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From: Jonathan Wakely <jwakely.gcc@gmail.com>
Date: Wed, 8 Apr 2020 08:05:58 +0000
Message-ID: <CAH6eHdRmpPpdJKe+C3-FL3QugybCMZMrgvFgD98iOOtDN5qpDw@mail.gmail.com>
Subject: Re: Default arch on Linux/PowerPC?
To: Jeffrey Walton <noloader@gmail.com>
Cc: gcc-help <gcc-help@gcc.gnu.org>
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On Wed, 8 Apr 2020 at 03:38, Jeffrey Walton via Gcc-help
<gcc-help@gcc.gnu.org> wrote:
>
> Hi Everyone,
>
> I was wondering about this output when using GCC on PowerPC. Why is
> GCC advertising Power7 and Power8 when the arch switches to enable
> them are not present on Linux?
>
> ==========
>
> This is GCC112 on the compile farm. Both GCC 4.8 and 8.3 have the
> behavior. Notice there are no options like -maltivec or -mcpu=power8

gcc -Q --help=target | fgrep cpu

The compilers on gcc112 are configured for powerpc64le-*-linux which
implies POWER8 because that target isn't supported on POWER7.