如何实现protobuf在XCODE上armv7/armv7s/i386的交叉编译

折腾了4天，终于在xcode上完成protobuf2.5.0的交叉编译，希望与我遇到相同问题的同学不在纠结。分享如下：

步骤一：部署protoc.exe

1）sudo su             ---进入管理模式

//以下操作切换至protobuf文件夹下

2）./configure

3)make

4)make check

5)make install

此时可以查看protobuf文件夹下面的makefile文件，可以查看-build表示的本机环境以及-host表示的编译库的运行环境

我本地的-build=x86_64-apple-darwin12.3.0  

-host=x86_64-apple-darwin12.3.0

（这两个参数在后续配置脚本需要用到，与后面脚步的i686-apple-darwin12.3.0以及arm-apple-darwin12.3.0后缀“arm-apple-darwin12.3.0”保持一致）

6）make distclean清理已生成的makefile，为交叉编译配置新makefile做准备

步骤二：配置交叉编译

1）执行脚本ios-build.sh，脚本内容如下：

configure_for_platform() {

export PLATFORM=$1

#export PLATFORM=iPhoneOS

echo "Platform is ${PLATFORM}"

if [ "$PLATFORM" == "iPhoneSimulator" ]; then

export ARCHITECTURE=i386

export ARCH=i686-apple-darwin12.3.0

fi

if [ "$PLATFORM" == "iPhoneOS" ]; then

export ARCHITECTURE=$2

export ARCH=arm-apple-darwin12.3.0

fi

export ARCH_PREFIX=$ARCH-

export SDKVER="6.1"   #sdk版本号必须正确

export DEVROOT=/Applications/Xcode.app/Contents/Developer/Platforms/${PLATFORM}.platform/Developer

export SDKROOT="$DEVROOT/SDKs/${PLATFORM}$SDKVER.sdk"

export PKG_CONFIG_PATH="$SDKROOT/usr/lib/pkgconfig:$DEVROOT/usr/lib/pkgconfig"

export AS="$DEVROOT/usr/bin/as"

export ASCPP="$DEVROOT/usr/bin/as"

export AR="$DEVROOT/usr/bin/ar"

export RANLIB="$DEVROOT/usr/bin/ranlib"

#export CPP="$DEVROOT/usr/bin/c++"

#export CXXCPP="$DEVROOT/usr/bin/c++"

export CC="$DEVROOT/usr/bin/gcc"

export CXX="$DEVROOT/usr/bin/g++"

export LD="$DEVROOT/usr/bin/ld"

export STRIP="$DEVROOT/usr/bin/strip"

export LIBRARY_PATH="$SDKROOT/usr/lib"

export CPPFLAGS=""

#export CFLAGS="-arch armv7 -fmessage-length=0 -pipe -fpascal-strings -miphoneos-version-min=4.0 -isysroot=$SDKROOT -I$SDKROOT/usr/include -I$SDKROOT/usr/include/c++/4.2.1/"

export CFLAGS="-arch ${ARCHITECTURE} -fmessage-length=0 -pipe -fpascal-strings -miphoneos-version-min=4.0 -isysroot=$SDKROOT -I$SDKROOT/usr/include -I$SDKROOT/usr/include/c++/4.2.1/"

export CXXFLAGS="$CFLAGS"

#export LDFLAGS="-isysroot='$SDKROOT' -L$SDKROOT/usr/lib/system -L$SDKROOT/usr/lib/"

export LDFLAGS="-arch ${ARCHITECTURE} -isysroot='$SDKROOT' -L$SDKROOT/usr/lib/system -L$SDKROOT/usr/lib/"

./configure --host=${ARCH} --with-protoc=protoc --enable-static --disable-shared

}

mkdir ios-build

#build for iPhoneSimulator

configure_for_platform iPhoneSimulator

make clean

make

cp src/.libs/libprotobuf-lite.a ios-build/libprotobuf-lite-i386.a

#提取完整版本(i386)

cp src/.libs/libprotobuf.a ios-build/libprotobuf-i386.a

#build for iPhoneOS armv7

configure_for_platform iPhoneOS armv7

make clean

make

cp src/.libs/libprotobuf-lite.a ios-build/libprotobuf-lite-armv7.a

#提取完整版本(armv7)

cp src/.libs/libprotobuf.a ios-build/libprotobuf-armv7.a

#build for iPhoneOS armv7s

configure_for_platform iPhoneOS armv7s

make clean

make

cp src/.libs/libprotobuf-lite.a ios-build/libprotobuf-lite-armv7s.a

#提取完整版本(armv7s)

cp src/.libs/libprotobuf.a ios-build/libprotobuf-armv7s.a

make clean

#cerate a fat library containing all achitectures in libprotobuf-lite.a

xcrun -sdk iphoneos lipo -arch armv7 ios-build/libprotobuf-lite-armv7.a -arch armv7s ios-build/libprotobuf-lite-armv7s.a -arch i386 ios-build/libprotobuf-lite-i386.a -create -output ios-build/libprotobuf-lite.a

#合并三个完整版本（libprotobuf.a）

xcrun -sdk iphoneos lipo -arch armv7 ios-build/libprotobuf-armv7.a -arch armv7s ios-build/libprotobuf-armv7s.a -arch i386 ios-build/libprotobuf-i386.a -create -output ios-build/libprotobuf.a

2）将打包生成的libprotobuf-lite.a和libprotobuf.a复制至工程下进行编译，可以编译protobuf在xcode上的模拟器版本和真机版本，完成交叉编译。