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/usr/lib/linux/4.15.0-45-generic/compiler is in linux-buildinfo-4.15.0-45-generic 4.15.0-45.48~16.04.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

1
GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.10) 5.4.0 20160609