Add a libstdc++-4.4 patch for C++0x to the website.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@128498 91177308-0d34-0410-b5e6-96231b3b80d8

www/cxx_status.html

@@ -85,6 +85,11 @@
 ISO C++ standard (1998/2003). This section tracks the status of various C++0x
 features.</p>
 
+<p>You can use clang in C++0x mode either
+with <a href="http://libcxx.llvm.org/">libc++</a> or with gcc's libstdc++.
+libstdc++-4.4 requires <a href="libstdc++4.4-clang0x.patch">a patch</a> to work
+with clang; other versions have not been tested.</p>
+
 
 <h2 id="specification">Implementation Status by Feature</h2>
 

www/libstdc++4.4-clang0x.patch

+This patch was generated from the headers installed by MacPorts
+gcc-4.4 on OS X 10.6.  You can apply it there with
+`cd /opt/local/include/gcc44/c++ ; sudo patch -p1 <this_patch`, or similar
+on other operating systems.  Mail cfe-dev if you find other problems in the
+standard headers.
+
+This patch is offered under the same modified GPLv3 as libstdc++-4.4.
+
+diff -ur a/bits/move.h b/bits/move.h
+--- a/bits/move.h	2011-03-15 14:49:05.000000000 -0700
++++ b/bits/move.h	2011-03-29 10:33:39.000000000 -0700
+@@ -48,13 +48,35 @@
+ 
+   template<typename _Tp>
+     inline _Tp&&
+-    forward(typename std::identity<_Tp>::type&& __t)
++    forward(typename std::remove_reference<_Tp>::type& __t)
++#ifdef __clang__
++    { return static_cast<_Tp&&>(__t); }
++#else
+     { return __t; }
++#endif
++
++  template<typename _Tp>
++    inline _Tp&&
++    forward(typename std::remove_reference<_Tp>::type&& __t)
++    {
++#ifdef __clang__
++      static_assert(!std::is_lvalue_reference<_Tp>::value,
++                    "Can't instantiate this forward() with an"
++                    " lvalue reference type.");
++      return static_cast<_Tp&&>(__t);
++#else
++      return __t;
++#endif
++    }
+ 
+   template<typename _Tp>
+     inline typename std::remove_reference<_Tp>::type&&
+     move(_Tp&& __t)
++#ifdef __clang__
++    { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); }
++#else
+     { return __t; }
++#endif
+ 
+ _GLIBCXX_END_NAMESPACE
+ 
+diff -ur a/bits/stl_deque.h b/bits/stl_deque.h
+--- a/bits/stl_deque.h	2011-03-15 14:49:05.000000000 -0700
++++ b/bits/stl_deque.h	2011-03-29 10:33:39.000000000 -0700
+@@ -1395,11 +1395,7 @@
+        *  std::swap(d1,d2) will feed to this function.
+        */
+       void
+-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+-      swap(deque&& __x)
+-#else
+       swap(deque& __x)
+-#endif
+       {
+ 	std::swap(this->_M_impl._M_start, __x._M_impl._M_start);
+ 	std::swap(this->_M_impl._M_finish, __x._M_impl._M_finish);
+diff -ur a/bits/stl_iterator.h b/bits/stl_iterator.h
+--- a/bits/stl_iterator.h	2011-03-15 14:49:05.000000000 -0700
++++ b/bits/stl_iterator.h	2011-03-29 10:33:39.000000000 -0700
+@@ -913,7 +913,7 @@
+ 
+       reference
+       operator*() const
+-      { return *_M_current; }
++      { return std::move(*_M_current); }
+ 
+       pointer
+       operator->() const
+diff -ur a/bits/stl_list.h b/bits/stl_list.h
+--- a/bits/stl_list.h	2011-03-15 14:49:05.000000000 -0700
++++ b/bits/stl_list.h	2011-03-29 10:33:39.000000000 -0700
+@@ -1106,11 +1106,7 @@
+        *  function.
+        */
+       void
+-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+-      swap(list&& __x)
+-#else
+       swap(list& __x)
+-#endif
+       {
+ 	_List_node_base::swap(this->_M_impl._M_node, __x._M_impl._M_node);
+ 
+@@ -1160,6 +1156,12 @@
+ 	  }
+       }
+ 
++#ifdef __GXX_EXPERIMENTAL_CXX0X__
++      void
++      splice(iterator __position, list& __x)
++      { splice(__position, std::move(__x)); }
++#endif
++
+       /**
+        *  @brief  Insert element from another %list.
+        *  @param  position  Iterator referencing the element to insert before.
+@@ -1187,6 +1189,12 @@
+ 	this->_M_transfer(__position, __i, __j);
+       }
+ 
++#ifdef __GXX_EXPERIMENTAL_CXX0X__
++      void
++      splice(iterator __position, list& __x, iterator __i)
++      { splice(__position, std::move(__x), __i); }
