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121 lines
5.2 KiB
HTML
121 lines
5.2 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Symbol-Renaming Pragmas (Using the GNU Compiler Collection (GCC))</title>
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<meta name="description" content="Symbol-Renaming Pragmas (Using the GNU Compiler Collection (GCC))">
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<meta name="keywords" content="Symbol-Renaming Pragmas (Using the GNU Compiler Collection (GCC))">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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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="Structure_002dLayout-Pragmas.html#Structure_002dLayout-Pragmas" rel="next" title="Structure-Layout Pragmas">
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<link href="Solaris-Pragmas.html#Solaris-Pragmas" rel="prev" title="Solaris Pragmas">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Symbol_002dRenaming-Pragmas"></a>
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<div class="header">
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<p>
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Next: <a href="Structure_002dLayout-Pragmas.html#Structure_002dLayout-Pragmas" accesskey="n" rel="next">Structure-Layout Pragmas</a>, Previous: <a href="Solaris-Pragmas.html#Solaris-Pragmas" accesskey="p" rel="prev">Solaris 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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</div>
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<hr>
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<a name="Symbol_002dRenaming-Pragmas-1"></a>
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<h4 class="subsection">6.61.9 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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</p>
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<dl compact="compact">
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<dt><code>redefine_extname <var>oldname</var> <var>newname</var></code></dt>
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<dd><a name="index-pragma_002c-redefine_005fextname"></a>
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<p>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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</p></dd>
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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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</p>
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<ol>
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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><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><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><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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</li></ol>
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</body>
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</html>
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