re PR c/82340 (volatile ignored in compound literal)

	PR c/82340
	* c-decl.c (build_compound_literal): Use c_apply_type_quals_to_decl
	instead of trying to set just TREE_READONLY manually.

	* gcc.dg/tree-ssa/pr82340.c: New test.

From-SVN: r253280

gcc/c/ChangeLog

+2017-09-29  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/82340
+	* c-decl.c (build_compound_literal): Use c_apply_type_quals_to_decl
+	instead of trying to set just TREE_READONLY manually.
+
 2017-09-16  Tom de Vries  <tom@codesourcery.com>
 
 	PR c/81875

gcc/c/c-decl.c

@@ -5247,9 +5247,7 @@ build_compound_literal (location_t loc, tree type, tree init, bool non_const)
   DECL_ARTIFICIAL (decl) = 1;
   DECL_IGNORED_P (decl) = 1;
   TREE_TYPE (decl) = type;
-  TREE_READONLY (decl) = (TYPE_READONLY (type)
-			  || (TREE_CODE (type) == ARRAY_TYPE
-			      && TYPE_READONLY (TREE_TYPE (type))));
+  c_apply_type_quals_to_decl (TYPE_QUALS (strip_array_types (type)), decl);
   store_init_value (loc, decl, init, NULL_TREE);
 
   if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))

gcc/testsuite/ChangeLog

 2017-09-29  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c/82340
+	* gcc.dg/tree-ssa/pr82340.c: New test.
+
 	* g++.dg/eh/uncaught3.C: Add -Wno-deprecated for c++17.
 
 2017-09-28  Paolo Carlini  <paolo.carlini@oracle.com>

gcc/testsuite/gcc.dg/tree-ssa/pr82340.c

+/* PR c/82340 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-ssa" } */
+/* { dg-final { scan-tree-dump "D.\[0-9]*\\\[0\\\] ={v} 77;" "ssa" } } */
+
+int
+foo (void)
+{
+  int i;
+  volatile char *p = (volatile char[1]) { 77 };
+  for (i = 1; i < 10; i++)
+    *p = 4;
+  return *p;
+}