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Re: Feature request: silently overriding existing rules

From: Stefano Lattarini
Subject: Re: Feature request: silently overriding existing rules
Date: Fri, 10 Aug 2012 20:38:08 +0200

Hi David, thanks for the feedback.

On 08/10/2012 07:00 PM, David Boyce wrote:
> Even with GNU make as it stands, couldn't you emit your rules in the
> form of variables, override them at will, and eval() them at the end?
> E.g.
> define ruleA
> version 1
> endef
> then later...
> define ruleA
> version 2
> endef
> $(eval $(call ruleA,...))
Thanks for the tip.  And now that I think about it, an even simpler
and clearer idiom would be using GNU make ability of "recipe canning"
(which is a great, great feature IMO):

  define rule-foo
    do something
    @do something else, hiding the recipe
    do something else; \
      that spans \
      multiple lines

  define rule-bar

 ... # Then later ...
 foo bar:

However, even my simplified idiom, if used throughout, would rapidly
render the "makefile library" I was hinting to more cumbersome to
write and to understand than I'd like; having a more "native" way to
obtain the intended effect would be better.  I guess in the end it
will boil down to: is it be easier to consistently use the idiom
above, or to enhance GNU make to implement my feature request?
I have no answer for that, lacking any knowledge about GNU make
internals; I guess the make developers here will be in a better
position to answer my question.


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