RISC-V toolchain and Qemu in Docker.
$ cd riscv-docker
$ docker build -t lshpku/riscv:64g_toolchain-v20200924_qemu-4.2.1 .$ docker run -it --rm lshpku/riscv:64g_toolchain-v20200924_qemu-4.2.1
$ cat <<EOF > hello.c
#include <stdio.h>
int main() {
printf("Hello, world!\n");
}
EOF
$ riscv64-unknown-linux-gnu-gcc -o hello hello.c
$ qemu-riscv64 -L /opt/riscv/sysroot hello
# Hello, world!
$ exit