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From: mayer@rocksanne.UUCP (Jim Mayer)
Newsgroups: comp.unix.wizards
Subject: Re: RCS vs. SCCS and make
Message-ID: <392@rocksanne.UUCP>
Date: Thu, 18-Jun-87 10:42:50 EDT
Article-I.D.: rocksann.392
Posted: Thu Jun 18 10:42:50 1987
Date-Received: Sun, 21-Jun-87 13:52:49 EDT
References: <41@esosun.UUCP> <20393@sun.uucp> <42@loki.esosun.UUCP> <2615@ncoast.UUCP>
Reply-To: mayer@rocksanne.UUCP (Jim Mayer)
Organization: Xerox Corp., Webster, NY
Lines: 70

Another way to use RCS with make is to:

	1. Make all dependencies explicit in the makefile.  The best way
	   is to generate them automatically with one of the "make depends"
	   hacks that are floating around the network.  On 4.3 systems you
	   can use "cc -M" to generate a list of dependencies.
	
	2. Add a ".DEFAULT" entry to your makefile that tries to check
	   out the "to be made" file.

This scheme works even with the use of an RCS directory.  For example,
under 4.3 you can use:

----------------------- START OF EXAMPLE ------------------------
depends:	all your source files
	mv -f Makefile Makefile.orig
	(sed -e '/^#DEPENDS/,$$d' Makefile.orig ; \
		echo "#DEPENDS" ; \
		cc -M $(CFLAGS) $$< \
		) > Makefile

.DEFAULT:
	co -q $@
------------------------ END OF EXAMPLE -------------------------

If you don't have "cc -M", you can replace it with call to the
following shell script (cc -E just invokes "cpp"):

----------------------- START OF SCRIPT ------------------------
#! /bin/sh
#
#	Produce a list of object file dependencies from a list of sources.
#
#	depends [options] name...
#
options=

while true
do
	case "${1-xxx}" in
	-I|-o)
		options="$options $1 ${2?No second argument for -I}"
		shift; shift
		;;
	-*)
		options="$options $1"
		shift
		;;
	*)
		break
		;;
	esac
done

for file in $@
do
	object=`expr "$file" : "\(.*\)\..*"`.o
	if test ".o" = "$object" 
	then
		object="$file.o"
	fi
	cc $options -E $file | sed -n -e "s/^# 1 \"\(.*\)\"\$/$object: \1/p"
done
------------------------ END OF SCRIPT -------------------------

-- Jim
-- 
(Grapevine) mayer.wbst			(Arpa) mayer.wbst@Xerox.com
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