Linux cross-build environment by docker.

This dockerfile setups a sandbox for cross building environment based on lkp-test's make.cross script.

To build the docker image, please run below command.

sudo docker build -t linux-cross-build linux-cross-build/

Note that this image will consumes more than 3GB, so huge. You should check your disk has enough space.

And run the built image with your kernel tree as below

sudo docker run -ti -v /path/to/your/kernel:/opt/linux linux-cross-build

This builds the kernel for "i386 x86_64 arm arm64 ia64 mips powerpc s390 sparc64 sh openrisc".

To build some specific archs in above arch, you can pass it as a parameter like below.

sudo docker run -ti -v /path/to/your/kernel:/opt/linux linux-cross-build arm

By default, this script compiles kernel with defconfig for each arch. If you want to change the configuration, you can pass "*config" option as a parameter, e.g. below command build kernels with allmodconfig for arm and arm64.

sudo docker run -ti -v /path/to/your/kernel:/opt/linux linux-cross-build arm allmodconfig arm64

To speed up the build time, you can mount your tmpfs or localfs to the container for build as below (you should use --rm option so that the container is removed automatically after use, since this container is just for build environment.)

sudo docker run -ti --rm -v /path/to/your/kernel:/opt/linux -v /path/to/tmpdir:/tmp  linux-cross-build

Note that on Fedora or other distros which enables SELinux on docker, you have to set SELinux attribute on the directories exposed to the container.

chcon -Rt svirt_sandbox_file_t /path/to/your/kernel