khchen added a comment. clang will calculate the default target-abi if -mabi is empty and encode the it in LLVM IR module flag. then if llc has no target-abi option (`Options.MCOptions.ABIName` is empty), in getSubtargetImpl it uses different way to compute the default target-abi, then the default result is not same. Currently it works well because getSubtargetImpl only check the ABI when `Options.MCOptions.ABIName` is not empty.
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