[yocto] Including a header from an external kernel module

[Michael Allwright]

On Tue., 10 Jul. 2018, 00:15 Andre McCurdy, <armccurdy at gmail.com> wrote:

> On Mon, Jul 9, 2018 at 3:07 PM, Michael Allwright
> <michael.allwright at ulb.ac.be> wrote:
> > Yes, it ended up in the development package in the do_install_append
> > attempt
>
> How did you confirm that (ie that the header ended up in the
> module-a-dev package) ?


In the build directory, I can see that the header file is in the
module-a-dev directory under split packages.


> > , but I couldn't #include it in the second module (file didn't exist
> > in the include search paths).
>
> Did you add:
>
>   DEPENDS = "module-a"
>
> to the module-b recipe?
>

Yes, I did this.

> I would point out though, that I am interested in what is the correct way
> to
> > do this, and not just in finding some workaround / hack so that it
> works...
>
> That's good to hear.
>

So am I on the right track or should I be doing this differently?


> > On Mon., 9 Jul. 2018, 19:47 Andre McCurdy, <armccurdy at gmail.com> wrote:
> >>
> >> On Mon, Jul 9, 2018 at 8:27 AM, Michael Allwright
> >> <michael.allwright at ulb.ac.be> wrote:
> >> > Hello,
> >> >
> >> > I think it would be useful to extend the hello-mod recipe in
> >> > meta-skeleton
> >> > to demonstrate some slightly more complicated scenarios. For example,
> I
> >> > am
> >> > trying to find out how to have two external kernel modules A and B,
> >> > where
> >> > module B #includes a header file provided by module A.
> >> >
> >> > I have made module B depend on module A, however, I believe I am still
> >> > missing one or two steps in my recipe for module A such that the
> header
> >> > file
> >> > is copied into the shared kernel staging directory where module B can
> >> > find
> >> > it.
> >> >
> >> > So far I have tried the following:
> >> >
> >> > FILES_${PN}-dev += "/usr/include/linux/mfd/module-a.h"
> >> >
> >> > FILES_kernel-headers += "${includedir}/linux/mfd/module-a.h"
> >> >
> >> > do_install_append () {
> >> >    install -d ${D}${includedir}/linux/mfd
> >> >    install -m 644 ${S}/module-a ${D}${includedir}/linux/mfd/module-a.h
> >> > }
> >>
> >> And what happened after you tried the above? Did the header not end up
> >> in the -dev package for module A? Did the module A recipe not create a
> >> -dev package? Something else?
> >>
> >> > In module B, I want to be able to:
> >> >
> >> > #include <linux/mfd/module-a.h>
> >> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.yoctoproject.org/pipermail/yocto/attachments/20180710/db2ef12d/attachment.html>