cp/:
	* call.c (avoid_sign_compare_warnings): New static function.
	(build_new_op): Call it.
	* typeck.c (cp_build_binary_op): Don't call warn_sign_compare if
	TREE_NO_WARNING is set on either operand.
testsuite/:
	* g++.dg/warn/Wsign-compare-3.C: New testcase.

From-SVN: r148952