/usr/bin/x86_64-linux-gnux32-gcc is in gcc-x86-64-linux-gnux32 4:7.3.0-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/x86_64-linux-gnux32-gcc-7
/usr/bin/x86_64-linux-gnux32-gcc-7