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<h4 class="subsection">3.17.51 VMS Options</h4>
<p>These &lsquo;<samp><span class="samp">-m</span></samp>&rsquo; options are defined for the VMS implementations:
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<dt><code>-mvms-return-codes</code><dd><a name="index-mvms_002dreturn_002dcodes-2644"></a>Return VMS condition codes from <code>main</code>. The default is to return POSIX-style
condition (e.g. error) codes.
<br><dt><code>-mdebug-main=</code><var>prefix</var><dd><a name="index-mdebug_002dmain_003d_0040var_007bprefix_007d-2645"></a>Flag the first routine whose name starts with <var>prefix</var> as the main
routine for the debugger.
<br><dt><code>-mmalloc64</code><dd><a name="index-mmalloc64-2646"></a>Default to 64-bit memory allocation routines.
<br><dt><code>-mpointer-size=</code><var>size</var><dd><a name="index-mpointer_002dsize_003d_0040var_007bsize_007d-2647"></a>Set the default size of pointers. Possible options for <var>size</var> are
&lsquo;<samp><span class="samp">32</span></samp>&rsquo; or &lsquo;<samp><span class="samp">short</span></samp>&rsquo; for 32 bit pointers, &lsquo;<samp><span class="samp">64</span></samp>&rsquo; or &lsquo;<samp><span class="samp">long</span></samp>&rsquo;
for 64 bit pointers, and &lsquo;<samp><span class="samp">no</span></samp>&rsquo; for supporting only 32 bit pointers.
The later option disables <code>pragma pointer_size</code>.
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