[PATCH] Add missing piece of P0777R1 and update C++20 status docs

[Jonathan Wakely]

        * doc/xml/manual/status_cxx2020.xml: Update P0608R3, P0777R1, and
        P1165R1 entries.
        * doc/html/*: Regenerate.
        * include/std/tuple (make_from_tuple): Use remove_reference_t instead
        of decay_t (P0777R1).

Tested powerpc64le-linux, committed to trunk.



commit 867e57fbf824520973453cfa9e08c3a9ee3a5df8
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Fri May 17 00:29:22 2019 +0100

    Add missing piece of P0777R1 and update C++20 status docs
    
            * doc/xml/manual/status_cxx2020.xml: Update P0608R3, P0777R1, and
            P1165R1 entries.
            * doc/html/*: Regenerate.
            * include/std/tuple (make_from_tuple): Use remove_reference_t 
instead
            of decay_t (P0777R1).

diff --git a/libstdc++-v3/doc/xml/manual/status_cxx2020.xml 
b/libstdc++-v3/doc/xml/manual/status_cxx2020.xml
index 5cdd2227ae0..c7a543f85d9 100644
--- a/libstdc++-v3/doc/xml/manual/status_cxx2020.xml
+++ b/libstdc++-v3/doc/xml/manual/status_cxx2020.xml
@@ -227,14 +227,13 @@ Feature-testing recommendations for C++</link>.
     </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 align="center"> 9.1 </entry>
       <entry />
     </row>
 
@@ -702,14 +701,13 @@ Feature-testing recommendations for C++</link>.
     </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 align="center"> 10.1 </entry>
       <entry />
     </row>
 
@@ -863,14 +861,13 @@ Feature-testing recommendations for C++</link>.
     </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 align="center"> 10.1 </entry>
       <entry />
     </row>
 
diff --git a/libstdc++-v3/include/std/tuple b/libstdc++-v3/include/std/tuple
index a28111749f0..b81157c097b 100644
--- a/libstdc++-v3/include/std/tuple
+++ b/libstdc++-v3/include/std/tuple
@@ -1756,7 +1756,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
       return __make_from_tuple_impl<_Tp>(
         std::forward<_Tuple>(__t),
-       make_index_sequence<tuple_size_v<decay_t<_Tuple>>>{});
+       make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>{});
     }
 #endif // C++17