Re: [Buildroot] [PATCH v2 1/4] package/arm-gnu-toolchain: revert to version 10

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello,

On Sun, 31 Jul 2022 02:28:49 +0200
Giulio Benetti <giulio.benetti@benettiengineering.com> wrote:

> have you tried any possible work-around for this ^^^ bug?
> At the moment I don't see any other build failure using
> gcc-arm-11.2-2022.02-x86_64-arm-none-eabi, probably because every
> package that is built with it doesn't have float type in the code(I
> presume).

The arm-gnu-toolchain package is not widely used. It's only a few
specific ARM Trusted Firmware configurations that use it for the
moment, therefore this package is never exercised in the autobuilders,
and only by a few defconfigs.

> Does the gcc bug show up while building ti-k3-image-gen or ti-k3-r5-loader?
> 
> I'd prefer to find a work-around if possible rather than downgrading
> host-arm-gnu-toolchain, also because this would impact another package
> that depends on it:
> arm-trusted-firmware
> 
> Please let me know, maybe I can help finding a work-around for that
> float ICE.

It's not an ICE. What happens is that this gcc toolchain has been
compiled for a too recent x86-64 CPU core (the host binary of gcc).
Therefore if you use this toolchain on a slightly too old x86-64
machine, it will break.

Reverting to 10.x is fine here: Linaro (who produces the toolchain) has
acknowledged the problem, and will generate an updated 11.x toolchain
at some point in the future.

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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