From: Florian Weimer <fweimer@redhat.com>
To: Manuel Lauss <manuel.lauss@gmail.com>
Cc: Manuel Lauss via Libc-help <libc-help@sourceware.org>
Subject: Re: How to set x86 ISA needed property?
Date: Wed, 27 Jan 2021 17:14:40 +0100 [thread overview]
Message-ID: <8735ym4arz.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <CAOLZvyEciQJJjdP-oS2sWu97Emmi+--+E7u+uJuFCOxO76L_xw@mail.gmail.com> (Manuel Lauss's message of "Wed, 27 Jan 2021 17:06:50 +0100")
* Manuel Lauss:
>
>> This is expected to happen only if you use something like
>> -march=x86-64-v3 to build glibc, and only with recent toolchain
>> version. I'm surprised you are hitting this with GCC 10, which does not
>> implement -march=x86-64-v3.
>
> I'm surprised as well, though not all libs/executables have the property set,
> most are missing it. Gentoo's patches to gcc don't add the property code
> either, i'll check binutils next.
It may be a binutils issue. It looks like it chooses x86-64-v3 as the
minimal level that includes ABM (under a different name). That doesn't
look correct. Please check if this is a Gentoo patch, or an upstream
issue.
Thanks,
Florian
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prev parent reply other threads:[~2021-01-27 16:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-27 15:04 Manuel Lauss
2021-01-27 15:26 ` Florian Weimer
2021-01-27 16:06 ` Manuel Lauss
2021-01-27 16:14 ` Florian Weimer [this message]
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