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From: vrm@cerc.wvu.wvnet.edu (Vasile R. Montan)
Newsgroups: comp.unix.questions
Subject: Re: Help with Makefile
Summary: Using Pattern Matching Rules
Message-ID: <217@cerc.wvu.wvnet.edu.edu>
Date: 6 Sep 89 17:41:38 GMT
References: <20767@adm.BRL.MIL>
Sender: news@cerc.wvu.wvnet.edu
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From: Micky Liu <micky@cunixc.cc.columbia.edu>
> 
> 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
> 
> But I only want to keep one Makefile in the my /src directory.
> I have already made a method to determine the architecture and
> then it invokes itself with the proper flags.  The problem is
> that I cannot seem to get the implicit rules to work anymore.
> 
   On the SUN machines, you can use a pattern matching rule:

$(DEST)/%.o: %.c
        $(COMPILE.c)  -o $@ $<

where DEST is somehow set to the appropriate directory (ex. sun4) and
COMPILE.c is as defined in /usr/include/make/default.mk.

The rule to create your program would be:

$(PROGRAM):     $(OBJS:%=$(DEST)/%) $(LIBS)

   However, this does not work on any of the versions of make on the
other platforms we are working on.

PS:
Micky,
  I would be interested in any email feedback that you may have
gotten from your query.  Also your method for determining what
architecture you are compiling on would be interesting.  I tried to
send you email, but it bounced back.

-- Vasile