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[Ada] Inheritance of variables in extending projects


A variable V declared in a project A that is extended by a project B is
now inherited in project B; it can be referenced as V in project B or as
B.V in any other project that imports B.

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

2014-07-30  Vincent Celier  <celier@adacore.com>

	* prj-proc.adb (Imported_Or_Extended_Project_From): New Boolean
	parameter No_Extending, defaulted to False. When No_Extending
	is True, do not look for an extending project.
	(Expression): For a variable reference that is not for the current
	project, get its Id calling Imported_Or_Extended_Project_From
	with No_Extending set to True.
	* prj-strt.adb (Parse_Variable_Reference): If a referenced
	variable is not found in the current project, check if it is
	defined in one of the projects it extends.

Attachment: difs
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