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From: Kemp@DOCKMASTER.NCSC.MIL
Newsgroups: comp.unix.questions
Subject: Re: Help with Makefile
Message-ID: <20501@adm.BRL.MIL>
Date: 4 Aug 89 15:50:20 GMT
Sender: news@adm.BRL.MIL
Lines: 34

micky@cunixc.cc.columbia.edu (Micky Liu) writes:
 > I am trying to build a Makefile for sources that have to be built
 > for different architectures.  So let's say I have my sources at
 > the root and I want to place the objects in their subdirectories
 > under the root like:
 >
 > /src
 > /src/vax
 > /src/sun3
 > /src/sun4
 > [ ... ]
 > Let's say I'm on the vax, and I type make.  It figures out that
 > I'm on the vax and then IT does something like:
 >
 > make CCFLAGS=-DVAX
 >

  I recently got a GREAT suggestion from a Sun employee on how to do
just that, which I posted to sun-spots.  Basically you define variables
(oops - make calls them macros) for each architecture and then select
the macro you need using a nested macro.  For example:

  CFLAGS= $(CFLAGS$(TARGET_ARCH))
  CFLAGS-vax= -Dvax
  CFLAGS-sun3= -f68881

The macro $(TARGET_ARCH) is replaced by a string such as "-sun3", which
is then used as the name of the macro you are using for the particular
architecture.  There is no need for make to invoke itself recursively to
achieve this substitution.

      Dave Kemp <Kemp@dockmaster.ncsc.mil>

 Quote:  "Pave the Bay"   --- bumper sticker on a J-24 at Hampton Yacht Club