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Cross Compilation for ARM on Linux

Through cross compilation, on Linux it is possible to build CoreCLR for arm or arm64.

Requirements

You need a Debian based host and the following packages needs to be installed:

$ sudo apt-get install qemu qemu-user-static binfmt-support debootstrap

In addition, to cross compile CoreCLR the binutils for the target are required. So for arm you need:

$ sudo apt-get install binutils-arm-linux-gnueabihf

and conversely for arm64:

$ sudo apt-get install binutils-aarch64-linux-gnu

Generating the rootfs

The cross\build-rootfs.sh script can be used to download the files needed for cross compilation. It will generate an Ubuntu 14.04 rootfs as this is what CoreCLR targets.

Usage: build-rootfs.sh [BuildArch]
BuildArch can be: arm, arm64

The build-rootfs.sh script must be run as root as it has to make some symlinks to the system, it will by default generate the rootfs in cross\rootfs\<BuildArch> however this can be changed by setting the ROOTFS_DIR environment variable.

For example, to generate an arm rootfs:

$ sudo ./cross/build-rootfs.sh arm

and if you wanted to generate the rootfs elsewhere:

$ sudo ROOTFS_DIR=~/coreclr-cross/arm ./build-rootfs.sh arm

Cross compiling CoreCLR

Once the rootfs has been generated, it will be possible to cross compile CoreCLR. If ROOTFS_DIR was set when generating the rootfs, then it must also be set when running build.sh.

So, without ROOTFS_DIR:

$ ./build.sh arm debug verbose clean cross

And with:

$ ROOTFS_DIR=~/coreclr-cross/arm ./build.sh arm debug verbose clean cross

As usual the resulting binaries will be found in bin/Product/BuildOS.BuildArch.BuildType/