Build Google protobuf 2.4.1 for iOS development

Although iOS5 shipped with a private version of protobuf but it is too old for me.
Here is the script I used to build protobuf.
1. Download the newest protobuf(2.4.1 at the moment) and unpack.
2. Run this in the unpacked directory. It will create a folder named “protobuf_dist” on desktop.
3. Copy or add protobuf_dist to xcode project. That’s all.
#!/bin/bash

TMP_DIR=/tmp/protobuf_$$

###################################################
# Build i386 version first,
# Because arm needs it binary.
###################################################

CFLAGS=-m32 CPPFLAGS=-m32 CXXFLAGS=-m32 LDFLAGS=-m32 ./configure --prefix=${TMP_DIR}/i386 \
--disable-shared \
--enable-static || exit 1
make clean || exit 2
make -j8 || exit 3
make install || exit 4

###################################################
# Build armv7 version,
###################################################

SDKROOT=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk
DEVROOT=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer

export CC=${DEVROOT}/usr/bin/llvm-gcc
export CFLAGS="-arch armv7 -isysroot $SDKROOT"

export CXX=${DEVROOT}/usr/bin/llvm-g++
export CXXFLAGS="$CFLAGS"
export LDFLAGS="-isysroot $SDKROOT -Wl,-syslibroot $SDKROOT"

./configure --prefix=$TMP_DIR/armv7 \
--with-protoc=${TMP_DIR}/i386/bin/protoc \
--disable-shared \
--enable-static \
-host=arm-apple-darwin10 || exit 1
make clean || exit 2
make -j8 || exit 3
make install || exit 4

###################################################
# Packing
###################################################

DIST_DIR=$HOME/Desktop/protobuf_dist
rm -rf ${DIST_DIR}
mkdir -p ${DIST_DIR}
mkdir ${DIST_DIR}/{bin,lib}
cp -r ${TMP_DIR}/armv7/include ${DIST_DIR}/
cp ${TMP_DIR}/i386/bin/protoc ${DIST_DIR}/bin/
lipo -arch i386 ${TMP_DIR}/i386/lib/libprotobuf.a -arch armv7 ${TMP_DIR}/armv7/lib/libprotobuf.a -output ${DIST_DIR}/lib/libprotobuf.a -create

This is tested on OSX Lion with Xcode 4.2.1