Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watnot!watmath!clyde!rutgers!brl-adm!seismo!mcvax!inria!axis!mickey
From: mickey@axis.UUCP
Newsgroups: comp.unix.questions
Subject: make
Message-ID: <210@axis.fr>
Date: Thu, 26-Mar-87 15:41:52 EST
Article-I.D.: axis.210
Posted: Thu Mar 26 15:41:52 1987
Date-Received: Sat, 28-Mar-87 08:32:00 EST
Organization: LERS: soon to be something else!
Lines: 41
Keywords: make, libraries, ar, Schaubl

Sorry about this going to the world but my email bounced.
The original question was how to get to make to update object file
archives (.a's containing .o's) from src aechives (.ar's containing .c's)

The standard version of make (AT&T make) does this, I think it has always
done it but the first time it was documented was with System 5 (perhaps 3
I can't remember the doc for system III).
Basically the trick is to define rules as normal except all objects
should be given as 'arguments' to the archive file - clear as mud eh?
here's an example with just the .o's in an archive:

libwotsit.a:	libwotsit.a(src1.o) libwotsit.a(src2.o)
		echo Done

this example is the simples because make has the default rules for
building archive members (of the .o type) from .c files.
Your example is of the form:


libobj.a:	libobj.a(a.o) libobj.a(b.o)
		echo Wow

libobj.a(a.o):	libsrc.ar(a.c)
		ar x libsrc.ar a.c
		cc -c $(CFLAGS) a.c
		ar r libobj.a a.o
		rm -f a.o

libobj.a(b.o):	libsrc.ar(b.c)
		ar x libsrc.ar b.c
		cc -c $(CFLAGS) b.c
		ar r libobj.a b.o
		rm -f b.o

ps this conforms to SVID VOL 2 pp 360 - 365 (the 'standard' make)
pps i tested this and it works ok, if you find a way of generalising
these rules please let me know as I failed to think of way
(I think that the .a suffix is special to make, .ar is thus not so
special and a rule of the form .a.a confuses me let alone make!