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commit 15044ad13dee7627d8d235de1c502143828c4538
Author: Marek Polacek <[email protected]>
Date: Tue Jun 16 15:08:48 2026 -0400
Add C++29 Brno papers
diff --git a/htdocs/projects/cxx-status.html b/htdocs/projects/cxx-status.html
index cb3b6cfb..48b7c6e0 100644
--- a/htdocs/projects/cxx-status.html
+++ b/htdocs/projects/cxx-status.html
@@ -21,6 +21,7 @@
<li><a href="#cxx20">C++20</a></li>
<li><a href="#cxx23">C++23</a></li>
<li><a href="#cxx26">C++26</a></li>
+ <li><a href="#cxx29">C++29</a></li>
<li><a href="#tses">Technical Specifications</a></li>
</ul>
@@ -33,6 +34,144 @@
Implementation Status</a> section of the Libstdc++ manual.
</p>
+ <h2 id="cxx29">C++29 Support in GCC</h2>
+ <p>GCC has experimental support for the next revision of the C++
+ standard, which is expected to be published in 2029.</p>
+
+ <p>C++29 features are available since GCC 17. To enable C++29
+ support, add the command-line parameter <code>-std=c++29</code>
+ to your <code>g++</code> command line. Or, to enable GNU
+ extensions in addition to C++29 features,
+ add <code>-std=gnu++29</code>.</p>
+
+ <p><strong>Important</strong>: Because the ISO C++29 standard is still
+ evolving, GCC's support is <strong>experimental</strong>. No attempt will
+ be made to maintain backward compatibility with implementations of C++29
+ features that do not reflect the final standard.</p>
+
+ <h2>C++29 Language Features</h2>
+
+ <table class="cxxstatus">
+ <tr class="separator">
+ <th>Language Feature</th>
+ <th>Proposal</th>
+ <th>Available in GCC?</th>
+ <th>SD-6 Feature Test</th>
+ </tr>
+ <!-- Spring 2026 papers (Brno) -->
+ <tr>
+ <td>Clarify the behavior of floating-point overflow</td>
+ <td><a href="https://wg21.link/P3899R3";>P3899R3</a> (<a
href="./cxx-dr-status.html">DR</a>)</td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125824";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Defaulting postfix increment and decrement operations</td>
+ <td><a href="https://wg21.link/P3668R4";>P3668R4</a></td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125825";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Adding restrictions to defaulted assignment operator functions</td>
+ <td><a href="https://wg21.link/P2953R5";>P2953R5</a></td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125826";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Nondeterministic pointer provenance</td>
+ <td><a href="https://wg21.link/P2434R5";>P2434R5</a> (<a
href="./cxx-dr-status.html">DR</a>)</td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125827";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Invalid pointer operations</td>
+ <td><a href="https://wg21.link/P3347R6";>P3347R6</a> (<a
href="./cxx-dr-status.html">DR</a>)</td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125828";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Adjust identifier following new Unicode recommendations</td>
+ <td><a href="https://wg21.link/P3658R1";>P3658R1</a> (<a
href="./cxx-dr-status.html">DR</a>)</td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125829";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td><code>return_value</code> & <code>return_void</code> are not
mutually exclusive</td>
+ <td><a href="https://wg21.link/P3950R1";>P3950R1</a> (<a
href="./cxx-dr-status.html">DR</a>)</td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125830";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>More named universal character escapes</td>
+ <td><a href="https://wg21.link/P3733R1";>P3733R1</a> (<a
href="./cxx-dr-status.html">DR</a>)</td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125831";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Lexical order for lambdas</td>
+ <td><a href="https://wg21.link/P3847R1";>P3847R1</a> (<a
href="./cxx-dr-status.html">DR</a>)</td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125832";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Language linkage for templates</td>
+ <td><a href="https://wg21.link/P2243R0";>P2243R0</a> (<a
href="./cxx-dr-status.html">DR</a>)</td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125823";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Deallocation functions with throwing exception specification are
ill-formed</td>
+ <td><a href="https://wg21.link/P3424R2";>P3424R2</a></td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125833";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Conditional noexcept specifiers in compound requirements</td>
+ <td><a href="https://wg21.link/P3822R2";>P3822R2</a></td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125822";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Contracts for C++: virtual functions</td>
+ <td><a href="https://wg21.link/P3097R3";>P3097R3</a></td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125834";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Consteval-only values for C++26</td>
+ <td><a href="https://wg21.link/P4101R1";>P4101R1</a> (<a
href="./cxx-dr-status.html">DR</a>)</td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125820";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Pointer lifetime-end zap proposed solutions</td>
+ <td><a href="https://wg21.link/P2414R12";>P2414R12</a> (<a
href="./cxx-dr-status.html">DR</a>)</td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125835";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>Pack indexing for template names</td>
+ <td><a href="https://wg21.link/P3670R4";>P3670R4</a></td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125836";>No</a></td>
+ <td></td>
+ </tr>
+ <tr>
+ <td><code>#embed</code> offset parameter</td>
+ <td><a href="https://wg21.link/P3540R3";>P3540R3</a></td>
+ <td class="unsupported"> <a
href="https://gcc.gnu.org/PR125837";>No</a></td>
+ <td></td>
+ </tr>
+ <!--
+ <tr>
+ <td> </td>
+ <td> <a href="https://wg21.link/p";></a></td>
+ <td class="unsupported"> <a href="https://gcc.gnu.org/PR";>No</a></td>
+ <td> </td>
+ </tr>
+ -->
+ </table>
+
+
<h2 id="cxx26">C++26 Support in GCC</h2>
<p>GCC has experimental support for the next revision of the C++
-----------------------------------------------------------------------
Summary of changes:
htdocs/projects/cxx-status.html | 139 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 139 insertions(+)
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