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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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