OpenCloudOS-Kernel/arch/x86/entry/vdso/checkundef.sh

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#!/bin/sh
nm="$1"
file="$2"
$nm "$file" | grep '^ *U' > /dev/null 2>&1
if [ $? -eq 1 ]; then
exit 0
else
echo "$file: undefined symbols found" >&2
exit 1
fi