Create sysroots for cross compiling targeting debian-like system (raspbian) or alpine.

Start container with mounted volumes on /chroots and /sysroots Have environment variables set:

• SYSROOT = sysroot name, will be the directory name
• DISTRO = debian/alpine debian works for all that can do debootstrap
• MIRROR = the mirror of the distro server. for example http://archive.raspbian.org/raspbian
• ARCH = armhf or aarch64 works for now.
• VERSION = actually works now only on debian packages, for example buster

Hit setup.sh with parameters for the required packages to install

After that, you'll have SYSROOT directory on your volume that you mounted to /sysroots, and you can use that as your -sysroot on gcc, or CMake sysroot variable.

Debian style programs is using qemu on arm/aarch64. It uses chroot to run apt-get to install packages. Alpine works with apk.static.