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.

4 files changed, 18 insertions, 0 deletions

diff --git a/libstdc++-v3/doc/html/manual/status.html b/libstdc++-v3/doc/html/manual/status.html
index cea0e50..daa74a8 100644
--- a/libstdc++-v3/doc/html/manual/status.html
+++ b/libstdc++-v3/doc/html/manual/status.html
@@ -154,6 +154,9 @@ 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>
@@ -409,6 +412,9 @@ 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
@@ -538,6 +544,9 @@ 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 mainline GCC,
 not in any particular release.
diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2011.xml b/libstdc++-v3/doc/xml/manual/status_cxx2011.xml
index be87396..88844f8 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 61bea5a..2cf5f62 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 aa34b8c..b1c12bd 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>