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Date: Sat, 17 Jul 2021 23:13:04 +0100
From: Liang Ma <liangma@liangbit.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: dev@dpdk.org, yi.rong@intel.com, Liang Ma <liangma@bytedance.com>,
 stable@dpdk.org, Bruce Richardson <bruce.richardson@intel.com>,
 Konstantin Ananyev <konstantin.ananyev@intel.com>
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Subject: Re: [dpdk-dev] [PATCH] buildtools: Check GCC version to avoid GCC
 6.3.0 avx512 bug
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On Sat, Jul 17, 2021 at 10:48:49AM -0700, Stephen Hemminger wrote:
> On Sat, 17 Jul 2021 18:08:30 +0100
> Liang Ma <liangma@liangbit.com> wrote:
> 
> > From: Liang Ma <liangma@bytedance.com>
> > 
> > GCC 6.3.0 has a known bug which related to _mm512_extracti64x4_epi64.
> > Please reference https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82887
> > 
> > Some DPDK PMD avx512 version heavily use _mm512_extracti64x4_epi6,
> > which casue building failure with debug buildtype.
> > 
> > Therefore, it's helpful to disable avx512 for GCC 6.3.0
> > 
> > Bugzilla ID: 717
> > Fixes: e6a6a138919f (net/i40e: add AVX512 vector path)
> > Fixes: 808a17b3c1e6 (net/ice: add Rx AVX512 offload path)
> > Fixes: 4b64ccb328c9 (net/iavf: fix VLAN extraction in AVX512 path)
> > Cc: stable@dpdk.org
> > 
> > Reported-by: Liang Ma <liangma@liangbit.com>
> > Signed-off-by: Liang Ma <liangma@bytedance.com>
> 
> What distro still has GCC 6.3.0?
For example  Debian 9.x