libstdc++: Fix some warnings in headers

These are usually suppressed without -Wsystem-headers.

libstdc++-v3/ChangeLog:

	* include/bits/hashtable_policy.h (_Local_iterator_base): Cast
	value to avoid -Wsign-compare warnings.
	* include/bits/regex.h (sub_match::_M_str): Avoid narrowing
	conversion.
	* include/bits/regex_compiler.tcc (_Compiler::_M_quantifier):
	Initialize variable to avoid -Wmaybe-uninitialized warning.
	* include/bits/shared_ptr_base.h (_Sp_counted_deleter::_Impl):
	Reorder mem-initializer-list to avoid -Wreorder warning.
	* include/bits/stl_tree.h (_Rb_tree_impl): Explicitly
	initialize base class in copy constructor.
	* include/debug/safe_iterator.h (_Safe_iterator): Likewise.
	* include/ext/debug_allocator.h: Reorder mem-initializer-list
	to avoid -Wreorder warning.
	* include/ext/throw_allocator.h (throw_allocator_limit)
	(throw_allocator_random): Add user-declared assignment operators
	to avoid -Wdeprecated-copy warnings.

libstdc++-v3/include/bits/hashtable_policy.h

@@ -1368,7 +1368,7 @@ namespace __detail
 
       ~_Local_iterator_base()
       {
-	if (_M_bucket_count != -1)
+	if (_M_bucket_count != size_t(-1))
 	  _M_destroy();
       }
 
@@ -1376,7 +1376,7 @@ namespace __detail
       : __node_iter_base(__iter._M_cur), _M_bucket(__iter._M_bucket)
       , _M_bucket_count(__iter._M_bucket_count)
       {
-	if (_M_bucket_count != -1)
+	if (_M_bucket_count != size_t(-1))
 	  _M_init(*__iter._M_h());
       }
 

libstdc++-v3/include/bits/regex.h

@@ -994,7 +994,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
 	_M_str() const noexcept
 	{
 	  if (this->matched)
-	    if (auto __len = this->second - this->first)
+	    if (size_t __len = this->second - this->first)
 	      return { std::__addressof(*this->first), __len };
 	  return {};
 	}

libstdc++-v3/include/bits/regex_compiler.tcc

@@ -233,16 +233,16 @@ namespace __detail
 	  _StateSeqT __e(*_M_nfa, _M_nfa->_M_insert_dummy());
 	  long __min_rep = _M_cur_int_value(10);
 	  bool __infi = false;
-	  long __n;
+	  long __n = 0;
 
 	  // {3
 	  if (_M_match_token(_ScannerT::_S_token_comma))
-	    if (_M_match_token(_ScannerT::_S_token_dup_count)) // {3,7}
-	      __n = _M_cur_int_value(10) - __min_rep;
-	    else
-	      __infi = true;
-	  else
-	    __n = 0;
+	    {
+	      if (_M_match_token(_ScannerT::_S_token_dup_count)) // {3,7}
+		__n = _M_cur_int_value(10) - __min_rep;
+	      else
+		__infi = true;
+	    }
 	  if (!_M_match_token(_ScannerT::_S_token_interval_end))
 	    __throw_regex_error(regex_constants::error_brace,
 				"Unexpected end of brace expression.");

libstdc++-v3/include/bits/shared_ptr_base.h

@@ -415,7 +415,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       public:
 	_Impl(_Ptr __p, _Deleter __d, const _Alloc& __a) noexcept
-	: _M_ptr(__p), _Del_base(std::move(__d)), _Alloc_base(__a)
+	: _Del_base(std::move(__d)), _Alloc_base(__a), _M_ptr(__p)
 	{ }
 
 	_Deleter& _M_del() noexcept { return _Del_base::_S_get(*this); }

libstdc++-v3/include/bits/stl_tree.h

@@ -691,6 +691,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  _Rb_tree_impl(const _Rb_tree_impl& __x)
 	  : _Node_allocator(_Alloc_traits::_S_select_on_copy(__x))
 	  , _Base_key_compare(__x._M_key_compare)
+	  , _Rb_tree_header()
 	  { }
 
 #if __cplusplus < 201103L

libstdc++-v3/include/debug/safe_iterator.h

@@ -170,7 +170,7 @@ namespace __gnu_debug
        * @brief Copy construction.
        */
       _Safe_iterator(const _Safe_iterator& __x) _GLIBCXX_NOEXCEPT
-      : _Iter_base(__x.base())
+      : _Iter_base(__x.base()), _Safe_base()
       {
 	// _GLIBCXX_RESOLVE_LIB_DEFECTS
 	// DR 408. Is vector<reverse_iterator<char*> > forbidden?

libstdc++-v3/include/ext/debug_allocator.h

@@ -112,10 +112,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       template<typename _Alloc2>
 	debug_allocator(const debug_allocator<_Alloc2>& __a2,
 			typename __convertible<_Alloc2>::__type = 0)
-	: _M_allocator(__a2._M_allocator), _M_extra(_S_extra()) { }
+	: _M_extra(_S_extra()), _M_allocator(__a2._M_allocator)  { }
 
       debug_allocator(const _Alloc& __a)
-      : _M_allocator(__a), _M_extra(_S_extra()) { }
+      : _M_extra(_S_extra()), _M_allocator(__a)  { }
 
       _GLIBCXX_NODISCARD pointer
       allocate(size_type __n)

libstdc++-v3/include/ext/throw_allocator.h

@@ -922,6 +922,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	_GLIBCXX_USE_NOEXCEPT { }
 
       ~throw_allocator_limit() _GLIBCXX_USE_NOEXCEPT { }
+
+#if __cplusplus >= 201103L
+      throw_allocator_limit&
+      operator=(const throw_allocator_limit&) = default;
+#endif
     };
 
 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
@@ -944,6 +949,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	_GLIBCXX_USE_NOEXCEPT { }
 
       ~throw_allocator_random() _GLIBCXX_USE_NOEXCEPT { }
+
+#if __cplusplus >= 201103L
+      throw_allocator_random&
+      operator=(const throw_allocator_random&) = default;
+#endif
     };
 #endif // _GLIBCXX_USE_C99_STDINT_TR1