call.c (add_builtin_candidates): Use cv_unqualified rather than TYPE_MAIN_VARIANT.

	* call.c (add_builtin_candidates): Use cv_unqualified rather than
	TYPE_MAIN_VARIANT.
	* pt.c (tsubst_arg_types): Likewise.
	* except.c (build_throw): Use cv_unqualified.

From-SVN: r175272

gcc/cp/ChangeLog

 2011-06-21  Jason Merrill  <jason@redhat.com>
 
+	* call.c (add_builtin_candidates): Use cv_unqualified rather than
+	TYPE_MAIN_VARIANT.
+	* pt.c (tsubst_arg_types): Likewise.
+	* except.c (build_throw): Use cv_unqualified.
+
 	PR c++/49418
 	* call.c (cxx_type_promotes_to): Don't strip cv-quals.
 	* semantics.c (lambda_return_type): Strip them here.

gcc/cp/call.c

@@ -2773,7 +2773,7 @@ add_builtin_candidates (struct z_candidate **candidates, enum tree_code code,
 	      type = non_reference (type);
 	      if (i != 0 || ! ref1)
 		{
-		  type = TYPE_MAIN_VARIANT (type_decays_to (type));
+		  type = cv_unqualified (type_decays_to (type));
 		  if (enum_p && TREE_CODE (type) == ENUMERAL_TYPE)
 		    VEC_safe_push (tree, gc, types[i], type);
 		  if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
@@ -2792,7 +2792,7 @@ add_builtin_candidates (struct z_candidate **candidates, enum tree_code code,
 	  type = non_reference (argtypes[i]);
 	  if (i != 0 || ! ref1)
 	    {
-	      type = TYPE_MAIN_VARIANT (type_decays_to (type));
+	      type = cv_unqualified (type_decays_to (type));
 	      if (enum_p && UNSCOPED_ENUM_P (type))
 		VEC_safe_push (tree, gc, types[i], type);
 	      if (INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))

gcc/cp/except.c

@@ -722,7 +722,7 @@ build_throw (tree exp)
 	 respectively.  */
       temp_type = is_bitfield_expr_with_lowered_type (exp);
       if (!temp_type)
-	temp_type = type_decays_to (TREE_TYPE (exp));
+	temp_type = cv_unqualified (type_decays_to (TREE_TYPE (exp)));
 
       /* OK, this is kind of wacky.  The standard says that we call
 	 terminate when the exception handling mechanism, after

gcc/cp/pt.c

@@ -10246,7 +10246,7 @@ tsubst_arg_types (tree arg_types,
     
     /* Do array-to-pointer, function-to-pointer conversion, and ignore
        top-level qualifiers as required.  */
-    type = TYPE_MAIN_VARIANT (type_decays_to (type));
+    type = cv_unqualified (type_decays_to (type));
 
     /* We do not substitute into default arguments here.  The standard
        mandates that they be instantiated only when needed, which is