trans.c (Identifier_to_gnu): Do not return initializers of aggregate types that contain a placeholder.

* gcc-interface/trans.c (Identifier_to_gnu): Do not return initializers
	of aggregate types that contain a placeholder.

From-SVN: r172209

gcc/ada/ChangeLog

@@ -1,3 +1,8 @@
+2011-04-08  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gcc-interface/trans.c (Identifier_to_gnu): Do not return initializers
+	of aggregate types that contain a placeholder.
+
 2011-04-08  Nathan Froyd  <froydnj@codesourcery.com>
 
 	* gcc-interface/utils.c (handle_sentinel_attribute): Don't use

gcc/ada/gcc-interface/trans.c

@@ -1058,10 +1058,14 @@ Identifier_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p)
 
   /* If we have a constant declaration and its initializer, try to return the
      latter to avoid the need to call fold in lots of places and the need for
-     elaboration code if this identifier is used as an initializer itself.  */
+     elaboration code if this identifier is used as an initializer itself.
+     Don't do it for aggregate types that contain a placeholder since their
+     initializers cannot be manipulated easily.  */
   if (TREE_CONSTANT (gnu_result)
       && DECL_P (gnu_result)
-      && DECL_INITIAL (gnu_result))
+      && DECL_INITIAL (gnu_result)
+      && !(AGGREGATE_TYPE_P (TREE_TYPE (gnu_result))
+	   && type_contains_placeholder_p (TREE_TYPE (gnu_result))))
     {
       bool constant_only = (TREE_CODE (gnu_result) == CONST_DECL
 			    && !DECL_CONST_CORRESPONDING_VAR (gnu_result));

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2011-04-08  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gnat.dg/aggr17.adb: New test.
+	* gnat.dg/aggr18.adb: Likewise.
+
 2011-04-08  Michael Matz  <matz@suse.de>
 
 	PR middle-end/48389

gcc/testsuite/gnat.dg/aggr17.adb

@@ -0,0 +1,28 @@
+-- { dg-do compile }
+-- { dg-options "-gnatws" }
+
+procedure Aggr17 is
+
+   type Enum is (A, B);
+
+   type Rec (D : Enum := Enum'First) is record
+      case D is
+         when A => X : Integer;
+         when B => null;
+      end case;
+   end record;
+   for Rec'Size use 128;
+   pragma Volatile (Rec);
+
+   type Config_T (D : Enum := Enum'First) is record
+      N : Natural;
+      R : Rec (D);
+   end record;
+
+   C : constant Config_T := (D => A, N => 1, R => (D => A, X => 0));
+
+   type Arr is array (Natural range 1 .. C.N) of Boolean;
+
+begin
+   null;
+end;

gcc/testsuite/gnat.dg/aggr18.adb

@@ -0,0 +1,28 @@
+-- { dg-do compile }
+-- { dg-options "-gnatws" }
+
+procedure Aggr18 is
+
+   type Enum is (A, B);
+
+   type Rec (D : Enum := Enum'First) is record
+      case D is
+         when A => X : Integer;
+         when B => null;
+      end case;
+   end record;
+   for Rec'Size use 128;
+   pragma Volatile (Rec);
+
+   type Config_T (D : Enum := Enum'First) is record
+      N : Natural;
+      R : Rec (D);
+   end record;
+
+   C : Config_T := (D => A, N => 1, R => (D => A, X => 0));
+
+   type Arr is array (Natural range 1 .. C.N) of Boolean;
+
+begin
+   null;
+end;