2008-04-08  Robert Dewar  <dewar@adacore.com>
	    Gary Dismukes  <dismukes@adacore.com>
	    Javier Miranda  <miranda@adacore.com>
	    Ed Schonberg  <schonberg@adacore.com>

	* fe.h: Remove global Optimize_Alignment flag, no longer used

	* layout.adb: Test Optimize_Alignment flags rather than global switch

	* lib.ads, lib.adb: New OA_Setting field in library record

	* lib-load.adb: New OA_Setting field in library record

	* lib-writ.ads, lib-writ.adb (Collect_Withs, Write_With_Lines): Place
	units mentioned in limited_with_ clauses in the ali file, with an
	'Y' marker.
	New Ox fields in U line

	* opt.adb: New flag Optimize_Alignment_Local
	(Check_Policy_List[_Config]): New flags

	* opt.ads (Invalid_Value_Used): New flag
	New switch Optimize_Alignment_Local
	(Warn_On_Parameter_Order): New flag
	(Check_Policy_List[_Config]): New flags

	* ali.ads, ali.adb: Add indicator 'Y' to mark mark the presence of
	limited_with clauses.
	New data structures for Optimize_Alignment

	* bcheck.adb (Check_Consistent_Restriction_No_Default_Initialization):
	New procedure
	(Check_Consistent_Optimize_Alignment): Rework for new structure
	(Check_Consistent_Restrictions): Fix incorrect error message

	sem_ch10.adb (Decorate_Tagged_Type): Set the Parent field of a newly
	created class-wide type (to the Parent field of the specific type).
	(Install_Siblings): Handle properly private_with_clauses on subprogram
	bodies and on generic units.
	(Analyze_With_Clause, Install_Limited_Withed_Unit): Guard against an
	illegal limited_with_clause that names a non-existent package.
	(Check_Body_Required): Determine whether a unit named a limited_with
	clause needs a body.
	(Analyze_Context): A limited_with_clause is illegal on a unit_renaming.
	Capture Optimize_Alignment settings to set new OA_Setting field in
	library record.
	(Build_Limited_Views): Include task and protected type declarations.

	* sem_ch3.ads, sem_ch3.adb (Analyze_Object_Declaration): Handle the
	case of a possible constant redeclaration where the current object is
	an entry index constant.
	(Analyze_Object_Declaration): Generate an error in case of CPP
	class-wide object initialization.
	(Analyze_Object_Declaration): Add extra information on warnings for
	declaration of unconstrained objects.
	(Access_Type_Declaration): Set Associated_Final_Chain to Empty, to avoid
	conflicts with the setting of Stored_Constraint in the case where the
	access type entity has already been created as an E_Incomplete_Type due
	to a limited with clause.
	Use new Is_Standard_Character_Type predicate
	(Analyze_Object_Declaration): Apply access_constant check only after
	expression has been resolved, given that it may be overloaded with
	several access types.
	(Constant_Redeclaration): Additional legality checks for deferred
	constant declarations tha involve anonymous access types and/or null
	exclusion indicators.
	(Analyze_Type_Declaration): Set Optimize_Alignment flags
	(Analyze_Subtype_Declaration): Ditto
	(Analyze_Object_Declaration): Ditto
	(Analyze_Object_Declaration): Don't count tasks in generics
	Change name In_Default_Expression      => In_Spec_Expression
	Change name Analyze_Per_Use_Expression => Preanalyze_Spec_Expression
	Change name Pre_Analyze_And_Resolve    => Preanalyze_And_Resolve
	(Process_Discriminants): Additional check for illegal use of default
	expressions in access discriminant specifications in a type that is not
	explicitly limited.
	(Check_Abstract_Overriding): If an inherited function dispaches on an
	access result, it must be overridden, even if the type is a null
	extension.
	(Derive_Subprogram): The formals of the derived subprogram have the
	names and defaults of the parent subprogram, even if the type is
	obtained from the actual subprogram.
	(Derive_Subprogram): In the presence of interfaces, a formal of an
	inherited operation has the derived type not only if it descends from
	the type of the formal of the parent operation, but also if it
	implements it. This is relevant for the renamings created for the
	primitive operations of the actual for a formal derived type.
	(Is_Progenitor): New predicate, to determine whether the type of a
	formal in the parent operation must be replaced by the derived type.

	* sem_util.ads, sem_util.adb (Has_Overriding_Initialize): Make
	predicate recursive to handle components that have a user-defined
	Initialize procedure. Handle controlled derived types whose ancestor
	has a user-defined Initialize procedured.
	(Note_Possible_Modification): Add Sure parameter, generate warning if
	sure modification of constant
	Use new Is_Standard_Character_Type predicate
	(Find_Parameter_Type): when determining whether a protected operation
	implements an interface operation, retrieve the type of the formal from
	the entity when the formal is an access parameter or an
	anonymous-access-to-subprogram.
	Move Copy_Parameter_List to sem_util, for use when building stubbed
	subprogram bodies.
	(Has_Access_Values): Tagged types now return False
	(Within_HSS_Or_If): New procedure
	(Set_Optimize_Alignment_Flags): New procedure
	Change name In_Default_Expression      => In_Spec_Expression
	Change name Analyze_Per_Use_Expression => Preanalyze_Spec_Expression
	Change name Pre_Analyze_And_Resolve    => Preanalyze_And_Resolve

From-SVN: r134011