>
- <td><a href="https://wg21.link/p1091r3">P1091R3</a></td>
- <td rowspan="2" class="full" align="center">Clang 16</td>
+ <td><tt>[[deprecated]]</tt> attribute</td>
+ <td><a href="https://wg21.link/n3760">N3760</a></td>
+ <td class="full" align="center">Clang 3.4</td>
</tr>
- <tr>
- <td><a href="https://wg21.link/p1381r1">P1381R1</a></td>
- </tr>
<tr>
- <td rowspan="2">Stronger Unicode requirements</td>
- <td><a href="https://wg21.link/p1041r4">P1041R4</a></td>
- <td rowspan="2" class="full" align="center">Yes</td>
+ <td>Single quotation mark as digit separator</td>
+ <td><a href="https://wg21.link/n3781">N3781</a></td>
+ <td class="full" align="center">Clang 3.4</td>
</tr>
- <tr>
- <td><a href="https://wg21.link/p1139r2">P1139R2</a></td>
- </tr>
<tr>
- <td rowspan="2">Parenthesized initialization of aggregates</td>
- <td><a href="https://wg21.link/p0960r3">P0960R3</a></td>
- <td rowspan="2" class="none" align="center">No</td>
- </tr>
- <tr> <!-- from Belfast -->
- <td><a href="https://wg21.link/p1975r0">P1975R0</a></td>
- </tr>
- <tr>
- <td rowspan="12">Modules</td>
- <td><a href="https://wg21.link/p1103r3">P1103R3</a></td>
- <td class="full" align="center">Clang 15</td>
+ <td>C++ Sized Deallocation</td>
+ <td><a href="https://wg21.link/n3778">N3778</a></td>
+ <td class="full" align="center">Clang 3.4 <a href="#n3778">(7)</a></td>
</tr>
- <tr> <!-- from Cologne -->
- <td><a href="https://wg21.link/p1766r1">P1766R1</a> (<a href="#dr">DR</a>)</td>
- <td class="full" align="center">Clang 11</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1811r0">P1811R0</a></td>
- <td class="none" align="center">No</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1703r1">P1703R1</a></td>
- <td class="none" align="center">Subsumed by P1857</td>
- </tr>
- <tr> <!-- from Belfast -->
- <td><a href="https://wg21.link/p1874r1">P1874R1</a></td>
- <td class="full" align="center">Clang 15</td>
- </tr>
- <tr> <!-- from Belfast -->
- <td><a href="https://wg21.link/p1979r0">P1979R0</a></td>
- <td class="none" align="center">No</td>
- </tr>
- <tr> <!-- from Prague -->
- <td><a href="https://wg21.link/p1779r3">P1779R3</a></td>
- <td class="full" align="center">Clang 15</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1857r3">P1857R3</a></td>
- <td class="none" align="center">No</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p2115r0">P2115R0</a></td>
- <td class="partial" align="center">Partial</td>
- </tr>
- <tr>
- <td><a href="https://wg21.link/p1815r2">P1815R2</a></td>
- <td class="partial" align="center">Partial</td>
- </tr>
- <tr> <!-- from Kona 2022 -->
- <td><a href="https://wg21.link/P2615R1">P2615R1</a> (<a href="#dr">DR</a>)</td>
- <td class="none" align="center">No</td>
- </tr>
- <tr> <!-- from Issaquah 2023 -->
- <td><a href="https://wg21.link/P2788R0">P2788R0</a> (<a href="#dr">DR</a>)</td>
- <td class="none" align="center">No</td>
+</table>
+
+<p>
+<span id="n3778">(7): In Clang 3.7 and later, sized deallocation is only enabled
+if the user passes the <code>-fsized-deallocation</code> flag. The user must
+supply definitions of the sized deallocation functions, either by providing them
+explicitly or by using a C++ standard library that does. <code>libstdc++</code>
+added these functions in version 5.0, and <code>libc++</code> added them in
+version 3.7.
