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

[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.

--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
> >> --
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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/