[yocto] Missing dependencies on driver header

[Fabien Lahoudere]

On Fri, 2017-03-31 at 14:42 +0100, colin.helliwell at ln-systems.com wrote:
> I have a niggly problem I keep running into, especially with fresh image
> builds.
> I have a custom driver, and a user-space library for controlling it;
> therefore the library includes one of the driver's header files (IOCTL defs
> etc). 
> However I can't get the dependencies correct in the library recipe so as to
> get the driver's header installed and available to the library build step.
> In other words 'bitbake MyDriverLib' gives a "MyDriver.h: no such file or
> directory "
> The lib's recipe includes
>     inherit autotools lib_package binconfig-disabled pkgconfig
>     DEPENDS_${PN} = "MyDriver"

Usually I use "DEPENDS" and not "DEPENDS_${PN}".

Else does your kernel module recipe populate sysroot with the header?

>     RDEPENDS_${PN} = "MyDriver"
> 
> At 'some point later', the lib *will* build ok:  I've done each MyDriver
> step one by one, and it seems that once the 'install' has been done then
> MyDriverLib will then compile. ('-c compile MyDriver' isn't sufficient). But
> shouldn't the RDEPENDS above trigger the MyDriver install?
> I'm obviously missing a dependency hook somewhere?
> 
> 
>