[Buildroot] gmp.h error compiling Linux 5.11 with Buildroot 2021.02 default arm toolchain

[Thomas Petazzoni]

Hello,

On Wed, 24 Mar 2021 10:14:26 +0100
Michael Opdenacker <michael.opdenacker at bootlin.com> wrote:

> I'm try to compile Linux 5.11 for BeagleBone Black with the default
> toolchain generated by Buildroot 2021.02 (uClibc, gcc 9.3 for Cortex
> A8). I'm on Ubuntu 20.04.
> 
> cd linux-5.11.8
> export PATH=/home/tux/boot-time-labs/rootfs/buildroot/output/host/bin:$PATH
> export ARCH=arm
> export CROSS_COMPILE=arm-linux-
> make omap2plus_defconfig
> make

Do you have a Buildroot configuration that uses an internal toolchain +
a Linux kernel built by Buildroot, that reproduces this? Or does it
only happens with an external toolchain and/or when you build the
kernel outside of Buildroot?

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