Document C++20 library status

diff --git a/libstdc++-v3/doc/xml/manual/intro.xml b/libstdc++-v3/doc/xml/manual/intro.xml
index 7159b592c9f..28210cb0862 100644
--- a/libstdc++-v3/doc/xml/manual/intro.xml
+++ b/libstdc++-v3/doc/xml/manual/intro.xml
@@ -43,6 +43,10 @@ 
     <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="xml" href="status_cxx2017.xml">
     </xi:include>
 
+    <!-- Section 01.4 : Status C++ 2020 -->
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="xml" href="status_cxx2020.xml">
+    </xi:include>
+
     <!-- Section 01.5 : Status C++ TR1 -->
     <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="xml" href="status_cxxtr1.xml">
     </xi:include>
diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2017.xml b/libstdc++-v3/doc/xml/manual/status_cxx2017.xml
index f3793083375..0af8a02b00f 100644
--- a/libstdc++-v3/doc/xml/manual/status_cxx2017.xml
+++ b/libstdc++-v3/doc/xml/manual/status_cxx2017.xml
@@ -980,6 +980,14 @@  and test for <code>__STDCPP_MATH_SPEC_FUNCS__ >= 201003L</code>.
       documents behaviour which is new in the 2017 standard.
    </para>
 
+   <para>
+      <emphasis>20.5.1.2 [headers]</emphasis>
+      Whether names from Annex K are declared by C++ headers depends on
+      whether the underlying C library supports Annex K and declares the
+      names. For the GNU C library, there is no Annex K support and so
+      none of its names are declared by C++ headers.
+   </para>
+
    <para>
       <emphasis>23.6.5 [optional.bad_optional_access]</emphasis>
       <code>what()</code> returns <literal>"bad optional access"</literal>.
@@ -987,8 +995,7 @@  and test for <code>__STDCPP_MATH_SPEC_FUNCS__ >= 201003L</code>.
 
    <para>
       <emphasis>23.7.3 [variant.variant]</emphasis>
-      Whether <classname>variant</classname> supports over-aligned types
-      should be documented here.
+      <classname>variant</classname> supports over-aligned types.
    </para>
 
    <para>
@@ -998,15 +1005,21 @@  and test for <code>__STDCPP_MATH_SPEC_FUNCS__ >= 201003L</code>.
 
    <para>
       <emphasis>23.12.5.2 [memory.resource.pool.options]</emphasis>
-      The limits for maximum number of blocks and largest allocation size
-      supported by <classname>pool_options</classname> should be documented
-      here.
+      Let S equal <code>numeric_limits&lt;size_t&gt;::digits</code>.
+      The limit for maximum number of blocks in a chunk is given by
+      <inlineequation><mathphrase>2<superscript>N</superscript>-1</mathphrase></inlineequation>,
+      where N is <inlineequation><mathphrase>min(19, 3 + S/2)</mathphrase></inlineequation>.
+      The largest allocation size that will be allocated from a pool is
+      <inlineequation><mathphrase>2<superscript>22</superscript></mathphrase></inlineequation>
+      when <inlineequation><mathphrase>S > 20</mathphrase></inlineequation>,
+      otherwise 3072 when <inlineequation><mathphrase>S > 16</mathphrase></inlineequation>,
+      otherwise 768.
    </para>
 
    <para>
       <emphasis>23.12.6.1 [memory.resource.monotonic.buffer.ctor]</emphasis>
-      The default <code>next_buffer_size</code> and growth factor should
-      be documented here.
+      The default <code>next_buffer_size</code> is <code>128 * sizeof(void*)</code>.
+      The default growth factor is <code>1.5</code>.
    </para>
 
    <para>
@@ -1067,13 +1080,32 @@  and test for <code>__STDCPP_MATH_SPEC_FUNCS__ >= 201003L</code>.
 
