re PR c++/79641 (ICE with const variable and attribute)

	PR c++/79641
	* c-attribs.c (handle_mode_attribute): Use build_qualified_type to
	preserve quals.

	* c-c++-common/pr79641.c: New test.

From-SVN: r245632

gcc/c-family/ChangeLog

+2017-02-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/79641
+	* c-attribs.c (handle_mode_attribute): Use build_qualified_type to
+	preserve quals.
+
 2017-02-17  Joseph Myers  <joseph@codesourcery.com>
 
 	* c-cppbuiltin.c (builtin_define_float_constants): Define

gcc/c-family/c-attribs.c

@@ -1430,7 +1430,7 @@ handle_mode_attribute (tree *node, tree name, tree args,
 	  return NULL_TREE;
 	}
 
-      *node = typefm;
+      *node = build_qualified_type (typefm, TYPE_QUALS (type));
     }
 
   return NULL_TREE;

gcc/testsuite/ChangeLog

 2017-02-21  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/79641
+	* c-c++-common/pr79641.c: New test.
+
 	PR tree-optimization/79649
 	* gcc.target/i386/pr79649.c: New test.
 

gcc/testsuite/c-c++-common/pr79641.c

+/* PR c++/79641 */
+/* { dg-do compile } */
+
+const int __attribute__((__mode__ (__QI__))) i = 0;