[Buildroot] [PATCH v2, 1/1] libv4l: add an option for IR BPF based decoders

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello,

On Fri,  9 Nov 2018 18:26:48 +0100, Fabrice Fontaine wrote:
> Bump to version 1.61.1 added BPF based protocols support:
> https://git.linuxtv.org/v4l-utils.git/commit/?id=d6025b0e8c7f57b0f9390f987acc5eed57360d80
> 
> However, this dependency needs BPF support in kernel. On old kernels
> (before 3.18), __NR_BPF is not defined for all architectures.
> So retrieve upstream patch and add an option to enable BPF only if
> headers are above 3.18.
> 
> Also drop patch to add bpf_common.h on old kernels (not needed anymore)
> 
> Fixes:
>  - http://autobuild.buildroot.org/results/442de57cb76a7b38d71d690490faadc641036374
> 
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>

Thanks for working on this!


> +ifeq ($(BR2_PACKAGE_LIBV4L_UTILS_IR_BPF_BASED_DECODERS),y)
> +LIBV4L_CONF_OPTS += --enable-bpf
> +LIBV4L_DEPENDENCIES += elfutils
> +
>  # Disable clang that is used to build BPF (in-kernel bytecode machine) protocols
>  LIBV4L_CONF_ENV += ac_cv_prog_CLANG=""

So without clang, how are BPF protocols being built ?

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com