+</span>
+</p>
+</details>
+
+<h2 id="cxx11">C++11 implementation status</h2>
+
+<p>Clang 3.3 and later implement all of the <a
+ href="https://www.iso.org/standard/50372.html">ISO
+ C++ 2011 standard</a>.</p>
+
+<p>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="https://libcxx.llvm.org/">libc++</a> or with gcc's libstdc++.</p>
+
+<details>
+<summary>List of features and minimum Clang version with support</summary>
+
+<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 rowspan="2">Rvalue references</td>
+ <td><a href="https://wg21.link/n2118">N2118</a></td>
+ <td class="full" align="center">Clang 2.9</td>
+ <tr> <!-- from Kona 2019-->
+ <td><a href="https://wg21.link/p1825r0">P1825R0</a> (<a href="#dr">DR</a>)</td>
+ <td class="full" align="center">Clang 13</td>
</tr>
+ </tr>
<tr>
- <td>Coroutines</td>
- <td><a href="https://wg21.link/p0912r5">P0912R5</a></td>
- <td class="partial" align="center">
- <details><summary>Partial</summary>
- Fully supported on all targets except Windows, which
- still has some stability and ABI issues.
- </details></td>
+ <td> Rvalue references for <code>*this</code></td>
+ <td><a href="https://wg21.link/n2439">N2439</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
- <!-- Cologne 2019 papers -->
<tr>
- <td>Deprecate <tt>a[b,c]</tt></td>
- <td><a href="https://wg21.link/p1161r3">P1161R3</a></td>
- <td class="full" align="center">Clang 9</td>
+ <td>Initialization of class objects by rvalues</td>
+ <td><a href="https://wg21.link/n1610">N1610</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Deprecate some problematic uses of <tt>volatile</tt></td>
- <td><a href="https://wg21.link/p1152r4">P1152R4</a></td>
- <td class="full" align="center">Clang 10</td>
+ <td>Non-static data member initializers</td>
+ <td><a href="https://wg21.link/n2756">N2756</a></td>
+ <td class="full" align="center">Clang 3.0</td>
</tr>
<tr>
- <td><tt>[[nodiscard("with reason")]]</tt></td>
- <td><a href="https://wg21.link/p1301r4">P1301R4</a></td>
- <td class="full" align="center">Clang 9</td>
+ <td>Variadic templates</td>
+ <td><a href="https://wg21.link/n2242">N2242</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td><tt>using enum</tt></td>
- <td><a href="https://wg21.link/p1099r5">P1099R5</a></td>
- <td class="full" align="center">Clang 13</td>
+ <td> Extending variadic template template parameters</td>
+ <td><a href="https://wg21.link/n2555">N2555</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td rowspan=2>Class template argument deduction for aggregates</td>
- <td><a href="https://wg21.link/p1816r0">P1816R0</a></td>
- <td rowspan=2 class="none" align="center">No</td>
+ <td rowspan="3">Initializer lists</td>
+ <td><a href="https://wg21.link/n2672">N2672</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
- <tr> <!-- from Prague -->
- <td><a href="https://wg21.link/p2082r1">P2082R1</a></td>
+ <tr> <!-- from Kona 2019-->
+ <td><a href="https://wg21.link/p1009r2">P1009R2</a> (<a href="#dr">DR</a>)</td>
+ <td class="full" align="center">Clang 9</td>
+ </tr>
+ <tr> <!-- from Prague-->
+ <td><a href="https://wg21.link/p1957r2">P1957R2</a> (<a href="#dr">DR</a>)</td>
+ <td class="full" align="center">Clang 11</td>
</tr>
<tr>
- <td>Class template argument deduction for alias templates</td>
- <td><a href="https://wg21.link/p1814r0">P1814R0</a></td>
- <td class="none" align="center">No</td>
+ <td>Static assertions</td>
+ <td><a href="https://wg21.link/n1720">N1720</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Permit conversions to arrays of unknown bound</td>
- <td><a href="https://wg21.link/p0388r4">P0388R4</a></td>
- <td class="full" align="center">Clang 14</td>
