From 5f939178ec1e667d2a05bed96a9078cc926eba9d Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Thu, 30 Nov 2017 13:45:37 +0000
Subject: [PATCH] PR libstdc++/83226 avoid forming pointer-to-reference type

	PR libstdc++/83226
	* include/bits/node_handle.h (_Node_handle::__pointer): Avoid forming
	pointer-to-reference types.
	* testsuite/23_containers/map/modifiers/insert/83226.cc: New test.

From-SVN: r255271
---
 libstdc++-v3/ChangeLog                        |  7 +++++
 libstdc++-v3/include/bits/node_handle.h       |  4 ++-
 .../map/modifiers/insert/83226.cc             | 30 +++++++++++++++++++
 3 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 libstdc++-v3/testsuite/23_containers/map/modifiers/insert/83226.cc

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 55f194731af..a79a28488a3 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,10 @@
+2017-11-30  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/83226
+	* include/bits/node_handle.h (_Node_handle::__pointer): Avoid forming
+	pointer-to-reference types.
+	* testsuite/23_containers/map/modifiers/insert/83226.cc: New test.
+
 2017-11-29  John David Anglin  <danglin@gcc.gnu.org>
 
 	* config/abi/post/hppa-linux-gnu/baseline_symbols.txt: Update.
diff --git a/libstdc++-v3/include/bits/node_handle.h b/libstdc++-v3/include/bits/node_handle.h
index 0d8dbeb4110..7f109ada6f1 100644
--- a/libstdc++-v3/include/bits/node_handle.h
+++ b/libstdc++-v3/include/bits/node_handle.h
@@ -199,7 +199,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       }
 
       template<typename _Tp>
-	using __pointer = __ptr_rebind<typename _AllocTraits::pointer, _Tp>;
+	using __pointer
+	  = __ptr_rebind<typename _AllocTraits::pointer,
+			 remove_reference_t<_Tp>>;
 
       __pointer<_Key>				_M_pkey = nullptr;
       __pointer<typename _Value::second_type>	_M_pmapped = nullptr;
diff --git a/libstdc++-v3/testsuite/23_containers/map/modifiers/insert/83226.cc b/libstdc++-v3/testsuite/23_containers/map/modifiers/insert/83226.cc
new file mode 100644
index 00000000000..07afa5cbd87
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/map/modifiers/insert/83226.cc
@@ -0,0 +1,30 @@
+// Copyright (C) 2017 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++17" }
+// { dg-do compile { target c++17 } }
+
+#include <map>
+
+void
+test01()
+{
+  int i = 0;
+  std::map<int, int&> m;
+  std::pair<const int, int&> p{1, i};
+  m.insert(p); // PR libstdc++/83226
+}
-- 
2.30.2