    <para>
       <emphasis>30.10.5 [fs.filesystem.syn]</emphasis>
-      The clock used for file times is
-      <classname>std::chrono::system_clock</classname>.
+      The clock used for file times is an unspecified type
+      with a signed 64-bit representation, capable of representing
+      timestamps with nanosecond resolution. The clock's epoch is
+      unspecified, but is not the same as the system clock's epoch.
    </para>
 
    <para>
       <emphasis>30.10.7.1 [fs.path.generic]</emphasis>
       dot-dot in the root-directory refers to the root-directory itself.
+      On Windows, a drive specifier such as <code>"C:"</code> or
+      <code>"z:"</code> is treated as a root-name. On Cygwin, a path
+      that begins with two successive directory separators is a
+      root-name. Otherwise (for POSIX-like systems other than Cygwin),
+      the implementation-defined root-name is an unspecified string
+      which does not appear in any pathnames.
+   </para>
+
+   <para>
+      <emphasis>30.10.10.1 [fs.enum.path.format]</emphasis>
+      The character sequence is always interpreted in the native pathname
+      format.
+   </para>
+
+   <para>
+      <emphasis>30.10.15.4 [fs.op.file_size]</emphasis>
+      If <code>!is_regular_file(p)</code>, an error is reported.
    </para>
 
