[gcc r9-9357] libstdc++: Document when C++11/14/17 support became stable [PR 99058]

[Jonathan Wakely]

https://gcc.gnu.org/g:2ede3f69d27e082cbba69b77e9807b06e3ad1730

commit r9-9357-g2ede3f69d27e082cbba69b77e9807b06e3ad1730
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Feb 11 15:35:23 2021 +0000

    libstdc++: Document when C++11/14/17 support became stable [PR 99058]
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/99058
            * doc/xml/manual/status_cxx2011.xml: Document when support
            became stable.
            * doc/xml/manual/status_cxx2014.xml: Likewise.
            * doc/xml/manual/status_cxx2017.xml: Likewise.
            * doc/html/manual/status.html: Regenerate.
    
    (cherry picked from commit ce43c906049b828c0472d8499b52ac6233c869d0)

Diff:
---
 libstdc++-v3/doc/html/manual/status.html       | 9 +++++++++
 libstdc++-v3/doc/xml/manual/status_cxx2011.xml | 3 +++
 libstdc++-v3/doc/xml/manual/status_cxx2014.xml | 3 +++
 libstdc++-v3/doc/xml/manual/status_cxx2017.xml | 3 +++
 4 files changed, 18 insertions(+)

diff --git a/libstdc++-v3/doc/html/manual/status.html b/libstdc++-v3/doc/html/manual/status.html
index 26793d9fa83..e303f570e87 100644
--- a/libstdc++-v3/doc/html/manual/status.html
+++ b/libstdc++-v3/doc/html/manual/status.html
@@ -153,6 +153,9 @@ features. See <a class="link" href="using.html#manual.intro.using.flags" title="
 options. The pre-defined symbol
 <code class="constant">__cplusplus</code> is used to check for the
 presence of the required flag.
+GCC 5.1 was the first release with non-experimental C++11 support,
+so the API and ABI of features added in C++11 is only stable
+since that release.
 </p><p>
 This status table is based on the table of contents of ISO/IEC 14882:2011.
 </p><p>
@@ -387,6 +390,9 @@ features. See <a class="link" href="using.html#manual.intro.using.flags" title="
 options. The pre-defined symbol
 <code class="constant">__cplusplus</code> is used to check for the
 presence of the required flag.
+GCC 6.1 was the first release with non-experimental C++14 support,
+so the API and ABI of features added in C++14 is only stable
+since that release.
 </p><p>
 This status table is based on the table of contents of ISO/IEC 14882:2014.
 Some subclauses are not shown in the table where the content is unchanged
@@ -514,6 +520,9 @@ features. See <a class="link" href="using.html#manual.intro.using.flags" title="
 options. The pre-defined symbol
 <code class="constant">__cplusplus</code> is used to check for the
 presence of the required flag.
+GCC 9.1 was the first release with non-experimental C++17 support,
+so the API and ABI of features added in C++17 is only stable
+since that release.
 </p><p>
 This section describes the C++17 and library TS support in the GCC 9 series.
 </p><p>
diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2011.xml b/libstdc++-v3/doc/xml/manual/status_cxx2011.xml
index 431eb02bb6b..e737232d48d 100644
--- a/libstdc++-v3/doc/xml/manual/status_cxx2011.xml
+++ b/libstdc++-v3/doc/xml/manual/status_cxx2011.xml
@@ -24,6 +24,9 @@ features. See <link linkend="manual.intro.using.flags">dialect</link>
 options. The pre-defined symbol
 <constant>__cplusplus</constant> is used to check for the
 presence of the required flag.
+GCC 5.1 was the first release with non-experimental C++11 support,
+so the API and ABI of features added in C++11 is only stable
+since that release.
 </para>
 
 <para>
diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2014.xml b/libstdc++-v3/doc/xml/manual/status_cxx2014.xml
index f0872f6f8d0..156e0120250 100644
--- a/libstdc++-v3/doc/xml/manual/status_cxx2014.xml
+++ b/libstdc++-v3/doc/xml/manual/status_cxx2014.xml
@@ -17,6 +17,9 @@ features. See <link linkend="manual.intro.using.flags">dialect</link>
 options. The pre-defined symbol
 <constant>__cplusplus</constant> is used to check for the
 presence of the required flag.
+GCC 6.1 was the first release with non-experimental C++14 support,
+so the API and ABI of features added in C++14 is only stable
+since that release.
 </para>
 
 <para>
diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2017.xml b/libstdc++-v3/doc/xml/manual/status_cxx2017.xml
index 898b029e66b..2910021a899 100644
--- a/libstdc++-v3/doc/xml/manual/status_cxx2017.xml
+++ b/libstdc++-v3/doc/xml/manual/status_cxx2017.xml
@@ -17,6 +17,9 @@ features. See <link linkend="manual.intro.using.flags">dialect</link>
 options. The pre-defined symbol
 <constant>__cplusplus</constant> is used to check for the
 presence of the required flag.
+GCC 9.1 was the first release with non-experimental C++17 support,
+so the API and ABI of features added in C++17 is only stable
+since that release.
 </para>
 
 <para>