3.12 Passing Options to the Assembler

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.

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https://gcc.gnu.org/onlinedocs/gcc-5.4.0/gcc/Assembler-Options.html