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Re: How to capture a set of recurring rules?

From: Paul Smith
Subject: Re: How to capture a set of recurring rules?
Date: Tue, 02 Feb 2010 00:19:21 -0500

On Mon, 2010-02-01 at 22:09 -0600, Peng Yu wrote:
> Suppose that I use the following rule pattern a lot in my makefile,
> where <filename> has to be the same in each block of the three rules.
> <some1> <some2> ... <some_n> can be any files.
> all: <filename>.RData
> clean: <filename>.RData
>       $(RM) $^
> <filename>.RData: <filename>.R <some1> <some2> ... <some_n>
>       Rscript $<

You can use $(eval ...) as long as you can require a new-enough version
of GNU make.

define special-rule
all: $1.RData

clean $1.RData
        $$(RM) $$^

$1.RData: $1.R $2 $3 $4 $5 $6 $7 $8 $9
        Rscript $$<

$(eval $(call special-rule,xxx,a.txt,b.txt))
$(eval $(call special-rule,uuu,x.txt,y.txt,z.txt))

Note that this has the disadvantage that if you have >8 prerequisites it
will fail.  You can increase this as much as you want but I can't think
of a way, offhand, to make it foolproof.

 Paul D. Smith <address@hidden>          Find some GNU make tips at:            
 "Please remain calm...I may be mad, but I am a professional." --Mad Scientist

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