+ <td><code>auto</code>-typed variables</td>
+ <td><a href="https://wg21.link/n1984">N1984</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td><tt>constinit</tt></td>
- <td><a href="https://wg21.link/p1143r2">P1143R2</a></td>
- <td class="full" align="center">Clang 10</td>
+ <td> Multi-declarator <code>auto</code></td>
+ <td><a href="https://wg21.link/n1737">N1737</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
- <!-- Prague 2019 papers -->
<tr>
- <td>Pseudo-destructors end object lifetimes</td>
- <td><a href="https://wg21.link/p0593r6">P0593R6</a> (<a href="#dr">DR</a>)</td>
- <td class="full" align="center">Clang 11</td>
+ <td> Removal of auto as a storage-class specifier</td>
+ <td><a href="https://wg21.link/n2546">N2546</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>More implicit moves</td>
- <td><a href="https://wg21.link/p1825r0">P1825R0</a> (<a href="#dr">DR</a>)</td>
- <td class="full" align="center">Clang 13</td>
+ <td> New function declarator syntax</td>
+ <td><a href="https://wg21.link/n2541">N2541</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
-</table>
-
-<p>
-<span id="p0482">(11): Prior to Clang 8, this feature is not enabled by
-<tt>-std=c++20</tt>, but can be enabled with <tt>-fchar8_t</tt>.
-</span>
-</p>
-</details>
-
-<h2 id="cxx23">C++23 implementation status</h2>
-
-<!-- TODO add link to the ISO Standard after it's published. -->
-<p>Clang has support for some of the features of the ISO C++ 2023 standard.</p>
-
-<p>You can use Clang in C++23 mode with the <code>-std=c++23</code> option.</p>
-
-<details open>
-<summary>List of features and minimum Clang version with support</summary>
-
-<table width="689" border="1" cellspacing="0">
- <tr>
- <th>Language Feature</th>
- <th>C++23 Proposal</th>
- <th>Available in Clang?</th>
- </tr>
- <!-- Fall 2020 papers -->
<tr>
- <td>Literal suffix <tt>uz</tt>, <tt>z</tt> for <tt>size_t</tt>, <tt>ssize_t</tt></td>
- <td><a href="https://wg21.link/p0330r8">P0330R8</a></td>
- <td class="full" align="center">Clang 13</td>
+ <td rowspan="2">Lambda expressions</td>
+ <td><a href="https://wg21.link/n2927">N2927</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
- <!-- Spring 2021 papers -->
+ <tr>
+ <!-- from Albuquerque 2017 -->
+ <td><a href="https://wg21.link/p0588r1">P0588R1</a> (<a href="#dr">DR</a>)</td>
+ <td class="none" align="center">No</td>
+ </tr>
<tr>
- <td>Make <tt>()</tt> in lambdas optional in all cases</td>
- <td><a href="https://wg21.link/p1102r2">P1102R2</a></td>
- <td class="full" align="center">Clang 13</td>
+ <td>Declared type of an expression</td>
+ <td><a href="https://wg21.link/n2343">N2343</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Simpler implicit move</td>
- <td><a href="https://wg21.link/p2266r1">P2266R1</a></td>
- <td class="full" align="center">Clang 13</td>
+ <td> Incomplete return types</td>
+ <td><a href="https://wg21.link/n3276">N3276</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
<tr>
- <td><tt>if consteval</tt></td>
- <td><a href="https://wg21.link/P1938R3">P1938R3</a></td>
- <td class="full" align="center">Clang 14</td>
+ <td>Right angle brackets</td>
+ <td><a href="https://wg21.link/n1757">N1757</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Allow duplicate attributes</td>
- <td><a href="https://wg21.link/P2156R1">P2156R1</a></td>
- <td class="full" align="center">Clang 13</td>
+ <td>Default template arguments for function templates</td>
+ <td><a href="https://wg21.link/cwg226">DR226</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Narrowing contextual conversions to bool</td>
- <td><a href="https://wg21.link/P1401R5">P1401R5</a></td>
