pc32 -> plt32 conversion and related questions

[Jan Beulich]

On 17.06.2021 17:34, H.J. Lu wrote:
> On Thu, Jun 17, 2021 at 8:30 AM Jan Beulich <jbeulich@suse.com> wrote:
>>
>> On 17.06.2021 17:23, H.J. Lu wrote:
>>> On Thu, Jun 17, 2021 at 8:16 AM Jan Beulich <jbeulich@suse.com> wrote:
>>>> On 17.06.2021 17:13, H.J. Lu wrote:
>>>>> On Tue, Jun 15, 2021 at 6:42 AM Jan Beulich <jbeulich@suse.com> wrote:
>>>>>> And then, still in this same context, I did also notice that the
>>>>>> linker complains about e.g. PC32 relocs when building a shared
>>>>>> library even when that's a x32 one (suggesting to rebuild with
>>>>>> -fPIC). 32-bit relocations can't overflow in that ABI, so wouldn't
>>>>>> such errors better be suppressed there?
>>>>>
>>>>> It can overflow in x32 since x32 is totally implemented on software
>>>>> and there is no address wraparound.
>>>>
>>>> But that is to be dealt with by the dynamic linker, isn't it? The
>>>> static linker should assume everything fits in the 2Gb window.
>>>
>>> What can the dynamic linker do? We are talking about shared
>>> libraries here.  The distance between a shared library and
>>> another shared library/executable can be > 2GB.
>>
>> In x32? That would be a bug in the dynamic loader, wouldn't it?
> 
> Why?  x32 can use the full 4GB address space.

Hmm, okay, I must be misremembering something then that I think I read
somewhere not so long ago. Or perhaps an outdated document. I'm sorry
for the noise then.

Jan