 
diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2020.xml b/libstdc++-v3/doc/xml/manual/status_cxx2020.xml
new file mode 100644
index 00000000000..67353850ce5
--- /dev/null
+++ b/libstdc++-v3/doc/xml/manual/status_cxx2020.xml
@@ -0,0 +1,980 @@ 
+<section xmlns="http://docbook.org/ns/docbook" version="5.0" 
+	 xml:id="status.iso.2020" xreflabel="Status C++ 2020">
+<?dbhtml filename="status_iso_cxx2020.html"?>
+
+<info><title>C++ 202a</title>
+  <keywordset>
+    <keyword>ISO C++</keyword>
+    <keyword>2020</keyword>
+  </keywordset>
+</info>
+
+<para>
+In this implementation the <literal>-std=gnu++2a</literal> or
+<literal>-std=c++2a</literal> flag must be used to enable language
+and library
+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.
+</para>
+
+<para>
+This section describes the C++20 and library TS support in mainline GCC SVN,
+not in any particular release.
+</para>
+
+<para>
+The following table lists new library features that have been accepted into
+the C++2a working draft. The "Proposal" column provides a link to the
+ISO C++ committee proposal that describes the feature, while the "Status"
+column indicates the first version of GCC that contains an implementation of
+this feature (if it has been implemented).
+The "SD-6 Feature Test" column shows the corresponding macro or header from
+<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">SD-6:
+Feature-testing recommendations for C++</link>.
+</para>
+
+<table frame="all" xml:id="table.cxx20_status">
+<title>C++ 2020 Implementation Status</title>
+
+<tgroup cols="4" align="left" colsep="0" rowsep="1">
+<colspec colname="c1"/>
+<colspec colname="c2"/>
+<colspec colname="c3"/>
+<colspec colname="c4"/>
+  <thead>
+    <row>
+      <entry>Library Feature</entry>
+      <entry>Proposal</entry>
+      <entry>Status</entry>
+      <entry>SD-6 Feature Test</entry>
+    </row>
+  </thead>
+
+  <tbody>
+
+    <row>
+      <entry>  Endian just Endian </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0463r1.html">
+	P0463R1
+	</link>
+      </entry>
+      <entry align="center"> 8.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Extending <code>make_shared</code> to Support Arrays </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0674r1.html">
+	P0674R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Floating Point Atomic </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0020r6.html">
+	P0020R6
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  C++ Synchronized Buffered Ostream </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0053r7.pdf">
+	P0053R7
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Add constexpr modifiers to functions in <code>&lt;algorithm&gt;</code> and <code>&lt;utility&gt;</code> Headers </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0202r3.html">
+	P0202R3
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  Constexpr for <code>std::complex</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0415r1.html">
+	P0415R1
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Make <code>std::memory_order</code> a scoped enumeration </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0439r0.html">
+	P0439R0
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  String Prefix and Suffix Checking </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0457r2.html">
+	P0457R2
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  Transformation Trait <code>remove_cvref</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0550r2.pdf">
+	P0550R2
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  <code>nodiscard</code> in the Library </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0600r1.pdf">
+	P0600R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  de-pessimize legacy algorithms with <code>std::move</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0616r0.pdf">
+	P0616R0
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  Utility to convert a pointer to a raw pointer </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0653r2.html">
+	P0653R2
+	</link>
+      </entry>
+      <entry align="center"> 8.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Atomic <code>shared_ptr</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0718r2.html">
+	P0718R2
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Deprecate POD </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0767r1.html">
+	P0767R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Library Support for the Spaceship (Comparison) Operator </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0768r1.pdf">
+	P0768R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Treating Unnecessary <code>decay</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0777r1.pdf">
+	P0777R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  <code>&lt;span&gt;</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0122r7.pdf">
+	P0122R7
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Extending chrono to Calendars and Time Zones </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0355r7.html">
+	P0355R7
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Thou Shalt Not Specialize std Function Templates! </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0551r3.pdf">
+	P0551R3
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Manipulators for C++ Synchronized Buffered Ostream </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0753r2.pdf">
+	P0753R2
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  <code>&lt;version&gt;</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0754r2.pdf">
+	P0754R2
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Comparing Unordered Containers </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0809r0.pdf">
+	P0809R0
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Constexpr iterator requirements </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0858r0.html">
+	P0858R0
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Symmetry for spaceship </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0905r1.html">
+	P0905R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  <code>string::reserve</code> Should Not Shrink </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0966r1.html">
+	P0966R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Atomic Ref </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0019r8.html">
+	P0019R8
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  Checking for Existence of an Element in Associative Containers </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0458r2.html">
+	P0458R2
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  LWG 2511: guaranteed copy elision for piecewise construction </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0475r1.html">
+	P0475R1
+	</link>
+      </entry>
+      <entry align="center"> 7.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Bit-casting object representations </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0476r2.html">
+	P0476R2
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  The Curious Case of Padding Bits, Featuring Atomic Compare-and-Exchange </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0528r3.html">
+	P0528R3
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Support for contract based programming in C++ </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0542r5.html">
+	P0542R5
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  Integral power-of-2 operations </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0556r3.html">
+	P0556R3
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Reviewing Deprecated Facilities of C++17 for C++20 </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0619r4.html">
+	P0619R4
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  Improving the Return Value of Erase-Like Algorithms </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0646r1.pdf">
+	P0646R1
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry> <code>__cpp_lib_list_remove_return_type &gt;= 201806L</code> </entry>
+    </row>
+
+    <row>
+      <entry>  Efficient sized delete for variable sized classes </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0722r3.html">
+	P0722R3
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry> <code>__cpp_lib_destroying_delete &gt;= 201806L</code> </entry>
+    </row>
+
+    <row>
+      <entry>  Implicit conversion traits and utility functions </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0758r1.html">
+	P0758R1
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  <code>fpos</code> Requirements </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0759r1.html">
+	P0759R1
+	</link>
+      </entry>
+      <entry align="center"> Note 1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Add <code>shift</code> to <code>&lt;algorithm&gt;</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0769r2.pdf">
