[Buildroot] [PATCH/next 1/1] linuxptp: fix build with kernel headers >= 4.19

[Baruch Siach <baruch@tkos.co.il>]

Hi Thomas,

Thomas Petazzoni writes:
> On Fri, 30 Nov 2018 06:26:55 +0200, Baruch Siach wrote:
>
>> [ Resending with the updated address of Richard ]
>>
>> Adding Richard Cochran who introduced this net_tstamp.h change in kernel
>> commit 80b14dee2be.
>>
>> Fabrice Fontaine writes:
>> > clockid_t has been added in net_tstamp.h since kernel 4.19 and
>> > https://github.com/torvalds/linux/commit/80b14dee2bea128928537d61c333f24cb8cbb62f
>> >
>> > As a result, build fails on:
>> > In file included from clock.c:20:
>> > /home/peko/autobuild/instance-0/output/host/arc-buildroot-linux-uclibc/sysroot/usr/include/linux/net_tstamp.h:158:2: error: unknown type name 'clockid_t'
>> >   clockid_t clockid; /* reference clockid */
>> >
>> > To fix this error, add (or move) include on time.h before net_tstamp.h
>> > in clock.c, sk.c and timemaster.c
>>
>> I think this is a bug in the net_tstamp.h header. UAPI headers should
>> not reference userspace types. It should use __kernel_clockid_t instead.
>>
>> Richard, can you comment on that?
>
> Any update on this? I agree with Baruch here, __kernel_clockid_t should
> be used.
>
> However, 4.19 is already released with this clockid_t reference, so I
> guess we will anyway have to support that ?

A patch fixing that would be backported to 4.19.x I think. So unless
some external toolchain sticks to older buggy header, we can get away
with that.

baruch

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