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I'm seeing something similar. clang is using HOST_LINK_VERSION, obtained from ld64, as the default for -mlinker-version. This causes Darwin.cpp to add the arguments you are seeing, but not handled by lld. Perhaps -fuse-ld should be considered in addition to -mlinker-version when adding these arguments. As a workaround, you can try passing -mlinker-version. Looks like anything < 133

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Hi. I'm using LLVM 5.0.1 on macOS 10.12. I have a very simple program (program.c): int main() {} When attempting to compile with LLD, I get this output: $ clang -fuse-ld=lld program.c /opt/llvm/5.0.1/bin/ld.lld: error: unknown argument: -no_deduplicate /opt/llvm/5.0.1/bin/ld.lld: error: unknown argument: -dynamic /opt/llvm/5.0.1/bin/ld.lld: error: unknown argument: -arch