RTEMS Tools on 5 release can't be build with modern LLVM

[Christian MAUDERER]

Am 16.08.21 um 17:12 schrieb Joel Sherrill:
> On Mon, Aug 16, 2021 at 10:08 AM Christian MAUDERER
> <christian.mauderer at embedded-brains.de> wrote:
>>
>> Hello Joel,
>>
>> Am 16.08.21 um 17:03 schrieb Joel Sherrill:
>>> On Mon, Aug 16, 2021 at 9:49 AM Christian MAUDERER
>>> <christian.mauderer at embedded-brains.de> wrote:
>>>>
>>>> Hello,
>>>>
>>>> I noted that I can't build the RTEMS 5 toolchain if I have a modern LLVM
>>>> installed using the RTEMS source builder. Therefore I would like to
>>>> backport the patch 37ad446d9dce3 ([1]) to the 5 branch. Is that OK? If
>>>> someone acknowledges it, I would do the following steps without further
>>>> review (but of course with testing):
>>>>
>>>> 1. Create a ticket for the problem.
>>>> 2. In rtems-tools: Cherry pick the patch 37ad446d9dce3 to the 5 branch.
>>>> 3. In rtems-source-builder: Backport the patch 91932d0a0 [2] to the 5
>>>> branch (or rather re-create it because it will be a different commit and
>>>> a different hash).
>>>
>>> I'm ok with this. I remember doing a patch for the opposite direction.
>>> I couldn't
>>> build on an older gcc because it assumed a different language version as
>>> default. gcc 4.8 as on CentOS 7 assumes C++03. Newer versions assume C++11
>>> as the base. Similarly newer gcc's seem to default to C11.
>>
>> Thanks. I'll wait a bit more before adding the patches in case someone
>> else want's to object.
> 
> 
> Good plan.
> 
>>>
>>> I posted a few weeks ago that users should really be careful to always use
>>> -std and consciously pick what they want.
>>
>> In this case, the version of the standard depends quite a lot on the
>> LLVM headers. LLVM seems to love using new features.
> 
> Then this is probably not the first time we will face this.

Definitively not. It is only a backport of a patch so I had that problem 
already on another system. I only missed to add it to the 5 branch back 
then.

Best regards

Christian

> 
> --joel
> 
>> Best regards
>>
>> Christian
>>
>>>
>>> --joel
>>>
>>>>
>>>> Best regards
>>>>
>>>> Christian
>>>>
>>>> [1]
>>>> https://git.rtems.org/rtems-tools/commit/?id=37ad446d9dce3438d6d32e1caf56d3fdccdd2ad0
>>>>
>>>> [2]
>>>> https://git.rtems.org/rtems-source-builder/commit/?id=91932d0a0c86400366f9c75a62123b6488ff458a
>>>> --
>>>> --------------------------------------------
>>>> embedded brains GmbH
>>>> Herr Christian MAUDERER
>>>> Dornierstr. 4
>>>> 82178 Puchheim
>>>> Germany
>>>> email: christian.mauderer at embedded-brains.de
>>>> phone: +49-89-18 94 741 - 18
>>>> fax:   +49-89-18 94 741 - 08
>>>>
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>>
>> --
>> --------------------------------------------
>> embedded brains GmbH
>> Herr Christian MAUDERER
>> Dornierstr. 4
>> 82178 Puchheim
>> Germany
>> email: christian.mauderer at embedded-brains.de
>> phone: +49-89-18 94 741 - 18
>> fax:   +49-89-18 94 741 - 08
>>
>> Registergericht: Amtsgericht München
>> Registernummer: HRB 157899
>> Vertretungsberechtigte Geschäftsführer: Peter Rasmussen, Thomas Dörfler
>> Unsere Datenschutzerklärung finden Sie hier:
>> https://embedded-brains.de/datenschutzerklaerung/

-- 
--------------------------------------------
embedded brains GmbH
Herr Christian MAUDERER
Dornierstr. 4
82178 Puchheim
Germany
email: christian.mauderer at embedded-brains.de
phone: +49-89-18 94 741 - 18
fax:   +49-89-18 94 741 - 08

Registergericht: Amtsgericht München
Registernummer: HRB 157899
Vertretungsberechtigte Geschäftsführer: Peter Rasmussen, Thomas Dörfler
Unsere Datenschutzerklärung finden Sie hier:
https://embedded-brains.de/datenschutzerklaerung/