[PATCH 12/11] s390x: Add Add glibc-hwcaps support

[Florian Weimer]

* Stefan Liebler via Libc-alpha:

>> That's quite bad because it breaks the existing AT_PLATFORM subdirectory
>> for z13 and newer.  (I expect the reason to have such a directory is to
>> put vectorized code there.)  Given that this is an unsupported
>> configuration for glibc, maybe the test failure is acceptable.  On the
>> other hand, if we deprecate the old mechanism (separate discussion),
>> this becomes a supported configuration, so adapting the test makes
>> sense.

> I assume novx is usually used only for testing purposes. If e.g. RHEL 8
> is booted with novx, it would fail on the first vector instruction as
> the ALS includes those.
>
> Currently I know, that the dfp-subdirectory was used for libdfp in the
> past. Now the distros require a minimum architecture level which always
> has support for dfp and the base libdfp library is built with hardware
> dfp instructions.
>
> There are also different flavors for libatlas. As far as I know, those
> are located in the corresponding vector-hwcap subdirectories instead of
> z13/z14/z15.
>
> Do you have an outlook when you plan to deprecate/remove the old mechanism?

I'll start a separate thread for this topic once I've dealt with some
urgent priority work on my end.

Thanks,
Florian
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