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| <title>Using as: VAX-Opts</title> |
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| <a name="VAX_002dOpts"></a> |
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| Next: <a href="VAX_002dfloat.html#VAX_002dfloat" accesskey="n" rel="next">VAX-float</a>, Up: <a href="Vax_002dDependent.html#Vax_002dDependent" accesskey="u" rel="up">Vax-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
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| <hr> |
| <a name="VAX-Command_002dLine-Options"></a> |
| <h4 class="subsection">9.48.1 VAX Command-Line Options</h4> |
| |
| <a name="index-command_002dline-options-ignored_002c-VAX"></a> |
| <a name="index-VAX-command_002dline-options-ignored"></a> |
| <p>The Vax version of <code>as</code> accepts any of the following options, |
| gives a warning message that the option was ignored and proceeds. |
| These options are for compatibility with scripts designed for other |
| people’s assemblers. |
| </p> |
| <dl compact="compact"> |
| <dd><a name="index-_002dD_002c-ignored-on-VAX"></a> |
| <a name="index-_002dS_002c-ignored-on-VAX"></a> |
| <a name="index-_002dT_002c-ignored-on-VAX"></a> |
| </dd> |
| <dt><code><code>-D</code> (Debug)</code></dt> |
| <dt><code><code>-S</code> (Symbol Table)</code></dt> |
| <dt><code><code>-T</code> (Token Trace)</code></dt> |
| <dd><p>These are obsolete options used to debug old assemblers. |
| </p> |
| <a name="index-_002dd_002c-VAX-option"></a> |
| </dd> |
| <dt><code><code>-d</code> (Displacement size for JUMPs)</code></dt> |
| <dd><p>This option expects a number following the ‘<samp>-d</samp>’. Like options |
| that expect filenames, the number may immediately follow the |
| ‘<samp>-d</samp>’ (old standard) or constitute the whole of the command line |
| argument that follows ‘<samp>-d</samp>’ (<small>GNU</small> standard). |
| </p> |
| <a name="index-_002dV_002c-redundant-on-VAX"></a> |
| </dd> |
| <dt><code><code>-V</code> (Virtualize Interpass Temporary File)</code></dt> |
| <dd><p>Some other assemblers use a temporary file. This option |
| commanded them to keep the information in active memory rather |
| than in a disk file. <code>as</code> always does this, so this |
| option is redundant. |
| </p> |
| <a name="index-_002dJ_002c-ignored-on-VAX"></a> |
| </dd> |
| <dt><code><code>-J</code> (JUMPify Longer Branches)</code></dt> |
| <dd><p>Many 32-bit computers permit a variety of branch instructions |
| to do the same job. Some of these instructions are short (and |
| fast) but have a limited range; others are long (and slow) but |
| can branch anywhere in virtual memory. Often there are 3 |
| flavors of branch: short, medium and long. Some other |
| assemblers would emit short and medium branches, unless told by |
| this option to emit short and long branches. |
| </p> |
| <a name="index-_002dt_002c-ignored-on-VAX"></a> |
| </dd> |
| <dt><code><code>-t</code> (Temporary File Directory)</code></dt> |
| <dd><p>Some other assemblers may use a temporary file, and this option |
| takes a filename being the directory to site the temporary |
| file. Since <code>as</code> does not use a temporary disk file, this |
| option makes no difference. ‘<samp>-t</samp>’ needs exactly one |
| filename. |
| </p></dd> |
| </dl> |
| |
| <a name="index-VMS-_0028VAX_0029-options"></a> |
| <a name="index-options-for-VAX_002fVMS"></a> |
| <a name="index-VAX_002fVMS-options"></a> |
| <a name="index-Vax_002d11-C-compatibility"></a> |
| <a name="index-symbols-with-uppercase_002c-VAX_002fVMS"></a> |
| <p>The Vax version of the assembler accepts additional options when |
| compiled for VMS: |
| </p> |
| <dl compact="compact"> |
| <dd><a name="index-_002dh-option_002c-VAX_002fVMS"></a> |
| </dd> |
| <dt>‘<samp>-h <var>n</var></samp>’</dt> |
| <dd><p>External symbol or section (used for global variables) names are not |
| case sensitive on VAX/VMS and always mapped to upper case. This is |
| contrary to the C language definition which explicitly distinguishes |
| upper and lower case. To implement a standard conforming C compiler, |
| names must be changed (mapped) to preserve the case information. The |
| default mapping is to convert all lower case characters to uppercase and |
| adding an underscore followed by a 6 digit hex value, representing a 24 |
| digit binary value. The one digits in the binary value represent which |
| characters are uppercase in the original symbol name. |
| </p> |
| <p>The ‘<samp>-h <var>n</var></samp>’ option determines how we map names. This takes |
| several values. No ‘<samp>-h</samp>’ switch at all allows case hacking as |
| described above. A value of zero (‘<samp>-h0</samp>’) implies names should be |
| upper case, and inhibits the case hack. A value of 2 (‘<samp>-h2</samp>’) |
| implies names should be all lower case, with no case hack. A value of 3 |
| (‘<samp>-h3</samp>’) implies that case should be preserved. The value 1 is |
| unused. The <code>-H</code> option directs <code>as</code> to display |
| every mapped symbol during assembly. |
| </p> |
| <p>Symbols whose names include a dollar sign ‘<samp>$</samp>’ are exceptions to the |
| general name mapping. These symbols are normally only used to reference |
| VMS library names. Such symbols are always mapped to upper case. |
| </p> |
| <a name="index-_002d_002b-option_002c-VAX_002fVMS"></a> |
| </dd> |
| <dt>‘<samp>-+</samp>’</dt> |
| <dd><p>The ‘<samp>-+</samp>’ option causes <code>as</code> to truncate any symbol |
| name larger than 31 characters. The ‘<samp>-+</samp>’ option also prevents some |
| code following the ‘<samp>_main</samp>’ symbol normally added to make the object |
| file compatible with Vax-11 "C". |
| </p> |
| <a name="index-_002d1-option_002c-VAX_002fVMS"></a> |
| </dd> |
| <dt>‘<samp>-1</samp>’</dt> |
| <dd><p>This option is ignored for backward compatibility with <code>as</code> |
| version 1.x. |
| </p> |
| <a name="index-_002dH-option_002c-VAX_002fVMS"></a> |
| </dd> |
| <dt>‘<samp>-H</samp>’</dt> |
| <dd><p>The ‘<samp>-H</samp>’ option causes <code>as</code> to print every symbol |
| which was changed by case mapping. |
| </p></dd> |
| </dl> |
| |
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