PR middle-end/89303 add testcase for std::enable_shared_from_this

	* testsuite/20_util/enable_shared_from_this/89303.cc: New test.

From-SVN: r268869

libstdc++-v3/ChangeLog

 2019-02-14  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR middle-end/89303
+	* testsuite/20_util/enable_shared_from_this/89303.cc: New test.
+
 	* doc/xml/manual/intro.xml: Document LWG 2735 status.
 	* include/bits/std_abs.h: Add comment about LWG 2735.
 	* testsuite/26_numerics/headers/cstdlib/dr2735.cc: New test.

libstdc++-v3/testsuite/20_util/enable_shared_from_this/89303.cc

+// Copyright (C) 2019 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 "-O1" }
+// { dg-do run { target c++11 } }
+
+// PR middle-end/89303
+
+#include <memory>
+
+class blob final: public std::enable_shared_from_this<blob>
+{
+  int* data;
+
+public:
+  blob() { data = new int; }
+  ~blob() { delete data; }
+};
+
+int
+main()
+{
+  std::shared_ptr<blob> tg = std::make_shared<blob>();
+  return tg->shared_from_this().use_count() - 2;
+}