re PR c++/34180 (Default copy constructor copies const auto_ptr members)

	PR c++/34180
	* method.c (do_build_copy_constructor): Don't drop cv-quals from
	the field type.

From-SVN: r153960

gcc/cp/ChangeLog

 2009-11-05  Jason Merrill  <jason@redhat.com>
 
+	PR c++/34180
+	* method.c (do_build_copy_constructor): Don't drop cv-quals from
+	the field type.
+
 	PR c++/7046
 	* class.c (finish_struct): Store maximum_field_alignment in
 	TYPE_PRECISION.

gcc/cp/method.c

@@ -622,6 +622,7 @@ do_build_copy_constructor (tree fndecl)
 
 	      if (DECL_MUTABLE_P (field))
 		quals &= ~TYPE_QUAL_CONST;
+	      quals |= TYPE_QUALS (expr_type);
 	      expr_type = cp_build_qualified_type (expr_type, quals);
 	    }
 

gcc/testsuite/ChangeLog

 2009-11-05  Jason Merrill  <jason@redhat.com>
 
+	PR c++/34180
+	* g++.dg/init/synth2.C: New.
+
 	PR c++/7046
 	* g++.dg/abi/pragma-pack1.C: New.
 

gcc/testsuite/g++.dg/init/synth2.C

+// PR c++/34180
+
+struct G {
+  G();				// { dg-message "" "candidate" }
+  G(G&);			// { dg-message "" "candidate" }
+};
+
+class A
+{				// { dg-error "no match" }
+  const G g;
+};
+
+int main()
+{
+  A a;
+  A b = a;			// { dg-message "required here" }
+}