环境是OS X 10.9, Xcode版本是6.0
armv7的配置命令行为
CC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang ../configure --host=arm-apple-darwin --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.0.sdk --prefix='build' --extra-cflags='-arch armv7' --extra-ldflags='-arch armv7 -L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.0.sdk/usr/lib/system' --enable-pic --extra-asflags='-arch armv7'
arm64/aarch64的配置命令行为
CC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang ../configure --host=aarch64-apple-darwin --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.0.sdk --prefix='build' --extra-cflags='-arch arm64' --extra-ldflags='-arch arm64 -L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.0.sdk/usr/lib/system' --enable-pic --extra-asflags='-arch arm64'
这里我是在x264的顶层目录里面新建了一个build目录，在build目录执行的。
configure成功以后，用make就可以编译出binary了。
注意在configure成功以后，需要手工copy 一个新版的gas-preprocessor.pl到extras目录下面