/usr/share/doc/gdc-multilib-sparc64-linux-gnu is in gdc-multilib-sparc64-linux-gnu 4:5.3.1-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/cpp-sparc64-linux-gnu
/usr/share/doc/cpp-sparc64-linux-gnu