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

[Christian MAUDERER]

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.

> 
> 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.

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
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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/