[COMMITTED] ada: Fix debug info for aliased packed array with unconstrained nominal subtype

[COMMITTED] ada: Fix debug info for aliased packed array with unconstrained nominal subtype

[Marc Poulhiès]

From: Eric Botcazou <ebotcazou@adacore.com>

The front-end now rewrites it as a renaming when it is initialized with a
function call and the same processing must be applied in the renaming case
as in the regular case for this kind of special objects.

gcc/ada/

	* gcc-interface/decl.cc (gnat_to_gnu_entity) <E_Variable>: Apply the
	specific rewriting done for an aliased object with an unconstrained
	array nominal subtype in the renaming case too.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/gcc-interface/decl.cc | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/gcc/ada/gcc-interface/decl.cc b/gcc/ada/gcc-interface/decl.cc
index 20ab185d577..95fa508c559 100644
--- a/gcc/ada/gcc-interface/decl.cc
+++ b/gcc/ada/gcc-interface/decl.cc
@@ -1145,6 +1145,18 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, bool definition)
 		   the entity as indirect reference to the renamed object.  */
 		if (Materialize_Entity (gnat_entity))
 		  {
+		    /* If this is an aliased object with an unconstrained array
+		       nominal subtype, we make its type a thin reference, i.e.
+		       the reference counterpart of a thin pointer, exactly as
+		       we would have done in the non-renaming case below.  */
+		    if (Is_Constr_Subt_For_UN_Aliased (gnat_type)
+			&& Is_Array_Type (gnat_und_type)
+			&& !type_annotate_only)
+		      {
+			tree gnu_array
+			  = gnat_to_gnu_type (Base_Type (gnat_type));
+			gnu_type = TYPE_OBJECT_RECORD_TYPE (gnu_array);
+		      }
 		    gnu_type = build_reference_type (gnu_type);
 		    const_flag = true;
 		    volatile_flag = false;
-- 
2.42.0