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commit 4ce2216a28350a90ad8b196bf77cd6283bb5f2bc
Author: Jonathan Wakely <[email protected]>
Date: Mon Apr 27 16:25:01 2026 +0100
Add some more C++26 library features
diff --git a/htdocs/gcc-16/changes.html b/htdocs/gcc-16/changes.html
index 3104164c..b1085206 100644
--- a/htdocs/gcc-16/changes.html
+++ b/htdocs/gcc-16/changes.html
@@ -352,11 +352,14 @@ struct Affected : E
<li>
<code>ranges::starts_with</code> and <code>ranges::ends_with</code>.
</li>
+ <li><code>std::allocator_traits::allocate_at_least</code>.</li>
</ul>
</li>
<li>Improved experimental support for C++26, including:
<ul>
+ <li><code>std::simd</code>.</li>
<li><code>std::inplace_vector</code>.</li>
+ <li><code>std::optional<T&></code>.</li>
<li>
<code>std::copyable_function</code> and <code>std::function_ref</code>.
</li>
@@ -374,6 +377,8 @@ struct Affected : E
<code>std::constant_wrapper</code>, and <code>std::submdspan</code>
thanks to Luc Grosheintz.
</li>
+ <li><code>std::philox_engine</code>, thanks to 1nfocalypse.</li>
+ <li><code>std::atomic_ref::address()</code>, thanks to Yuao Ma.</li>
</ul>
</li>
</ul>
commit d995bd72a855bd57345abad1047e46649a27ee94
Author: Jonathan Wakely <[email protected]>
Date: Fri Apr 17 22:12:43 2026 +0100
Document change to -std=gnu++20 and non-experimental C++20 support
diff --git a/htdocs/gcc-16/changes.html b/htdocs/gcc-16/changes.html
index 85940731..3104164c 100644
--- a/htdocs/gcc-16/changes.html
+++ b/htdocs/gcc-16/changes.html
@@ -202,6 +202,16 @@ for general information.</p>
<h3 id="cxx">C++</h3>
<ul>
+ <li>C++20 by default: GCC 16 changes the default language version
+ for C++ compilation from
+ <a
href="https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu++17</a>
+ to
+ <a
href="https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=gnu++20</a>.
+ If your code relies on older versions of the C++ standard, you will need to
+ either add
+ <a
href="https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-std-1";>-std=</a>
+ to your build flags, or port your code; see <a
href="porting_to.html#cxx23">the porting notes</a>.
+ </li>
<li>Several C++26 features have been implemented:
<ul>
<li><a href="https://wg21.link/P2996R13";>P2996R13</a>, Reflection
@@ -293,8 +303,11 @@ struct Affected : E
C++17 mode.
</li>
- <li>Improved experimental support for C++20, including:
+ <li>Improved support for C++20, including:
<ul>
+ <li>
+ The C++20 implementation is no longer experimental.
+ </li>
<li>
Working <code>std::chrono::current_zone()</code> on Windows
(thanks to Björn Schäpers).
@@ -329,9 +342,9 @@ struct Affected : E
Representation of some range adaptors in <code><ranges></code>.
</li>
</ul>
- This list is not necessarily complete. As with all experimental support,
- programs using C++20 components should assume that those components
- are not compatible between different major releases.
+ This list is not necessarily complete. As C++20 support was experimental
+ before GCC 16, programs using C++20 components should assume that those
+ components are not compatible with older releases.
</li>
<li>Improved experimental support for C++23, including:
<ul>
-----------------------------------------------------------------------
Summary of changes:
htdocs/gcc-16/changes.html | 26 ++++++++++++++++++++++----
1 file changed, 22 insertions(+), 4 deletions(-)
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