Complain if -[DIU] is given an empty argument. (Like many compilers over the years, we don't accept the argument appearing in the next argv word.) Warn about this in the man page too.

#	$NetBSD$

PROG=	tradcpp
SRCS=	main.c \
	files.c directive.c eval.c macro.c output.c \
	place.c array.c utils.c
WARNS=	5

#DBG=-g

.include <bsd.prog.mk>