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

[Mikko.Rapeli at bmw.de]

On Mon, Sep 24, 2018 at 02:11:13PM +0100, Richard Purdie wrote:
> On Mon, 2018-09-24 at 12:19 +0000, Mikko.Rapeli at bmw.de wrote:
> > > That was one old way, but not the only. And not for exposing non
> > > uapi
> > > headers.
> > 
> > What other ways exist?
> > 
> > I don't care how, but I must export custom kernel specific headers
> > and
> > other files to other recipes in a build in ways which are compatible
> > with
> > yocto upstream.
> > 
> > I have not seen any documented ways for this.
> 
> It may not be documented, perhaps because its actually very simple.
> 
> Any recipe can expose headers into the recipe sysroot, they simply
> install them where needed in do_install as normal.
> 
> So all you need is a recipe which installs the right headers and then
> you DEPEND on that recipe. Where that recipe gets the headers isn't
> relevant.

No, this does not work on sumo. My patch is needed for this to work.

Without my patch, users of kernel.bbclass have zero files in
tmp/sysroot-components even if they install extra files and extra header
only binary packages.

A generated image or SDK will have the files if the binary package is installed
but sysroot not.

-Mikko