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| <h4 class="subsection">6.54.12 Push/Pop Macro Pragmas</h4> |
| |
| <p>For compatibility with Microsoft Windows compilers, GCC supports |
| ‘<samp><span class="samp">#pragma push_macro(</span><var>"macro_name"</var><span class="samp">)</span></samp>’ |
| and ‘<samp><span class="samp">#pragma pop_macro(</span><var>"macro_name"</var><span class="samp">)</span></samp>’. |
| |
| <dl> |
| <dt><code>#pragma push_macro(</code><var>"macro_name"</var><code>)</code><dd><a name="index-pragma_002c-push_005fmacro-3143"></a>This pragma saves the value of the macro named as <var>macro_name</var> to |
| the top of the stack for this macro. |
| |
| <br><dt><code>#pragma pop_macro(</code><var>"macro_name"</var><code>)</code><dd><a name="index-pragma_002c-pop_005fmacro-3144"></a>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. |
| </dl> |
| |
| <p>For example: |
| |
| <pre class="smallexample"> #define X 1 |
| #pragma push_macro("X") |
| #undef X |
| #define X -1 |
| #pragma pop_macro("X") |
| int x [X]; |
| </pre> |
| <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>. |
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