[multiple changes]

[multiple changes]

2012-10-01  Robert Dewar  <dewar@adacore.com>

	* checks.adb (Minimize_Eliminate_Overflow_Checks): Changes
	for exponentiation.
	* exp_ch4.adb (Expand_N_Op_Expon): Changes for Minimize/Eliminate
	overflow checks.
	* s-bignum.adb (Compare): Fix bad precondition.

2012-10-01  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch3.adb (Build_Derived_Record_Type): If the derived
	type has new discriminantss that constrain inherited ones, use
	the discriminant type in the original declaration to check for
	conformance, because in the presence of array components with a
	smaller range that are constrained by the origina discriminant,
	the compiler will have created a narrower subtype for that
	discriminant.

From-SVN: r191919