2008-03-26  Robert Dewar  <dewar@adacore.com>

	* ali.ads, ali.adb (Optimize_Alignment_Setting): New field in ALI record

	* bcheck.adb (Check_Consistent_Optimize_Alignment): New procedure

	* debug.adb: Add debug flags d.r and d.v
	Add debug flag .T (Optimize_Alignment (Time))
	Add debug flag .S (Optimize_Alignment (Space))

	* freeze.adb (Freeze_Record_Type): Set OK_To_Reorder_Components
	depending on setting of relevant debug flags.
	Replace use of Warnings_Off by Has_Warnings_Off
	(Freeze_Entity): In circuit for warning on suspicious convention
	actuals, do not give warning if subprogram has same entity as formal
	type, or if subprogram does not come from source.
	(Freeze_Entity): Don't reset Is_Packed for fully rep speced record
	if Optimize_Alignment set to Space.

	* frontend.adb: Add call to Sem_Warn.Initialize
	Add call to Sem_Warn.Output_Unused_Warnings_Off_Warnings
	Reset Optimize_Alignment mode from debug switches .S and .T

	* layout.adb (Layout_Composite_Object): Rewritten for
	Optimize_Aligment pragma.

	* lib-writ.ads, lib-writ.adb: New Ox parameter for Optimize_Alignment
	mode.

	* opt.ads, opt.adb: (Optimize_Alignment): New global switch

	* par-prag.adb (N_Pragma): Chars field removed, use Chars
	(Pragma_Identifier (..  instead, adjustments throughout to accomodate
	this change. Add entry for pragma Optimize_Alignment

	* sem_prag.adb (N_Pragma): Chars field removed, use Chars
	(Pragma_Identifier (..
	instead, adjustments throughout to accomodate this change.
	(Process_Compile_Time_Warning_Or_Error): Use !! for generated msg
	(Favor_Top_Level): Use new function Is_Access_Subprogram_Type
	Add implementation of pragma Optimize_Alignment

From-SVN: r133549