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

From: Mike Frysinger <vapier at gentoo dot org>
To: "H.J. Lu" <hjl dot tools at gmail dot com>
Cc: Andrew Senkevich <andrew dot n dot senkevich at gmail dot com>, libc-alpha <libc-alpha at sourceware dot org>
Date: Mon, 27 Jun 2016 15:04:50 -0400
Subject: Re: [PATCH x86_64][BZ #20139] Don't allow configure with not supporting AVX512 assembler w/o --disable-avx512.
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References: <CAMXFM3tJkhW78PPe4=FUhbm=8HoOY4iouSqXxLObA0GEMTxoZA at mail dot gmail dot com> <20160627181631 dot GA4091 at vapier dot lan> <CAMe9rOqJsAQXJq767=zpLH=YFp0kixzDwLy8qJOB0qB-LaKL7g at mail dot gmail dot com>

On 27 Jun 2016 11:25, H.J. Lu wrote:
> On Mon, Jun 27, 2016 at 11:16 AM, Mike Frysinger <vapier@gentoo.org> 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

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

References:
- [PATCH x86_64][BZ #20139] Don't allow configure with not supporting AVX512 assembler w/o --disable-avx512.
  - From: Andrew Senkevich
- Re: [PATCH x86_64][BZ #20139] Don't allow configure with not supporting AVX512 assembler w/o --disable-avx512.
  - From: Mike Frysinger
- Re: [PATCH x86_64][BZ #20139] Don't allow configure with not supporting AVX512 assembler w/o --disable-avx512.
  - From: H.J. Lu

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