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The optimizer will now convert calls to memcmp into a calls to bcmp in some circumstances. Users who are building freestanding code (not depending on the platform’s libc) without specifying -ffreestanding may need to either pass -fno-builtin-bcmp, or provide a bcmp function. http://llvm.org/docs/ReleaseNotes.html#non-comprehensive-list-of-changes-in-this-release