decl.c (gnat_to_gnu_entity): For an object at global level with unconstrained nominal subtype and a...

* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: For an object at
	global level with unconstrained nominal subtype and a non-fixed size,
	make a variable for the size.

From-SVN: r187666

gcc/ada/ChangeLog

@@ -1,3 +1,9 @@
+2012-05-18  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: For an object at
+	global level with unconstrained nominal subtype and a non-fixed size,
+	make a variable for the size.
+
 2012-05-15  Andris Pavenis  <andris.pavenis@iki.fi>
 
 	PR ada/52494

gcc/ada/gcc-interface/decl.c

@@ -760,6 +760,14 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
 		gnu_size = max_size (TYPE_SIZE (gnu_type), true);
 		mutable_p = true;
 	      }
+
+	    /* If we are at global level and the size isn't constant, call
+	       elaborate_expression_1 to make a variable for it rather than
+	       calculating it each time.  */
+	    if (global_bindings_p () && !TREE_CONSTANT (gnu_size))
+	      gnu_size = elaborate_expression_1 (gnu_size, gnat_entity,
+						 get_identifier ("SIZE"),
+						 definition, false);
 	  }
 
 	/* If the size is zero byte, make it one byte since some linkers have

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2012-05-18  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gnat.dg/specs/lto12.ads: New test.
+	* gnat.dg/specs/lto12_pkg.ads: New helper.
+
 2012-05-18  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/53346

gcc/testsuite/gnat.dg/specs/lto12.ads

@@ -0,0 +1,10 @@
+-- { dg-do compile }
+-- { dg-options "-flto" { target lto } }
+
+with Lto12_Pkg; use Lto12_Pkg;
+
+package Lto12 is
+
+  C : constant R := F;
+
+end Lto12;

gcc/testsuite/gnat.dg/specs/lto12_pkg.ads

@@ -0,0 +1,14 @@
+-- { dg-excess-errors "cannot generate code" }
+
+package Lto12_Pkg is
+
+  type R (Kind  : Boolean := False) is record
+    case Kind is
+      when True => I : Integer;
+      when others => null;
+    end case;
+  end record;
+
+  function F return R;
+
+end Lto12_Pkg;