Bootstrapped and regression tested on x86_64-unknown-linux-gnu with
--enable-languages=all,obj-c++ --enable-decimal-float.

OK for trunk and 4.3?

2008-10-25  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR c++/36921
cp/
	* typeck.c (build_x_binary_op): Do not warn for overloaded
	comparison operators that do not return boolean.
testsuite/
	* g++.dg/warn/pr36921.C: New.