2011-10-24  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch12.adb (Earlier): make available globally. If both
	nodes have the same sloc, the freeze node that does not come
	from source is the later one.
	(True_Parent): Make available globally.
	(Previous_Instance): Subsidiary of
	Insert_Freeze_Node_For_Instance, to check whether the generic
	parent of the current instance is declared within a previous
	instance in the same unit or declarative  part, in which case the
	freeze nodes of both instances must appear in order to prevent
	elaboration problems in gigi.
	* sem_ch12.adb (Insert_Freeze_Node_For_Instance): A stub is a
	freeze point, and the freeze node of a preceding instantiation
	must be inserted before it.

2011-10-24  Robert Dewar  <dewar@adacore.com>

	* checks.ads, checks.adb: Add handling of Synchronization_Check
	* debug.adb: Add doc for -gnatd.d and -gnatd.e (disable/enable
	atomic sync).
	* exp_ch2.adb (Expand_Entity_Reference): Set Atomic_Sync_Required
	flag Minor code reorganization.
	* opt.ads (Warn_On_Atomic_Synchronization): New switch.
	* par-prag.adb: Add dummy entries for pragma
	Disable/Enable_Atomic_Synchronization.
	* sem_prag.adb (Process_Suppress_Unsuppress): Handle
	case of Atomic_Synchronization specially (not suppressed
	by All_Checks, cannot be set from Source).
	(Pragma Disable/Enable_Atomic_Synchronization): Add processing.
	* sinfo.ads, sinfo.adb: Add Atomic_Sync_Required flag
	* snames.ads-tmpl: Add entry for Atomic_Synchronization Add
	entry for pragma Disable/Enable_Atomic_Synchronization
	* switch-c.adb: The -gnatp switch does not disable
	Atomic_Synchronization Add -gnatep switch to disable
	Atomic_Synchronization.
	* types.ads: Add entry for Synchronization_Check
	* usage.adb: Add line for -gnated switch
	* warnsw.adb: Settings for Warn_On_Atomic_Synchronization

From-SVN: r180373