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<a name="Darwin-Pragmas-1"></a>
<h4 class="subsection">6.62.8 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.
</p>
<dl compact="compact">
<dt><code>mark <var>tokens</var>&hellip;</code></dt>
<dd><a name="index-pragma_002c-mark"></a>
<p>This pragma is accepted, but has no effect.
</p>
</dd>
<dt><code>options align=<var>alignment</var></code></dt>
<dd><a name="index-pragma_002c-options-align"></a>
<p>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>.
</p>
</dd>
<dt><code>segment <var>tokens</var>&hellip;</code></dt>
<dd><a name="index-pragma_002c-segment"></a>
<p>This pragma is accepted, but has no effect.
</p>
</dd>
<dt><code>unused (<var>var</var> [, <var>var</var>]&hellip;)</code></dt>
<dd><a name="index-pragma_002c-unused"></a>
<p>This pragma declares variables to be possibly unused.  GCC does 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&rsquo; scopes.
</p></dd>
</dl>


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