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Enable Listings: `-a[cdhlns]'
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   These options enable listing output from the assembler.  By itself,
`-a' requests high-level, assembly, and symbols listing.  You can use
other letters to select specific options for the list: `-ah' requests a
high-level language listing, `-al' requests an output-program assembly
listing, and `-as' requests a symbol table listing.  High-level
listings require that a compiler debugging option like `-g' be used,
and that assembly listings (`-al') be requested also.

   Use the `-ac' option to omit false conditionals from a listing.  Any
lines which are not assembled because of a false `.if' (or `.ifdef', or
any other conditional), or a true `.if' followed by an `.else', will be
omitted from the listing.

   Use the `-ad' option to omit debugging directives from the listing.

   Once you have specified one of these options, you can further control
listing output and its appearance using the directives `.list',
`.nolist', `.psize', `.eject', `.title', and `.sbttl'.  The `-an'
option turns off all forms processing.  If you do not request listing
output with one of the `-a' options, the listing-control directives
have no effect.

   The letters after `-a' may be combined into one option, _e.g._,
`-aln'.

   Note if the assembler source is coming from the standard input (eg
because it is being created by `gcc' and the `-pipe' command line switch
is being used) then the listing will not contain any comments or
preprocessor directives.  This is because the listing code buffers
input source lines from stdin only after they have been preprocessed by
the assembler.  This reduces memory usage and makes the code more
efficient.