On 04/28/2018 08:15 PM, kbuild test robot wrote:
> Hi Maciej,
>
> FYI, the error/warning still remains.
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> master
> head: 19b9ad67310ed2f685062a00aec602bec33835f0
> commit: 688838442147d9dd94c2ef7c2c31a35cf150c5fa drm/bridge/sii8620: use
> micro-USB cable detection logic to detect MHL
> date: 7 weeks ago
> config: x86_64-randconfig-s4-04290805 (attached as .config)
> compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
> reproduce:
> git checkout 688838442147d9dd94c2ef7c2c31a35cf150c5fa
> # save the attached .config to linux build tree
> make ARCH=x86_64
>
> All errors (new ones prefixed by >>):
>
> drivers/gpu/drm/bridge/sil-sii8620.o: In function `sii8620_remove':
>>> drivers/gpu/drm/bridge/sil-sii8620.c:2405: undefined reference to
>>> `extcon_unregister_notifier'
> drivers/gpu/drm/bridge/sil-sii8620.o: In function `sii8620_extcon_init':
>>> drivers/gpu/drm/bridge/sil-sii8620.c:2229: undefined reference to
>>> `extcon_find_edev_by_node'
>>> drivers/gpu/drm/bridge/sil-sii8620.c:2241: undefined reference to
>>> `extcon_register_notifier'
> drivers/gpu/drm/bridge/sil-sii8620.o: In function `sii8620_extcon_work':
>>> drivers/gpu/drm/bridge/sil-sii8620.c:2189: undefined reference to
>>> `extcon_get_state'
The correct fix for this IMO is:
config DRM_SIL_SII8620
...
depends on EXTCON || !EXTCON
but doing that causes kconfig-recursive-dependency-hell-messy-spaghetti.
OTOH, doing:
select EXTCON
does not cause any kconfig recursive dependency issues and solves the build
errors.
--
~Randy
