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

On Mon, Jun 27, 2016 at 12:04 PM, Mike Frysinger <> wrote:
> On 27 Jun 2016 11:25, H.J. Lu wrote:
>> On Mon, Jun 27, 2016 at 11:16 AM, Mike Frysinger <> wrote:
>> > On 27 Jun 2016 20:40, Andrew Senkevich wrote:
>> >> +'--disable-avx512'
>> >> +     By default for x86_64, the GNU C Library is built with
>> >> +     '--enable-avx512'.  Configure with '--disable-avx512' if assembler
>> >> +     doesn't support AVX512.
>> >
>> > people shouldn't have to pass configure flags like this to get a
>> > successful build.  we have all the info in order to figure out a
>> > sane default.  specifying enable/disable flags is purely to not
>> > use the default autodetection.
>> We want to make sure that x86-64 glibc supports AVX512.  Any
>> suggestions are welcome.
> i don't see how that's relevant to what i said.  if the assembler can
> be probed to see if it supports AVX512, then do that.  why do you need
> a configure flag at all in that case ?
> -mike

We want to REQUIRE AVX512 support for x86-64 glibc build.


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