/usr/bin/mips64el-linux-gnuabi64-gcc-ar is in gcc-mips64el-linux-gnuabi64 4:7.3.0-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/mips64el-linux-gnuabi64-gcc-ar-7
/usr/bin/mips64el-linux-gnuabi64-gcc-ar-7