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

[Florian Weimer]

On 06/29/2016 11:45 PM, H.J. Lu wrote:
> Subject: [PATCH] Require binutils 2.24 to build x86-64 glibc

Please put [BZ #20139] at the end of the first line.

> If assembler doesn't support , _dl_runtime_resolve_avx is used
> to save the first 8 vector registers, which only saves the lower 256
> bits of vector register, for lazy binding.  When it is called on AVX512
> platform, the upper 256 bits of ZMM registers are clobbered.  Parameters
> passed in ZMM registers will be wrong when the function is called the
> first time.  This patch requires binutils 2.24, whose assembler can store
> and load ZMM registers, to build x86-64 glibc.  Since mathvec library
> needs assembler support for AVX512DQ,  we disable mathvec if assembler
> doesn't support AVX512DQ.

The commit message seems to be inconsistent.  Should the “AVX512DQ” on 
the first line actually be “AVX512F”?

Thanks,
Florian