[PATCH] Use ::new to avoid finding overloaded operator new

[Jonathan Wakely]

As I mentioned in the variant patch thread yesterday, we're not
qualifying the new operator correctly in std::function, so the test
case in this patch was failing.

        PR libstdc++/72820
        * include/std/functional (_Function_base::_Base_manager::_M_clone):
        Qualify new operator.
        * testsuite/20_util/function/cons/72820.cc: New test.

Tested powerpc64-linux, committed to trunk. I'll probably backport it
to the branches after 6.2 is released.



commit 1ecfcb02f41ac6cacdd7284eee6d310040f64ecf
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Fri Aug 5 17:15:06 2016 +0100

    Use ::new to avoid finding overloaded operator new
    
        PR libstdc++/72820
        * include/std/functional (_Function_base::_Base_manager::_M_clone):
        Qualify new operator.
        * testsuite/20_util/function/cons/72820.cc: New test.

diff --git a/libstdc++-v3/include/std/functional 
b/libstdc++-v3/include/std/functional
index 1de914e..8608134 100644
--- a/libstdc++-v3/include/std/functional
+++ b/libstdc++-v3/include/std/functional
@@ -1472,7 +1472,7 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
        static void
        _M_clone(_Any_data& __dest, const _Any_data& __source, true_type)
        {
-         new (__dest._M_access()) _Functor(__source._M_access<_Functor>());
+         ::new (__dest._M_access()) _Functor(__source._M_access<_Functor>());
        }
 
        // Clone a function object that is not location-invariant or
@@ -1553,7 +1553,7 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
       private:
        static void
        _M_init_functor(_Any_data& __functor, _Functor&& __f, true_type)
-       { new (__functor._M_access()) _Functor(std::move(__f)); }
+       { ::new (__functor._M_access()) _Functor(std::move(__f)); }
 
        static void
        _M_init_functor(_Any_data& __functor, _Functor&& __f, false_type)
diff --git a/libstdc++-v3/testsuite/20_util/function/cons/72820.cc 
b/libstdc++-v3/testsuite/20_util/function/cons/72820.cc
new file mode 100644
index 0000000..1b17aae
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/function/cons/72820.cc
@@ -0,0 +1,27 @@
+// Copyright (C) 2016 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 compile { target c++11 } }
+
+#include <functional>
+
+struct foo {
+  void operator()() { }
+  static void* operator new(std::size_t, void* p);
+};
+
+std::function<void()> f = foo{};