Re: [dpdk-dev] Build failures in 21.11-rc2

[Thomas Monjalon <thomas@monjalon.net>]

09/11/2021 17:12, Lance Richardson:
> Do the machines used for the CentOS 8 CI builds support AVX512?

Probably not. OK thank you.

> The failing build is on an Ice Lake server with:
>      meson -Dmachine=native build
>      ninja -C build
> 
> On Tue, Nov 9, 2021 at 11:08 AM Thomas Monjalon <thomas@monjalon.net> wrote:
> > 09/11/2021 16:57, David Marchand:
> > > On Tue, Nov 9, 2021 at 4:53 PM Lance Richardson
> > > <lance.richardson@broadcom.com> wrote:
> > > >
> > > > 21.11-rc2 builds are failing on CentOS 8.4, apparently because
> > > > the intrinsic _mm512_set_epi8() is not defined in the GCC
> > > > headers (see example below).
> > >
> > > Thanks for reporting Lance.
> > > It rings a bell, think it was mentionned in the past.
> >
> > CI compilation was passing:
> > http://mails.dpdk.org/archives/test-report/2021-November/238534.html
> > I would like to better understand.
> >
> > [...]
> > > > Here is a GCC patch to add this intrinsic:
> > > > https://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg188664.html
> > > >
> > > > BTW, GCC 10.2.1 (via "scl enable gcc-toolset-10") is able to build
> > > > 21.11-rc2 successfully on CentOS 8.4.
> > > >
> > > >     Lance
> > > >
> > > > # gcc --version
> > > > gcc (GCC) 8.4.1 20200928 (Red Hat 8.4.1-1)
> > [...]
> > > > ../lib/hash/rte_thash_x86_gfni.h:59:24: error: implicit declaration of
> > > > function ‘_mm512_set_epi8’; did you mean ‘_mm512_set1_epi8’?
> >
> > What is different in your setup compared to the CI?