[poky] How to export kernel specific headers to userspace

[Richard Purdie]

On Tue, 2018-06-19 at 05:16 +0000, Ankit Rastogi wrote:
> Can someone provide any pointers on how to export kernel specific
> headers to userspace?
> 
> I am getting below error while building our one of the component
> which requires kernel uapi headers.
> 
> Error Received:
>  /hdmi-capture/main.c:16:10: fatal error: linux/hdmi_info.h: No such
> file or directory
> > |  #include <linux/hdmi_info.h>
> > |           ^~~~~~~~~~~~~~~~~~~
> > | compilation terminated.
> 
> In yocto 2.5, userspace is boot strapped with linux-libc-headers
> package which uses a set of uapi headers from Linux kernel 4.15. Can
> someone suggest for custom kernels, how to expose uapi headers to
> userspace? Thus create a separate linux-apl-headers package with
> those files.

linux-libc-headers is really there to bootstrap the libc and toolchain,
not provide non-standard kernel headers to userspace. You likely need
to create your own recipe which installs the correct extra headers and
then have your code DEPEND on that recipe.

Cheers,

Richard