[PATCH, libstdc++] Doc changes for constexpr additions for C++20 status.

[Ed Smith-Rowland via libstdc++]

Here is a patch to the libstdc++ docs re constexpr additions. They 
reflect the latest macro assignments AFAICT.

Constexpr interator reqs are implemented in 9.1, the rest for 10.1.

Ok?

Should I bother adding the Constexpr interator requirements to the gcc-9 
branch docs?

Ed


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--- doc/html/manual/status.html	(revision 275426)
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@@ -597,7 +597,7 @@
 	P0220R1
 	</a>
       </td><td align="center"> 7.1 </td><td align="left"> <code class="code">__has_include(<string_view>)</code>,
-              <code class="code">__cpp_lib_string_view >= 201603</code>
+              <code class="code">__cpp_lib_string_view >= 201803</code>
               (since 7.3, see Note 1)
       </td></tr><tr><td align="left"> Library Fundamentals V1 TS Components: <code class="code">memory_resource</code> </td><td align="left">
 	<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0220r1.html" target="_top">
@@ -778,7 +778,7 @@
 	<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0031r0.html" target="_top">
 	P0031R0
 	</a>
-      </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_array_constexpr >= 201603 </code></td></tr><tr bgcolor="#B0B0B0"><td align="left"> The Parallelism TS Should be Standardized	 </td><td align="left">
+      </td><td align="center"> 7.1 </td><td align="left"><code class="code"> __cpp_lib_array_constexpr >= 201803 </code></td></tr><tr bgcolor="#B0B0B0"><td align="left"> The Parallelism TS Should be Standardized	 </td><td align="left">
 	<a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0024r2.html" target="_top">
 	P0024R2
 	</a>
@@ -1571,4 +1571,4 @@
    </p></div></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="intro.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="intro.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="license.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Part I. 
   Introduction
   
- </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> License</td></tr></table></div></body></html>
\ No newline at end of file
+ </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> License</td></tr></table></div></body></html>
Index: doc/xml/manual/status_cxx2020.xml
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--- doc/xml/manual/status_cxx2020.xml	(revision 275426)
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@@ -101,7 +101,6 @@
     </row>
 
     <row>
-      <?dbhtml bgcolor="#C8B0B0" ?>
       <entry>  Add constexpr modifiers to functions in <code><algorithm></code> and <code><utility></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">
@@ -108,8 +107,8 @@
 	P0202R3
 	</link>
       </entry>
-      <entry align="center"> </entry>
-      <entry />
+      <entry align="center"> 10.1 </entry>
+      <entry> <code>__cpp_lib_constexpr_algorithms >= 201703L</code> </entry>
     </row>
 
     <row>
@@ -307,7 +306,6 @@
     </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">
@@ -314,8 +312,9 @@
 	P0858R0
 	</link>
       </entry>
-      <entry align="center"> </entry>
-      <entry />
+      <entry align="center"> 9.1 </entry>
+      <entry> <code>__cpp_lib_string_view >= 201803L</code>
+      and <code>__cpp_lib_array_constexpr >= 201803L</code> </entry>
     </row>
 
     <row>
@@ -503,7 +502,6 @@
     </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">
@@ -510,8 +508,8 @@
 	P0879R0
 	</link>
       </entry>
-      <entry align="center"> </entry>
-      <entry />
+      <entry align="center"> 10.1 </entry>
+      <entry> <code>__cpp_lib_constexpr_algorithms >= 201806L</code> </entry>
     </row>
 
     <row>
@@ -571,7 +569,6 @@
     </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">
@@ -578,7 +575,7 @@
 	P1023R0
 	</link>
       </entry>
-      <entry align="center"> </entry>
+      <entry align="center"> 10.1 </entry>
       <entry />
     </row>