Path: utzoo!attcan!telly!lethe!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!radar!cadillac!pebbles!ned
From: ned@pebbles.cad.mcc.com (Ned Nowotny)
Newsgroups: comp.unix.programmer
Subject: Re: mkdep program for SysV (Xenix/Unix)
Message-ID: <14203@cadillac.CAD.MCC.COM>
Date: 21 Dec 90 19:17:02 GMT
References: <1990Dec13.010143@cs.yale.edu> <1990Dec14.023842.21164@robobar.co.uk>
Sender: news@cadillac.CAD.MCC.COM
Reply-To: ned%cad@MCC.COM (Ned Nowotny)
Organization: MCC CAD Program, Austin, TX
Lines: 34

In article <1990Dec14.023842.21164@robobar.co.uk> ronald@robobar.co.uk (Ronald S H Khoo) writes:
>One fast and accurate way to make dependencies for makefiles is to use gcc -M.
>(Doug's asking about Xenix/Sys V, so he'd need gcc.  BSD cc has -M doesn't it?)
>
>For example, you could add something like
>
>	depend:
>		sed "/^# DELETE ME/q" Makefile > Makefile.new
>		gcc $(CFLAGS) -M $(OBJS:.o=.c) >> Makefile.new
>		mv Makefile.new Makefile
>
>	# DELETE ME
>

Or,

Makefile.depend: $(SRCS) $(HDRS)
	for src in $(SRCS) ; \
	do \
	    $(CC) $(CFLAGS) -E $${src}             | \
		grep '^# *1 '                      | \
		sed 's@[^"]*"\([^"]*\)".*@\1 \\@'  | \
		grep -v "$${src}"                  | \
		sort -u                      >> $@ ; \
	    echo  "$${src}" >> $@ ; \
	done


if your compiler does not have -M but does have -E.

Ned Nowotny, MCC CAD Program, Box 200195, Austin, TX  78720  Ph: (512) 338-3715
ARPA: ned@mcc.com                   UUCP: ...!cs.utexas.edu!milano!cadillac!ned
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