Path: utzoo!attcan!uunet!lll-winken!ames!haven!purdue!decwrl!hplabs!hpda!hpcuhb!hp-ses!hpcea!hpausla!jcl
From: jcl@hpausla.HP.COM (Jeff Laing)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Make question (was MPW vs Lightspeed)
Message-ID: <2580012@hpausla.HP.COM>
Date: 26 Jan 89 22:20:40 GMT
References: <7260@csli.STANFORD.EDU>
Organization: HP Australian Software Operation
Lines: 20

Nathan Wilson (wilson@csli.STANFORD.EDU) writes in comp.sys.mac.programmer:
> 	A second question:  Is it ever necessary to compile a file
> that only depends on files that haven't changed?  That is A depends
> on B.  B depends on C.  I change C.  A does not depend on C.  Do I
> need to recompile A?

Maybe.  Consider the following (nonsensical but not unreasonable, or unlikely)

/* a.c */
#include "b.h"
static myBuff[BUFSIZ];

/* b.h */
#include "c.h"
#define BUFSIZ SYSBUFSIZ-4

/* c.h */
#define SYSBUFIZ 200

Change the definition in C and the effect ripples right up to A.