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From: joel@pyr.gatech.EDU (Joel Rives)
Newsgroups: comp.windows.x
Subject: Re: Multiple targets with one source
Message-ID: <4306@pyr.gatech.EDU>
Date: Wed, 28-Oct-87 11:41:13 EST
Article-I.D.: pyr.4306
Posted: Wed Oct 28 11:41:13 1987
Date-Received: Sat, 31-Oct-87 08:05:45 EST
References: <2496@calmasd.GE.COM>
Reply-To: joel@pyr.UUCP (Joel Rives)
Organization: Office of Computing Services, Georgia Tech
Lines: 43


There is no need to rewrite the rules for 'make' to do what you
are seeking to do. First, it is only necissary to remove object files
which will be using an include file that has been altered. Secondly,
it is possible to have entries in your 'Makefile' -- one for each
system that you wish to rebuild 'X' for such that it saves and retrieves
the appropriate object files from specific subdirectories. Here's an 
exmaple that I have just thrown together of the top of my head. There is
probably a more efficient way to do this but it shows the general idea.

#
#	Makefile example
#

CFLAGS = -g
OBJS = ( list of object files)

vax:	setvax $(OBJDIR)/$(OBJS)
	cc $(CFLAGS) -o X $(OBJDIR)/$(OBJS)

setvax:	vaxobj/$(OBJS)
	OBJDIR = vaxobj

sun:	setsun $(OBJDIR)/$(OBJS)
	cc $(CFLAGS) -o X $OBJDIR)/$(OBJS)

setsun:	sunobj/$(OBJS)
	OBJDIR = sunobj

foo.o:	foo.c bar.h
	cc $(CFLAGS) foo.c
	mv foo.o $(OBJDIR)

============================================================

					Joel Rives


-- 
		The thief
		  Left it behind--
		    The moon at the window.
						-Ryokan