2014-10-20  Vincent Celier  <celier@adacore.com>

	* prj-attr.adb: New project level attribute Runtime.
	* prj-conf.adb (Get_Project_Runtimes): New procedure to get
	the attributes Runtime declared in the main project, to use
	in auto-configuration.
	(Get_Or_Create_Configuration_File): Call Get_Project_Runtimes.
	* prj-proc.adb (Runtime_Defaults): New table to store
	the default values of attributes Runtime (<language>).
	(Set_Default_Runtime_For): New procedure to store the default
	value of a Runtime (<language>) in table Runtime_Defaults.
	(Expression): Use the value stored in table Runtime_Defaults as
	the default for Runtime (<language>).
	* prj-proc.ads (Set_Default_Runtime_For): New procedure.
	* prj.ads (Attribute_Default_Value): New enumerated value
	Runtime_Value.

2014-10-20  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch3.adb (Analyze_Object_Declaration): If the type is
	an unconstrained unchecked_union type, rewrite declaration
	as a renaming to prevent attempt to retrieve non- existent
	discriminants from expression.

2014-10-20  Ed Schonberg  <schonberg@adacore.com>

	* gnat_ugn.texi: Minor reformatting.

From-SVN: r216479