.a包生成64位

./configure  CC="/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" CFLAGS="-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.1.sdk -arch arm64" --host=arm-apple-darwin  --prefix=/Users/hanvon/Desktop/jpeg-9a/libs4arm64 --disable-shared

.a包生成64位

原文：http://www.cnblogs.com/pp-pping/p/4381700.html