Bookworm aarch64 cross compile docker

Debian provides cross compilers in their matching distribution. For example, if you are running Debian 12 on your workstation or VM:

sudo dpkg --add-architecture arm64
sudo apt-get update

# Cross compiler
sudo apt-get install gcc-aarch64-linux-gnu

# Install any needed libraries/headers from Debian 12 for arm64:
sudo apt-get install libc6-dev:arm64 libgpiod-dev:arm64

A hello world can be built with:

aarch64-linux-gnu-gcc hello.c -o hello

Tools like docker/cqfd can make this simpler to run Debian 12 in a container just for the build. See our cqfd hello world project that demonstrates a simpler way to run these from most Linux systems.