[Ada] clean up implementation of limited-with

[Arnaud Charlet <charlet at adacore dot com>]

Tested on i686-linux, committed on mainline.

This patch is a cleanup of the previous implementation of
limited-with clauses.

2005-07-07  Ed Schonberg  <schonberg@adacore.com>
	    Javier Miranda  <miranda@adacore.com>

	* par-load.adb (Load): If a child unit is loaded through a limited_with
	clause, each parent must be loaded as a limited unit as well.

	* sem_ch10.adb (Previous_Withed_Unit): Better name for
	Check_Withed_Unit. Return true if there is a previous with_clause for
	this unit, whether limited or not.
	(Expand_Limited_With_Clause): Do not generate a limited_with_clause on
	the current unit.
	(Is_Visible_Through_Renamings): New local subprogram of install_limited
	_withed_unit that checks if some package installed through normal with
	clauses has a renaming declaration of package whose limited-view is
	ready to be installed. This enforces the check of the rule 10.1.2 (21/2)
	of the current Draft document for Ada 2005.
	(Analyze_Context): Complete the list of compilation units that
	are allowed to contain limited-with clauses. It also contains
	checks that were previously done by Install_Limited_Context_Clauses.
	This makes the code more clear and easy to maintain.
	(Expand_Limited_With_Clause) It is now a local subprogram of
	Install_Limited_Context_Clauses, and contains the code that adds
	the implicit limited-with clauses for parents of child units.
	This functionality was prevously done by Analyze_Context.

	* sem_ch4.adb (Analyze_Selected_Component): Check wrong use of
	incomplete type.

	* sem_ch7.adb (Analyze_Package_Declaration): Check if the package has
	been erroneously named in a limited-with clause of its own context.
	In this case the error has been previously notified by Analyze_Context.

Attachment: difs.7
Description: Text document