cross-compile-with-docker.md

Cross Compile with Docker Env

This only works if your linux env supports qemu-user-static. So, run the following if you haven't already.

sudo apt-get install qemu qemu-user-static binfmt-support 
sudo apt-get install gcc-arm-linux-gnueabihf libc6-dev-armhf-cross  
sudo apt-get install binutils-arm-linux-gnueabi

There are a number of excellent docker build tools.

• multiarch/qemu-user-static
• multiarch/crossbuild

And, if you would like to run armhf binaries in a docker container. Here are some excellent ones to start with:

• multiarch/busybox
• multiarch/debian-bootstrap
• multiarch/alpine
• multiarch/ubuntu-debootstrap

Just remember that alpine may not have the same "shared libraries"...

To register docker host for transparent qemu user emulation run the following:

docker run --rm --privileged multiarch/qemu-user-static:register

You can also transparently cross-compile:

docker run --rm -v $(pwd):/workdir -e CROSS_TRIPLE=arm-linux-gnueabihf multiarch/crossbuild make helloworld

And run it via:

docker run -it --rm multiarch/debian-debootstrap:armhf-jessie