[PATCH 2/3] Move ftime to a compatibility symbol

[Florian Weimer]

* Tamar Christina:

>> Has SPEC ever fixed any standards violations?  I don't have access to the SPEC
>> web site, so I don't know if they have released patches to fix conformance
>> bugs in benchmarks.  (I recall several discussions about aliasing violations in
>> older benchmarks on the GCC lists.)
>
> They do, and have in the past, but while I can reasonably get one for
> SPEC2017, SPEC2006 is no longer maintained as far as I am aware.

Here they refused it for SPEC2017:

| q1. Will SPEC fix spec_qsort.c?
| 
| a1. No. There are two reasons:
| 
|     That's the way it is in real life
|     The module spec_qsort.c is based directly on the BSD version, as updated Thu Mar 5 17:17:11 2015 UTC in revision 279666: https://svnweb.freebsd.org/base/head/lib/libc/stdlib/qsort.c?revision=279666.
|     No moving targets
|     SPEC CPU®2017 has already been released. Once source code has been released for a benchmark, SPEC strongly prefers not to change the source code unless there are compelling portability reasons.
|
| Note, therefore, that the patch attached to GCC bug 83201 is not approved by SPEC and would not be allowed in a reportable run.

<https://www.spec.org/cpu2017/Docs/benchmarks/505.mcf_r.html>

> If the header was still there but empty I could do something at link
> time, but since it doesn't exist at all I have to provide my own local
> headers.  Also if you have a list of interfaces glibc plans to remove
> we can also feed this on to them to avoid in the next SPEC release.
> https://www.spec.org/cpuv8/

There is no such list.  There isn't even consensus among glibc
developers that it's necessary to provide a deprecation notice before
removal.  Building with an appropriate version of _POSIX_SOURCE can help.

A good indicator is whether a function has been removed by POSIX.
Sometimes the manual pages also mark a function as obsolete.  Usually,
that's sufficient reason to stay away from it.  For ftime, this happened
some time before 2004.

Thanks,
Florian
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