* c-common.h (do_warn_double_promotion): Declare.

	* c-common.h (do_warn_double_promotion): Declare.
	* c-common.c (do_warn_double_promotion): Define.

	* c-typeck.c (do_warn_double_promotion): Remove.
	* doc/invoke.texi (-Wdouble-promotion): Note available for C++ and
	Objective-C++ too.

	* typeck.c (cp_build_binary_op): Call do_warn_double_promotion.
	* call.c (build_conditional_expr): Likewise.
	(convert_arg_to_ellipsis): Likewise.

	* g++.dg/warn/Wdouble-promotion.C: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@163925 138bc75d-0d04-0410-961f-82ee72b054a4