++#endif
++
+       /**
+        *  @brief  Insert range from another %list.
+        *  @param  position  Iterator referencing the element to insert before.
+@@ -1217,6 +1225,13 @@
+ 	  }
+       }
+ 
++#ifdef __GXX_EXPERIMENTAL_CXX0X__
++      void
++      splice(iterator __position, list& __x, iterator __first,
++	     iterator __last)
++      { splice(__position, std::move(__x), __first, __last); }
++#endif
++
+       /**
+        *  @brief  Remove all elements equal to value.
+        *  @param  value  The value to remove.
+@@ -1287,6 +1302,10 @@
+       void
+ #ifdef __GXX_EXPERIMENTAL_CXX0X__
+       merge(list&& __x);
++
++      void
++      merge(list& __x)
++      { merge(std::move(__x)); }
+ #else
+       merge(list& __x);
+ #endif
+@@ -1307,6 +1326,11 @@
+         void
+ #ifdef __GXX_EXPERIMENTAL_CXX0X__
+         merge(list&&, _StrictWeakOrdering);
++
++      template<typename _StrictWeakOrdering>
++        void
++        merge(list& __l, _StrictWeakOrdering __comp)
++        { merge(std::move(__l), __comp); }
+ #else
+         merge(list&, _StrictWeakOrdering);
+ #endif
+diff -ur a/bits/stl_map.h b/bits/stl_map.h
+--- a/bits/stl_map.h	2011-03-15 14:49:05.000000000 -0700
++++ b/bits/stl_map.h	2011-03-29 10:33:39.000000000 -0700
+@@ -608,11 +608,7 @@
+        *  that std::swap(m1,m2) will feed to this function.
+        */
+       void
+-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+-      swap(map&& __x)
+-#else
+       swap(map& __x)
+-#endif
+       { _M_t.swap(__x._M_t); }
+ 
+       /**
+diff -ur a/bits/stl_multimap.h b/bits/stl_multimap.h
+--- a/bits/stl_multimap.h	2011-03-15 14:49:05.000000000 -0700
++++ b/bits/stl_multimap.h	2011-03-29 10:33:39.000000000 -0700
+@@ -544,11 +544,7 @@
+        *  std::swap(m1,m2) will feed to this function.
+        */
+       void
+-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+-      swap(multimap&& __x)
+-#else
+       swap(multimap& __x)
+-#endif
+       { _M_t.swap(__x._M_t); }
+ 
+       /**
+diff -ur a/bits/stl_multiset.h b/bits/stl_multiset.h
+--- a/bits/stl_multiset.h	2011-03-15 14:49:05.000000000 -0700
++++ b/bits/stl_multiset.h	2011-03-29 10:33:39.000000000 -0700
+@@ -376,11 +376,7 @@
+        *  std::swap(s1,s2) will feed to this function.
+        */
+       void
+-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+-      swap(multiset&& __x)
+-#else
+       swap(multiset& __x)
+-#endif
+       { _M_t.swap(__x._M_t); }
+ 
+       // insert/erase
+diff -ur a/bits/stl_pair.h b/bits/stl_pair.h
+--- a/bits/stl_pair.h	2011-03-15 14:49:05.000000000 -0700
++++ b/bits/stl_pair.h	2011-03-29 10:33:39.000000000 -0700
+@@ -84,10 +84,21 @@
+       : first(__a), second(__b) { }
+ 
+ #ifdef __GXX_EXPERIMENTAL_CXX0X__
+-      template<class _U1, class _U2>
++      template<class _U1, class = typename
++	       std::enable_if<std::is_convertible<_U1, _T1>::value>::type>
++	pair(_U1&& __x, const _T2& __y)
++	: first(std::forward<_U1>(__x)), second(__y) { }
++
++      template<class _U2, class = typename
++	       std::enable_if<std::is_convertible<_U2, _T2>::value>::type>
++	pair(const _T1& __x, _U2&& __y)
++	: first(__x), second(std::forward<_U2>(__y)) { }
++
++      template<class _U1, class _U2, class = typename
++	       std::enable_if<std::is_convertible<_U1, _T1>::value
++			      && std::is_convertible<_U2, _T2>::value>::type>
+         pair(_U1&& __x, _U2&& __y)
+-	: first(std::forward<_U1>(__x)),
+-	  second(std::forward<_U2>(__y)) { }
++	: first(std::forward<_U1>(__x)), second(std::forward<_U2>(__y)) { }
+ 
+       pair(pair&& __p)
+       : first(std::move(__p.first)),
+@@ -107,11 +118,19 @@
+ 	  second(std::move(__p.second)) { }
+ 
+       // http://gcc.gnu.org/ml/libstdc++/2007-08/msg00052.html
++
++#if 0
++      // This constructor is incompatible with libstdc++-4.6, and it
++      // interferes with passing NULL pointers to the 2-argument
++      // constructors, so we disable it.  map::emplace isn't
++      // implemented in libstdc++-4.4 anyway, and that's what this
