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From: Florian Weimer <fweimer@redhat.com>
To: Jozef Lawrynowicz <jozef.l@mittosystems.com>
Cc: gnu-gabi@sourceware.org
Subject: Re: [RFC] SHF_GNU_RETAIN ELF Section Flag
Date: Tue, 15 Sep 2020 14:37:04 +0200	[thread overview]
Message-ID: <87v9gfi5cf.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <20200915123155.xpow3oxpzycsq3ie@jozef-acer-manjaro> (Jozef Lawrynowicz's message of "Tue, 15 Sep 2020 13:31:55 +0100")

* Jozef Lawrynowicz:

> On Tue, Sep 15, 2020 at 02:09:22PM +0200, Florian Weimer wrote:
>> * Jozef Lawrynowicz:
>> 
>> > I'd like to propose a new ELF section flag, SHF_GNU_RETAIN, for addition
>> > to the GNU gABI.
>> >
>> > This flag instructs the linker to "retain" the section in the output
>> > file, even if garbage collection would remove it because it appears
>> > unused.
>> 
>> How does this flag interaction with libraries (.a files)?
>
> If a section in a library has SHF_GNU_RETAIN set, and that library gets
> searched by the linker for some undefined symbol, then the
> SHF_GNU_RETAIN section will also be pulled into the program, and
> retained in the linked output file.

Sorry, that's not quite what I meant.  What happens if the .o file with
SHF_GNU_RETAIN in an .a library is not otherwise referenced and thus
never loaded by the link editor?  How would the link editor realize that
it is even there?

Thanks,
Florian
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  reply	other threads:[~2020-09-15 12:37 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-15 12:06 Jozef Lawrynowicz
2020-09-15 12:09 ` Florian Weimer
2020-09-15 12:31   ` Jozef Lawrynowicz
2020-09-15 12:37     ` Florian Weimer [this message]
2020-09-15 12:50       ` Carlos O'Donell
2020-09-15 12:55         ` Florian Weimer
2020-09-15 13:29           ` Jozef Lawrynowicz
2020-09-15 14:11             ` Carlos O'Donell
2020-09-15 16:52               ` Jozef Lawrynowicz
2020-09-16 12:58                 ` Carlos O'Donell
2020-09-16 13:11                 ` Florian Weimer
2020-09-16 13:46                   ` Michael Matz
2020-09-18 12:07                     ` Florian Weimer
2020-09-18 12:22                       ` Jozef Lawrynowicz
2020-09-18 18:09                         ` Florian Weimer
2020-09-16 14:13                   ` Jozef Lawrynowicz
2020-09-18 10:00                     ` Jozef Lawrynowicz
2020-09-18 18:11                       ` Florian Weimer
2020-09-21 12:42                         ` Michael Matz
2020-09-21 18:53                           ` Jozef Lawrynowicz

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