From:	ian_d AT elric DOT accuris DOT ie (Ian Dunbarr)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: How do I do this with make?
Date:	16 Jan 1998 18:17:16 GMT
Organization:	Telecom Internet, Dublin, Ireland.
Lines:	93
Message-ID:	<slrn6bv9ak.flc.ian_d@elric.accuris.ie>
References:	<69nuae$492$1 AT star DOT cs DOT vu DOT nl>
NNTP-Posting-Host:	159.134.174.252
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

In article <69nuae$492$1 AT star DOT cs DOT vu DOT nl>, Ruiter de M wrote:
>I think this is not DJGPP- or DOS-specific, but I hope you are kind
>enough to answer my question here anyway. :-)
>
>I want to do, in a makefile:
>
># -*- makefile -*-
>10/%.enc: 10/%.jpg
>	same commands
>20/%.enc: 20/%.jpg
>	same commands
>...
>90/%.enc: 90/%.jpg
>	same commands
>
>That is, the commands depend of course on $^ or $@, so strictly they
>are not the same. What I hope to do is to use ONE dependancy in ONE
>makefile in ONE run of `make' to handle this, because the names of the
>dirs can change and I want them in a variable. I have tried all sorts
>of things but it was not possible.
>
>For instance:
>
>%/a.enc %/b.enc ....: %/a.jpg %/b.jpg ....
>	same commands
>
>This doesn't work (I know this dependancy means something else, every
>.enc depends on all .jpg's now, but that's not too important), because
>somehow the %/ is `stripped off' the %/*.jpg somehow. The (make.info)
>documentation says something like that, but I'm not sure what and why.
>
>Any ideas?
>-- 
>Groeten, Michel.        http://www.cs.vu.nl/~mdruiter
> \----/==\----/
>  \  /    \  /          "You know, Beavis, you need things that suck,
>   \/      \/           to have things that are cool", Butt-Head.

I'm not sure if I've understood what you are trying to do properly, but here's
my attempt anyway. Maybe it will help even if it's not exactly what you want.

Ian.

##############################################################################
# Makefile for .enc files from .jpg files in some arbitrary directory
#
# By Ian Dunbar
##############################################################################

##############################################################################
# Set the default directory (override this on the make command line)
# for example:
# make "MYDIR=20"
# should do the make in dir 20. (does the command line stuff work in dos?)
##############################################################################
MYDIR=10

##############################################################################
# The source files for the enc files
##############################################################################
JSRCS= a.jpg b.jpg

##############################################################################
# prepend the direcory name and a /
# so a.jpg goes to 10/a.jpg etc...
##############################################################################
JSRCS=$(JSRCS/^/${MYDIR}\//)

##############################################################################
# The final format for the files
# replace .jpg with .enc
##############################################################################
JFINAL=$(JSRCS:.jpg=.enc)

##############################################################################
# Suffix rules. How to compile convert from jpg to enc
# 
# REM: replace the dummy command with whatever is the proper command
##############################################################################
.SUFFIXES: .jpg .enc
.jpg.enc:
	dummy.exe $< 

##############################################################################
# Set the target dependency
##############################################################################
target: $(JFINAL)

##############################################################################
# end of makefile
##############################################################################

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