/usr/src/gcc-4.7/debian/watch is in gcc-4.7-source 4.7.3-12ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | version=2
ftp://gcc.gnu.org/pub/gcc/releases/gcc-(4\.7[\d\.]*) debian uupdate
|