2010-09-09 Javier Miranda <miranda@adacore.com>

	* sem_ch3.adb (Derive_Subprogram): The code that checks if a
	dispatching primitive covers some interface primitive is incomplete.
	Replace such code by the invocation of a new subprogram that provides
	this functionality.
	* sem_ch6.ads (Is_Interface_Conformant): Add missing documentation.
	* sem_ch6.adb (Check_Missing_Return): Minor reformating
	(Check_Convention): Complete if-statement conditition when reporting
	errors (to avoid assertion failure).
	* sem_ch13.adb (Make_Null_Procedure_Specs): This routine was previously
	located in exp_ch3. Relocated inside Analyze_Freeze_Entity.
	(Analyze_Freeze_Entity): Invoke routine that adds the spec of non
	overridden null interface primitives.
	* sem_type.adb (Is_Ancestor): If the parent of the partial view of a
	private type is an interface then use the parent of its full view to
	climb to its ancestor type.
	* sem_disp.ads, sem_disp.adb (Covers_Some_Interface): New subprogram.
	(Check_Dispatching_Operation): Extend assertion to handle wrappers of
	null interface primitives.
	(Is_Null_Interface_Primitive): New subprogram.
	* exp_ch3.adb (Make_Null_Procedure_Specs): Removed.
	(Expand_Freeze_Record_Type): Do not generate specs of null interface
	subprograms because they are now generated by Analyze_Freeze_Entity.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@164059 138bc75d-0d04-0410-961f-82ee72b054a4

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