[PATCH x86_64][BZ #20139] Don't allow configure with not supporting AVX512 assembler w/o --disable-avx512.

[H.J. Lu]

On Tue, Jun 28, 2016 at 6:04 AM, Andrew Senkevich
<andrew.n.senkevich@gmail.com> wrote:
> 2016-06-27 23:22 GMT+03:00 Joseph Myers <joseph@codesourcery.com>:
>> On Mon, 27 Jun 2016, H.J. Lu wrote:
>>
>>> >> May be it will be the best way.  Needed version is 2.25 and it was
>>> >> released at Mon, 5 Jan 2015.
>>> >
>>> >
>>> > It's a fairly recent version.
>>> >
>>>
>>> Binutils 2.24 released in Dec., 2013 supports AVX512.
>>
>> Time-based updates to the binutils requirements would indicate moving to
>> requiring binutils 2.24 for building glibc 2.25 and later rather than
>> requiring it now for building glibc 2.24, but given a clear reason for the
>> requirement I wouldn't object to bringing it forward.
>>
>> Note: if we require a version with AVX512 support, we should also remove
>> all the configure / preprocessor / makefile conditionals on such support,
>> and all places where .byte directives are used for instruction encoding
>> because of instructions not supported in older versions.
>
> If current issue is enough reason for requiring binutils 2.24 now for
> building Glibc 2.24 I can prepare this patch.
>

Here is a patch to require binutils 2.24 to build x86-64 glibc.  Tested
with binutils 2.24 and 2.27.  Verified with binutils 2.23 which fails to
configure glibc.  OK for master?

-- 
H.J.
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