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From: Florian Weimer <fweimer@redhat.com>
To: Michael Matz <matz@suse.de>
Cc: x86-64-abi@googlegroups.com,  Binutils <binutils@sourceware.org>,
	 "H.J. Lu" <hjl.tools@gmail.com>,
	 GNU C Library <libc-alpha@sourceware.org>,
	 Mark Wielaard <mark@klomp.org>,
	 Cary Coutant <ccoutant@gmail.com>,
	 Nick Clifton <nickc@redhat.com>,
	 Carlos O'Donell <carlos@redhat.com>,
	 Szabolcs Nagy <szabolcs.nagy@arm.com>
Subject: Re: PT_NOTE alignment, NT_GNU_PROPERTY_TYPE_0, glibc and gold
Date: Fri, 21 Sep 2018 15:04:04 +0200	[thread overview]
Message-ID: <87worfdmt7.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <alpine.LSU.2.21.1809211232400.7867@wotan.suse.de> (Michael Matz's message of "Fri, 21 Sep 2018 12:55:16 +0000 (UTC)")

* Michael Matz:

> (didn't take part in the side meeting, so sorry if this was discussed)

I don't think this came up.

> On Wed, 19 Sep 2018, Florian Weimer wrote:
>
>> Distributions have built binaries with 8-byte-aligned GNU property 
>> notes.
>
> Which ones?

Fedora 29 and downstream.

> Thing is, there are also binaries (or there could be) that are currently 
> "valid" that the align-8 approach makes invalid, so why say that's a 
> problem for the align-4 approach, but not for the align-8 one?

The 4-byte-aligned GNU property notes are ignored by glibc even if they
are otherwise syntactically valid.  So even if there is a hypothetical
distribution that is mostly built with binutils gold and thus has
4-byte-aligned GNU property notes, it would still not work as intended,
which makes me believe that such a distribution does not exist. 8-)

Thanks,
Florian

  reply	other threads:[~2018-09-21 13:04 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAMe9rOrrayKnc_cPm4SmnDnUGLbBUmOYMBTMOM8KLAHVmb=rUQ@mail.gmail.com>
2018-08-16 13:00 ` PT_NOTE alignment, NT_GNU_PROPERTY_TYPE_0, glibc and gold (was: Re: [PATCH] Document GNU_PROPERTY_X86_ISA_1_[USED|NEEDED]) Florian Weimer
2018-08-16 13:19   ` H.J. Lu
2018-08-16 13:29     ` H.J. Lu
2018-08-16 13:31     ` PT_NOTE alignment, NT_GNU_PROPERTY_TYPE_0, glibc and gold Florian Weimer
2018-08-16 13:39       ` H.J. Lu
2018-08-16 14:01         ` Florian Weimer
2018-08-16 14:43           ` H.J. Lu
2018-08-16 14:21         ` Florian Weimer
2018-08-16 17:46           ` H.J. Lu
2018-08-16 19:16           ` Mark Wielaard
2018-08-16 19:36             ` H.J. Lu
2018-08-17  6:04               ` Mark Wielaard
2018-08-17  6:20             ` Florian Weimer
2018-08-17  6:41               ` Mark Wielaard
2018-08-17 15:10                 ` H.J. Lu
2018-08-17 21:05                   ` Mark Wielaard
2018-08-21 23:02                     ` Cary Coutant
2018-08-22  9:39                       ` Florian Weimer
2018-08-22 10:08                         ` Mark Wielaard
2018-08-22 23:36                         ` Cary Coutant
2018-08-24 18:39                           ` Florian Weimer
2018-08-23 14:41                         ` Michael Matz
2018-08-23 14:43                           ` Florian Weimer
2018-08-17 15:13               ` H.J. Lu
2018-09-19 19:22   ` Florian Weimer
2018-09-21 12:55     ` Michael Matz
2018-09-21 13:04       ` Florian Weimer [this message]
2018-09-26 17:39     ` Cary Coutant
2018-09-26 18:36       ` H.J. Lu

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