- <td class="full" align="center">Clang 14</td>
+ <td>Solving the SFINAE problem for expressions</td>
+ <td><a href="https://wg21.link/n2634">DR339</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Trimming whitespaces before line splicing</td>
- <td><a href="https://wg21.link/P2223R2">P2223R2</a></td>
- <td class="full" align="center">Yes</td>
+ <td>Alias templates</td>
+ <td><a href="https://wg21.link/n2258">N2258</a></td>
+ <td class="full" align="center">Clang 3.0</td>
</tr>
<tr>
- <td>Make declaration order layout mandated</td>
- <td><a href="https://wg21.link/p1847r4">P1874R4</a></td>
- <td class="full" align="center">Yes</td>
+ <td>Extern templates</td>
+ <td><a href="https://wg21.link/n1987">N1987</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>C++ identifier syntax using UAX 31</td>
- <td><a href="https://wg21.link/P1949R7">P1949R7</a></td>
- <td class="full" align="center">Clang 14</td>
+ <td>Null pointer constant</td>
+ <td><a href="https://wg21.link/n2431">N2431</a></td>
+ <td class="full" align="center">Clang 3.0</td>
</tr>
<tr>
- <td>Mixed string literal concatenation</td>
- <td><a href="https://wg21.link/p2201r1">P2201R1</a></td>
- <td class="full" align="center">Yes</td>
+ <td>Strongly-typed enums</td>
+ <td><a href="https://wg21.link/n2347">N2347</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
- <!-- October 2021 papers -->
<tr>
- <td rowspan=2>Deducing this</td>
- <td><a href="https://wg21.link/P0847R7">P0847R7</a></td>
- <td class="none" align="center">No</td>
+ <td>Forward declarations for enums</td>
+ <td><a href="https://wg21.link/n2764">N2764</a>
+ <br><a href="https://wg21.link/cwg1206">DR1206</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
<tr>
- <td><a href="https://wg21.link/P2797R0">P2797R0</a></td>
- <td class="none" align="center">No</td>
+ <td>Standardized attribute syntax</td>
+ <td><a href="https://wg21.link/n2761">N2761</a></td>
+ <td class="full" align="center">Clang 3.3 <a href="#n2761">(1)</a></td>
</tr>
<tr>
- <td rowspan=2>Change scope of lambda trailing-return-type</td>
- <td><a href="https://wg21.link/P2036R3">P2036R3</a></td>
- <td rowspan=2 class="unreleased" align="center">Clang 17</td>
+ <td rowspan="2">Generalized constant expressions</td>
+ <td><a href="https://wg21.link/n2235">N2235</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
+ <tr>
+ <!-- from Albuquerque 2017 -->
+ <td><a href="https://wg21.link/p0859r0">P0859R0</a> (<a href="#dr">DR</a>)</td>
+ <td class="full" align="center">Clang 8</td>
+ </tr>
<tr>
- <td><a href="https://wg21.link/P2579R0">P2579R0</a></td>
+ <td>Alignment support</td>
+ <td><a href="https://wg21.link/n2341">N2341</a></td>
+ <td class="full" align="center">Clang 3.3</td>
</tr>
<tr>
- <td>Multidimensional subscript operator</td>
- <td><a href="https://wg21.link/P2128R6">P2128R6</a></td>
- <td class="full" align="center">Clang 15</td>
+ <td>Conditionally-support behavior</td>
+ <td><a href="https://wg21.link/n1627">N1627</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Non-literal variables (and labels and gotos) in constexpr functions</td>
- <td><a href="https://wg21.link/P2242R3">P2242R3</a></td>
- <td class="full" align="center">Clang 15</td>
+ <td>Changing undefined behavior into diagnosable errors</td>
+ <td><a href="https://wg21.link/n1727">N1727</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Character encoding of diagnostic text</td>
- <td><a href="https://wg21.link/P2246R1">P2246R1</a></td>
- <td class="full" align="center">Yes</td>
+ <td>Delegating constructors</td>
+ <td><a href="https://wg21.link/n1986">N1986</a></td>
+ <td class="full" align="center">Clang 3.0</td>
+ </tr>
+ <tr>
