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<h4 class="subsection">6.54.5 Darwin Pragmas</h4>

<p>The following pragmas are available for all architectures running the
Darwin operating system.  These are useful for compatibility with other
Mac OS compilers.

     <dl>
<dt><code>mark </code><var>tokens</var><code>...</code><dd><a name="index-pragma_002c-mark-3130"></a>This pragma is accepted, but has no effect.

     <br><dt><code>options align=</code><var>alignment</var><dd><a name="index-pragma_002c-options-align-3131"></a>This pragma sets the alignment of fields in structures.  The values of
<var>alignment</var> may be <code>mac68k</code>, to emulate m68k alignment, or
<code>power</code>, to emulate PowerPC alignment.  Uses of this pragma nest
properly; to restore the previous setting, use <code>reset</code> for the
<var>alignment</var>.

     <br><dt><code>segment </code><var>tokens</var><code>...</code><dd><a name="index-pragma_002c-segment-3132"></a>This pragma is accepted, but has no effect.

     <br><dt><code>unused (</code><var>var</var><code> [, </code><var>var</var><code>]...)</code><dd><a name="index-pragma_002c-unused-3133"></a>This pragma declares variables to be possibly unused.  GCC will not
produce warnings for the listed variables.  The effect is similar to
that of the <code>unused</code> attribute, except that this pragma may appear
anywhere within the variables' scopes. 
</dl>

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