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

[Mike Frysinger]

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.
-mike
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