Syslinux - Feb 2016 - binutils (objcopy?) >= 2.26 breaks syslinux (bios) build

On February 3, 2016 7:17:37 AM PST, Celelibi <celelibi at gmail.com>
wrote:
>2016-02-02 18:50 UTC+01:00, poma via Syslinux <syslinux at zytor.com>:
>> On 30.01.2016 16:59, poma wrote:
>>> ...
>>>
>>> https://sourceware.org/bugzilla/show_bug.cgi?id=19538
>>>
>>>
>>
>> Mister Anvin,
>> care to share what's the status of the "ld?" problemo,
>> is anyone working on it?
>>
>> It would be maravilloso if syslinux can continue to build and test
>with
>> latest and greatest.
>
>There have been a discussion about the -fPIC option a few month ago
>(november or december 2015). I don't remember what exactly it was
>about. I think I said I would submit a patch that add -fPIC for 32
>bits even thought it wouldn't have an actual effect regarding current
>compilers.
>
>This option is definitely required for 64 bits, and it is
>theoretically required for 32 bits. But I haven't investigated the
>current issue.
>
>Celelibi
It isn't just 32 vs 64 bits, it is also 32 bit BIOS vs 32 bit EFI, and their
requirements differ.
-- 
Sent from my Android device with K-9 Mail. Please excuse brevity and formatting.

On 02/03/16 10:30, H. Peter Anvin via Syslinux wrote:
> On February 3, 2016 7:17:37 AM PST, Celelibi <celelibi at gmail.com>
wrote:
>> 2016-02-02 18:50 UTC+01:00, poma via Syslinux <syslinux at
zytor.com>:
>>> On 30.01.2016 16:59, poma wrote:
>>>> ...
>>>>
>>>> https://sourceware.org/bugzilla/show_bug.cgi?id=19538
>>>>
>>>>
>>>
>>> Mister Anvin,
>>> care to share what's the status of the "ld?"
problemo,
>>> is anyone working on it?
>>>
>>> It would be maravilloso if syslinux can continue to build and test
>> with
>>> latest and greatest.
>>
>> There have been a discussion about the -fPIC option a few month ago
>> (november or december 2015). I don't remember what exactly it was
>> about. I think I said I would submit a patch that add -fPIC for 32
>> bits even thought it wouldn't have an actual effect regarding
current
>> compilers.
>>
>> This option is definitely required for 64 bits, and it is
>> theoretically required for 32 bits. But I haven't investigated the
>> current issue.
>>
>> Celelibi
> 
> It isn't just 32 vs 64 bits, it is also 32 bit BIOS vs 32 bit EFI, and
their requirements differ.
> 
So here is the deal... syslinux.elf in the BIOS case is really an odd
duck.  It has parts that are relocatable (and needs to export its
symbols) and parts that aren't (and also needs to export at least some
of its symbols.)

It might be that we need -Bdynamic rather than -pie, and perhaps some
modification to the relocation code, but it could also be that ld needs
a whack to the head.

	-hpa

> 
> So here is the deal... syslinux.elf in the BIOS case is really an odd
> duck.  It has parts that are relocatable (and needs to export its
> symbols) and parts that aren't (and also needs to export at least some
> of its symbols.)
> 
> It might be that we need -Bdynamic rather than -pie, and perhaps some
> modification to the relocation code, but it could also be that ld needs
> a whack to the head.
> 
> 	-hpa
> 
 
 
Hmm... relocation... interaction with binutils 2.26 behaving 
differently than older versions...

git.savannah.gnu.org/cgit/grub.git/commit/?id=67dba97e4598eaf2deb14da044
fbfb1c119cf76f

savannah.gnu.org/bugs/?46986

Regards,
Ady.
> _______________________________________________
> Syslinux mailing list
> Submissions to Syslinux at zytor.com
> Unsubscribe or set options at:
> http://www.zytor.com/mailman/listinfo/syslinux
>

On 08.02.2016 19:04, H. Peter Anvin wrote:
> On 02/03/16 10:30, H. Peter Anvin via Syslinux wrote:
>> On February 3, 2016 7:17:37 AM PST, Celelibi <celelibi at
gmail.com> wrote:
>>> 2016-02-02 18:50 UTC+01:00, poma via Syslinux <syslinux at
zytor.com>:
>>>> On 30.01.2016 16:59, poma wrote:
>>>>> ...
>>>>>
>>>>> https://sourceware.org/bugzilla/show_bug.cgi?id=19538
>>>>>
>>>>>
>>>>
>>>> Mister Anvin,
>>>> care to share what's the status of the "ld?"
problemo,
>>>> is anyone working on it?
>>>>
>>>> It would be maravilloso if syslinux can continue to build and
test
>>> with
>>>> latest and greatest.
>>>
>>> There have been a discussion about the -fPIC option a few month ago
>>> (november or december 2015). I don't remember what exactly it
was
>>> about. I think I said I would submit a patch that add -fPIC for 32
>>> bits even thought it wouldn't have an actual effect regarding
current
>>> compilers.
>>>
>>> This option is definitely required for 64 bits, and it is
>>> theoretically required for 32 bits. But I haven't investigated
the
>>> current issue.
>>>
>>> Celelibi
>>
>> It isn't just 32 vs 64 bits, it is also 32 bit BIOS vs 32 bit EFI,
and their requirements differ.
>>
> 
> So here is the deal... syslinux.elf in the BIOS case is really an odd
> duck.  It has parts that are relocatable (and needs to export its
> symbols) and parts that aren't (and also needs to export at least some
> of its symbols.)
> 
> It might be that we need -Bdynamic rather than -pie, and perhaps some
> modification to the relocation code, but it could also be that ld needs
> a whack to the head.
> 
> 	-hpa
> 
s/LD_PIE = -pie/LD_PIE = -Bdynamic/

Failed to load ldlinux.c32
Boot failed: press a key to retry...
_