+ <td rowspan="2">Inheriting constructors</td>
+ <td><a href="https://wg21.link/n2540">N2540</a></td>
+ <td class="full" align="center">Clang 3.3</td>
+ </tr>
+ <tr>
+ <!-- from Kona 2015 -->
+ <td><a href="https://wg21.link/p0136r1">P0136R1</a> (<a href="#dr">DR</a>)</td>
+ <td class="full" align="center">Clang 3.9</td>
+ </tr>
+ <tr>
+ <td>Explicit conversion operators</td>
+ <td><a href="https://wg21.link/n2437">N2437</a></td>
+ <td class="full" align="center">Clang 3.0</td>
+ </tr>
+ <tr>
+ <td>New character types</td>
+ <td><a href="https://wg21.link/n2249">N2249</a></td>
+ <td class="full" align="center">Clang 2.9</td>
+ </tr>
+ <tr>
+ <td>Unicode string literals</td>
+ <td><a href="https://wg21.link/n2442">N2442</a></td>
+ <td class="full" align="center">Clang 3.0</td>
+ </tr>
+ <tr>
+ <td>Raw string literals</td>
+ <td><a href="https://wg21.link/n2442">N2442</a></td>
+ <td class="full" align="center">Clang 3.0</td>
</tr>
<tr>
- <td>Character sets and encodings</td>
- <td><a href="https://wg21.link/P2314R4">P2314R4</a></td>
- <td class="full" align="center">Yes</td>
+ <td>Universal character names in literals</td>
+ <td><a href="https://wg21.link/n2170">N2170</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
<tr>
- <td>Consistent character literal encoding</td>
- <td><a href="https://wg21.link/P2316R2">P2316R2</a></td>
- <td class="full" align="center">Yes</td>
+ <td>User-defined literals</td>
+ <td><a href="https://wg21.link/n2765">N2765</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
<tr>
- <td>Add support for preprocessing directives elifdef and elifndef</td>
- <td><a href="https://wg21.link/P2334R1">P2334R1</a></td>
- <td class="full" align="center">Clang 13</td>
+ <td>Standard Layout Types</td>
+ <td><a href="https://wg21.link/n2342">N2342</a></td>
+ <td class="full" align="center">Clang 3.0</td>
</tr>
<tr>
- <td>Extend init-statement to allow alias-declaration</td>
- <td><a href="https://wg21.link/P2360R0">P2360R0</a></td>
- <td class="full" align="center">Clang 14</td>
+ <td rowspan="2">Defaulted functions</td>
+ <td><a href="https://wg21.link/n2346">N2346</a></td>
+ <td class="full" align="center">Clang 3.0</td>
</tr>
+ <tr> <!-- from Kona 2019-->
+ <td><a href="https://wg21.link/p1286r2">P1286R2</a> (<a href="#dr">DR</a>)</td>
+ <td class="full" align="center">Clang 9</td>
+ </tr>
<tr>
- <td>auto(x): decay-copy in the language</td>
- <td><a href="https://wg21.link/P0849R8">P0849R8</a></td>
- <td class="full" align="center">Clang 15</td>
+ <td>Deleted functions</td>
+ <td><a href="https://wg21.link/n2346">N2346</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
- <!-- February 2022 papers -->
<tr>
- <td>Attributes on Lambda-Expressions</td>
- <td><a href="https://wg21.link/P2173R1">P2173R1</a></td>
- <td class="full" align="center">Clang 13</td>
+ <td>Extended friend declarations</td>
+ <td><a href="https://wg21.link/n1791">N1791</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td><tt>constexpr</tt> for <tt><cmath></tt> and <tt><cstdlib></tt></td>
- <td><a href="https://wg21.link/P0533R9">P0533R9</a></td>
- <td class="none" align="center">No</td>
+ <td>Extending <code>sizeof</code></td>
+ <td><a href="https://wg21.link/n2253">N2253</a>
+ <br><a href="https://wg21.link/cwg850">DR850</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
<tr>
- <td>Type trait to determine if a reference binds to a temporary</td>
- <td><a href="https://wg21.link/P2255R2">P2255R2</a></td>
- <td class="partial" align="center">
- <details><summary>Partial</summary>
- Clang provides a <tt>__reference_binds_to_temporary</tt> type trait
- builtin, with which the library facility can be partially implemented.
