2009-10-30  Bob Duff  <duff@adacore.com>

	* s-fileio.adb (Errno_Message): Suppress VMS-specific warning.

2009-10-30  Ed Schonberg  <schonberg@adacore.com>

	* sem_case.adb (Check_Choices): Add explanatory message when there are
	missing alternatives when the required range of alternatives is given
	by the base type of the case expression or discriminant in a variant
	part.

	* opt.ads: New flag Warn_On_Overlap, to enable warnings on potentially
	dangerous overlap between actuals in a call, activated by -gnatw.i
	* sem_warn.adb (Set_Dot_Warning_Switch): set flag.
	(Warn_On_Overlapping_Actuals): use new flag.

	* gnat_ugn.texi: Document -gnatw.i, warning on overlapping actuals

2009-10-30  Robert Dewar  <dewar@adacore.com>

	* exp_aggr.adb, exp_ch9.adb: Minor reformatting

From-SVN: r153740