[Buildroot] [PATCH] package infra: remove duplicates in dependencies list

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear Yann E. MORIN,

On Sun,  1 Jun 2014 12:28:54 +0200, Yann E. MORIN wrote:
> From: "Yann E. MORIN" <yann.morin.1998@free.fr>
> 
> Currently, we just use what a package declares as its dependencies.
> 
> But some packages may declare the same depdency more than once. For
> example, php has two options to add SQL support: 'mysql' or 'mysqli',
> which are not exclusive. So, php.mk has mysql twice as a dependency.
> 
> Although that does not cause any grievance for make, we end up generating
> dependency graphs where this duplicate dependency is visible.
> 
> Add an intermediary variable which contains the $(sort)-ed list of the
> dependnecies, thus eliminating any duplicates.

Typo: dependencies

Also, I'm wondering: is it necessary to do this in the core package
infrastructure, or should we do it in the graph-depends tool, or even
do it only in the $(1)-show-depends target? I don't have a strong
disagreement with the patch, maybe after all it's cleaner to have the
dependencies sorted and with duplicates removed.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com