- Both <tt>__reference_constructs_from_temporary</tt> and
- <tt>__reference_converts_from_temporary</tt> builtins should be
- provided, following the normal cross-vendor convention to implement
- traits requiring compiler support directly.
- </details></td>
- </td>
+ <td>Inline namespaces</td>
+ <td><a href="https://wg21.link/n2535">N2535</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
- <!-- July 2022 papers -->
<tr>
- <td>The Equality Operator You Are Looking For</td>
- <td><a href="https://wg21.link/P2468R2">P2468R2</a></td>
- <td class="full" align="center">Clang 16</td>
+ <td>Unrestricted unions</td>
+ <td><a href="https://wg21.link/n2544">N2544</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
<tr>
- <td>De-deprecating volatile compound operations</td>
- <td><a href="https://wg21.link/P2327R1">P2327R1</a></td>
- <td class="full" align="center">Clang 15</td>
+ <td>Local and unnamed types as template arguments</td>
+ <td><a href="https://wg21.link/n2657">N2657</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Support for <code>#warning</code></td>
- <td><a href="https://wg21.link/P2437R1">P2437R1</a></td>
- <td class="full" align="center">Yes</td>
+ <td rowspan="2">Range-based for</td>
+ <td><a href="https://wg21.link/n2930">N2930</a></td>
+ <td class="full" align="center">Clang 3.0</td>
</tr>
+ <tr>
+ <!-- from Jacksonville 2018 -->
+ <td><a href="https://wg21.link/p0962r1">P0962R1</a> (<a href="#dr">DR</a>)</td>
+ <td class="full" align="center">Clang 8</td>
+ </tr>
<tr>
- <td>Remove non-encodable wide character literals and multicharacter wide character literals</td>
- <td><a href="https://wg21.link/P2362R3">P2362R3</a></td>
- <td class="full" align="center">Clang 14</td>
+ <td>Explicit virtual overrides</td>
+ <td><a href="https://wg21.link/n2928">N2928</a>
+ <br><a href="https://wg21.link/n3206">N3206</a>
+ <br><a href="https://wg21.link/n3272">N3272</a></td>
+ <td class="full" align="center">Clang 3.0</td>
</tr>
<tr>
- <td>Labels at the end of compound statements</td>
- <td><a href="https://wg21.link/P2324R2">P2324R2</a></td>
- <td class="full" align="center">Clang 16</td>
+ <td>Minimal support for garbage collection and reachability-based leak detection</td>
+ <td><a href="https://wg21.link/n2670">N2670</a></td>
+ <td class="na" align="center">N/A <a href="#n2670">(2)</a></td>
</tr>
<tr>
- <td>Delimited escape sequences</td>
- <td><a href="https://wg21.link/P2290R3">P2290R3</a></td>
- <td class="full" align="center">Clang 15</td>
+ <td>Allowing move constructors to throw [noexcept]</td>
+ <td><a href="https://wg21.link/n3050">N3050</a></td>
+ <td class="full" align="center">Clang 3.0</td>
</tr>
<tr>
- <td>Named universal character escapes</td>
- <td><a href="https://wg21.link/P2071R2">P2071R2</a></td>
- <td class="full" align="center">Clang 15</td>
+ <td>Defining move special member functions</td>
+ <td><a href="https://wg21.link/n3053">N3053</a></td>
+ <td class="full" align="center">Clang 3.0</td>
</tr>
- <tr>
- <td>Relaxing some constexpr restrictions</td>
- <td><a href="https://wg21.link/P2448R2">P2448R2</a></td>
- <td class="partial" align="center">
- <details><summary>Clang 17 (Partial)</summary>
- We do not support outside of defaulted special memeber functions the change that constexpr functions no
- longer have to be constexpr compatible but rather support a less restricted requirements for constexpr
- functions. Which include allowing non-literal types as return values and parameters, allow calling of
- non-constexpr functions and constructors.
