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| <a name="Enable-Listings_003a-_002da_005bcdghlns_005d"></a> |
| <h3 class="section">2.1 Enable Listings: <samp>-a[cdghlns]</samp></h3> |
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| <p>These options enable listing output from the assembler. By itself, |
| ‘<samp>-a</samp>’ requests high-level, assembly, and symbols listing. |
| You can use other letters to select specific options for the list: |
| ‘<samp>-ah</samp>’ requests a high-level language listing, |
| ‘<samp>-al</samp>’ requests an output-program assembly listing, and |
| ‘<samp>-as</samp>’ requests a symbol table listing. |
| High-level listings require that a compiler debugging option like |
| ‘<samp>-g</samp>’ be used, and that assembly listings (‘<samp>-al</samp>’) be requested |
| also. |
| </p> |
| <p>Use the ‘<samp>-ag</samp>’ option to print a first section with general assembly |
| information, like as version, switches passed, or time stamp. |
| </p> |
| <p>Use the ‘<samp>-ac</samp>’ option to omit false conditionals from a listing. Any lines |
| which are not assembled because of a false <code>.if</code> (or <code>.ifdef</code>, or any |
| other conditional), or a true <code>.if</code> followed by an <code>.else</code>, will be |
| omitted from the listing. |
| </p> |
| <p>Use the ‘<samp>-ad</samp>’ option to omit debugging directives from the |
| listing. |
| </p> |
| <p>Once you have specified one of these options, you can further control |
| listing output and its appearance using the directives <code>.list</code>, |
| <code>.nolist</code>, <code>.psize</code>, <code>.eject</code>, <code>.title</code>, and |
| <code>.sbttl</code>. |
| The ‘<samp>-an</samp>’ option turns off all forms processing. |
| If you do not request listing output with one of the ‘<samp>-a</samp>’ options, the |
| listing-control directives have no effect. |
| </p> |
| <p>The letters after ‘<samp>-a</samp>’ may be combined into one option, |
| <em>e.g.</em>, ‘<samp>-aln</samp>’. |
| </p> |
| <p>Note if the assembler source is coming from the standard input (e.g., |
| because it |
| is being created by <code>gcc</code> and the ‘<samp>-pipe</samp>’ 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. |
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