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commit db42fb3104933ab6dd0bf0e46cef99c5d151f135
Author: Jonathan Wakely <[email protected]>
Date: Thu Sep 25 10:20:02 2025 +0100
Document libstdc++ changes in GCC 16
- std::is_integral<__int128> is true now.
- Several ABI changes to C++20 features.
- New C++23 and C++26 features.
Also reordered C++23 changes to come before C++26 changes.
diff --git a/htdocs/gcc-16/changes.html b/htdocs/gcc-16/changes.html
index 8a7b6ae9..2cfe3d1b 100644
--- a/htdocs/gcc-16/changes.html
+++ b/htdocs/gcc-16/changes.html
@@ -91,8 +91,65 @@ for general information.</p>
<h4 id="libstdcxx">Runtime Library (libstdc++)</h4>
<ul>
+ <li>
+ For targets that support
+ <a href="https://gcc.gnu.org/onlinedocs/gcc/_005f_005fint128.html";>128-bit
+ integers</a>, <code>std::is_integral<__int128></code> and similar
+ traits are always true. Previously this was only the case when compiling
+ with GNU dialects (<code>-std=gnu++17</code>, <code>-std=gnu++14</code>,
+ etc.) and not with strict dialects (<code>-std=c++17</code>, etc.)
+ </li>
+ <li>Improved experimental support for C++20, including:
+ <ul>
+ <li>
+ Working <code>std::chrono::current_zone()</code> on Windows
+ (thanks to Björn Schäpers).
+ </li>
+ </ul>
+ </li>
+
+ <li>
+ There are several changes to C++20 components which are incompatible with
+ the experimental C++20 support in previous releases. The following C++20
+ components have ABI changes in GCC 16 include the following:
+ <ul>
+ <li>
+ Atomic waiting/notifying functions in <code><atomic></code> and
+ semaphore types in <code><semaphore></code>.
+ Synchronization for <code><syncstream></code>.
+ </li>
+ <li>
+ The representation of <code>std::format</code> args and
+ <code>std::formatter</code> specializations.
+ </li>
+ <li>
+ The representation of the <code>std::partial_ordering</code> type in
+ <code><compare></code>.
+ </li>
+ <li>
+ Semantics of <code>std::variant</code> with <code>std::jthread</code>,
+ <code>std::stop_token</code>, and <code>std::stop_source</code>
+ alternatives.
+ </li>
+ <li>
+ 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.
+ </li>
+ <li>Improved experimental support for C++23, including:
+ <ul>
+ <li><code>std::mdspan</code>, thanks to Luc Grosheintz.</li>
+ <li>
+ <code>ranges::starts_with</code> and <code>ranges::ends_with</code>.
+ </li>
+ </ul>
+ </li>
<li>Improved experimental support for C++26, including:
<ul>
+ <li><code>std::inplace_vector</code>.</li>
<li>
<code>std::copyable_function</code> and <code>std::function_ref</code>.
</li>
@@ -100,11 +157,15 @@ for general information.</p>
<li>
<code>std::owner_equal</code> for shared pointers, thanks to Paul Keir.
</li>
- </ul>
- </li>
- <li>Improved experimental support for C++23, including:
- <ul>
- <li><code>std::mdspan</code>, thanks to Luc Grosheintz.</li>
+ <li><code><debugging></code> header and contents.</li>
+ <li>New <code>std::stringstream</code> and <code>std::bitset</code>
+ member functions accepting <code>std::string_view</code> arguments,
+ thanks to Nathan Myers.
+ </li>
+ <li>
+ Padded mdspan layouts, aligned accessor, and <code>std::dims</code>,
+ thanks to Luc Grosheintz.
+ </li>
</ul>
</li>
</ul>
commit 1cc0cc2bc4d34fd66ced2557792500026c74905f
Author: Jonathan Wakely <[email protected]>
Date: Wed Sep 17 11:18:13 2025 +0100
Minor grammar fix for GCC 15 release notes
diff --git a/htdocs/gcc-15/changes.html b/htdocs/gcc-15/changes.html
index 07a04762..79fccaef 100644
--- a/htdocs/gcc-15/changes.html
+++ b/htdocs/gcc-15/changes.html
@@ -44,7 +44,7 @@ You may also want to check out our
union member to zero. If initialization of the whole union including
padding bits is desirable, use <code>{}</code> (valid in C23 or C++)
or use <code>-fzero-init-padding-bits=unions</code> option to restore
- old GCC behavior.</li>
+ the old GCC behavior.</li>
<li><a
href="https://gcc.gnu.org/onlinedocs/gcc/Static-Analyzer-Options.html";><code>-fanalyzer</code></a>
is still only suitable for analyzing C code.
In particular, using it on C++ is unlikely to give meaningful output.
-----------------------------------------------------------------------
Summary of changes:
htdocs/gcc-15/changes.html | 2 +-
htdocs/gcc-16/changes.html | 71 ++++++++++++++++++++++++++++++++++++++++++----
2 files changed, 67 insertions(+), 6 deletions(-)
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