[Buildroot] [PATCHv2] package/systemd: fix build with old toolchains

[Yann E. MORIN <yann.morin.1998@free.fr>]

Baruch, All,

On 2016-08-30 12:35 +0300, Baruch Siach spake thusly:
> Hi Yann,
> 
> On Tue, Aug 30, 2016 at 11:29:37AM +0200, Yann E. MORIN wrote:
> > Toolchains using glibc-2.18 or older do not define O_TMPFILE, which
> > causes build failures on some archs.
> > 
> > systemd has a definition for O_TMPFILE if it is missing, but only
> > defines it for i386 or x86_64. Furthermore, the header defining it is
> > not included everywhere O_TMPFILE is used.
> > 
> > Fix that with three patches backported from upstream:
> >   - include the needed header where it is needed (he!),
> >   - define O_TMPFILE for all archs, according to linux-4.8rc3,
> >   - no longer guard against undefined O_TMPFILE in fileio.
> 
> This last patch is not a pure build fix, but more of a feature enhancement. 
> Don't know if it fits in master.

Well, it's indeed not a _pure_ bug fix, but given that O_TMPFILE is now
always defined, the guards are no longer needed at all: they will never
be guarding anything now.

Besides, using O_TMPFILE is way better than not using it; it makes the
thing a little bit more secure.

> Also, your patches are missing sign-off.

Damn. Upstream is not using SoB lines (Lennart asked me to remove them
[0] and I fiorgot to re-add them when adding them in Buildroot; the
previosu iteration did have my SoB lines).

> An autobuild reference in the commit log would also be nice.

Damn, I also forgot that... :-/

Thanks!

Regards,
Yann E. MORIN.

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