gcc-wwwdocs branch master updated. d1abca5195cfd15aad393ae35fe899f53a86ebb2

gcc-wwwdocs branch master updated. d1abca5195cfd15aad393ae35fe899f53a86ebb2

[Jonathan Wakely]

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- Log -----------------------------------------------------------------
commit d1abca5195cfd15aad393ae35fe899f53a86ebb2
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Apr 28 13:47:12 2023 +0100

    Add caveat about C++ iostream init changes (PR108969)
    
    Co-authored-by: Andrew Pinski <apinski@marvell.com>

diff --git a/htdocs/gcc-13/changes.html b/htdocs/gcc-13/changes.html
index 3d4870bd..bd022ed2 100644
--- a/htdocs/gcc-13/changes.html
+++ b/htdocs/gcc-13/changes.html
@@ -56,6 +56,18 @@ You may also want to check out our
       <a href="https://gcc.gnu.org/onlinedocs/gcc-13.1.0/gcc/ARM-iWMMXt-Built-in-Functions.html">
       iWMMXt built-in functions</a>.
     </li>
+    <li>For C++, construction of the global iostream objects
+      <code>std::cout</code>, <code>std::cin</code>, etc. is now done
+      inside the standard library, instead of in every source file that
+      includes the <code>&lt;iostream&gt;</code> header. This change
+      improves the start-up performance of C++ programs, but it means that
+      code compiled with GCC 13.1 will crash if the correct version of
+      <code>libstdc++.so</code> is not used at runtime. See the
+      <a href="https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dynamic_or_shared.html#manual.intro.using.linkage.dynamic">documentation</a>
+      about using the right <code>libstdc++.so</code> at runtime.
+      Future GCC releases will mitigate the problem so that the program
+      cannot be run at all with an older <code>libstdc++.so</code>.
+    </li>
 </ul>
 
 

commit a09e584729c3136719d8870ad0c26870de8a552f
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Mar 22 10:36:37 2023 +0000

    Clarify experimental status of C++17 prior to GCC 9
    
    Also link to library docs for C++20 and add a cxx2a anchor which is used
    by some old links.

diff --git a/htdocs/projects/cxx-status.html b/htdocs/projects/cxx-status.html
index b5362bba..7f59e5a2 100644
--- a/htdocs/projects/cxx-status.html
+++ b/htdocs/projects/cxx-status.html
@@ -402,10 +402,12 @@
     -->
   </table>
 
-  <h2 id="cxx20">C++20 Support in GCC</h2>
+  <h2 id="cxx20"><a id="cxx2a">C++20 Support in GCC</h2>
 
   <p>GCC has experimental support for the latest revision of the C++
-  standard, which was published in 2020.</p>
+  standard, which was published in 2020.
+  The status of C++20 library features is described in
+  <a href="https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2020">the library documentation</a>.</p>
 
   <p>C++20 features are available since GCC 8. To enable C++20
       support, add the command-line parameter <code>-std=c++20</code>
@@ -988,14 +990,16 @@
 
   <p>GCC has almost full support for the previous revision of the C++
   standard, which was published in 2017.
-  Some library features are missing or incomplete, as described in
+  The status of C++17 library features is described in
   <a href="https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2017">the library documentation</a>.
   </p>
 
-  <p>C++17 features are available since GCC 5.  This mode is the default
-  in GCC 11; it can be explicitly selected with the <code>-std=c++17</code>
-  command-line flag, or <code>-std=gnu++17</code> to enable GNU extensions
-  as well.</p>
+  <p>C++17 mode is the default since GCC 11; it can be explicitly selected
+  with the <code>-std=c++17</code> command-line flag, or
+  <code>-std=gnu++17</code> to enable GNU extensions as well.
+  Some C++17 features are available since GCC 5, but support was experimental
+  and the ABI of C++17 features was not stable until GCC 9.
+  </p>
 
   <h2>C++17 Language Features</h2>
 
@@ -1315,7 +1319,7 @@
 
   <p>GCC has full support for the of the 2014 C++ standard.</p>
 
-  <p>This mode is the default in GCC 6.1 up until GCC 10 (including); it can
+  <p>This mode is the default in GCC 6.1 up until GCC 10 (inclusive); it can
   be explicitly selected with the <code>-std=c++14</code> command-line flag,
   or <code>-std=gnu++14</code> to enable GNU extensions as well.</p>
 

-----------------------------------------------------------------------

Summary of changes:
 htdocs/gcc-13/changes.html      | 12 ++++++++++++
 htdocs/projects/cxx-status.html | 20 ++++++++++++--------
 2 files changed, 24 insertions(+), 8 deletions(-)


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