commit 24151c175c08222c268d9c37cc8fa255e2b2384c
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Apr 28 17:59:50 2021 +0100

    Document deprecation of non-standard std::pair constructors for GCC 12

diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html
index e0ac986e..912fc59b 100644
--- a/htdocs/gcc-12/changes.html
+++ b/htdocs/gcc-12/changes.html
@@ -30,6 +30,13 @@ a work-in-progress.</p>
 <!-- .................................................................. -->
 <h2>Caveats</h2>
 <ul>
+  <li>
+    Two non-standard <tt>std::pair</tt> constructors have been deprecated.
+    These allowed the use of an rvalue and a literal <tt>0</tt> to construct
+    a pair containing a move-only type and a pointer. The <tt>nullptr</tt>
+    keyword should be used to initialize the pointer member instead of a
+    literal <tt>0</tt>, as this is portable to other C++ implementations.
+  </li>
   <li>...</li>
 </ul>