2012-10-02 Robert Dewar <dewar@adacore.com>

2012-10-02  Robert Dewar  <dewar@adacore.com>

	* usage.adb, gnat_rm.texi, vms_data.ads: Add entry for
	/OVERFLOW_CHECKS=?? generating -gnato?? for control
	of extended overflow checking.
	* ug_words: Add entry for -gnato?? for /OVERFLOW_CHECKS=??
	* gnat_ugn.texi: Add documentation for -gnato?? for control of overflow
	checking mode.

2012-10-02  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch4.adb (Analyze_Quantified_Expression): If the iterator in
	a quantified expression is statically known to be null (e.g. a
	array with an empty index type) emit a warning.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@191957 138bc75d-0d04-0410-961f-82ee72b054a4