[PATCHv2] Add --no-hard-links option to localedef (Bug 23923)

[Florian Weimer]

* Carlos O'Donell:

> On 11/26/18 11:58 AM, Joseph Myers wrote:
>> On Mon, 26 Nov 2018, Carlos O'Donell wrote:
>> 
>>> If the downstream distro wants to post-process the hardlinks then
>>> the time spent in localedef looking up sibling directories and
>>> processing hardlinks is wasted effort.
>> 
>> Do you have figures for the time involved?
>
> On a fast SSD the -j1 locale build and install of SUPPORTED locales
> is 3% faster, or for me roughly ~10s on a:
> "make localedata/install-locale-files DESTDIR=..." iteration.
>
> The option itself ensures that no hard links are present and that may
> make the logic of the post-install hardlink creation phase simpler.
> So there is more than just performance to consider.

The real performance win comes from the ability to use parallel make and
still get fully deterministic results.

Thanks,
Florian