+	P0769R2
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Standard Library Specification in a Concepts and Contracts World </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0788r3.pdf">
+	P0788R3
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Constexpr for <code>swap</code> and swap related functions </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0879r0.html">
+	P0879R0
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  The <code>identity</code> metafunction </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0887r1.pdf">
+	P0887R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  <code>explicit(bool)</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0892r2.html">
+	P0892R2
+	</link>
+      </entry>
+      <entry align="center"> Note 1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Standard Library Concepts </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0898r3.pdf">
+	P0898R3
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  Eradicating unnecessarily explicit default constructors from the standard library </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0935r0.html">
+	P0935R0
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  Integrating feature-test macros into the C++ WD </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0941r2.html">
+	P0941R2
+	</link>
+      </entry>
+      <entry align="center"> 5.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  <code>constexpr</code> comparison operators for <code>std::array</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1023r0.pdf">
+	P1023R0
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Update The Reference To The Unicode Standard </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1025r1.html">
+	P1025R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Consistency improvements for <code>&lt;=&gt;</code> and other comparison operators </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1120r0.html">
+	P1120R0
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  <code>unwrap_ref_decay</code> and <code>unwrap_reference</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0318r1.pdf">
+	P0318R1
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Simplified partial function application </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0356r5.html">
+	P0356R5
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  <code>reference_wrapper</code> for incomplete types </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0357r3.html">
+	P0357R3
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  <code>char8_t</code>: A type for UTF-8 characters and strings </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0482r6.html">
+	P0482R6
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Fixing <code>operator&gt;&gt;(basic_istream&amp;, CharT*)</code> (LWG 2499) </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0487r1.html">
+	P0487R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Utility functions to implement uses-allocator construction </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0591r4.pdf">
+	P0591R4
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  P0595R2 <code>std::is_constant_evaluated()</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0595r2.html">
+	P0595R2
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  <code>variant</code> and <code>optional</code> should propagate copy/move triviality </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0602r4.html">
+	P0602R4
+	</link>
+      </entry>
+      <entry align="center"> 8.3 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  A sane <code>variant</code> converting constructor </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0608r3.html">
+	P0608R3
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  <code>visit&lt;R&gt;</code>: Explicit Return Type for <code>visit</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0655r1.pdf">
+	P0655R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  <code>std::function</code> move constructor should be <code>noexcept</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0771r1.pdf">
+	P0771R1
+	</link>
+      </entry>
+      <entry align="center"> 7.2 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  The One Ranges Proposal </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0896r4.pdf">
+	P0896R4
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  P0899R1 - LWG 3016 is not a defect </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0899r1.html">
+	P0899R1
+	</link>
+      </entry>
+      <entry align="center"> 7.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Heterogeneous lookup for unordered containers </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0919r3.html">
+	P0919R3
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  <code>&lt;chrono&gt;</code> <code>zero()</code>, <code>min()</code>, and <code>max()</code> should be <code>noexcept</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0972r0.pdf">
+	P0972R0
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Constexpr in <code>std::pointer_traits</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1006r1.pdf">
+	P1006R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  <code>std::assume_aligned</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1007r3.pdf">
+	P1007R3
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Smart pointer creation with default initialization </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1020r1.html">
+	P1020R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Misc constexpr bits </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1032r1.html">
+	P1032R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Should Span be Regular? </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1085r2.md">
+	P1085R2
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Editorial Guidance for merging P0019r8 and P0528r3 </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1123r0.html">
+	P1123R0
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Cleaning up Clause 20 </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1148r0.pdf">
+	P1148R0
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Make stateful allocator propagation more consistent for <code>operator+(basic_string)</code> </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1165r1.html">
+	P1165R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <entry>  Adopt Consistent Container Erasure from Library Fundamentals 2 for C++20 </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1209r0.html">
+	P1209R0
+	</link>
+      </entry>
+      <entry align="center"> 9.1 </entry>
+      <entry> <code>__cpp_lib_erase_if &gt;= 201811L</code> </entry>
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Completing the Rebase of Library Fundamentals, Version 3, Working Draft </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1210r0.html">
+	P1210R0
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Alternative Wording for P0907R4 Signed Integers are Two's Complement </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1236r1.html">
+	P1236R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Remove CommonReference requirement from StrictWeakOrdering (a.k.a Fixing Relations) </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1248r1.html">
+	P1248R1
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#C8B0B0" ?>
+      <entry>  Improving Completeness Requirements for Type Traits </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1285r0.pdf">
+	P1285R0
+	</link>
+      </entry>
+      <entry align="center"> </entry>
+      <entry />
+    </row>
+
+    <row>
+      <?dbhtml bgcolor="#B0B0B0" ?>
+      <entry>  Missing feature test macros </entry>
+      <entry>
+        <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1353r0.html">
+	P1353R0
+	</link>
+      </entry>
+      <entry align="center"> Partial </entry>
+      <entry />
+    </row>
+  </tbody>
+</tgroup>
+</table>
+
+<para>
+Note 1: The changes in the proposal either do not affect the code in libstdc++,
+or the changes are not required for conformance.
+</para>
+
+
+<section xml:id="iso.2020.specific" xreflabel="Implementation Specific"><info><title>Implementation Specific Behavior</title></info>
+
+   <para>For behaviour which is also specified by previous standards,
+      see <link linkend="iso.1998.specific">C++ 1998/2003 Implementation
+      Specific Behavior</link>, <link linkend="iso.2011.specific">C++
+      2011 Implementation Specific Behavior</link> and <link
+      linkend="iso.2017.specific">C++ 2017 Implementation Specific
+      Behavior</link>.
+      This section only documents behaviour which is new in the 202a draft.
+   </para>
+
+
+</section>
+
+</section>