118 lines
4.9 KiB
HTML
118 lines
4.9 KiB
HTML
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<head>
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<title>Using the GNU Compiler Collection (GCC): Push/Pop Macro Pragmas</title>
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Pragmas.html#Pragmas" rel="up" title="Pragmas">
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<link href="Function-Specific-Option-Pragmas.html#Function-Specific-Option-Pragmas" rel="next" title="Function Specific Option Pragmas">
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<a name="Push_002fPop-Macro-Pragmas"></a>
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<div class="header">
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<p>
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Next: <a href="Function-Specific-Option-Pragmas.html#Function-Specific-Option-Pragmas" accesskey="n" rel="next">Function Specific Option Pragmas</a>, Previous: <a href="Visibility-Pragmas.html#Visibility-Pragmas" accesskey="p" rel="prev">Visibility Pragmas</a>, Up: <a href="Pragmas.html#Pragmas" accesskey="u" rel="up">Pragmas</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Push_002fPop-Macro-Pragmas-1"></a>
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<h4 class="subsection">6.61.14 Push/Pop Macro Pragmas</h4>
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<p>For compatibility with Microsoft Windows compilers, GCC supports
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‘<samp>#pragma push_macro(<var>"macro_name"</var>)</samp>’
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and ‘<samp>#pragma pop_macro(<var>"macro_name"</var>)</samp>’.
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</p>
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<dl compact="compact">
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<dt><code>#pragma push_macro(<var>"macro_name"</var>)</code></dt>
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<dd><a name="index-pragma_002c-push_005fmacro"></a>
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<p>This pragma saves the value of the macro named as <var>macro_name</var> to
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the top of the stack for this macro.
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</p>
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</dd>
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<dt><code>#pragma pop_macro(<var>"macro_name"</var>)</code></dt>
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<dd><a name="index-pragma_002c-pop_005fmacro"></a>
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<p>This pragma sets the value of the macro named as <var>macro_name</var> to
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the value on top of the stack for this macro. If the stack for
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<var>macro_name</var> is empty, the value of the macro remains unchanged.
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</p></dd>
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</dl>
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<p>For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">#define X 1
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#pragma push_macro("X")
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#undef X
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#define X -1
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#pragma pop_macro("X")
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int x [X];
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</pre></div>
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<p>In this example, the definition of X as 1 is saved by <code>#pragma
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push_macro</code> and restored by <code>#pragma pop_macro</code>.
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</p>
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