Index: gcc/doc/invoke.texi
===================================================================
--- gcc/doc/invoke.texi	(revision 120173)
+++ gcc/doc/invoke.texi	(working copy)
@@ -192,7 +192,7 @@ in the following sections.
 -Weffc++  -Wno-deprecated  -Wstrict-null-sentinel @gol
 -Wno-non-template-friend  -Wold-style-cast @gol
 -Woverloaded-virtual  -Wno-pmf-conversions @gol
--Wsign-promo}
+-Wsign-promo  -Wuninitializable-member}
 
 @item Objective-C and Objective-C++ Language Options
 @xref{Objective-C and Objective-C++ Dialect Options,,Options Controlling
@@ -2935,7 +2935,7 @@ An enumerator and a non-enumerator both 
 
 @item @r{(C++ only)}
 A non-static reference or non-static @samp{const} member appears in a
-class without constructors.
+class without constructors.  This warning can be independently controlled by @option{-Wuninitializable-member}.
 
 @item @r{(C++ only)}
 Ambiguous virtual bases.
@@ -3187,6 +3187,12 @@ an incorrect result when the signed valu
 This warning is also enabled by @option{-Wextra}; to get the other warnings
 of @option{-Wextra} without this warning, use @samp{-Wextra -Wno-sign-compare}.
 
+@item -Wuninitializable-member @r{(C++ only)}
+@opindex Wuninitializable-member
+A non-static reference or non-static @samp{const} member appears in a
+class without constructors.  This warning is also enabled by
+@option{-Wextra}.
+
 @item -Waggregate-return
 @opindex Waggregate-return
 Warn if any functions that return structures or unions are defined or
Index: gcc/testsuite/g++.dg/warn/Wuninitializable-member.C
===================================================================
--- gcc/testsuite/g++.dg/warn/Wuninitializable-member.C	(revision 0)
+++ gcc/testsuite/g++.dg/warn/Wuninitializable-member.C	(revision 0)
@@ -0,0 +1,15 @@
+
+// { dg-do compile } 
+// { dg-options "-Wuninitializable-member" }
+
+class X {
+  int & flag;// { dg-warning "non-static reference 'int& X::flag' in class without a constructor" }
+public:
+  void f(){ flag++ ; }
+};
+
+class Y {
+  const int var;// { dg-warning "non-static const member 'const int Y::var' in class without a constructor" }
+public:
+  int g(){ return 2*var; }
+};
Index: gcc/testsuite/g++.dg/warn/Wuninitializable-member-Wextra.C
===================================================================
--- gcc/testsuite/g++.dg/warn/Wuninitializable-member-Wextra.C	(revision 0)
+++ gcc/testsuite/g++.dg/warn/Wuninitializable-member-Wextra.C	(revision 0)
@@ -0,0 +1,15 @@
+// Test -Wuninitializable-member is enabled by -Wextra
+// { dg-do compile } 
+// { dg-options "-Wextra" }
+
+class X {
+  int & flag;// { dg-warning "non-static reference 'int& X::flag' in class without a constructor" }
+public:
+  void f(){ flag++ ; }
+};
+
+class Y {
+  const int var;// { dg-warning "non-static const member 'const int Y::var' in class without a constructor" }
+public:
+  int g(){ return 2*var; }
+};
Index: gcc/testsuite/g++.dg/warn/Wuninitializable-member-no.C
===================================================================
--- gcc/testsuite/g++.dg/warn/Wuninitializable-member-no.C	(revision 0)
+++ gcc/testsuite/g++.dg/warn/Wuninitializable-member-no.C	(revision 0)
@@ -0,0 +1,15 @@
+// Test disabling -Wuninitializable-member
+// { dg-do compile } 
+// { dg-options "-Wextra -Wno-uninitializable-member" }
+
+class X {
+  int & flag;// { dg-bogus "non-static reference 'int& X::flag' in class without a constructor" }
+public:
+  void f(){ flag++ ; }
+};
+
+class Y {
+  const int var;// { dg-bogus "non-static const member 'const int Y::var' in class without a constructor" }
+public:
+  int g(){ return 2*var; }
+};
Index: gcc/cp/class.c
===================================================================
--- gcc/cp/class.c	(revision 120173)
+++ gcc/cp/class.c	(working copy)
@@ -2907,9 +2907,8 @@ check_field_decls (tree t, tree *access_
 	     members.  */
 	  TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
 
-	  if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t)
-	      && extra_warnings)
-	    warning (OPT_Wextra, "non-static reference %q+#D in class without a constructor", x);
+	  if (!TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t))
+	    warning (OPT_Wuninitializable_member, "non-static reference %q+#D in class without a constructor", x);
 	}
 
       type = strip_array_types (type);
@@ -2985,9 +2984,8 @@ check_field_decls (tree t, tree *access_
 	     members.  */
 	  TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
 
-	  if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t)
-	      && extra_warnings)
-	    warning (OPT_Wextra, "non-static const member %q+#D in class without a constructor", x);
+	  if (!TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t))
+            warning (OPT_Wuninitializable_member, "non-static const member %q+#D in class without a constructor", x);
 	}
       /* A field that is pseudo-const makes the structure likewise.  */
       else if (CLASS_TYPE_P (type))
Index: gcc/c.opt
===================================================================
--- gcc/c.opt	(revision 120173)
+++ gcc/c.opt	(working copy)
@@ -427,6 +427,10 @@ Wundef
 C ObjC C++ ObjC++
 Warn if an undefined macro is used in an #if directive
 
+Wuninitializable-member
+C++ ObjC++ Var(warn_uninitializable_member) Init(-1)
+Warn for non-static reference or const member in a class without constructors
+
 Wunknown-pragmas
 C ObjC C++ ObjC++
 Warn about unrecognized pragmas
Index: gcc/c-opts.c
===================================================================
--- gcc/c-opts.c	(revision 120173)
+++ gcc/c-opts.c	(working copy)
@@ -1026,7 +1026,8 @@ c_common_post_options (const char **pfil
     flag_exceptions = 1;
 
   /* -Wextra implies -Wclobbered, -Wempty-body, -Wsign-compare, 
-     -Wmissing-field-initializers, -Wmissing-parameter-type and -Woverride-init, 
+     -Wmissing-field-initializers, -Wmissing-parameter-type,
+     -Woverride-init and -Wuninitializable-member, 
      but not if explicitly overridden.  */
   if (warn_clobbered == -1)
     warn_clobbered = extra_warnings;
@@ -1040,6 +1041,8 @@ c_common_post_options (const char **pfil
     warn_missing_parameter_type = extra_warnings;
   if (warn_override_init == -1)
     warn_override_init = extra_warnings;
+  if (warn_uninitializable_member == -1)
+    warn_uninitializable_member = extra_warnings;
 
   /* -Wpointer_sign is disabled by default, but it is enabled if any
      of -Wall or -pedantic are given.  */