[oe] Error message about multiple EGL / GLES providers

[Paul Barker]

On 21 May 2013 11:08, Carlos Rafael Giani <dv at pseudoterminal.org> wrote:
> On 2013-05-21 11:45, Burton, Ross wrote:
>>
>> On 20 May 2013 19:18, Carlos Rafael Giani <dv at pseudoterminal.org> wrote:
>>>
>>> I am currently adapting the cubox layer for dylan, and get these errors:
>>>
>>> ERROR: Multiple .bb files are due to be built which each provide
>>> virtual/libgles1
>>> ERROR: Multiple .bb files are due to be built which each provide
>>> virtual/libgles2
>>> ERROR: Multiple .bb files are due to be built which each provide
>>> virtual/egl
>>
>> What are the bb files that are being build?  I'm guessing mesa and
>> marvell-libgfx, but can you confirm this?  If you use depexp you can
>> find out what's pulling in mesa, but it's generally mesa-demos.  This
>> depends on virtual/libgl that you're not providing, so it will pull in
>> Mesa.
>>
>> If you don't have any support for "big" GL then the easiest fix is to
>> take the recent patches to mesa-demos in master that let you turn off
>> GL using PACKAGECONFIG options.
>>
>> Ross
>
>
> The collision is indeed between marvell-libgfx and mesa, I just verified. My
> case is actually quite common with embedded 3D hardware - EGL, OpenGL ES
> 1.x,2.x and OpenVG are supported, but desktop OpenGL isn't. I have seen this
> with nVidia Tegra, Vivante, PowerVR, and ARM Mali hardware so far. It would
> be useful to instruct Mesa to turn off its OpenGLES and EGL support, leaving
> Mesa only for GLX+Desktop OpenGL (software-rendered), if anybody really
> needs it. As an alternative, as you suggest, I could simply turn off desktop
> OpenGL, but I have the feeling that this would be better off as a user
> decision that can be configured in the local.conf file. What do you think?
>

This also crops up when building for raspberrypi with the
meta-raspberrypi layer. The errors I see in a `bitbake world` are
(with paths shortened):

ERROR: Multiple .bb files are due to be built which each provide
virtual/egl (.../openembedded-core/meta/recipes-graphics/mesa/mesa_9.0.2.bb
.../meta-raspberrypi/recipes-graphics/userland/userland_git.bb).
 This usually means one provides something the other doesn't and should.
ERROR: Multiple .bb files are due to be built which each provide
virtual/libgles2
(.../openembedded-core/meta/recipes-graphics/mesa/mesa_9.0.2.bb
.../meta-raspberrypi/recipes-graphics/userland/userland_git.bb).
 This usually means one provides something the other doesn't and should.

It's not really something I've looked into much (I don't know the full
list of things mesa provides) but if there's a solution for other
platforms I could have a look at doing a similar thing in
meta-raspberrypi.

--
Paul Barker

Email: paul at paulbarker.me.uk
http://www.paulbarker.me.uk