preinst is in g++-4.9-s390x-linux-gnu 4.9.3-13ubuntu2cross1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
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 s390x-linux-gnu-g++ /usr/bin/s390x-linux-gnu-g++-4.9
fi
exit 0
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