Currently, Linux kernel v2.6.x can be compiled by GCC 5 and below. But latest distros, such as Fedora 28, Ubuntu 18.04 and so on are using GCC 7, 8 and above. This project provides an environment that you can compile linux kernel v2.6 with GCC 5 and below. The environment is based on Ubuntu 14.04 which include the required GCC.

$ git clone https://github.com/memnoth-projects/docker-kernel-builder.git

$ cd docker-kernel-builder

$ docker build --tag kernel kernel-v2.6/

$ docker run -i -t --network host --name kern2.6 -v /path/to/kernel/source:/root/mpoint kernel /bin/bash

/path/to/kernel/source must be a path pointed to host folder where you have kernel source. Because the image does not include kernel source.

If you distro causes an error of SELinux during the command, add :Z flag in the end of -v like -v /path/to/kernel/source:/root/mpoint:Z.

How to build a custom linux kernel for QEMU