GNU objdump prints the file format in lowercase, e.g. elf64-x86-64. llvm-objdump prints ELF64-x86-64 right now, even though piping that into llvm-objcopy refuses that as a valid arch to use.
As an example of a problem this causes, see: https://github.com/ClangBuiltLinux/linux/issues/779
clang-format: please reformat the code