- </details></td>
- </td>
+
+ <tr class="separator">
+ <th align="center" colspan="3">Concurrency</th>
</tr>
<tr>
- <td>Using unknown pointers and references in constant expressions</td>
- <td><a href="https://wg21.link/P2280R4">P2280R4</a></td>
- <td class="none" align="center">No</td>
+ <td>Sequence points</td>
+ <td><a href="https://wg21.link/n2239">N2239</a></td>
+ <td class="full" align="center">Clang 3.3</td>
</tr>
<tr>
- <td>static <code>operator()</code></td>
- <td><a href="https://wg21.link/P1169R4">P1169R4</a></td>
- <td class="full" align="center">Clang 16</td>
+ <td>Atomic operations</td>
+ <td><a href="https://wg21.link/n2427">N2427</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
<tr>
- <td>Extended floating-point types and standard names</td>
- <td><a href="https://wg21.link/P1467R9">P1467R9</a></td>
- <td class="none" align="center">No</td>
+ <td>Strong Compare and Exchange</td>
+ <td><a href="https://wg21.link/n2748">N2748</a></td>
+ <td class="full" align="center">Clang 3.1 <a href="#n2748">(3)</a></td>
</tr>
<tr>
- <td>Class template argument deduction from inherited constructors</td>
- <td><a href="https://wg21.link/P2582R1">P2582R1</a></td>
- <td class="none" align="center">No</td>
+ <td>Bidirectional Fences</td>
+ <td><a href="https://wg21.link/n2752">N2752</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
+
<tr>
- <td>Portable assumptions</td>
- <td><a href="https://wg21.link/P1774R8">P1774R8</a></td>
- <td class="none" align="center">No</td>
+ <td>Memory model</td>
+ <td><a href="https://wg21.link/n2429">N2429</a></td>
+ <td class="full" align="center">Clang 3.2</td>
</tr>
<tr>
- <td>Support for UTF-8 as a portable source file encoding</td>
- <td><a href="https://wg21.link/P2295R6">P2295R6</a></td>
- <td class="full" align="center">Clang 15</td>
+ <td>Data-dependency ordering: atomics and memory model</td>
+ <td><a href="https://wg21.link/n2664">N2664</a></td>
+ <td class="full" align="center">Clang 3.2 <a href="#n2664">(4)</a></td>
</tr>
<tr>
- <td><code>char8_t</code> Compatibility and Portability Fix</td>
- <td><a href="https://wg21.link/P2513R3">P2513R3</a></td>
- <td class="full" align="center">Clang 16</td>
+ <td>Propagating exceptions</td>
+ <td><a href="https://wg21.link/n2179">N2179</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Relax requirements on <code>wchar_t</code> to match existing practices</td>
- <td><a href="https://wg21.link/P2460R2">P2460R2</a></td>
- <td class="full" align="center">Yes</td>
+ <td>Allow atomics use in signal handlers</td>
+ <td><a href="https://wg21.link/n2547">N2547</a></td>
+ <td class="full" align="center">Clang 3.1</td>
</tr>
<tr>
- <td>Explicit lifetime management</td>
- <td><a href="https://wg21.link/P2590R2">P2590R2</a></td>
- <td class="none" align="center">No</td>
+ <td>Thread-local storage</td>
+ <td><a href="https://wg21.link/n2659">N2659</a></td>
+ <td class="full" align="center">Clang 3.3 <a href="#n2659">(5)</a></td>
</tr>
- <!-- November 2022 (Kona) papers -->
<tr>
- <td>static <code>operator[]</code></td>
- <td><a href="https://wg21.link/P2589R1">P2589R1</a></td>
- <td class="full" align="center">Clang 16</td>
+ <td>Dynamic initialization and destruction with concurrency</td>
