GNU Info

(nasm.info)Section 2.1.15

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2.1.15. The `-a' Option: Don't Preprocess At All
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   If NASM is being used as the back end to a compiler, it might be
desirable to suppress preprocessing completely and assume the compiler
has already done it, to save time and increase compilation speeds. The
`-a' option, requiring no argument, instructs NASM to replace its
powerful preprocessor with a stub preprocessor which does nothing.