re PR ada/46192 (wrong code for renaming of volatile packed array with address clause)

	PR ada/46192
	* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: In the case of a
	renaming, preserve the volatileness through the indirection, if any.

From-SVN: r183365

gcc/ada/ChangeLog

+2012-01-21  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR ada/46192
+	* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: In the case of a
+	renaming, preserve the volatileness through the indirection, if any.
+
 2012-01-14  Andreas Schwab  <schwab@linux-m68k.org>
 
 	* gcc-interface/Makefile.in (OSCONS_EXTRACT): Add

gcc/ada/gcc-interface/decl.c

@@ -1051,6 +1051,14 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
 		   entity is always accessed indirectly through it.  */
 		else
 		  {
+		    /* We need to preserve the volatileness of the renamed
+		       object through the indirection.  */
+		    if (TREE_THIS_VOLATILE (gnu_expr)
+			&& !TYPE_VOLATILE (gnu_type))
+		      gnu_type
+			= build_qualified_type (gnu_type,
+						(TYPE_QUALS (gnu_type)
+						 | TYPE_QUAL_VOLATILE));
 		    gnu_type = build_reference_type (gnu_type);
 		    inner_const_flag = TREE_READONLY (gnu_expr);
 		    const_flag = true;

gcc/testsuite/ChangeLog

+2012-01-21  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gnat.dg/renaming5.ad[sb]: New test.
+
 2012-01-20  Jason Merrill  <jason@redhat.com>
 
 	PR c++/51919

gcc/testsuite/gnat.dg/renaming5.adb

+-- PR ada/46192
+-- Testcase by Rolf Ebert <rolf.ebert.gcc@gmx.de>
+
+-- { dg-do compile }
+-- { dg-options "-O2 -fdump-tree-optimized" }
+
+with System; use System;
+
+package body Renaming5 is
+
+   type Bits_In_Byte is array (0 .. 7) of Boolean;
+   pragma Pack (Bits_In_Byte);
+
+   A : Bits_In_Byte;
+   for A'Address use System'To_Address(16#c0#);
+   pragma Volatile (A);
+
+   B : Bits_In_Byte renames A;
+
+   procedure Proc is
+   begin
+      while B (0) = False loop
+         null;
+      end loop;
+   end;
+
+end Renaming5;
+
+-- { dg-final { scan-tree-dump-times "goto" 2 "optimized" } }
+-- { dg-final { cleanup-tree-dump "optimized" } }

gcc/testsuite/gnat.dg/renaming5.ads

+package Renaming5 is
+
+   procedure Proc;
+
+end Renaming5;