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<title>Push/Pop Macro Pragmas (Using the GNU Compiler Collection (GCC))</title>

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<a name="Push_002fPop-Macro-Pragmas-1"></a>
<h4 class="subsection">6.62.15 Push/Pop Macro Pragmas</h4>

<p>For compatibility with Microsoft Windows compilers, GCC supports
&lsquo;<samp>#pragma push_macro(<var>&quot;macro_name&quot;</var>)</samp>&rsquo;
and &lsquo;<samp>#pragma pop_macro(<var>&quot;macro_name&quot;</var>)</samp>&rsquo;.
</p>
<dl compact="compact">
<dt><code>#pragma push_macro(<var>&quot;macro_name&quot;</var>)</code></dt>
<dd><a name="index-pragma_002c-push_005fmacro"></a>
<p>This pragma saves the value of the macro named as <var>macro_name</var> to
the top of the stack for this macro.
</p>
</dd>
<dt><code>#pragma pop_macro(<var>&quot;macro_name&quot;</var>)</code></dt>
<dd><a name="index-pragma_002c-pop_005fmacro"></a>
<p>This pragma sets the value of the macro named as <var>macro_name</var> to
the value on top of the stack for this macro. If the stack for
<var>macro_name</var> is empty, the value of the macro remains unchanged.
</p></dd>
</dl>

<p>For example:
</p>
<div class="smallexample">
<pre class="smallexample">#define X  1
#pragma push_macro(&quot;X&quot;)
#undef X
#define X -1
#pragma pop_macro(&quot;X&quot;)
int x [X];
</pre></div>

<p>In this example, the definition of X as 1 is saved by <code>#pragma
push_macro</code> and restored by <code>#pragma pop_macro</code>.
</p>


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