+ <td><a href="https://wg21.link/n2660">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>Permitting static constexpr variables in constexpr functions</td>
- <td><a href="https://wg21.link/P2647R1">P2647R1</a></td>
- <td class="full" align="center">Clang 16</td>
+ <td><code>__func__</code> predefined identifier</td>
+ <td><a href="https://wg21.link/n2340">N2340</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>consteval needs to propagate up</td>
- <td><a href="https://wg21.link/P2564R3">P2564R3</a> (<a href="#dr">DR</a>)</td>
- <td class="none" align="center">No</td>
+ <td>C99 preprocessor</td>
+ <td><a href="https://wg21.link/n1653">N1653</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
<tr>
- <td>Lifetime extension in range-based for loops</td>
- <td><a href="https://wg21.link/P2718R0">P2718R0</a></td>
- <td class="none" align="center">No</td>
+ <td><code>long long</code></td>
+ <td><a href="https://wg21.link/n1811">N1811</a></td>
+ <td class="full" align="center">Clang 2.9</td>
</tr>
- <!--Issaquah 2023 papers-->
<tr>
- <td>Referencing The Unicode Standard</td>
- <td><a href="https://wg21.link/P2736R2">P2736R2</a></td>
- <td class="full" align="center">Yes</td>
+ <td>Extended integral types</td>
+ <td><a href="https://wg21.link/n1988">N1988</a></td>
+ <td class="na" align="center">N/A <a href="#n1988">(6)</a></td>
</tr>
</table>
-</details>
-<h2 id="cxx26">C++2c implementation status</h2>
+<p>
+<span id="n2761">(1): The <code>[[carries_dependency]]</code> attribute
+has no effect.</span><br>
+<span id="n2670">(2): No compiler changes are required for an implementation
+such as Clang that does not provide garbage collection.</span><br>
+<span id="n2748">(3): All compare-exchange operations are emitted as
+strong compare-exchanges.</span><br>
+<span id="n2664">(4): <code>memory_order_consume</code> is lowered to
+<code>memory_order_acquire</code>.</span><br>
+<span id="n2659">(5): <code>thread_local</code> support
+requires a C++ runtime library providing <code>__cxa_thread_atexit</code>, such
+as <a href="https://libcxxabi.llvm.org">libc++abi</a> 3.6 or later,
+or libsupc++ 4.8 or later.</span><br>
+<span id="n1988">(6): No compiler changes are required for an implementation
+such as Clang that does not provide any extended integer types.
+<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>
+</details>
-<!-- TODO add link to the ISO Standard after it's published. -->
-<p>Clang has support for some of the features of the C++ standard following
-C++23, informally referred to as C++26.</p>
-<p>You can use Clang in C++2c mode with the <code>-std=c++2c</code> option.</p>
+<h2 id="cxx98">C++98 implementation status</h2>
-<details open>
-<summary>List of features and minimum Clang version with support</summary>
-<table width="689" border="1" cellspacing="0">
- <tr>
- <th>Language Feature</th>
- <th>C++26 Proposal</th>
- <th>Available in Clang?</th>
- </tr>
- </table>
- </details>
+<p>Clang implements all of the ISO C++ 1998 standard
+ (including the defects addressed in the ISO C++ 2003 standard)
+ except for <tt>export</tt> (which was removed in C++11).
<h2 id="dr">Defect reports</h2>
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