From bfe8a528aa35b66146fa7bac8ea0c1a5bc48bb70 Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Fri, 16 Jun 2017 14:23:42 +0100
Subject: [PATCH] Fix std::wbuffer_convert::sync()

	* include/bits/locale_conv.h (wbuffer_convert::sync): Fix condition.
	* testsuite/22_locale/conversions/buffer/2.cc: New.

From-SVN: r249255
---
 libstdc++-v3/ChangeLog                        |  3 ++
 libstdc++-v3/include/bits/locale_conv.h       |  2 +-
 .../22_locale/conversions/buffer/2.cc         | 39 +++++++++++++++++++
 3 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 libstdc++-v3/testsuite/22_locale/conversions/buffer/2.cc

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index bcf1d049a29..f04fc0aef26 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,8 @@
 2017-06-16  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/bits/locale_conv.h (wbuffer_convert::sync): Fix condition.
+	* testsuite/22_locale/conversions/buffer/2.cc: New.
+
 	PR libstdc++/81092
 	* acinclude.m4: Bump libtool_VERSION.
 	* config/abi/post/i386-linux-gnu/baseline_symbols.txt: Update.
diff --git a/libstdc++-v3/include/bits/locale_conv.h b/libstdc++-v3/include/bits/locale_conv.h
index 74beaec5ae6..47c8dee53cb 100644
--- a/libstdc++-v3/include/bits/locale_conv.h
+++ b/libstdc++-v3/include/bits/locale_conv.h
@@ -375,7 +375,7 @@ _GLIBCXX_END_NAMESPACE_CXX11
     protected:
       int
       sync()
-      { return _M_buf && _M_conv_put() && _M_buf->pubsync() ? 0 : -1; }
+      { return _M_buf && _M_conv_put() && !_M_buf->pubsync() ? 0 : -1; }
 
       typename _Wide_streambuf::int_type
       overflow(typename _Wide_streambuf::int_type __out)
diff --git a/libstdc++-v3/testsuite/22_locale/conversions/buffer/2.cc b/libstdc++-v3/testsuite/22_locale/conversions/buffer/2.cc
new file mode 100644
index 00000000000..8eda714b61d
--- /dev/null
+++ b/libstdc++-v3/testsuite/22_locale/conversions/buffer/2.cc
@@ -0,0 +1,39 @@
+// 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-do run { target c++11 } }
+
+#include <locale>
+#include <sstream>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  struct Cvt : std::codecvt<char, char, std::mbstate_t> { };
+  std::stringstream ss;
+  std::wbuffer_convert<Cvt, char> cvt(ss.rdbuf());
+  auto p = ss.std::ios::rdbuf(&cvt);
+  ss << "hello";
+  VERIFY( ss.flush().good() );
+  ss.std::ios::rdbuf(p);
+}
+
+int main()
+{
+  test01();
+}
-- 
2.30.2