Simply, clang has an option
'--no-integrated-as' so that the compiler invokes apple’s standalone
'as' assembler instead of using clang’s built-in. But, either has its own lost pieces.
'--no-integrated-as', clang would use its internal assembler. Unfortunately it doesn’t recognize the mnemonic
'as’ assembler reports an error in pesudo instruction
'.ios_version_min', which was apparently generated by clang itself.
Therefore I have no choice except for changing
'ldmltfd' to two simple instructions…