2014-07-31  Robert Dewar  <dewar@adacore.com>

	* exp_ch5.adb, freeze.adb, exp_ch3.adb: Minor comment correction.
	* s-arit64.adb: Minor reformatting.

2014-07-31  Robert Dewar  <dewar@adacore.com>

	* gnat1drv.adb (Adjust_Global_Switches): Default for overflow
	checking is enabled except in GNAT_Mode.
	* switch-c.adb (Scan_Front_End_Switches): Implement -gnato0
	(suppress overflow checks).

From-SVN: r213327