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ld: warning: ignoring duplicate libraries: This triggers quite frequently in llvm's build because CMake's library depends mechanism doesn't de-duplicate libraries on the link line. Duplication is necessary for ELF platforms, but means something subtly different on Darwin platforms, hence the warning. Since we don't have much control over that from CMake, just disable the warning wholesale whenever the linker is detected to support it.
See docs/CMake.html for instructions on how to build LLVM with CMake.