decl.c (finish_enum_value_list): Use the specified mode.

2016-05-19  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * decl.c (finish_enum_value_list): Use the specified mode.

testsuite:
2016-05-19  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * c-c++-common/pr69669.c: Check the used mode.

From-SVN: r236458

gcc/cp/ChangeLog

+2016-05-19  Bernd Edlinger  <bernd.edlinger@hotmail.de>
+
+	* decl.c (finish_enum_value_list): Use the specified mode.
+
 2016-05-18  Jason Merrill  <jason@redhat.com>
 
 	* pt.c (value_dependent_expression_p): Tweak new cases to better

gcc/cp/decl.c

@@ -13346,6 +13346,19 @@ finish_enum_value_list (tree enumtype)
       use_short_enum = flag_short_enums
         || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
 
+      /* 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))
+	{
+	  if (precision > TYPE_PRECISION (enumtype))
+	    error ("specified mode too small for enumeral values");
+	  else
+	    {
+	      use_short_enum = true;
+	      precision = TYPE_PRECISION (enumtype);
+	    }
+	}
+
       for (itk = (use_short_enum ? itk_char : itk_int);
            itk != itk_none;
            itk++)

gcc/testsuite/ChangeLog

+2016-05-19  Bernd Edlinger  <bernd.edlinger@hotmail.de>
+
+	* c-c++-common/pr69669.c: Check the used mode.
+
 2016-05-19  Maxim Ostapenko  <m.ostapenko@samsung.com>
 
 	PR sanitizer/64354

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

 /* PR c/69669 */
 /* { dg-do compile } */
+/* { dg-options "-fdump-rtl-final" } */
 
 enum __attribute__((mode(QI))) E { F = 1 };
 
@@ -8,3 +9,5 @@ foo (enum E *x, int y)
 {
   *x = (enum E) y;
 }
+
+/* { dg-final { scan-rtl-dump-times "mem:QI" 1 "final" } } */