cat > main.c

"$p4dcc" < main.c > main.s
if [[ $? -ne 0 ]]; then
    cat main.s >&2
    exit 1
fi
gcc -Wl,-z,noexecstack -o a.out main.s
./a.out > output
exit_code=$?

if [[ $exit_code -ne 0 ]]; then
    echo "invalid exit code: $exit_code" >&2
    exit 1
fi

diff -u expected output