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Re: [bug #55137] $(file …) is executed too early when used in recipe

From: Edward Welbourne
Subject: Re: [bug #55137] $(file …) is executed too early when used in recipe
Date: Mon, 20 May 2019 09:12:05 +0000

Paul Smith (16 May 2019 17:37)
> The only idea I have for "legitimate real-world use" is something like:
>    foo:
>            do some things
>            $(DO-MORE)
> where DO-MORE is some boilerplate macro defined elsewhere, that wants
> to perform some checking and invoke $(error ...) if badness is
> detected.  It might be relying on the entire recipe being expanded up-
> front to do that error checking before any part of the recipe is
> invoked.

I take it your $(DO-MORE) *not only* does some checking and possible
reporting of problems, but also expands (before "do some things" is run)
to a command that'll be run after "do some things".  It seems a rather
contrived case; but, as you noted, folk do some fairly contrived things.
Especially in make-files.

> I just really hate lots of tweakable options: you get an exponential
> increase in testing requirements etc.

Perhaps make the change and (later) add the option if there are
screams of agony when it lands,


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