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From: Juergen Beisert <jbe@pengutronix.de>
Date: Thu, 31 Jan 2013 08:54:19 +0100
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Subject: Re: [ptxdist] [PATCH] lowpan-tools: new package
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Cc: Alexander Aring <alex.aring@gmail.com>

Alexander Aring wrote:
> > [...]
> > Hmmm, it worked for me (tm), but you need to make sure that
> > LOWPAN_TOOLS_CONF_ENV is defined with '=' not ':=', otherwise
> > CROSS_PYTHON is empty.
>
> Now I realize it. I found rules with ':=' and '='. Could you explain the
> different?
>
> Should I use '=' if I access variables(like CROSS_PYTHON) except
> CROSS_ENV?

Important for the make tool:

BLUB = $(BLA)
BLA = friesel
 ----> results into "BLUB = friesel"

But:

BLUB := $(BLA)
BLA = friesel
 ----> results into an empty "BLUB"

Regards,
Juergen

-- 
Pengutronix e.K.                              | Juergen Beisert             |
Linux Solutions for Science and Industry      | http://www.pengutronix.de/  |

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