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Re: Odd rule issue

From: David Boyce
Subject: Re: Odd rule issue
Date: Thu, 9 Dec 2010 17:31:27 -0500

On Thu, Dec 9, 2010 at 6:26 AM, AdamWainwright <address@hidden> wrote:
> -------------------------------------------------
> PROGS=../xxx
> $(PROGS): $(addsuffix .y, $(@F))
>        cp $(@F).y $@
> -------------------------------------------------
> Initial run copies file 'xxx.y' to 'xxx'.  If 'xxx.y' is updated then the
> rule does not equate to 'true' (because the file 'xxx' doesn't exist) and
> actions taken.  Using debug I find it isn't even considering the
> dependencies of the addsuffix() and states that the file doesn't need to be
> updated.  I feel there is some error in my logic here but I can't put my
> finger on it.

One error in your logic is documented at
"It's very important that you recognize the limited scope in which
automatic variable values are available: they only have values within
the recipe." Since $@ and its variant $(@F) are automatic variables,
they cannot be used in the top (target: prereq) line.

David Boyce

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