/usr/lib/gcc-cross/arm-linux-gnueabihf/4.8/ecj1 is in gcj-4.8-arm-linux-gnueabihf 4.8.2-16ubuntu4cross0.11.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc-cross/arm-linux-gnueabihf/4.8/../../../gcc/x86_64-linux-gnu/4.8/ecj1