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Currently on PowerPC64 targets, llvm_abiname and target_abi will be the same unless we're on AIX. Since llvm_abiname is what we pass on to LLVM, it is preferable to use the value of that to determine the calling convention rather than target_abi. All PowerPC64 targets set both llvm_abiname and target_abi to the respective ELF ABIs, with the exception of AIX. This is a non-functional change.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.