[OE-core] [PATCH] kernel.bbclass: allow exporting files from kernel recipes to sysroot

[richard.purdie at linuxfoundation.org]

On Mon, 2018-09-24 at 14:19 +0000, Mikko.Rapeli at bmw.de wrote:
> My only complaint is that it's not obvious in a kernel recipe that
> more than do_install() is needed to export files to sysroot.
> It's easy to miss the sysroot_stage_all_append() step.

I think that becomes a documentation problem. The bbclass helper may
also help?

> Overwriting files from kernel recipe fails when they are used to
> prepare sysroots for user recipes, but not when the kernel recipe is
> build:
> 
> ERROR: linux-image-1.0.0-r21 do_prepare_recipe_sysroot: The file
> /usr/include/scsi/scsi_bsg_fc.h is installed by both linux-libc-
> headers and linux, aborting
> ERROR: linux-image-1.0.0-r21 do_prepare_recipe_sysroot: Function
> failed: extend_recipe_sysroot
> 
> In this case linux recipe added kernel specific headers to
> /usr/include which conflict with linux-libc-headers and this was only
> cought when building the kernel image.

That is true, not sure how exactly we'd detect that earlier either (in
a way which doesn't kill performance or involve special cases). I'm
open to ideas, documentation is the main tool I think we have here.

Cheers,

Richard