PR c++/62153
	* doc/invoke.texi: Document -Wbool-compare.
c-family/
	* c-common.c (maybe_warn_bool_compare): New function.
	* c-common.h (maybe_warn_bool_compare): Declare.
	* c.opt (Wbool-compare): New option.
c/
	* c-typeck.c (build_binary_op): If either operand of a comparison
	is a boolean expression, call maybe_warn_bool_compare.
cp/
	* call.c (build_new_op_1): Remember the type of arguments for
	a comparison.  If either operand of a comparison is a boolean
	expression, call maybe_warn_bool_compare.
testsuite/
	* c-c++-common/Wbool-compare-1.c: New test.

From-SVN: r214183