2013-04-25  Robert Dewar  <dewar@adacore.com>

	* gnat_rm.texi: Document Reason argument for pragma Warnings.
	* par-prag.adb: Handle Reason parameter for pragma Warnings.
	* sem_prag.adb (Analyze_Pragma, case Warnings): Allow Reason argument.
	* snames.ads-tmpl (Name_Reason): New name entry.

From-SVN: r198295