bash script to strip unwanted symbols from an Apple fat-binary library

stripfatlibrary.sh

#!/bin/sh

# this is the name of the problematic lib
FRAMEWORK=ActivityX.framework
LIB=ActivityX

# these are the duplicate symbols
SYMBOLS="AFURLRequestSerialization.o AFHTTPRequestOperationManager.o AFURLSessionManager.o"

# the architectures in the lib
ARCHS=`lipo -info $FRAMEWORK/$LIB | sed -e "s/^.*are: //"`

# this is where the extracted libs will go for every architecture
rm -rf tmp 
mkdir tmp 

for ARCH in $ARCHS
do
    # split the arch from the fat binary
    lipo $FRAMEWORK/$LIB -thin $ARCH -output tmp/lib.$ARCH

    for SYMBOL in $SYMBOLS
    do  
        # remove symbol from lib
        ar -d -sv tmp/lib.$ARCH $SYMBOL
    done
done

# resolve the actual location of the library 
LIB_PATH=$FRAMEWORK/`readlink $FRAMEWORK/$LIB`
echo $LIB_PATH

# make a replacement fat binary
lipo tmp/* -create -output $LIB_PATH

# and tidy up
rm -rf tmp