++      // constructor was here for.
+       template<class _U1, class _Arg0, class... _Args>
+         pair(_U1&& __x, _Arg0&& __arg0, _Args&&... __args)
+ 	: first(std::forward<_U1>(__x)),
+ 	  second(std::forward<_Arg0>(__arg0),
+ 		 std::forward<_Args>(__args)...) { }
++#endif
+ 
+       pair&
+       operator=(pair&& __p)
+@@ -131,7 +150,7 @@
+ 	}
+ 
+       void
+-      swap(pair&& __p)
++      swap(pair& __p)
+       {
+ 	using std::swap;
+ 	swap(first, __p.first);
+diff -ur a/bits/stl_set.h b/bits/stl_set.h
+--- a/bits/stl_set.h	2011-03-15 14:49:05.000000000 -0700
++++ b/bits/stl_set.h	2011-03-29 10:33:39.000000000 -0700
+@@ -383,11 +383,7 @@
+        *  std::swap(s1,s2) will feed to this function.
+        */
+       void
+-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+-      swap(set&& __x)
+-#else
+       swap(set& __x)	
+-#endif
+       { _M_t.swap(__x._M_t); }
+ 
+       // insert/erase
+diff -ur a/bits/stl_tree.h b/bits/stl_tree.h
+--- a/bits/stl_tree.h	2011-03-15 14:49:05.000000000 -0700
++++ b/bits/stl_tree.h	2011-03-29 10:33:39.000000000 -0700
+@@ -675,11 +675,7 @@
+       { return _M_get_Node_allocator().max_size(); }
+ 
+       void
+-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+-      swap(_Rb_tree&& __t);
+-#else
+       swap(_Rb_tree& __t);      
+-#endif
+ 
+       // Insert/erase.
+       pair<iterator, bool>
+@@ -1104,11 +1100,7 @@
+            typename _Compare, typename _Alloc>
+     void
+     _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
+-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+-    swap(_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&& __t)
+-#else
+     swap(_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __t)
+-#endif
+     {
+       if (_M_root() == 0)
+ 	{
+diff -ur a/bits/stl_vector.h b/bits/stl_vector.h
+--- a/bits/stl_vector.h	2011-03-15 14:49:05.000000000 -0700
++++ b/bits/stl_vector.h	2011-03-29 10:33:39.000000000 -0700
+@@ -923,11 +923,7 @@
+        *  std::swap(v1,v2) will feed to this function.
+        */
+       void
+-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+-      swap(vector&& __x)
+-#else
+       swap(vector& __x)
+-#endif
+       {
+ 	std::swap(this->_M_impl._M_start, __x._M_impl._M_start);
+ 	std::swap(this->_M_impl._M_finish, __x._M_impl._M_finish);
+diff -ur a/exception_ptr.h b/exception_ptr.h
+--- a/exception_ptr.h	2011-03-15 14:49:08.000000000 -0700
++++ b/exception_ptr.h	2011-03-29 10:33:39.000000000 -0700
+@@ -140,7 +140,7 @@
+       friend bool 
+       operator==(const exception_ptr&, const exception_ptr&) throw();
+ 
+-      const type_info*
++      const class type_info*
+       __cxa_exception_type() const throw();
+     };
+ 
+diff -ur a/ext/algorithm b/ext/algorithm
+--- a/ext/algorithm	2011-03-15 14:49:05.000000000 -0700
++++ b/ext/algorithm	2011-03-29 10:33:39.000000000 -0700
+@@ -423,6 +423,9 @@
+ 			     __out_last - __out_first);
+     }
+ 
++#ifdef __GXX_EXPERIMENTAL_CXX0X__
++  using std::is_heap;
++#else
+   /**
+    *  This is an SGI extension.
+    *  @ingroup SGIextensions
+@@ -462,6 +465,7 @@
+ 
+       return std::__is_heap(__first, __comp, __last - __first);
+     }
++#endif
+ 
+   // is_sorted, a predicated testing whether a range is sorted in
+   // nondescending order.  This is an extension, not part of the C++
+diff -ur a/ext/vstring.h b/ext/vstring.h
+--- a/ext/vstring.h	2011-03-15 14:49:05.000000000 -0700
++++ b/ext/vstring.h	2011-03-29 10:33:39.000000000 -0700
+@@ -152,7 +152,7 @@
+        *  string.
+        */
+       __versa_string(__versa_string&& __str)
+-      : __vstring_base(std::forward<__vstring_base>(__str)) { }
++      : __vstring_base(std::move(__str)) { }
+ 
+       /**
+        *  @brief  Construct string from an initializer list.
+@@ -1439,11 +1439,7 @@
+        *  constant time.
+       */
+       void
+-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+-      swap(__versa_string&& __s)
+-#else
+       swap(__versa_string& __s)
+-#endif
+       { this->_M_swap(__s); }
+ 
+       // String operations: