as: f

 
 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 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.