/usr/lib/gcc-cross/arm-linux-gnueabihf/7/plugin/libcp1plugin.so.0 is in gcc-7-arm-linux-gnueabihf 7.3.0-16ubuntu3cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc-cross/arm-linux-gnueabihf/7/plugin/libcp1plugin.so.0.0.0