[yocto] Issue when integrating different bsp-layers on a single bblayers.conf

[Iván Castell]

Hello forum.

I am trying to integrate several BSP-layers for different platforms on a
single Yocto repository to build a Linux Yocto-based distro for all those
platforms easily.

The idea is maintaining a single bblayers.conf with all the layers
available, set PLATFORM and DISTRO on local.conf, call bitbake <image> and
get the final image for that platform.

When setting the "build" directory with a bblayers.conf customized for a
single platform, each platform builds the image recipe properly.

However, when I have integrated all bsp-layers in a single bblayers.conf,
the compilation of some platforms has been broken.

The specific problem is this: one bsp layer (meta-rockchip +
meta-rockchip-extra) defines a recipes-graphics/mesa/mesa_%.bbappend with
this content inside:

    PROVIDES_remove = "virtual/libgles1 virtual/libgles2 virtual/egl
virtual/libwayland-egl"

That alters gstreamer recipe on the poky layer, getting this error when
building for a meta-intel platform:

    ERROR: Nothing PROVIDES 'virtual/egl' (but
/data/yocto/yocto/sources/poky/meta/recipes-multimedia/gstreamer/
gstreamer1.0-vaapi_1.12.2.bb,
/data/yocto/yocto/sources/poky/meta/recipes-multimedia/gstreamer/
gstreamer1.0-plugins-bad_1.12.2.bb DEPENDS on or otherwise requires it)

My questions:

    - Is a good practice to define a custom bblayers.conf depending on the
choosen PLATFORM?
    - Is there some any other way to disable a BSP-layer completely when
building for a different one?
    - Can you suggest a fix to solve this issue?

Thanks a lot in advance! :)

Kind regards.
  -- Ivan
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