Enable RISC-V support in Debian

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More information: https://wiki.debian.org/RISC-V.

First, upgrade to testing with ports support.

Limit architectures in repos (optional)

Consider using this source.list file:

cat <<EOF >/etc/apt/sources.list
deb [arch=amd64] https://deb.debian.org/debian testing main contrib non-free
deb [arch=amd64] https://deb.debian.org/debian-security testing/updates main contrib non-free
deb [arch=riscv64] https://deb.debian.org/debian-ports unstable main
deb [arch=riscv64] https://deb.debian.org/debian-ports unreleased main
deb [arch=riscv64] https://deb.debian.org/debian-ports experimental main
EOF

Enable

After you've done the above, do (as root):

su -
apt install -y qemu-system-misc qemu-user-static binfmt-support
dpkg --add-architecture riscv64
apt-get install -y gcc-riscv64-linux-gnu g++-riscv64-linux-gnu
cat >/etc/ld.so.conf.d/riscv64-linux-gnu.conf <<EOF
/usr/local/lib/riscv64-linux-gnu
/lib/riscv64-linux-gnu
/usr/lib/riscv64-linux-gnu
/usr/riscv64-linux-gnu/lib/
EOF
ln -s /usr/riscv64-linux-gnu/lib/ld-linux-riscv64-lp64d.so.1 /lib