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Posting-Version: version B 2.10.2 9/18/84; site lsuc.UUCP
Path: utzoo!lsuc!dave
From: dave@lsuc.UUCP (David Sherman)
Newsgroups: net.unix
Subject: Re: Problem with Make
Message-ID: <723@lsuc.UUCP>
Date: Fri, 19-Jul-85 13:55:11 EDT
Article-I.D.: lsuc.723
Posted: Fri Jul 19 13:55:11 1985
Date-Received: Fri, 19-Jul-85 16:17:15 EDT
References: <145@iitcs.UUCP> <165@husky.uucp>
Reply-To: dave@lsuc.UUCP (David Sherman)
Organization: Law Society of Upper Canada, Toronto
Lines: 40
Summary: $? and "ar ru"

In article <165@husky.uucp> mj@husky.uucp (Mark A. Johnson) writes:
||
||	A recent letter to net.unix from draughn@iitcs.UUCP 
||	(Mark Draughn) was asking about a problem with make:
||	how do you make objects INSIDE archives depend on their
||	sources (so the objects don't have to keep lying around)?

Here's a usable makefile, stripped down from one of our system makefiles:

CC = cc
CFLAGS = -O

CFILES = file1.c file2.c
OFILES = file1.o file2.o

lib.a: $(CFILES)
	$(CC) $(CFLAGS) $?
	ar ruv lib.a
	rm -f $(OFILES)

all:    $(CFILES)
	$(CC) $(CFLAGS) $(CFILES)
	make mklib
	rm -f $(OFILES)

mklib:
	ar cr lib.a $(OFILES)



This lets make compile those .c files which have later dates
than the archive ($?), and then uses the "ru" feature of ar
to update only those .o files which have later dates than
the archive. Presto.

Dave Sherman
The Law Society of Upper Canada
Toronto
-- 
{  ihnp4!utzoo  pesnta  utcs  hcr  decvax!utcsri  }  !lsuc!dave