preinst is in gcc-7-x86-64-linux-gnux32 7.3.0-16ubuntu3cross1.
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 12 | #!/bin/sh
set -e
if [ "$1" = "upgrade" ] || [ "$1" = "configure" ]; then
update-alternatives --quiet --remove x86_64-linux-gnux32-gcc /usr/bin/x86_64-linux-gnux32-gcc-7
update-alternatives --quiet --remove x86_64-linux-gnux32-gcov /usr/bin/x86_64-linux-gnux32-gcov-7
fi
exit 0
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