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94 lines
4.1 KiB
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94 lines
4.1 KiB
HTML
4 years ago
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<title>Symbol-Renaming Pragmas - Using the GNU Compiler Collection (GCC)</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC)">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Pragmas.html#Pragmas" title="Pragmas">
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<link rel="prev" href="Solaris-Pragmas.html#Solaris-Pragmas" title="Solaris Pragmas">
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<link rel="next" href="Structure_002dPacking-Pragmas.html#Structure_002dPacking-Pragmas" title="Structure-Packing 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) The FSF's Front-Cover Text is:
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A GNU Manual
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</head>
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<body>
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<div class="node">
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<a name="Symbol-Renaming-Pragmas"></a>
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<a name="Symbol_002dRenaming-Pragmas"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Structure_002dPacking-Pragmas.html#Structure_002dPacking-Pragmas">Structure-Packing Pragmas</a>,
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Previous: <a rel="previous" accesskey="p" href="Solaris-Pragmas.html#Solaris-Pragmas">Solaris 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">6.60.7 Symbol-Renaming Pragmas</h4>
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<p>GCC supports a <code>#pragma</code> directive that changes the name used in
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assembly for a given declaration. While this pragma is supported on all
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platforms, it is intended primarily to provide compatibility with the
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Solaris system headers. This effect can also be achieved using the asm
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labels extension (see <a href="Asm-Labels.html#Asm-Labels">Asm Labels</a>).
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<dl>
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<dt><code>redefine_extname </code><var>oldname</var> <var>newname</var><dd><a name="index-pragma_002c-redefine_005fextname-4176"></a>
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This pragma gives the C function <var>oldname</var> the assembly symbol
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<var>newname</var>. The preprocessor macro <code>__PRAGMA_REDEFINE_EXTNAME</code>
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is defined if this pragma is available (currently on all platforms).
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</dl>
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<p>This pragma and the asm labels extension interact in a complicated
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manner. Here are some corner cases you may want to be aware of:
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<ol type=1 start=1>
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<li>This pragma silently applies only to declarations with external
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linkage. Asm labels do not have this restriction.
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<li>In C++, this pragma silently applies only to declarations with
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“C” linkage. Again, asm labels do not have this restriction.
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<li>If either of the ways of changing the assembly name of a
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declaration are applied to a declaration whose assembly name has
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already been determined (either by a previous use of one of these
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features, or because the compiler needed the assembly name in order to
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generate code), and the new name is different, a warning issues and
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the name does not change.
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<li>The <var>oldname</var> used by <code>#pragma redefine_extname</code> is
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always the C-language name.
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</ol>
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</body></html>
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