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Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Cary Coutant <ccoutant at gmail dot com>
- Cc: Michael Matz <matz at suse dot de>, Richard Biener <richard dot guenther at gmail dot com>, Alan Modra <amodra at gmail dot com>, Jeff Law <law at redhat dot com>, Joe Groff <jgroff at apple dot com>, Binutils <binutils at sourceware dot org>, GCC <gcc at gcc dot gnu dot org>
- Date: Tue, 19 Apr 2016 08:54:03 -0700
- Subject: Re: Preventing preemption of 'protected' symbols in GNU ld 2.26 [aka should we revert the fix for 65248]
- Authentication-results: sourceware.org; auth=none
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On Tue, Apr 19, 2016 at 8:52 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Tue, Apr 19, 2016 at 8:44 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
>> On Tue, Apr 19, 2016 at 8:37 AM, Cary Coutant <ccoutant@gmail.com> wrote:
>>>>> So with all this it sounds that current protected visibility is just
>>>>> broken and we should forgo with it, making it equal to default
>>>>> visibility?
>>>>
>>>> Like how? You mean in GCC regarding protected as default visibility? No,
>>>> that's just throwing out the baby with the water. We should make
>>>> protected do what it was intended to do and accept that not all invariants
>>>> that are true for default visible symbols are also true for protected
>>>> symbols, possibly by ...
>>>>
>>>>> At least I couldn't decipher a solution that solves all of the issues
>>>>> with protected visibility apart from trying to error at link-time (or
>>>>> runtime?) for the cases that are tricky (impossible?) to solve.
>>>>
>>>> ... this.
>>>
>>> Right. Protected visibility worked fine without copy relocations for
>>> 15 years until HJ's patch. I don't know of anyone with a legitimate
>>> complaint about that until HJ filed a bug based on his artificial test
>>> case.
>>
>> Cary, please stop spreading the incorrect information. There is
>> at lease one GCC bug against protected symbol:
>>
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55012
>>
>> which was reported by other people.
>
> I opened this bug in 2005:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19520
>
> Richard opened:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51880
>
> in 2012.
>
Another old bug:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10908
--
H.J.