It produces a .S file if `-S` flag was given. By default, it produces a .S file in a temporary and assemble it with `as` and write its output object file (an .o

It produces a .S file if `-S` flag was given. By default, it produces a .S file in a temporary and assemble it with `as` and write its output object file (an .o) file is produced as an output from the compiler.