If you're on 64bit OS and want to compile musl and sqlite, run this (Ubuntu 64bit)
sudo apt-get install gcc-multilib g++-multilib
them compile, you may use musl-1.1.24.tar.gz , the newer version might not compatible https://musl.libc.org/releases.html
(need confirm)
If compile on Ubuntu 64bit, you may change to:
CROSS_COMPILE="/usr/bin/"