118 lines
4.8 KiB
HTML
118 lines
4.8 KiB
HTML
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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) 1988-2016 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 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using the GNU Compiler Collection (GCC): Darwin Pragmas</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): Darwin Pragmas">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Darwin Pragmas">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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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="Solaris-Pragmas.html#Solaris-Pragmas" rel="next" title="Solaris Pragmas">
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<link href="S_002f390-Pragmas.html#S_002f390-Pragmas" rel="prev" title="S/390 Pragmas">
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Darwin-Pragmas"></a>
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<div class="header">
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<p>
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Next: <a href="Solaris-Pragmas.html#Solaris-Pragmas" accesskey="n" rel="next">Solaris Pragmas</a>, Previous: <a href="S_002f390-Pragmas.html#S_002f390-Pragmas" accesskey="p" rel="prev">S/390 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="Darwin-Pragmas-1"></a>
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<h4 class="subsection">6.61.7 Darwin Pragmas</h4>
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<p>The following pragmas are available for all architectures running the
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Darwin operating system. These are useful for compatibility with other
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Mac OS compilers.
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</p>
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<dl compact="compact">
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<dt><code>mark <var>tokens</var>…</code></dt>
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<dd><a name="index-pragma_002c-mark"></a>
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<p>This pragma is accepted, but has no effect.
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</p>
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</dd>
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<dt><code>options align=<var>alignment</var></code></dt>
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<dd><a name="index-pragma_002c-options-align"></a>
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<p>This pragma sets the alignment of fields in structures. The values of
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<var>alignment</var> may be <code>mac68k</code>, to emulate m68k alignment, or
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<code>power</code>, to emulate PowerPC alignment. Uses of this pragma nest
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properly; to restore the previous setting, use <code>reset</code> for the
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<var>alignment</var>.
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</p>
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</dd>
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<dt><code>segment <var>tokens</var>…</code></dt>
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<dd><a name="index-pragma_002c-segment"></a>
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<p>This pragma is accepted, but has no effect.
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</p>
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</dd>
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<dt><code>unused (<var>var</var> [, <var>var</var>]…)</code></dt>
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<dd><a name="index-pragma_002c-unused"></a>
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<p>This pragma declares variables to be possibly unused. GCC does not
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produce warnings for the listed variables. The effect is similar to
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that of the <code>unused</code> attribute, except that this pragma may appear
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anywhere within the variables’ scopes.
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</p></dd>
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</dl>
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</body>
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</html>
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