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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next prev parent 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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