ada-tree.h: (DECL_RENAMING_GLOBAL_P): New predicate.

2005-03-17  Eric Botcazou  <ebotcazou@adacore.com>

	* ada-tree.h: (DECL_RENAMING_GLOBAL_P): New predicate.
	(DECL_RENAMED_OBJECT): New accessor macro.
	(SET_DECL_RENAMED_OBJECT): New setter macro.

	* decl.c (gnat_to_gnu_entity) <E_Variable>: Stabilize the renamed
	object in all cases.  Attach the renamed object to the VAR_DECL.
	(gnat_to_gnu_field): Do not lift the record wrapper if the size of the
	field is not prescribed.

	* misc.c (gnat_handle_option): Handle -gnatO separately.
	(gnat_print_decl) <VAR_DECL>: New case.
	Print the DECL_RENAMED_OBJECT node.

	* lang.opt:  Declare separate -gnatO option.

	* trans.c (tree_transform) <N_Identifier>: If the object is a renaming
	pointer, replace it with the renamed object.
	<N_Validate_Unchecked_Conversion>: Warn for a conversion to a fat
	pointer type if the source is not a fat pointer type whose underlying
	array has the same non-zero alias set as that of the destination array.

From-SVN: r96660