2008-04-08  Robert Dewar  <dewar@adacore.com>

	* back_end.adb: Remove Big_String_Ptr declarations (now in Types)

	* errout.adb: Remove Big_String_Ptr declarations (now in Types)
	Change name Is_Style_Msg to Is_Style_Or_Info_Msg

	* fmap.adb: Remove Big_String declarations (now in Types)
	(No_Mapping_File): New Boolean global variable
	(Initialize): When mapping file cannot be read, set No_Mapping_File to
	False.
	(Update_Mapping_File): Do nothing if No_Mapping_File is True. If the
	tables were empty before adding entries, open the mapping file
	with Truncate = True, instead of delete/re-create.

	* fname-sf.adb: Remove Big_String declarations (now in Types)

	* s-strcom.adb, g-dyntab.ads, g-table.ads, s-carsi8.adb,
        s-stalib.ads, s-carun8.adb: Add zero size Storage_Size clauses for big
	pointer types

	* table.ads: Add for Table_Ptr'Storage_Size use 0

	* types.ads: Add Big_String declarations
	Add Size_Clause of zero for big pointer types

From-SVN: r134022