[patch] Fix some pedantic warnings

[Jonathan Wakely]

This fixes some warnings when building the library with -Wpedantic
(some only show up when also building with -Wsystem-headers).

Tested x86_64-linux, committed to trunk.

commit bf385e3ea2d8d10bdaa8e41c7638d32eb26b9bfd
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Tue Jun 24 14:16:28 2014 +0100

    	* include/bits/functexcept.h (__throw_out_of_range_fmt): Change
    	attribute to __gnu_printf__ archetype to prevent warnings for "%zu".
    	* include/bits/locale_facets_nonio.tcc (time_get::do_get_weekday):
    	Remove unused typedef.
    	(time_get::do_get_monthname): Likewise.
    	* include/bits/stl_tree.h: Add system_header pragma.
    	* include/ext/stdio_sync_filebuf.h (stdio_sync_filebuf::file): Remove
    	redundant const-qualifier.
    	* include/std/complex (complex::__rep): Use _GLIBCXX_CONSTEXPR macro
    	instead of _GLIBCXX_USE_CONSTEXPR.

diff --git a/libstdc++-v3/include/bits/functexcept.h b/libstdc++-v3/include/bits/functexcept.h
index b8359f9..48be255 100644
--- a/libstdc++-v3/include/bits/functexcept.h
+++ b/libstdc++-v3/include/bits/functexcept.h
@@ -76,7 +76,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   void
   __throw_out_of_range_fmt(const char*, ...) __attribute__((__noreturn__))
-    __attribute__((__format__(__printf__, 1, 2)));
+    __attribute__((__format__(__gnu_printf__, 1, 2)));
 
   void
   __throw_runtime_error(const char*) __attribute__((__noreturn__));
diff --git a/libstdc++-v3/include/bits/locale_facets_nonio.tcc b/libstdc++-v3/include/bits/locale_facets_nonio.tcc
index 41d944d..c9f8dac 100644
--- a/libstdc++-v3/include/bits/locale_facets_nonio.tcc
+++ b/libstdc++-v3/include/bits/locale_facets_nonio.tcc
@@ -1064,7 +1064,6 @@ _GLIBCXX_END_NAMESPACE_LDBL
     do_get_weekday(iter_type __beg, iter_type __end, ios_base& __io,
 		   ios_base::iostate& __err, tm* __tm) const
     {
-      typedef char_traits<_CharT>		__traits_type;
       const locale& __loc = __io._M_getloc();
       const __timepunct<_CharT>& __tp = use_facet<__timepunct<_CharT> >(__loc);
       const ctype<_CharT>& __ctype = use_facet<ctype<_CharT> >(__loc);
@@ -1092,7 +1091,6 @@ _GLIBCXX_END_NAMESPACE_LDBL
     do_get_monthname(iter_type __beg, iter_type __end,
                      ios_base& __io, ios_base::iostate& __err, tm* __tm) const
     {
-      typedef char_traits<_CharT>		__traits_type;
       const locale& __loc = __io._M_getloc();
       const __timepunct<_CharT>& __tp = use_facet<__timepunct<_CharT> >(__loc);
       const ctype<_CharT>& __ctype = use_facet<ctype<_CharT> >(__loc);
diff --git a/libstdc++-v3/include/bits/stl_tree.h b/libstdc++-v3/include/bits/stl_tree.h
index ce43ab8..cc9bf94 100644
--- a/libstdc++-v3/include/bits/stl_tree.h
+++ b/libstdc++-v3/include/bits/stl_tree.h
@@ -58,6 +58,8 @@
 #ifndef _STL_TREE_H
 #define _STL_TREE_H 1
 
+#pragma GCC system_header
+
 #include <bits/stl_algobase.h>
 #include <bits/allocator.h>
 #include <bits/stl_function.h>
diff --git a/libstdc++-v3/include/ext/stdio_sync_filebuf.h b/libstdc++-v3/include/ext/stdio_sync_filebuf.h
index 5ca16eb..73283a7 100644
--- a/libstdc++-v3/include/ext/stdio_sync_filebuf.h
+++ b/libstdc++-v3/include/ext/stdio_sync_filebuf.h
@@ -84,7 +84,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  Note that there is no way for the library to track what you do
        *  with the file, so be careful.
        */
-      std::__c_file* const
+      std::__c_file*
       file() { return this->_M_file; }
 
     protected:
diff --git a/libstdc++-v3/include/std/complex b/libstdc++-v3/include/std/complex
index 5849cd5..1ae6c45 100644
--- a/libstdc++-v3/include/std/complex
+++ b/libstdc++-v3/include/std/complex
@@ -217,7 +217,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       template<typename _Up>
         complex<_Tp>& operator/=(const complex<_Up>&);
 
-      _GLIBCXX_USE_CONSTEXPR complex __rep() const
+      _GLIBCXX_CONSTEXPR complex __rep() const
       { return *this; }
 
     private:
@@ -1180,7 +1180,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  return *this;
 	}
 
-      _GLIBCXX_USE_CONSTEXPR _ComplexT __rep() const { return _M_value; }
+      _GLIBCXX_CONSTEXPR _ComplexT __rep() const { return _M_value; }
 
     private:
       _ComplexT _M_value;
@@ -1330,7 +1330,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  return *this;
 	}
 
-      _GLIBCXX_USE_CONSTEXPR _ComplexT __rep() const { return _M_value; }
+      _GLIBCXX_CONSTEXPR _ComplexT __rep() const { return _M_value; }
 
     private:
       _ComplexT _M_value;
@@ -1482,7 +1482,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  return *this;
 	}
 
-      _GLIBCXX_USE_CONSTEXPR _ComplexT __rep() const { return _M_value; }
+      _GLIBCXX_CONSTEXPR _ComplexT __rep() const { return _M_value; }
 
     private:
       _ComplexT _M_value;