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Re: Passing environment variables in reciepes

From: David Boyce
Subject: Re: Passing environment variables in reciepes
Date: Wed, 8 Dec 2010 07:31:46 -0500

On Wed, Dec 8, 2010 at 5:29 AM, Warlich, Christof
<address@hidden> wrote:
> I tried to use environment variables in the example above, which doesn't seem 
> to work (why?), but there may be better ways ?!

You're barking up the wrong tree. Each line of the recipe is passed by
make to a separate instance of the shell. Each of these processes is
the child of make, thus making them siblings. Environment variables
won't work for the same reason you can't inherit a trait from your

If you're using make 3.82 the simplest fix is to add the line


to the Makefile. This will cause all lines of each recipe to be
grafted together and passed to a single shell instance which makes
communication much easier. If using an older version you need to do
the grafting manually, e.g.:

        line 1 &&\
        line 2 &&\

And forget eval and escaped $$. Those are completely unrelated.

-David Boyce

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