You can pass options to the assembler.
-Wa,option ¶Pass option as an option to the assembler. If option contains commas, it is split into multiple options at the commas.
-Xassembler option ¶Pass option as an option to the assembler. You can use this to supply system-specific assembler options that GCC does not recognize.
If you want to pass an option that takes an argument, you must use -Xassembler twice, once for the option and once for the argument.