clang in Xcode 7.2 generates vxorps

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I encountered an issue where compiling cryptopp with clang from Xcode 7.2 generates a vxorps instruction in ByteQueue::ByteQueue(unsigned long). Since our product can be run on old CPUs where this instruction triggers illegal instruction I need to tackle this somehow. Can I turn off AVX somehow? Or is the only workaround upgrading Xcode?

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