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Date:      Sun, 6 Oct 2019 01:01:40 +0100
From:      tech-lists <tech-lists@zyxst.net>
To:        Dimitry Andric <dim@freebsd.org>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: CPUTYPE?= in make.conf
Message-ID:  <20191006000140.GA24947@bastion.zyxst.net>
In-Reply-To: <A89A9DFF-CA60-41B7-BD09-B24E40F25E7E@FreeBSD.org>
References:  <20191004141338.GA72749@bastion.zyxst.net> <A89A9DFF-CA60-41B7-BD09-B24E40F25E7E@FreeBSD.org>

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Hi,

On Fri, Oct 04, 2019 at 07:16:26PM +0200, Dimitry Andric wrote:

>This is not a hardware failure, but totally expected behavior.  You can
>only run poudriere builds for CPUs of an equal, or earlier generation,
>and even then you will have to ensure that the target CPU does not
>accidentally support instructions from your host CPU.

I was surprised to find that the sandybridge (Xenon E5-2690) would not comp=
ile for
CPUTYPE?=3Dbonnell (this is intel atom N450) as the N450 is a lot (2010) ol=
der.

But the haswell compiles for CPUTYPE?=3Dbonnell fine.

This is what made me wonder if there's some kind of fault with the
Xenon E5-2690. Or maybe it just can't use CPUTYPE?=3D properly? Does its use
require any special capability of the host chip?

If I don't put any CPUTYPE?=3D in poudriere's make.conf on the Xenon,=20
everything compiles as expected without error. Maybe I should just do this =
;)

*** although I'm going to continue compiling for btver1 on the haswell as t=
he
resulting system feels more responsive.

thanks,

--=20
J.

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