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From: bww@k.gp.cs.cmu.edu (Bradley White)
Newsgroups: comp.bugs.sys5,comp.unix.wizards
Subject: Re: make bug
Summary: make substitutions
Message-ID: <3984@pt.cs.cmu.edu>
Date: 8 Jan 89 21:06:55 GMT
References: <502@Aragorn.dde.uucp> <904@philmds.UUCP> <488@targon.UUCP>
Organization: Carnegie-Mellon University, CS/RI
Lines: 66

In article <488@targon.UUCP>, andre@targon.UUCP (andre) writes:
> One thing to ponder, should make be able to handle this?
> 
> STR=h w
> HI=hello
> TEXT=STR
> H=h
> HELLO=$HI
> 
> all:
> 	echo $($($TEXT:w=world):$H=$HELLO)
> 
> And the result of this is:
> 	echo :h=hELLO)
> 

Changing the last line to read

	echo $($TEXT:w=world):$H=$HELLO)

as I think you intended, the CMU CS version of make says:

	% make -n
	echo :h=hELLO)

Of course, this isn't very interesting:  $T is null, $(EXT) is null,
(so the substitution doesn't apply), and that concatenated with the
string ":h=hELLO)" simply gives that string.

Something slightly more challenging is:

	echo $($(TEXT):w=$(HELLO))

	% make -n
	echo h hI

And something a lot more challenging (the syntax should hopefully be
self-explanatory):

	PROGS		= foo bar
	OFILES		= $(PROGS/*/$(&_OFILES?$(&_OFILES):&.o))
	foo_OFILES	= foo1.o foo2.o

	all:
		echo $(OFILES)

	% make -n
	echo foo1.o foo2.o bar.o

Using such powerful translations has allowed us to create a fully
parameterized set of rules, that is included by every Makefile in the
system, and that provides the standard target names "all", "install",
"clean", and "lint".  For example, here is our Makefile for /bin/sh:

IDIR			= /bin/

PROGRAMS		= sh
OFILES			= setbrk.o builtin.o blok.o stak.o cmd.o\
			  fault.o main.o word.o string.o name.o args.o\
			  xec.o service.o error.o io.o print.o macro.o\
			  expand.o ctype.o msg.o

include ../../Makefile-common
-- 
Bradley White <bww@cs.cmu.edu>         +1-412-268-3060
CMU Computer Science Department  40 26'33"N 79 56'48"W
--