re PR c++/34917 (ICE with const vector)

	PR c++/34917
	* tree.c (build_type_attribute_qual_variant): Call
	build_qualified_type if attributes are equal, but quals are not.

	* g++.dg/ext/vector12.C: New test.

From-SVN: r131726

gcc/ChangeLog

+2008-01-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/34917
+	* tree.c (build_type_attribute_qual_variant): Call
+	build_qualified_type if attributes are equal, but quals are not.
+
 2008-01-22  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
 
 	PR 32102

gcc/testsuite/ChangeLog

+2008-01-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/34917
+	* g++.dg/ext/vector12.C: New test.
+
 2008-01-22  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
 
 	PR 32102

gcc/testsuite/g++.dg/ext/vector12.C

+// PR c++/34917
+// { dg-do compile }
+
+const int i __attribute ((vector_size (8))) = {};

gcc/tree.c

@@ -3735,6 +3735,8 @@ build_type_attribute_qual_variant (tree ttype, tree attribute, int quals)
 
       ttype = build_qualified_type (ntype, quals);
     }
+  else if (TYPE_QUALS (ttype) != quals)
+    ttype = build_qualified_type (ttype, quals);
 
   return ttype;
 }