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

From: Florian Weimer <fweimer at redhat dot com>
To: Andrew Senkevich <andrew dot n dot senkevich at gmail dot com>, libc-alpha <libc-alpha at sourceware dot org>
Date: Mon, 27 Jun 2016 20:20:20 +0200
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> <5ecbe6ab-79a9-7bf4-909b-3b61d0877559 at redhat dot com> <CAMXFM3tp-hDH5zNOO=eZAELbmuQbaWCrEo1JWM-ETCwTNb5RVA at mail dot gmail dot com>

On 06/27/2016 08:15 PM, Andrew Senkevich wrote:

2016-06-27 21:03 GMT+03:00 Florian Weimer <fweimer@redhat.com>:

On 06/27/2016 07:40 PM, Andrew Senkevich wrote:


To fix BZ #20139 we need don't let to configure with not supporting
AVX512 assembler w/o --disable-avx512.



There is an existing configure check for HAVE_AVX512_ASM_SUPPORT.  Why isn't
it sufficient?


Where are bug https://sourceware.org/bugzilla/show_bug.cgi?id=20139
It is the case when HAVE_AVX512_ASM_SUPPORT is undefined and Glibc is
built for AVX512 hardware.


It's still unclear to me what you are proposing as a remedy.

Building glibc with --disable-avx512 will still be broken, no?

Thanks,
Florian

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

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