build-qemu.yml

# I spent a while adding a step to a CircleCI config that installed a more recent
# version of QEMU on an Ubuntu 14.04 VM. I ended up not needing it, but I didn't
# want to lose it in case it was useful for some reason.
#
# This builds and installs the qemu-aarch64-static tool and configures binfmt to
# support ELF files for ARM64.

       - run:
         name: Build QEMU
         command: >-
           wget -O qemu.tar.xz https://download.qemu.org/qemu-3.1.0.tar.xz &&
           mkdir qemu &&
           tar -C qemu --strip-components 1 -xvJf qemu.tar.xz &&
           cd qemu &&
           ./configure --static --disable-system --enable-linux-user --target-list=aarch64-linux-user --prefix=/usr &&
           make &&
           sudo make install &&
           sudo ln -s "$(which qemu-aarch64)" "$(which qemu-aarch64)"-static &&
           sudo scripts/qemu-binfmt-conf.sh --qemu-path /usr/bin --qemu-suffix -static