/usr/src/gcc-8/debian/cpp-BV-CRB.preinst.in is in gcc-8-source 8-20180414-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #!/bin/sh
set -e
if [ "$1" = "upgrade" ] || [ "$1" = "configure" ]; then
update-alternatives --quiet --remove @TARGET@-cpp /usr/bin/@TARGET@-cpp-@BV@
fi
#DEBHELPER#
exit 0
|