[patch] libstdc++/60497 - Qualify calls to prevent ADL

[Jonathan Wakely]

Tested x86_64-linux, committed to trunk.



commit a3b70e775c9f1f5f6cab1b8e6307f01c582ce5b3
Author: Jonathan Wakely <a...@kayari.org>
Date:   Mon Apr 14 16:17:03 2014 +0100

        PR libstdc++/60497
        * include/std/tuple (get): Qualify calls to prevent ADL.
        * testsuite/20_util/tuple/60497.cc: New.

diff --git a/libstdc++-v3/include/std/tuple b/libstdc++-v3/include/std/tuple
index 92ecdb9..47a10ec 100644
--- a/libstdc++-v3/include/std/tuple
+++ b/libstdc++-v3/include/std/tuple
@@ -755,14 +755,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
                       typename tuple_element<__i, tuple<_Elements...>>::type
                     >::type
     get(tuple<_Elements...>& __t) noexcept
-    { return __get_helper<__i>(__t); }
+    { return std::__get_helper<__i>(__t); }
 
   template<std::size_t __i, typename... _Elements>
     constexpr typename __add_c_ref<
                       typename tuple_element<__i, tuple<_Elements...>>::type
                     >::type
     get(const tuple<_Elements...>& __t) noexcept
-    { return __get_helper<__i>(__t); }
+    { return std::__get_helper<__i>(__t); }
 
   template<std::size_t __i, typename... _Elements>
     constexpr typename __add_r_ref<
@@ -786,17 +786,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template <typename _Tp, typename... _Types>
     constexpr _Tp&
     get(tuple<_Types...>& __t) noexcept
-    { return __get_helper2<_Tp>(__t); }
+    { return std::__get_helper2<_Tp>(__t); }
 
   template <typename _Tp, typename... _Types>
     constexpr _Tp&&
     get(tuple<_Types...>&& __t) noexcept
-    { return std::move(__get_helper2<_Tp>(__t)); }
+    { return std::move(std::__get_helper2<_Tp>(__t)); }
 
   template <typename _Tp, typename... _Types>
     constexpr const _Tp&
     get(const tuple<_Types...>& __t) noexcept
-    { return __get_helper2<_Tp>(__t); }
+    { return std::__get_helper2<_Tp>(__t); }
 #endif
 
   // This class helps construct the various comparison operations on tuples
diff --git a/libstdc++-v3/testsuite/20_util/tuple/60497.cc 
b/libstdc++-v3/testsuite/20_util/tuple/60497.cc
new file mode 100644
index 0000000..76d4223
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/tuple/60497.cc
@@ -0,0 +1,37 @@
+// { dg-options "-std=gnu++14" }
+// { dg-do compile }
+
+// Copyright (C) 2014 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/>.
+
+// libstdc++/60497
+
+#include <tuple>
+
+struct A;
+template<typename T> struct B { T t; };
+
+using element_type = B<A>*;
+using tuple_type = std::tuple<element_type>;
+
+tuple_type t;
+const tuple_type ct;
+
+auto a = std::get<0>(t);
+auto b = std::get<0>(ct);
+auto c = std::get<element_type>(t);
+auto d = std::get<element_type>(ct);