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74 lines
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74 lines
3.2 KiB
HTML
4 years ago
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<title>Weak Pragmas - Using the GNU Compiler Collection (GCC)</title>
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<link rel="up" href="Pragmas.html#Pragmas" title="Pragmas">
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<link rel="prev" href="Structure_002dPacking-Pragmas.html#Structure_002dPacking-Pragmas" title="Structure-Packing Pragmas">
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<link rel="next" href="Diagnostic-Pragmas.html#Diagnostic-Pragmas" title="Diagnostic Pragmas">
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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A GNU Manual
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<div class="node">
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<a name="Weak-Pragmas"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Diagnostic-Pragmas.html#Diagnostic-Pragmas">Diagnostic Pragmas</a>,
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Previous: <a rel="previous" accesskey="p" href="Structure_002dPacking-Pragmas.html#Structure_002dPacking-Pragmas">Structure-Packing Pragmas</a>,
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Up: <a rel="up" accesskey="u" href="Pragmas.html#Pragmas">Pragmas</a>
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<hr>
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</div>
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<h4 class="subsection">6.60.9 Weak Pragmas</h4>
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<p>For compatibility with SVR4, GCC supports a set of <code>#pragma</code>
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directives for declaring symbols to be weak, and defining weak
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aliases.
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<dl>
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<dt><code>#pragma weak </code><var>symbol</var><dd><a name="index-pragma_002c-weak-4177"></a>This pragma declares <var>symbol</var> to be weak, as if the declaration
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had the attribute of the same name. The pragma may appear before
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or after the declaration of <var>symbol</var>. It is not an error for
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<var>symbol</var> to never be defined at all.
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<br><dt><code>#pragma weak </code><var>symbol1</var><code> = </code><var>symbol2</var><dd>This pragma declares <var>symbol1</var> to be a weak alias of <var>symbol2</var>.
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It is an error if <var>symbol2</var> is not defined in the current
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translation unit.
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</dl>
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</body></html>
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