Using as: f

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2.4 Work Faster: -f

‘-f’ should only be used when assembling programs written by a (trusted) compiler. ‘-f’ stops the assembler from doing whitespace and comment preprocessing on the input file(s) before assembling them. See Preprocessing.

Warning: if you use ‘-f’ when the files actually need to be preprocessed (if they contain comments, for example), as does not work correctly.