re PR c/69669 (ICE with enum __attribute__((mode(QI))))

	PR c/69669
	* c-decl.c (finish_enum): When honoring mode attribute,
	make sure to use proper TYPE_MIN_VALUE and TYPE_MAX_VALUE.

	* c-c++-common/pr69669.c: New test.

From-SVN: r233154

gcc/c/ChangeLog

+2016-02-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/69669
+	* c-decl.c (finish_enum): When honoring mode attribute,
+	make sure to use proper TYPE_MIN_VALUE and TYPE_MAX_VALUE.
+
 2016-01-29  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/69518

gcc/c/c-decl.c

@@ -8037,7 +8037,24 @@ finish_enum (tree enumtype, tree values, tree attributes)
   precision = MAX (tree_int_cst_min_precision (minnode, sign),
 		   tree_int_cst_min_precision (maxnode, sign));
 
-  if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
+  /* If the precision of the type was specified with an attribute and it
+     was too small, give an error.  Otherwise, use it.  */
+  if (TYPE_PRECISION (enumtype) && lookup_attribute ("mode", attributes))
+    {
+      if (precision > TYPE_PRECISION (enumtype))
+	{
+	  TYPE_PRECISION (enumtype) = 0;
+	  error ("specified mode too small for enumeral values");
+	}
+      else
+	precision = TYPE_PRECISION (enumtype);
+    }
+  else
+    TYPE_PRECISION (enumtype) = 0;
+
+  if (TYPE_PACKED (enumtype)
+      || precision > TYPE_PRECISION (integer_type_node)
+      || TYPE_PRECISION (enumtype))
     {
       tem = c_common_type_for_size (precision, sign == UNSIGNED ? 1 : 0);
       if (tem == NULL)
@@ -8054,17 +8071,7 @@ finish_enum (tree enumtype, tree values, tree attributes)
   TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
   TYPE_ALIGN (enumtype) = TYPE_ALIGN (tem);
   TYPE_SIZE (enumtype) = 0;
-
-  /* If the precision of the type was specified with an attribute and it
-     was too small, give an error.  Otherwise, use it.  */
-  if (TYPE_PRECISION (enumtype)
-      && lookup_attribute ("mode", attributes))
-    {
-      if (precision > TYPE_PRECISION (enumtype))
-	error ("specified mode too small for enumeral values");
-    }
-  else
-    TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
+  TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
 
   layout_type (enumtype);
 

gcc/testsuite/ChangeLog

+2016-02-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/69669
+	* c-c++-common/pr69669.c: New test.
+
 2016-02-04  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	PR target/69667

gcc/testsuite/c-c++-common/pr69669.c

+/* PR c/69669 */
+/* { dg-do compile } */
+
+enum __attribute__((mode(QI))) E { F = 1 };
+
+void
+foo (enum E *x, int y)
+{
+  *x = (enum E) y;
+}