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Re: How to generate rules from two lists ?

From: Paul Smith
Subject: Re: How to generate rules from two lists ?
Date: Wed, 26 Mar 2008 12:49:14 -0400

On Wed, 2008-03-26 at 16:58 +0100, Christophe LYON wrote:
>     targets = configure all install
>     deps    = gcc binutils newlib
>     generate = $(1): $(addprefix $(1)-, $(deps))
>     $(foreach target, $(targets), $(call generate, $(target)))
> However, the last line is not expanded as I expected (error "multiple 
> target patterns").
> I *do* understand why (all rules are generated on a single line), but
> is there a way to do what I want? (not especially with the function
> foreach)

You have to use eval:

  $(foreach target,$(targets),$(eval $(call generate,$(target))))

If your rules get much more complex, beware issues around escaping inner
variables (in the generate value).

 Paul D. Smith <address@hidden>       
 "Please remain calm--I may be mad, but I am a professional."--Mad Scientist

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