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Message-ID: <1432020598.11357.109.camel@linuxfoundation.org>
From: Richard Purdie <richard.purdie@linuxfoundation.org>
To: Nithyakala Sainath <nithisai@gmail.com>
Date: Tue, 19 May 2015 08:29:58 +0100
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Subject: Re: Multiple versions of libx11 are due to be built
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On Mon, 2015-05-18 at 01:53 +0530, Nithyakala Sainath wrote:
> I want to understand the process of choosing a recipe by bitbake
>
> There is a libx11_1.3.2.bb in a layer called A with higher priority of
> 6.
>
> There is another libx11_1.4.0.bb in a layer called B with priority of
> 5.
>
> So bitbake sshould automatically pick up libx11  from A right ? Why is
> it giving me error like:
>
> " Multiple versions of libx11 are due to be built. Only one version of
> a given PN should be built in any given build. You likely need to set
> PREFERRED_VERSION_libx11 to select the correct version or don't depend
> on multiple versions."

The two libx11 recipes are likely not identical. The things the recipe
provides, be it directly with PROVIDES or in the form of packages it
generates is likely not identical. Something in your build is depending
on this item which only one recipe provides, hence the message above.

> Why should i even prefer a version? This happens when I build an
> image. But when I directly call
>
> bitbake libx11
>
> the one from layer A is getting picked up.
>
> I am confused. Can you please tell me ?
> 
Something in the image depends on something only one of the recipe
provides. I would agree debugging this can be a pain and is something we
should improve...

Cheers,

Richard