[Buildroot] how to find ununsed libs

[Patrick Fischer]

Hello

I wrote a small script to check which libs are needed on the target.
So i found that libstdc++.so.5.0.7 is installed but not needed by any prog.
(this is not about why this is in the target, I'm using a very old 
version of buildroot)

But my script told me that i don't need a lot of libs like
libuClibc-0.9.28.so
(ld-uClibc-0.9.28.so is needed)

I think this is a bug in my script.
Can anybody check my script if it works fine?


#!/bin/sh

LIBSNEEDED=needed_libs
LIBSFOUND=fount_libs
LDD=mipsel-linux-ldd
ROOTFS=build_mipsel/root/

find $ROOTFS -type f -exec $LDD  {} 2>/dev/null  \; | grep -v "not a 
dynamic executable" | cut -d"=" -f1 | tr -d "\t" | sort -n > $LIBSNEEDED
find $ROOTFS -name "*so*" -type f  -exec ls -l {} \;| cut -d " " -f 5,9 
| sort -n -r > $LIBSFOUND

cat $LIBSFOUND | while read size lib
do
        #example build_mipsel/root/lib/libresolv-0.9.28.so -> libresolv
        if grep `basename $lib | cut -d"-" -f1 | cut -d"." -f1` 
$LIBSNEEDED > /dev/null;
        then
                echo $lib is needed
        else
                echo $lib not needed, you can save $size bytes
        fi
done