[Ada] Dependencies of virtual extending projects

[Arnaud Charlet <charlet at adacore dot com>]

This change ensures that virtual extending projects generated when processing
an EXTENDS ALL project have a closure that is consistent with that of the
extending project. This is required to build DSA applications with the
gnatdist partitioning tool when RCI units come from some imported project.

No simple test (requires DSA setup).

Tested on x86_64-pc-linux-gnu, committed on trunk

2011-11-23  Thomas Quinot  <quinot@adacore.com>

	* prj-part.adb (Extension_Withs): New global variable,
	contains the head of the list of WITH clauses from the EXTENDS
	ALL projects for which virtual packages are being created.
	(Look_For_Virtual_Projects_For): When recursing through
	an EXTENDS ALL, add the WITH clauses of the extending
	project to Extension_Withs.  When adding a project to the
	Virtual_Hash, record the associated Extension_Withs list.
	(Create_Virtual_Extending_Project): Add a copy of the appropriate
	Extension_Withs to the virtual project.

Attachment: difs
Description: Text document